X-Git-Url: https://git.pterodactylus.net/?a=blobdiff_plain;f=libs%2Fsqlite3%2Fsqlite3.h;h=9630d9e715673c18fee480173baa1888d1cec4cb;hb=b7f3b3e6ae9dc527f02b5c06e2eeae0e9cac3ad8;hp=955dea0a1f695b67aaf74e407bba8725cbe8d698;hpb=6b896a9e1dc143bba86795be1e9336549db9b85f;p=fms.git diff --git a/libs/sqlite3/sqlite3.h b/libs/sqlite3/sqlite3.h index 955dea0..9630d9e 100644 --- a/libs/sqlite3/sqlite3.h +++ b/libs/sqlite3/sqlite3.h @@ -17,7 +17,7 @@ ** ** Some of the definitions that are in this file are marked as ** "experimental". Experimental interfaces are normally new -** features recently added to SQLite. We do not anticipate changes +** features recently added to SQLite. We do not anticipate changes ** to experimental interfaces but reserve to make minor changes if ** experience from use "in the wild" suggest such changes are prudent. ** @@ -30,7 +30,7 @@ ** the version number) and changes its name to "sqlite3.h" as ** part of the build process. ** -** @(#) $Id: sqlite.h.in,v 1.278 2007/12/13 21:54:11 drh Exp $ +** @(#) $Id: sqlite.h.in,v 1.387 2008/08/05 17:53:23 drh Exp $ */ #ifndef _SQLITE3_H_ #define _SQLITE3_H_ @@ -52,8 +52,7 @@ extern "C" { #endif /* -** Make sure these symbols where not defined by some previous header -** file. +** Ensure these symbols were not defined by some previous header file. */ #ifdef SQLITE_VERSION # undef SQLITE_VERSION @@ -63,106 +62,145 @@ extern "C" { #endif /* -** CAPI3REF: Compile-Time Library Version Numbers {F10010} +** CAPI3REF: Compile-Time Library Version Numbers {H10010} +** +** The SQLITE_VERSION and SQLITE_VERSION_NUMBER #defines in +** the sqlite3.h file specify the version of SQLite with which +** that header file is associated. +** +** The "version" of SQLite is a string of the form "X.Y.Z". +** The phrase "alpha" or "beta" might be appended after the Z. +** The X value is major version number always 3 in SQLite3. +** The X value only changes when backwards compatibility is +** broken and we intend to never break backwards compatibility. +** The Y value is the minor version number and only changes when +** there are major feature enhancements that are forwards compatible +** but not backwards compatible. +** The Z value is the release number and is incremented with +** each release but resets back to 0 whenever Y is incremented. ** -** {F10011} The #define in the sqlite3.h header file named -** SQLITE_VERSION resolves to a string literal that identifies -** the version of the SQLite library in the format "X.Y.Z", where -** X is the major version number, Y is the minor version number and Z -** is the release number. The X.Y.Z might be followed by "alpha" or "beta". -** {END} For example "3.1.1beta". +** See also: [sqlite3_libversion()] and [sqlite3_libversion_number()]. ** -** The X value is always 3 in SQLite. The X value only changes when -** backwards compatibility is broken and we intend to never break -** backwards compatibility. The Y value only changes when -** there are major feature enhancements that are forwards compatible -** but not backwards compatible. The Z value is incremented with -** each release but resets back to 0 when Y is incremented. +** INVARIANTS: ** -** {F10014} The SQLITE_VERSION_NUMBER #define resolves to an integer -** with the value (X*1000000 + Y*1000 + Z) where X, Y, and Z are as -** with SQLITE_VERSION. {END} For example, for version "3.1.1beta", -** SQLITE_VERSION_NUMBER is set to 3001001. To detect if they are using -** version 3.1.1 or greater at compile time, programs may use the test -** (SQLITE_VERSION_NUMBER>=3001001). +** {H10011} The SQLITE_VERSION #define in the sqlite3.h header file shall +** evaluate to a string literal that is the SQLite version +** with which the header file is associated. ** -** See also: [sqlite3_libversion()] and [sqlite3_libversion_number()]. +** {H10014} The SQLITE_VERSION_NUMBER #define shall resolve to an integer +** with the value (X*1000000 + Y*1000 + Z) where X, Y, and Z +** are the major version, minor version, and release number. */ -#define SQLITE_VERSION "3.5.4" -#define SQLITE_VERSION_NUMBER 3005004 +#define SQLITE_VERSION "3.6.1" +#define SQLITE_VERSION_NUMBER 3006001 /* -** CAPI3REF: Run-Time Library Version Numbers {F10020} -** -** {F10021} The sqlite3_libversion_number() interface returns an integer -** equal to [SQLITE_VERSION_NUMBER]. {END} The value returned -** by this routine should only be different from the header values -** if the application is compiled using an sqlite3.h header from a -** different version of SQLite than library. Cautious programmers might -** include a check in their application to verify that -** sqlite3_libversion_number() always returns the value +** CAPI3REF: Run-Time Library Version Numbers {H10020} +** KEYWORDS: sqlite3_version +** +** These features provide the same information as the [SQLITE_VERSION] +** and [SQLITE_VERSION_NUMBER] #defines in the header, but are associated +** with the library instead of the header file. Cautious programmers might +** include a check in their application to verify that +** sqlite3_libversion_number() always returns the value ** [SQLITE_VERSION_NUMBER]. ** -** {F10022} The sqlite3_version[] string constant contains the text of the -** [SQLITE_VERSION] string. {F10023} The sqlite3_libversion() function returns -** a pointer to the sqlite3_version[] string constant. {END} The -** sqlite3_libversion() function -** is provided for DLL users who can only access functions and not +** The sqlite3_libversion() function returns the same information as is +** in the sqlite3_version[] string constant. The function is provided +** for use in DLLs since DLL users usually do not have direct access to string ** constants within the DLL. +** +** INVARIANTS: +** +** {H10021} The [sqlite3_libversion_number()] interface shall return +** an integer equal to [SQLITE_VERSION_NUMBER]. +** +** {H10022} The [sqlite3_version] string constant shall contain +** the text of the [SQLITE_VERSION] string. +** +** {H10023} The [sqlite3_libversion()] function shall return +** a pointer to the [sqlite3_version] string constant. */ SQLITE_EXTERN const char sqlite3_version[]; const char *sqlite3_libversion(void); int sqlite3_libversion_number(void); /* -** CAPI3REF: Test To See If The Library Is Threadsafe {F10100} -** -** {F10101} The sqlite3_threadsafe() routine returns nonzero -** if SQLite was compiled with its mutexes enabled or zero if -** SQLite was compiled with mutexes disabled. {END} If this -** routine returns false, then it is not safe for simultaneously -** running threads to both invoke SQLite interfaces. -** -** Really all this routine does is return true if SQLite was -** compiled with the -DSQLITE_THREADSAFE=1 option and false if -** compiled with -DSQLITE_THREADSAFE=0. If SQLite uses an -** application-defined mutex subsystem, malloc subsystem, collating -** sequence, VFS, SQL function, progress callback, commit hook, -** extension, or other accessories and these add-ons are not -** threadsafe, then clearly the combination will not be threadsafe -** either. Hence, this routine never reports that the library -** is guaranteed to be threadsafe, only when it is guaranteed not -** to be. +** CAPI3REF: Test To See If The Library Is Threadsafe {H10100} +** +** SQLite can be compiled with or without mutexes. When +** the [SQLITE_THREADSAFE] C preprocessor macro is true, mutexes +** are enabled and SQLite is threadsafe. When that macro is false, +** the mutexes are omitted. Without the mutexes, it is not safe +** to use SQLite concurrently from more than one thread. +** +** Enabling mutexes incurs a measurable performance penalty. +** So if speed is of utmost importance, it makes sense to disable +** the mutexes. But for maximum safety, mutexes should be enabled. +** The default behavior is for mutexes to be enabled. +** +** This interface can be used by a program to make sure that the +** version of SQLite that it is linking against was compiled with +** the desired setting of the [SQLITE_THREADSAFE] macro. +** +** This interface only reports on the compile-time mutex setting +** of the [SQLITE_THREADSAFE] flag. If SQLite is compiled with +** SQLITE_THREADSAFE=1 then mutexes are enabled by default but +** can be fully or partially disabled using a call to [sqlite3_config()] +** with the verbs [SQLITE_CONFIG_SINGLETHREAD], [SQLITE_CONFIG_MULTITHREAD], +** or [SQLITE_CONFIG_MUTEX]. The return value of this function shows +** only the default compile-time setting, not any run-time changes +** to that setting. +** +** INVARIANTS: +** +** {H10101} The [sqlite3_threadsafe()] function shall return nonzero if +** SQLite was compiled with the its mutexes enabled by default +** or zero if SQLite was compiled such that mutexes are +** permanently disabled. +** +** {H10102} The value returned by the [sqlite3_threadsafe()] function +** shall not change when mutex setting are modified at +** runtime using the [sqlite3_config()] interface and +** especially the [SQLITE_CONFIG_SINGLETHREAD], +** [SQLITE_CONFIG_MULTITHREAD], [SQLITE_CONFIG_SERIALIZED], +** and [SQLITE_CONFIG_MUTEX] verbs. */ int sqlite3_threadsafe(void); /* -** CAPI3REF: Database Connection Handle {F12000} +** CAPI3REF: Database Connection Handle {H12000} +** KEYWORDS: {database connection} {database connections} ** -** Each open SQLite database is represented by pointer to an instance of the -** opaque structure named "sqlite3". It is useful to think of an sqlite3 +** Each open SQLite database is represented by a pointer to an instance of +** the opaque structure named "sqlite3". It is useful to think of an sqlite3 ** pointer as an object. The [sqlite3_open()], [sqlite3_open16()], and -** [sqlite3_open_v2()] interfaces are its constructors -** and [sqlite3_close()] is its destructor. There are many other interfaces -** (such as [sqlite3_prepare_v2()], [sqlite3_create_function()], and -** [sqlite3_busy_timeout()] to name but three) that are methods on this -** object. +** [sqlite3_open_v2()] interfaces are its constructors, and [sqlite3_close()] +** is its destructor. There are many other interfaces (such as +** [sqlite3_prepare_v2()], [sqlite3_create_function()], and +** [sqlite3_busy_timeout()] to name but three) that are methods on an +** sqlite3 object. */ typedef struct sqlite3 sqlite3; - /* -** CAPI3REF: 64-Bit Integer Types {F10200} +** CAPI3REF: 64-Bit Integer Types {H10200} +** KEYWORDS: sqlite_int64 sqlite_uint64 ** -** Because there is no cross-platform way to specify such types +** Because there is no cross-platform way to specify 64-bit integer types ** SQLite includes typedefs for 64-bit signed and unsigned integers. -** {F10201} The sqlite_int64 and sqlite3_int64 types specify a -** 64-bit signed integer. {F10202} The sqlite_uint64 and -** sqlite3_uint64 types specify a 64-bit unsigned integer. {END} ** -** The sqlite3_int64 and sqlite3_uint64 are the preferred type -** definitions. The sqlite_int64 and sqlite_uint64 types are -** supported for backwards compatibility only. +** The sqlite3_int64 and sqlite3_uint64 are the preferred type definitions. +** The sqlite_int64 and sqlite_uint64 types are supported for backwards +** compatibility only. +** +** INVARIANTS: +** +** {H10201} The [sqlite_int64] and [sqlite3_int64] type shall specify +** a 64-bit signed integer. +** +** {H10202} The [sqlite_uint64] and [sqlite3_uint64] type shall specify +** a 64-bit unsigned integer. */ #ifdef SQLITE_INT64_TYPE typedef SQLITE_INT64_TYPE sqlite_int64; @@ -179,31 +217,62 @@ typedef sqlite_uint64 sqlite3_uint64; /* ** If compiling for a processor that lacks floating point support, -** substitute integer for floating-point +** substitute integer for floating-point. */ #ifdef SQLITE_OMIT_FLOATING_POINT # define double sqlite3_int64 #endif /* -** CAPI3REF: Closing A Database Connection {F12010} +** CAPI3REF: Closing A Database Connection {H12010} +** +** This routine is the destructor for the [sqlite3] object. ** -** {F12011} The sqlite3_close() interfaces destroys an [sqlite3] object -** allocated by a prior call to [sqlite3_open()], [sqlite3_open16()], or -** [sqlite3_open_v2()]. {F12012} Sqlite3_close() releases all -** memory used by the connection and closes all open files. {END}. +** Applications should [sqlite3_finalize | finalize] all [prepared statements] +** and [sqlite3_blob_close | close] all [BLOB handles] associated with +** the [sqlite3] object prior to attempting to close the object. +** The [sqlite3_next_stmt()] interface can be used to locate all +** [prepared statements] associated with a [database connection] if desired. +** Typical code might look like this: ** -** {F12013} If the database connection contains -** [sqlite3_stmt | prepared statements] that have not been finalized -** by [sqlite3_finalize()], then sqlite3_close() returns SQLITE_BUSY -** and leaves the connection open. {F12014} Giving sqlite3_close() -** a NULL pointer is a harmless no-op. {END} +** 
+** sqlite3_stmt *pStmt;
+** while( (pStmt = sqlite3_next_stmt(db, 0))!=0 ){
+**     sqlite3_finalize(pStmt);
+** }
+**
** -** {U12015} Passing this routine a database connection that has already been -** closed results in undefined behavior. {U12016} If other interfaces that -** reference the same database connection are pending (either in the -** same thread or in different threads) when this routine is called, -** then the behavior is undefined and is almost certainly undesirable. +** If [sqlite3_close()] is invoked while a transaction is open, +** the transaction is automatically rolled back. +** +** INVARIANTS: +** +** {H12011} A successful call to [sqlite3_close(C)] shall destroy the +** [database connection] object C. +** +** {H12012} A successful call to [sqlite3_close(C)] shall return SQLITE_OK. +** +** {H12013} A successful call to [sqlite3_close(C)] shall release all +** memory and system resources associated with [database connection] +** C. +** +** {H12014} A call to [sqlite3_close(C)] on a [database connection] C that +** has one or more open [prepared statements] shall fail with +** an [SQLITE_BUSY] error code. +** +** {H12015} A call to [sqlite3_close(C)] where C is a NULL pointer shall +** return SQLITE_OK. +** +** {H12019} When [sqlite3_close(C)] is invoked on a [database connection] C +** that has a pending transaction, the transaction shall be +** rolled back. +** +** ASSUMPTIONS: +** +** {A12016} The C parameter to [sqlite3_close(C)] must be either a NULL +** pointer or an [sqlite3] object pointer obtained +** from [sqlite3_open()], [sqlite3_open16()], or +** [sqlite3_open_v2()], and not previously closed. */ int sqlite3_close(sqlite3 *); @@ -215,85 +284,130 @@ int sqlite3_close(sqlite3 *); typedef int (*sqlite3_callback)(void*,int,char**, char**); /* -** CAPI3REF: One-Step Query Execution Interface {F12100} -** -** {F12101} The sqlite3_exec() interface evaluates zero or more -** UTF-8 encoded, semicolon-separated SQL statements in the zero-terminated -** string of its second argument. {F12102} The SQL -** statements are evaluated in the context of the database connection -** specified by in the first argument. -** {F12103} SQL statements are prepared one by one using -** [sqlite3_prepare()] or the equivalent, evaluated -** using one or more calls to [sqlite3_step()], then destroyed -** using [sqlite3_finalize()]. {F12104} The return value of -** sqlite3_exec() is SQLITE_OK if all SQL statement run -** successfully. -** -** {F12105} If one or more of the SQL statements handed to -** sqlite3_exec() are queries, then -** the callback function specified by the 3rd parameter is -** invoked once for each row of the query result. {F12106} -** If the callback returns a non-zero value then the query -** is aborted, all subsequent SQL statements -** are skipped and the sqlite3_exec() function returns the [SQLITE_ABORT]. -** -** {F12107} The 4th parameter to sqlite3_exec() is an arbitrary pointer -** that is passed through to the callback function as its first parameter. -** -** {F12108} The 2nd parameter to the callback function is the number of -** columns in the query result. {F12109} The 3rd parameter to the callback -** is an array of pointers to strings holding the values for each column -** as extracted using [sqlite3_column_text()]. NULL values in the result -** set result in a NULL pointer. All other value are in their UTF-8 -** string representation. {F12117} -** The 4th parameter to the callback is an array of strings -** obtained using [sqlite3_column_name()] and holding -** the names of each column, also in UTF-8. -** -** {F12110} The callback function may be NULL, even for queries. A NULL -** callback is not an error. It just means that no callback -** will be invoked. -** -** {F12112} If an error occurs while parsing or evaluating the SQL -** then an appropriate error message is written into memory obtained -** from [sqlite3_malloc()] and *errmsg is made to point to that message -** assuming errmsg is not NULL. -** {U12113} The calling function is responsible for freeing the memory -** using [sqlite3_free()]. -** {F12116} If [sqlite3_malloc()] fails while attempting to generate -** the error message, *errmsg is set to NULL. -** {F12114} If errmsg is NULL then no attempt is made to generate an -** error message. Is the return code SQLITE_NOMEM or the original -** error code? What happens if there are multiple errors? -** Do we get code for the first error, or is the choice of reported -** error arbitrary? -** -** {F12115} The return value is is SQLITE_OK if there are no errors and -** some other [SQLITE_OK | return code] if there is an error. -** The particular return value depends on the type of error. {END} +** CAPI3REF: One-Step Query Execution Interface {H12100} +** +** The sqlite3_exec() interface is a convenient way of running one or more +** SQL statements without having to write a lot of C code. The UTF-8 encoded +** SQL statements are passed in as the second parameter to sqlite3_exec(). +** The statements are evaluated one by one until either an error or +** an interrupt is encountered, or until they are all done. The 3rd parameter +** is an optional callback that is invoked once for each row of any query +** results produced by the SQL statements. The 5th parameter tells where +** to write any error messages. +** +** The error message passed back through the 5th parameter is held +** in memory obtained from [sqlite3_malloc()]. To avoid a memory leak, +** the calling application should call [sqlite3_free()] on any error +** message returned through the 5th parameter when it has finished using +** the error message. +** +** If the SQL statement in the 2nd parameter is NULL or an empty string +** or a string containing only whitespace and comments, then no SQL +** statements are evaluated and the database is not changed. +** +** The sqlite3_exec() interface is implemented in terms of +** [sqlite3_prepare_v2()], [sqlite3_step()], and [sqlite3_finalize()]. +** The sqlite3_exec() routine does nothing to the database that cannot be done +** by [sqlite3_prepare_v2()], [sqlite3_step()], and [sqlite3_finalize()]. +** +** INVARIANTS: +** +** {H12101} A successful invocation of [sqlite3_exec(D,S,C,A,E)] +** shall sequentially evaluate all of the UTF-8 encoded, +** semicolon-separated SQL statements in the zero-terminated +** string S within the context of the [database connection] D. +** +** {H12102} If the S parameter to [sqlite3_exec(D,S,C,A,E)] is NULL then +** the actions of the interface shall be the same as if the +** S parameter were an empty string. +** +** {H12104} The return value of [sqlite3_exec()] shall be [SQLITE_OK] if all +** SQL statements run successfully and to completion. +** +** {H12105} The return value of [sqlite3_exec()] shall be an appropriate +** non-zero [error code] if any SQL statement fails. +** +** {H12107} If one or more of the SQL statements handed to [sqlite3_exec()] +** return results and the 3rd parameter is not NULL, then +** the callback function specified by the 3rd parameter shall be +** invoked once for each row of result. +** +** {H12110} If the callback returns a non-zero value then [sqlite3_exec()] +** shall abort the SQL statement it is currently evaluating, +** skip all subsequent SQL statements, and return [SQLITE_ABORT]. +** +** {H12113} The [sqlite3_exec()] routine shall pass its 4th parameter through +** as the 1st parameter of the callback. +** +** {H12116} The [sqlite3_exec()] routine shall set the 2nd parameter of its +** callback to be the number of columns in the current row of +** result. +** +** {H12119} The [sqlite3_exec()] routine shall set the 3rd parameter of its +** callback to be an array of pointers to strings holding the +** values for each column in the current result set row as +** obtained from [sqlite3_column_text()]. +** +** {H12122} The [sqlite3_exec()] routine shall set the 4th parameter of its +** callback to be an array of pointers to strings holding the +** names of result columns as obtained from [sqlite3_column_name()]. +** +** {H12125} If the 3rd parameter to [sqlite3_exec()] is NULL then +** [sqlite3_exec()] shall silently discard query results. +** +** {H12131} If an error occurs while parsing or evaluating any of the SQL +** statements in the S parameter of [sqlite3_exec(D,S,C,A,E)] and if +** the E parameter is not NULL, then [sqlite3_exec()] shall store +** in *E an appropriate error message written into memory obtained +** from [sqlite3_malloc()]. +** +** {H12134} The [sqlite3_exec(D,S,C,A,E)] routine shall set the value of +** *E to NULL if E is not NULL and there are no errors. +** +** {H12137} The [sqlite3_exec(D,S,C,A,E)] function shall set the [error code] +** and message accessible via [sqlite3_errcode()], +** [sqlite3_errmsg()], and [sqlite3_errmsg16()]. +** +** {H12138} If the S parameter to [sqlite3_exec(D,S,C,A,E)] is NULL or an +** empty string or contains nothing other than whitespace, comments, +** and/or semicolons, then results of [sqlite3_errcode()], +** [sqlite3_errmsg()], and [sqlite3_errmsg16()] +** shall reset to indicate no errors. +** +** ASSUMPTIONS: +** +** {A12141} The first parameter to [sqlite3_exec()] must be an valid and open +** [database connection]. +** +** {A12142} The database connection must not be closed while +** [sqlite3_exec()] is running. +** +** {A12143} The calling function should use [sqlite3_free()] to free +** the memory that *errmsg is left pointing at once the error +** message is no longer needed. +** +** {A12145} The SQL statement text in the 2nd parameter to [sqlite3_exec()] +** must remain unchanged while [sqlite3_exec()] is running. */ int sqlite3_exec( sqlite3*, /* An open database */ - const char *sql, /* SQL to be evaluted */ + const char *sql, /* SQL to be evaluated */ int (*callback)(void*,int,char**,char**), /* Callback function */ void *, /* 1st argument to callback */ char **errmsg /* Error msg written here */ ); /* -** CAPI3REF: Result Codes {F10210} -** KEYWORDS: SQLITE_OK +** CAPI3REF: Result Codes {H10210} +** KEYWORDS: SQLITE_OK {error code} {error codes} +** KEYWORDS: {result code} {result codes} ** ** Many SQLite functions return an integer result code from the set shown -** above in order to indicates success or failure. +** here in order to indicates success or failure. ** -** {F10211} The result codes shown here are the only ones returned -** by SQLite in its default configuration. {F10212} However, the -** [sqlite3_extended_result_codes()] API can be used to set a database -** connectoin to return more detailed result codes. {END} +** New error codes may be added in future versions of SQLite. ** ** See also: [SQLITE_IOERR_READ | extended result codes] -** */ #define SQLITE_OK 0 /* Successful result */ /* beginning-of-error-codes */ @@ -328,52 +442,62 @@ int sqlite3_exec( /* end-of-error-codes */ /* -** CAPI3REF: Extended Result Codes {F10220} +** CAPI3REF: Extended Result Codes {H10220} +** KEYWORDS: {extended error code} {extended error codes} +** KEYWORDS: {extended result code} {extended result codes} ** ** In its default configuration, SQLite API routines return one of 26 integer -** [SQLITE_OK | result codes]. However, experience has shown that -** many of these result codes are too course-grained. They do not provide as +** [SQLITE_OK | result codes]. However, experience has shown that many of +** these result codes are too coarse-grained. They do not provide as ** much information about problems as programmers might like. In an effort to ** address this, newer versions of SQLite (version 3.3.8 and later) include ** support for additional result codes that provide more detailed information -** about errors. {F10221} The extended result codes are enabled or disabled -** for each database connection using the [sqlite3_extended_result_codes()] -** API. {END} -** -** Some of the available extended result codes are listed above. -** We expect the number of extended result codes will be expand -** over time. {U10422} Software that uses extended result codes should expect -** to see new result codes in future releases of SQLite. {END} -** -** {F10223} The symbolic name for an extended result code always contains -** a related primary result code as a prefix. {F10224} Primary result -** codes contain a single "_" character. {F10225} Extended result codes -** contain two or more "_" characters. {F10226} The numeric value of an -** extended result code can be converted to its -** corresponding primary result code by masking off the lower 8 bytes. {END} +** about errors. The extended result codes are enabled or disabled +** on a per database connection basis using the +** [sqlite3_extended_result_codes()] API. +** +** Some of the available extended result codes are listed here. +** One may expect the number of extended result codes will be expand +** over time. Software that uses extended result codes should expect +** to see new result codes in future releases of SQLite. ** ** The SQLITE_OK result code will never be extended. It will always ** be exactly zero. +** +** INVARIANTS: +** +** {H10223} The symbolic name for an extended result code shall contains +** a related primary result code as a prefix. +** +** {H10224} Primary result code names shall contain a single "_" character. +** +** {H10225} Extended result code names shall contain two or more "_" characters. +** +** {H10226} The numeric value of an extended result code shall contain the +** numeric value of its corresponding primary result code in +** its least significant 8 bits. */ -#define SQLITE_IOERR_READ (SQLITE_IOERR | (1<<8)) -#define SQLITE_IOERR_SHORT_READ (SQLITE_IOERR | (2<<8)) -#define SQLITE_IOERR_WRITE (SQLITE_IOERR | (3<<8)) -#define SQLITE_IOERR_FSYNC (SQLITE_IOERR | (4<<8)) -#define SQLITE_IOERR_DIR_FSYNC (SQLITE_IOERR | (5<<8)) -#define SQLITE_IOERR_TRUNCATE (SQLITE_IOERR | (6<<8)) -#define SQLITE_IOERR_FSTAT (SQLITE_IOERR | (7<<8)) -#define SQLITE_IOERR_UNLOCK (SQLITE_IOERR | (8<<8)) -#define SQLITE_IOERR_RDLOCK (SQLITE_IOERR | (9<<8)) -#define SQLITE_IOERR_DELETE (SQLITE_IOERR | (10<<8)) -#define SQLITE_IOERR_BLOCKED (SQLITE_IOERR | (11<<8)) -#define SQLITE_IOERR_NOMEM (SQLITE_IOERR | (12<<8)) - -/* -** CAPI3REF: Flags For File Open Operations {F10230} -** -** {F10231} Some combination of the these bit values are used as the -** third argument to the [sqlite3_open_v2()] interface and -** as fourth argument to the xOpen method of the +#define SQLITE_IOERR_READ (SQLITE_IOERR | (1<<8)) +#define SQLITE_IOERR_SHORT_READ (SQLITE_IOERR | (2<<8)) +#define SQLITE_IOERR_WRITE (SQLITE_IOERR | (3<<8)) +#define SQLITE_IOERR_FSYNC (SQLITE_IOERR | (4<<8)) +#define SQLITE_IOERR_DIR_FSYNC (SQLITE_IOERR | (5<<8)) +#define SQLITE_IOERR_TRUNCATE (SQLITE_IOERR | (6<<8)) +#define SQLITE_IOERR_FSTAT (SQLITE_IOERR | (7<<8)) +#define SQLITE_IOERR_UNLOCK (SQLITE_IOERR | (8<<8)) +#define SQLITE_IOERR_RDLOCK (SQLITE_IOERR | (9<<8)) +#define SQLITE_IOERR_DELETE (SQLITE_IOERR | (10<<8)) +#define SQLITE_IOERR_BLOCKED (SQLITE_IOERR | (11<<8)) +#define SQLITE_IOERR_NOMEM (SQLITE_IOERR | (12<<8)) +#define SQLITE_IOERR_ACCESS (SQLITE_IOERR | (13<<8)) +#define SQLITE_IOERR_CHECKRESERVEDLOCK (SQLITE_IOERR | (14<<8)) + +/* +** CAPI3REF: Flags For File Open Operations {H10230} +** +** These bit values are intended for use in the +** 3rd parameter to the [sqlite3_open_v2()] interface and +** in the 4th parameter to the xOpen method of the ** [sqlite3_vfs] object. */ #define SQLITE_OPEN_READONLY 0x00000001 @@ -388,24 +512,25 @@ int sqlite3_exec( #define SQLITE_OPEN_TEMP_JOURNAL 0x00001000 #define SQLITE_OPEN_SUBJOURNAL 0x00002000 #define SQLITE_OPEN_MASTER_JOURNAL 0x00004000 +#define SQLITE_OPEN_NOMUTEX 0x00008000 /* -** CAPI3REF: Device Characteristics {F10240} +** CAPI3REF: Device Characteristics {H10240} ** -** {F10241} The xDeviceCapabilities method of the [sqlite3_io_methods] +** The xDeviceCapabilities method of the [sqlite3_io_methods] ** object returns an integer which is a vector of the these ** bit values expressing I/O characteristics of the mass storage ** device that holds the file that the [sqlite3_io_methods] -** refers to. {END} +** refers to. ** -** {F10242} The SQLITE_IOCAP_ATOMIC property means that all writes of -** any size are atomic. {F10243} The SQLITE_IOCAP_ATOMICnnn values +** The SQLITE_IOCAP_ATOMIC property means that all writes of +** any size are atomic. The SQLITE_IOCAP_ATOMICnnn values ** mean that writes of blocks that are nnn bytes in size and ** are aligned to an address which is an integer multiple of -** nnn are atomic. {F10244} The SQLITE_IOCAP_SAFE_APPEND value means +** nnn are atomic. The SQLITE_IOCAP_SAFE_APPEND value means ** that when data is appended to a file, the data is appended ** first then the size of the file is extended, never the other -** way around. {F10245} The SQLITE_IOCAP_SEQUENTIAL property means that +** way around. The SQLITE_IOCAP_SEQUENTIAL property means that ** information is written to disk in the same order as calls ** to xWrite(). */ @@ -422,11 +547,11 @@ int sqlite3_exec( #define SQLITE_IOCAP_SEQUENTIAL 0x00000400 /* -** CAPI3REF: File Locking Levels {F10250} +** CAPI3REF: File Locking Levels {H10250} ** -** {F10251} SQLite uses one of the following integer values as the second +** SQLite uses one of these integer values as the second ** argument to calls it makes to the xLock() and xUnlock() methods -** of an [sqlite3_io_methods] object. {END} +** of an [sqlite3_io_methods] object. */ #define SQLITE_LOCK_NONE 0 #define SQLITE_LOCK_SHARED 1 @@ -435,25 +560,24 @@ int sqlite3_exec( #define SQLITE_LOCK_EXCLUSIVE 4 /* -** CAPI3REF: Synchronization Type Flags {F10260} +** CAPI3REF: Synchronization Type Flags {H10260} ** -** {F10261} When SQLite invokes the xSync() method of an -** [sqlite3_io_methods] object it uses a combination of the +** When SQLite invokes the xSync() method of an +** [sqlite3_io_methods] object it uses a combination of ** these integer values as the second argument. ** -** {F10262} When the SQLITE_SYNC_DATAONLY flag is used, it means that the +** When the SQLITE_SYNC_DATAONLY flag is used, it means that the ** sync operation only needs to flush data to mass storage. Inode -** information need not be flushed. {F10263} The SQLITE_SYNC_NORMAL means -** to use normal fsync() semantics. {F10264} The SQLITE_SYNC_FULL flag means +** information need not be flushed. The SQLITE_SYNC_NORMAL flag means +** to use normal fsync() semantics. The SQLITE_SYNC_FULL flag means ** to use Mac OS-X style fullsync instead of fsync(). */ #define SQLITE_SYNC_NORMAL 0x00002 #define SQLITE_SYNC_FULL 0x00003 #define SQLITE_SYNC_DATAONLY 0x00010 - /* -** CAPI3REF: OS Interface Open File Handle {F11110} +** CAPI3REF: OS Interface Open File Handle {H11110} ** ** An [sqlite3_file] object represents an open file in the OS ** interface layer. Individual OS interface implementations will @@ -468,19 +592,20 @@ struct sqlite3_file { }; /* -** CAPI3REF: OS Interface File Virtual Methods Object {F11120} +** CAPI3REF: OS Interface File Virtual Methods Object {H11120} ** -** Every file opened by the [sqlite3_vfs] xOpen method contains a pointer to -** an instance of the this object. This object defines the -** methods used to perform various operations against the open file. +** Every file opened by the [sqlite3_vfs] xOpen method populates an +** [sqlite3_file] object (or, more commonly, a subclass of the +** [sqlite3_file] object) with a pointer to an instance of this object. +** This object defines the methods used to perform various operations +** against the open file represented by the [sqlite3_file] object. ** ** The flags argument to xSync may be one of [SQLITE_SYNC_NORMAL] or ** [SQLITE_SYNC_FULL]. The first choice is the normal fsync(). -* The second choice is an -** OS-X style fullsync. The SQLITE_SYNC_DATA flag may be ORed in to -** indicate that only the data of the file and not its inode needs to be -** synced. -** +** The second choice is a Mac OS-X style fullsync. The [SQLITE_SYNC_DATAONLY] +** flag may be ORed in to indicate that only the data of the file +** and not its inode needs to be synced. +** ** The integer values to xLock() and xUnlock() are one of **
    **
  • [SQLITE_LOCK_NONE], @@ -489,26 +614,24 @@ struct sqlite3_file { **
  • [SQLITE_LOCK_PENDING], or **
  • [SQLITE_LOCK_EXCLUSIVE]. **
-** xLock() increases the lock. xUnlock() decreases the lock. -** The xCheckReservedLock() method looks -** to see if any database connection, either in this -** process or in some other process, is holding an RESERVED, +** xLock() increases the lock. xUnlock() decreases the lock. +** The xCheckReservedLock() method checks whether any database connection, +** either in this process or in some other process, is holding a RESERVED, ** PENDING, or EXCLUSIVE lock on the file. It returns true -** if such a lock exists and false if not. -** +** if such a lock exists and false otherwise. +** ** The xFileControl() method is a generic interface that allows custom ** VFS implementations to directly control an open file using the -** [sqlite3_file_control()] interface. The second "op" argument -** is an integer opcode. The third -** argument is a generic pointer which is intended to be a pointer -** to a structure that may contain arguments or space in which to +** [sqlite3_file_control()] interface. The second "op" argument is an +** integer opcode. The third argument is a generic pointer intended to +** point to a structure that may contain arguments or space in which to ** write return values. Potential uses for xFileControl() might be ** functions to enable blocking locks with timeouts, to change the ** locking strategy (for example to use dot-file locks), to inquire ** about the status of a lock, or to break stale locks. The SQLite -** core reserves opcodes less than 100 for its own use. +** core reserves all opcodes less than 100 for its own use. ** A [SQLITE_FCNTL_LOCKSTATE | list of opcodes] less than 100 is available. -** Applications that define a custom xFileControl method should use opcodes +** Applications that define a custom xFileControl method should use opcodes ** greater than 100 to avoid conflicts. ** ** The xSectorSize() method returns the sector size of the @@ -554,7 +677,7 @@ struct sqlite3_io_methods { int (*xFileSize)(sqlite3_file*, sqlite3_int64 *pSize); int (*xLock)(sqlite3_file*, int); int (*xUnlock)(sqlite3_file*, int); - int (*xCheckReservedLock)(sqlite3_file*); + int (*xCheckReservedLock)(sqlite3_file*, int *pResOut); int (*xFileControl)(sqlite3_file*, int op, void *pArg); int (*xSectorSize)(sqlite3_file*); int (*xDeviceCharacteristics)(sqlite3_file*); @@ -562,28 +685,28 @@ struct sqlite3_io_methods { }; /* -** CAPI3REF: Standard File Control Opcodes {F11310} +** CAPI3REF: Standard File Control Opcodes {H11310} ** ** These integer constants are opcodes for the xFileControl method -** of the [sqlite3_io_methods] object and to the [sqlite3_file_control()] +** of the [sqlite3_io_methods] object and for the [sqlite3_file_control()] ** interface. ** -** {F11311} The [SQLITE_FCNTL_LOCKSTATE] opcode is used for debugging. This -** opcode cases the xFileControl method to write the current state of +** The [SQLITE_FCNTL_LOCKSTATE] opcode is used for debugging. This +** opcode causes the xFileControl method to write the current state of ** the lock (one of [SQLITE_LOCK_NONE], [SQLITE_LOCK_SHARED], ** [SQLITE_LOCK_RESERVED], [SQLITE_LOCK_PENDING], or [SQLITE_LOCK_EXCLUSIVE]) -** into an integer that the pArg argument points to. {F11312} This capability +** into an integer that the pArg argument points to. This capability ** is used during testing and only needs to be supported when SQLITE_TEST ** is defined. */ #define SQLITE_FCNTL_LOCKSTATE 1 /* -** CAPI3REF: Mutex Handle {F17110} +** CAPI3REF: Mutex Handle {H17110} ** ** The mutex module within SQLite defines [sqlite3_mutex] to be an -** abstract type for a mutex object. {F17111} The SQLite core never looks -** at the internal representation of an [sqlite3_mutex]. {END} It only +** abstract type for a mutex object. The SQLite core never looks +** at the internal representation of an [sqlite3_mutex]. It only ** deals with pointers to the [sqlite3_mutex] object. ** ** Mutexes are created using [sqlite3_mutex_alloc()]. @@ -591,27 +714,31 @@ struct sqlite3_io_methods { typedef struct sqlite3_mutex sqlite3_mutex; /* -** CAPI3REF: OS Interface Object {F11140} +** CAPI3REF: OS Interface Object {H11140} ** -** An instance of this object defines the interface between the -** SQLite core and the underlying operating system. The "vfs" +** An instance of the sqlite3_vfs object defines the interface between +** the SQLite core and the underlying operating system. The "vfs" ** in the name of the object stands for "virtual file system". ** -** The iVersion field is initially 1 but may be larger for future -** versions of SQLite. Additional fields may be appended to this -** object when the iVersion value is increased. +** The value of the iVersion field is initially 1 but may be larger in +** future versions of SQLite. Additional fields may be appended to this +** object when the iVersion value is increased. Note that the structure +** of the sqlite3_vfs object changes in the transaction between +** SQLite version 3.5.9 and 3.6.0 and yet the iVersion field was not +** modified. ** ** The szOsFile field is the size of the subclassed [sqlite3_file] ** structure used by this VFS. mxPathname is the maximum length of ** a pathname in this VFS. ** -** Registered vfs modules are kept on a linked list formed by +** Registered sqlite3_vfs objects are kept on a linked list formed by ** the pNext pointer. The [sqlite3_vfs_register()] ** and [sqlite3_vfs_unregister()] interfaces manage this list ** in a thread-safe way. The [sqlite3_vfs_find()] interface -** searches the list. +** searches the list. Neither the application code nor the VFS +** implementation should use the pNext pointer. ** -** The pNext field is the only fields in the sqlite3_vfs +** The pNext field is the only field in the sqlite3_vfs ** structure that SQLite will ever modify. SQLite will only access ** or modify this field while holding a particular static mutex. ** The application should never modify anything within the sqlite3_vfs @@ -620,23 +747,28 @@ typedef struct sqlite3_mutex sqlite3_mutex; ** The zName field holds the name of the VFS module. The name must ** be unique across all VFS modules. ** -** {F11141} SQLite will guarantee that the zFilename string passed to -** xOpen() is a full pathname as generated by xFullPathname() and -** that the string will be valid and unchanged until xClose() is -** called. {END} So the [sqlite3_file] can store a pointer to the +** {H11141} SQLite will guarantee that the zFilename parameter to xOpen +** is either a NULL pointer or string obtained +** from xFullPathname(). SQLite further guarantees that +** the string will be valid and unchanged until xClose() is +** called. {END} Because of the previous sentense, +** the [sqlite3_file] can safely store a pointer to the ** filename if it needs to remember the filename for some reason. +** If the zFilename parameter is xOpen is a NULL pointer then xOpen +** must invite its own temporary name for the file. Whenever the +** xFilename parameter is NULL it will also be the case that the +** flags parameter will include [SQLITE_OPEN_DELETEONCLOSE]. ** -** {F11142} The flags argument to xOpen() includes all bits set in +** {H11142} The flags argument to xOpen() includes all bits set in ** the flags argument to [sqlite3_open_v2()]. Or if [sqlite3_open()] ** or [sqlite3_open16()] is used, then flags includes at least ** [SQLITE_OPEN_READWRITE] | [SQLITE_OPEN_CREATE]. {END} ** If xOpen() opens a file read-only then it sets *pOutFlags to -** include [SQLITE_OPEN_READONLY]. Other bits in *pOutFlags may be -** set. -** -** {F11143} SQLite will also add one of the following flags to the xOpen() +** include [SQLITE_OPEN_READONLY]. Other bits in *pOutFlags may be set. +** +** {H11143} SQLite will also add one of the following flags to the xOpen() ** call, depending on the object being opened: -** +** **
    **
  • [SQLITE_OPEN_MAIN_DB] **
  • [SQLITE_OPEN_MAIN_JOURNAL] @@ -648,59 +780,56 @@ typedef struct sqlite3_mutex sqlite3_mutex; **
{END} ** ** The file I/O implementation can use the object type flags to -** changes the way it deals with files. For example, an application -** that does not care about crash recovery or rollback, might make -** the open of a journal file a no-op. Writes to this journal are -** also a no-op. Any attempt to read the journal return SQLITE_IOERR. -** Or the implementation might recognize the a database file will -** be doing page-aligned sector reads and writes in a random order -** and set up its I/O subsystem accordingly. -** -** {F11144} SQLite might also add one of the following flags to the xOpen -** method: -** +** change the way it deals with files. For example, an application +** that does not care about crash recovery or rollback might make +** the open of a journal file a no-op. Writes to this journal would +** also be no-ops, and any attempt to read the journal would return +** SQLITE_IOERR. Or the implementation might recognize that a database +** file will be doing page-aligned sector reads and writes in a random +** order and set up its I/O subsystem accordingly. +** +** SQLite might also add one of the following flags to the xOpen method: +** **
    **
  • [SQLITE_OPEN_DELETEONCLOSE] **
  • [SQLITE_OPEN_EXCLUSIVE] **
-** -** {F11145} The [SQLITE_OPEN_DELETEONCLOSE] flag means the file should be -** deleted when it is closed. {F11146} The [SQLITE_OPEN_DELETEONCLOSE] -** will be set for TEMP databases, journals and for subjournals. -** {F11147} The [SQLITE_OPEN_EXCLUSIVE] flag means the file should be opened +** +** {H11145} The [SQLITE_OPEN_DELETEONCLOSE] flag means the file should be +** deleted when it is closed. {H11146} The [SQLITE_OPEN_DELETEONCLOSE] +** will be set for TEMP databases, journals and for subjournals. +** +** {H11147} The [SQLITE_OPEN_EXCLUSIVE] flag means the file should be opened ** for exclusive access. This flag is set for all files except -** for the main database file. {END} -** -** {F11148} At least szOsFile bytes of memory is allocated by SQLite -** to hold the [sqlite3_file] structure passed as the third -** argument to xOpen. {END} The xOpen method does not have to +** for the main database file. +** +** {H11148} At least szOsFile bytes of memory are allocated by SQLite +** to hold the [sqlite3_file] structure passed as the third +** argument to xOpen. {END} The xOpen method does not have to ** allocate the structure; it should just fill it in. -** -** {F11149} The flags argument to xAccess() may be [SQLITE_ACCESS_EXISTS] -** to test for the existance of a file, -** or [SQLITE_ACCESS_READWRITE] to test to see -** if a file is readable and writable, or [SQLITE_ACCESS_READ] -** to test to see if a file is at least readable. {END} The file can be a +** +** {H11149} The flags argument to xAccess() may be [SQLITE_ACCESS_EXISTS] +** to test for the existence of a file, or [SQLITE_ACCESS_READWRITE] to +** test whether a file is readable and writable, or [SQLITE_ACCESS_READ] +** to test whether a file is at least readable. {END} The file can be a ** directory. -** -** {F11150} SQLite will always allocate at least mxPathname+1 byte for -** the output buffers for xGetTempname and xFullPathname. {F11151} The exact -** size of the output buffer is also passed as a parameter to both -** methods. {END} If the output buffer is not large enough, SQLITE_CANTOPEN -** should be returned. As this is handled as a fatal error by SQLite, -** vfs implementations should endeavor to prevent this by setting -** mxPathname to a sufficiently large value. -** +** +** {H11150} SQLite will always allocate at least mxPathname+1 bytes for the +** output buffer xFullPathname. {H11151} The exact size of the output buffer +** is also passed as a parameter to both methods. {END} If the output buffer +** is not large enough, [SQLITE_CANTOPEN] should be returned. Since this is +** handled as a fatal error by SQLite, vfs implementations should endeavor +** to prevent this by setting mxPathname to a sufficiently large value. +** ** The xRandomness(), xSleep(), and xCurrentTime() interfaces ** are not strictly a part of the filesystem, but they are ** included in the VFS structure for completeness. ** The xRandomness() function attempts to return nBytes bytes ** of good-quality randomness into zOut. The return value is -** the actual number of bytes of randomness obtained. The -** xSleep() method cause the calling thread to sleep for at +** the actual number of bytes of randomness obtained. +** The xSleep() method causes the calling thread to sleep for at ** least the number of microseconds given. The xCurrentTime() -** method returns a Julian Day Number for the current date and -** time. +** method returns a Julian Day Number for the current date and time. */ typedef struct sqlite3_vfs sqlite3_vfs; struct sqlite3_vfs { @@ -713,8 +842,7 @@ struct sqlite3_vfs { int (*xOpen)(sqlite3_vfs*, const char *zName, sqlite3_file*, int flags, int *pOutFlags); int (*xDelete)(sqlite3_vfs*, const char *zName, int syncDir); - int (*xAccess)(sqlite3_vfs*, const char *zName, int flags); - int (*xGetTempname)(sqlite3_vfs*, int nOut, char *zOut); + int (*xAccess)(sqlite3_vfs*, const char *zName, int flags, int *pResOut); int (*xFullPathname)(sqlite3_vfs*, const char *zName, int nOut, char *zOut); void *(*xDlOpen)(sqlite3_vfs*, const char *zFilename); void (*xDlError)(sqlite3_vfs*, int nByte, char *zErrMsg); @@ -723,229 +851,670 @@ struct sqlite3_vfs { int (*xRandomness)(sqlite3_vfs*, int nByte, char *zOut); int (*xSleep)(sqlite3_vfs*, int microseconds); int (*xCurrentTime)(sqlite3_vfs*, double*); + int (*xGetLastError)(sqlite3_vfs*, int, char *); /* New fields may be appended in figure versions. The iVersion ** value will increment whenever this happens. */ }; /* -** CAPI3REF: Flags for the xAccess VFS method {F11190} +** CAPI3REF: Flags for the xAccess VFS method {H11190} ** -** {F11191} These integer constants can be used as the third parameter to +** {H11191} These integer constants can be used as the third parameter to ** the xAccess method of an [sqlite3_vfs] object. {END} They determine -** the kind of what kind of permissions the xAccess method is -** looking for. {F11192} With SQLITE_ACCESS_EXISTS, the xAccess method -** simply checks to see if the file exists. {F11193} With -** SQLITE_ACCESS_READWRITE, the xAccess method checks to see -** if the file is both readable and writable. {F11194} With -** SQLITE_ACCESS_READ the xAccess method -** checks to see if the file is readable. +** what kind of permissions the xAccess method is looking for. +** {H11192} With SQLITE_ACCESS_EXISTS, the xAccess method +** simply checks whether the file exists. +** {H11193} With SQLITE_ACCESS_READWRITE, the xAccess method +** checks whether the file is both readable and writable. +** {H11194} With SQLITE_ACCESS_READ, the xAccess method +** checks whether the file is readable. */ #define SQLITE_ACCESS_EXISTS 0 #define SQLITE_ACCESS_READWRITE 1 #define SQLITE_ACCESS_READ 2 /* -** CAPI3REF: Enable Or Disable Extended Result Codes {F12200} +** CAPI3REF: Initialize The SQLite Library {H10130} +** +** The sqlite3_initialize() routine initializes the +** SQLite library. The sqlite3_shutdown() routine +** deallocates any resources that were allocated by sqlite3_initialize(). +** +** A call to sqlite3_initialize() is an "effective" call if it is +** the first time sqlite3_initialize() is invoked during the lifetime of +** the process, or if it is the first time sqlite3_initialize() is invoked +** following a call to sqlite3_shutdown(). Only an effective call +** of sqlite3_initialize() does any initialization. All other calls +** are harmless no-ops. +** +** Among other things, sqlite3_initialize() shall invoke +** sqlite3_os_init(). Similarly, sqlite3_shutdown() +** shall invoke sqlite3_os_end(). +** +** The sqlite3_initialize() routine returns SQLITE_OK on success. +** If for some reason, sqlite3_initialize() is unable to initialize +** the library (perhaps it is unable to allocate a needed resource such +** as a mutex) it returns an [error code] other than SQLITE_OK. +** +** The sqlite3_initialize() routine is called internally by many other +** SQLite interfaces so that an application usually does not need to +** invoke sqlite3_initialize() directly. For example, [sqlite3_open()] +** calls sqlite3_initialize() so the SQLite library will be automatically +** initialized when [sqlite3_open()] is called if it has not be initialized +** already. However, if SQLite is compiled with the SQLITE_OMIT_AUTOINIT +** compile-time option, then the automatic calls to sqlite3_initialize() +** are omitted and the application must call sqlite3_initialize() directly +** prior to using any other SQLite interface. For maximum portability, +** it is recommended that applications always invoke sqlite3_initialize() +** directly prior to using any other SQLite interface. Future releases +** of SQLite may require this. In other words, the behavior exhibited +** when SQLite is compiled with SQLITE_OMIT_AUTOINIT might become the +** default behavior in some future release of SQLite. +** +** The sqlite3_os_init() routine does operating-system specific +** initialization of the SQLite library. The sqlite3_os_end() +** routine undoes the effect of sqlite3_os_init(). Typical tasks +** performed by these routines include allocation or deallocation +** of static resources, initialization of global variables, +** setting up a default [sqlite3_vfs] module, or setting up +** a default configuration using [sqlite3_config()]. +** +** The application should never invoke either sqlite3_os_init() +** or sqlite3_os_end() directly. The application should only invoke +** sqlite3_initialize() and sqlite3_shutdown(). The sqlite3_os_init() +** interface is called automatically by sqlite3_initialize() and +** sqlite3_os_end() is called by sqlite3_shutdown(). Appropriate +** implementations for sqlite3_os_init() and sqlite3_os_end() +** are built into SQLite when it is compiled for unix, windows, or os/2. +** When built for other platforms (using the SQLITE_OS_OTHER=1 compile-time +** option) the application must supply a suitable implementation for +** sqlite3_os_init() and sqlite3_os_end(). An application-supplied +** implementation of sqlite3_os_init() or sqlite3_os_end() +** must return SQLITE_OK on success and some other [error code] upon +** failure. +*/ +int sqlite3_initialize(void); +int sqlite3_shutdown(void); +int sqlite3_os_init(void); +int sqlite3_os_end(void); + +/* +** CAPI3REF: Configuring The SQLite Library {H10145} +** EXPERIMENTAL +** +** The sqlite3_config() interface is used to make global configuration +** changes to SQLite in order to tune SQLite to the specific needs of +** the application. The default configuration is recommended for most +** applications and so this routine is usually not necessary. It is +** provided to support rare applications with unusual needs. +** +** The sqlite3_config() interface is not threadsafe. The application +** must insure that no other SQLite interfaces are invoked by other +** threads while sqlite3_config() is running. Furthermore, sqlite3_config() +** may only be invoked prior to library initialization using +** [sqlite3_initialize()] or after shutdown by [sqlite3_shutdown()]. +** Note, however, that sqlite3_config() can be called as part of the +** implementation of an application-defined [sqlite3_os_init()]. +** +** The first argument to sqlite3_config() is an integer +** [SQLITE_CONFIG_SINGLETHREAD | configuration option] that determines +** what property of SQLite is to be configured. Subsequent arguments +** vary depending on the [SQLITE_CONFIG_SINGLETHREAD | configuration option] +** in the first argument. +** +** When a configuration option is set, sqlite3_config() returns SQLITE_OK. +** If the option is unknown or SQLite is unable to set the option +** then this routine returns a non-zero [error code]. +*/ +int sqlite3_config(int, ...); + +/* +** CAPI3REF: Configure database connections {H10180} +** EXPERIMENTAL +** +** The sqlite3_db_config() interface is used to make configuration +** changes to a [database connection]. The interface is similar to +** [sqlite3_config()] except that the changes apply to a single +** [database connection] (specified in the first argument). The +** sqlite3_db_config() interface can only be used immediately after +** the database connection is created using [sqlite3_open()], +** [sqlite3_open16()], or [sqlite3_open_v2()]. +** +** The second argument to sqlite3_db_config(D,V,...) is the +** configuration verb - an integer code that indicates what +** aspect of the [database connection] is being configured. +** The only choice for this value is [SQLITE_DBCONFIG_LOOKASIDE]. +** New verbs are likely to be added in future releases of SQLite. +** Additional arguments depend on the verb. +*/ +int sqlite3_db_config(sqlite3*, int op, ...); + +/* +** CAPI3REF: Memory Allocation Routines {H10155} +** EXPERIMENTAL +** +** An instance of this object defines the interface between SQLite +** and low-level memory allocation routines. +** +** This object is used in only one place in the SQLite interface. +** A pointer to an instance of this object is the argument to +** [sqlite3_config()] when the configuration option is +** [SQLITE_CONFIG_MALLOC]. By creating an instance of this object +** and passing it to [sqlite3_config()] during configuration, an +** application can specify an alternative memory allocation subsystem +** for SQLite to use for all of its dynamic memory needs. +** +** Note that SQLite comes with a built-in memory allocator that is +** perfectly adequate for the overwhelming majority of applications +** and that this object is only useful to a tiny minority of applications +** with specialized memory allocation requirements. This object is +** also used during testing of SQLite in order to specify an alternative +** memory allocator that simulates memory out-of-memory conditions in +** order to verify that SQLite recovers gracefully from such +** conditions. +** +** The xMalloc, xFree, and xRealloc methods must work like the +** malloc(), free(), and realloc() functions from the standard library. +** +** xSize should return the allocated size of a memory allocation +** previously obtained from xMalloc or xRealloc. The allocated size +** is always at least as big as the requested size but may be larger. +** +** The xRoundup method returns what would be the allocated size of +** a memory allocation given a particular requested size. Most memory +** allocators round up memory allocations at least to the next multiple +** of 8. Some allocators round up to a larger multiple or to a power of 2. +** +** The xInit method initializes the memory allocator. (For example, +** it might allocate any require mutexes or initialize internal data +** structures. The xShutdown method is invoked (indirectly) by +** [sqlite3_shutdown()] and should deallocate any resources acquired +** by xInit. The pAppData pointer is used as the only parameter to +** xInit and xShutdown. +*/ +typedef struct sqlite3_mem_methods sqlite3_mem_methods; +struct sqlite3_mem_methods { + void *(*xMalloc)(int); /* Memory allocation function */ + void (*xFree)(void*); /* Free a prior allocation */ + void *(*xRealloc)(void*,int); /* Resize an allocation */ + int (*xSize)(void*); /* Return the size of an allocation */ + int (*xRoundup)(int); /* Round up request size to allocation size */ + int (*xInit)(void*); /* Initialize the memory allocator */ + void (*xShutdown)(void*); /* Deinitialize the memory allocator */ + void *pAppData; /* Argument to xInit() and xShutdown() */ +}; + +/* +** CAPI3REF: Configuration Options {H10160} +** EXPERIMENTAL +** +** These constants are the available integer configuration options that +** can be passed as the first argument to the [sqlite3_config()] interface. +** +** New configuration options may be added in future releases of SQLite. +** Existing configuration options might be discontinued. Applications +** should check the return code from [sqlite3_config()] to make sure that +** the call worked. The [sqlite3_config()] interface will return a +** non-zero [error code] if a discontinued or unsupported configuration option +** is invoked. +** +**
+**
SQLITE_CONFIG_SINGLETHREAD
+**
There are no arguments to this option. This option disables +** all mutexing and puts SQLite into a mode where it can only be used +** by a single thread.
+** +**
SQLITE_CONFIG_MULTITHREAD
+**
There are no arguments to this option. This option disables +** mutexing on [database connection] and [prepared statement] objects. +** The application is responsible for serializing access to +** [database connections] and [prepared statements]. But other mutexes +** are enabled so that SQLite will be safe to use in a multi-threaded +** environment.
+** +**
SQLITE_CONFIG_SERIALIZED
+**
There are no arguments to this option. This option enables +** all mutexes including the recursive +** mutexes on [database connection] and [prepared statement] objects. +** In this mode (which is the default when SQLite is compiled with +** [SQLITE_THREADSAFE=1]) the SQLite library will itself serialize access +** to [database connections] and [prepared statements] so that the +** application is free to use the same [database connection] or the +** same [prepared statement] in different threads at the same time. +** +**

This configuration option merely sets the default mutex +** behavior to serialize access to [database connections]. Individual +** [database connections] can override this setting +** using the [SQLITE_OPEN_NOMUTEX] flag to [sqlite3_open_v2()].

+** +**
SQLITE_CONFIG_MALLOC
+**
This option takes a single argument which is a pointer to an +** instance of the [sqlite3_mem_methods] structure. The argument specifies +** alternative low-level memory allocation routines to be used in place of +** the memory allocation routines built into SQLite.
+** +**
SQLITE_CONFIG_GETMALLOC
+**
This option takes a single argument which is a pointer to an +** instance of the [sqlite3_mem_methods] structure. The [sqlite3_mem_methods] +** structure is filled with the currently defined memory allocation routines. +** This option can be used to overload the default memory allocation +** routines with a wrapper that simulations memory allocation failure or +** tracks memory usage, for example.
+** +**
SQLITE_CONFIG_MEMSTATUS
+**
This option takes single argument of type int, interpreted as a +** boolean, which enables or disables the collection of memory allocation +** statistics. When disabled, the following SQLite interfaces become +** non-operational: +**
    +**
  • [sqlite3_memory_used()] +**
  • [sqlite3_memory_highwater()] +**
  • [sqlite3_soft_heap_limit()] +**
  • [sqlite3_status()] +**
+**
+** +**
SQLITE_CONFIG_SCRATCH
+**
This option specifies a static memory buffer that SQLite can use for +** scratch memory. There are three arguments: A pointer to the memory, the +** size of each scratch buffer (sz), and the number of buffers (N). The sz +** argument must be a multiple of 16. The sz parameter should be a few bytes +** larger than the actual scratch space required due internal overhead. +** The first +** argument should point to an allocation of at least sz*N bytes of memory. +** SQLite will use no more than one scratch buffer at once per thread, so +** N should be set to the expected maximum number of threads. The sz +** parameter should be 6 times the size of the largest database page size. +** Scratch buffers are used as part of the btree balance operation. If +** The btree balancer needs additional memory beyond what is provided by +** scratch buffers or if no scratch buffer space is specified, then SQLite +** goes to [sqlite3_malloc()] to obtain the memory it needs.
+** +**
SQLITE_CONFIG_PAGECACHE
+**
This option specifies a static memory buffer that SQLite can use for +** the database page cache. There are three arguments: A pointer to the +** memory, the size of each page buffer (sz), and the number of pages (N). +** The sz argument must be a power of two between 512 and 32768. The first +** argument should point to an allocation of at least sz*N bytes of memory. +** SQLite will use the memory provided by the first argument to satisfy its +** memory needs for the first N pages that it adds to cache. If additional +** page cache memory is needed beyond what is provided by this option, then +** SQLite goes to [sqlite3_malloc()] for the additional storage space. +** The implementation might use one or more of the N buffers to hold +** memory accounting information.
+** +**
SQLITE_CONFIG_HEAP
+**
This option specifies a static memory buffer that SQLite will use +** for all of its dynamic memory allocation needs beyond those provided +** for by [SQLITE_CONFIG_SCRATCH] and [SQLITE_CONFIG_PAGECACHE]. +** There are three arguments: A pointer to the memory, the number of +** bytes in the memory buffer, and the minimum allocation size. If +** the first pointer (the memory pointer) is NULL, then SQLite reverts +** to using its default memory allocator (the system malloc() implementation), +** undoing any prior invocation of [SQLITE_CONFIG_MALLOC]. If the +** memory pointer is not NULL and either [SQLITE_ENABLE_MEMSYS3] or +** [SQLITE_ENABLE_MEMSYS5] are defined, then the alternative memory +** allocator is engaged to handle all of SQLites memory allocation needs.
+** +**
SQLITE_CONFIG_MUTEX
+**
This option takes a single argument which is a pointer to an +** instance of the [sqlite3_mutex_methods] structure. The argument specifies +** alternative low-level mutex routines to be used in place +** the mutex routines built into SQLite.
+** +**
SQLITE_CONFIG_GETMUTEX
+**
This option takes a single argument which is a pointer to an +** instance of the [sqlite3_mutex_methods] structure. The +** [sqlite3_mutex_methods] +** structure is filled with the currently defined mutex routines. +** This option can be used to overload the default mutex allocation +** routines with a wrapper used to track mutex usage for performance +** profiling or testing, for example.
+** +**
SQLITE_CONFIG_LOOKASIDE
+**
This option takes two arguments that determine the default +** memory allcation lookaside optimization. The first argument is the +** size of each lookaside buffer slot and the second is the number of +** slots allocated to each database connection.
+** +**
+*/ +#define SQLITE_CONFIG_SINGLETHREAD 1 /* nil */ +#define SQLITE_CONFIG_MULTITHREAD 2 /* nil */ +#define SQLITE_CONFIG_SERIALIZED 3 /* nil */ +#define SQLITE_CONFIG_MALLOC 4 /* sqlite3_mem_methods* */ +#define SQLITE_CONFIG_GETMALLOC 5 /* sqlite3_mem_methods* */ +#define SQLITE_CONFIG_SCRATCH 6 /* void*, int sz, int N */ +#define SQLITE_CONFIG_PAGECACHE 7 /* void*, int sz, int N */ +#define SQLITE_CONFIG_HEAP 8 /* void*, int nByte, int min */ +#define SQLITE_CONFIG_MEMSTATUS 9 /* boolean */ +#define SQLITE_CONFIG_MUTEX 10 /* sqlite3_mutex_methods* */ +#define SQLITE_CONFIG_GETMUTEX 11 /* sqlite3_mutex_methods* */ +#define SQLITE_CONFIG_CHUNKALLOC 12 /* int threshold */ +#define SQLITE_CONFIG_LOOKASIDE 13 /* int int */ + +/* +** CAPI3REF: Configuration Options {H10170} +** EXPERIMENTAL +** +** These constants are the available integer configuration options that +** can be passed as the second argument to the [sqlite3_db_config()] interface. +** +** New configuration options may be added in future releases of SQLite. +** Existing configuration options might be discontinued. Applications +** should check the return code from [sqlite3_db_config()] to make sure that +** the call worked. The [sqlite3_db_config()] interface will return a +** non-zero [error code] if a discontinued or unsupported configuration option +** is invoked. +** +**
+**
SQLITE_DBCONFIG_LOOKASIDE
+**
This option takes three additional arguments that determine the +** [lookaside memory allocator] configuration for the [database connection]. +** The first argument (the third parameter to [sqlite3_db_config()] is a +** pointer to a memory buffer to use for lookaside memory. The first +** argument may be NULL in which case SQLite will allocate the lookaside +** buffer itself using [sqlite3_malloc()]. The second argument is the +** size of each lookaside buffer slot and the third argument is the number of +** slots. The size of the buffer in the first argument must be greater than +** or equal to the product of the second and third arguments.
+** +**
+*/ +#define SQLITE_DBCONFIG_LOOKASIDE 1001 /* void* int int */ + + +/* +** CAPI3REF: Enable Or Disable Extended Result Codes {H12200} +** +** The sqlite3_extended_result_codes() routine enables or disables the +** [extended result codes] feature of SQLite. The extended result +** codes are disabled by default for historical compatibility considerations. +** +** INVARIANTS: ** -** {F12201} The sqlite3_extended_result_codes() routine enables or disables the -** [SQLITE_IOERR_READ | extended result codes] feature on a database -** connection if its 2nd parameter is -** non-zero or zero, respectively. {F12202} -** By default, SQLite API routines return one of only 26 integer -** [SQLITE_OK | result codes]. {F12203} When extended result codes -** are enabled by this routine, the repetoire of result codes can be -** much larger and can (hopefully) provide more detailed information -** about the cause of an error. +** {H12201} Each new [database connection] shall have the +** [extended result codes] feature disabled by default. ** -** {F12204} The second argument is a boolean value that turns extended result -** codes on and off. {F12205} Extended result codes are off by default for -** backwards compatibility with older versions of SQLite. +** {H12202} The [sqlite3_extended_result_codes(D,F)] interface shall enable +** [extended result codes] for the [database connection] D +** if the F parameter is true, or disable them if F is false. */ int sqlite3_extended_result_codes(sqlite3*, int onoff); /* -** CAPI3REF: Last Insert Rowid {F12220} +** CAPI3REF: Last Insert Rowid {H12220} ** -** {F12221} Each entry in an SQLite table has a unique 64-bit signed -** integer key called the "rowid". {F12222} The rowid is always available +** Each entry in an SQLite table has a unique 64-bit signed +** integer key called the "rowid". The rowid is always available ** as an undeclared column named ROWID, OID, or _ROWID_ as long as those -** names are not also used by explicitly declared columns. {F12223} If +** names are not also used by explicitly declared columns. If ** the table has a column of type INTEGER PRIMARY KEY then that column -** is another an alias for the rowid. -** -** {F12224} This routine returns the rowid of the most recent -** successful INSERT into the database from the database connection -** shown in the first argument. {F12225} If no successful inserts -** have ever occurred on this database connection, zero is returned. -** -** {F12226} If an INSERT occurs within a trigger, then the rowid of the -** inserted row is returned by this routine as long as the trigger -** is running. {F12227} But once the trigger terminates, the value returned -** by this routine reverts to the last value inserted before the -** trigger fired. -** -** {F12228} An INSERT that fails due to a constraint violation is not a -** successful insert and does not change the value returned by this -** routine. {F12229} Thus INSERT OR FAIL, INSERT OR IGNORE, INSERT OR ROLLBACK, +** is another alias for the rowid. +** +** This routine returns the rowid of the most recent +** successful INSERT into the database from the [database connection] +** in the first argument. If no successful INSERTs +** have ever occurred on that database connection, zero is returned. +** +** If an INSERT occurs within a trigger, then the rowid of the inserted +** row is returned by this routine as long as the trigger is running. +** But once the trigger terminates, the value returned by this routine +** reverts to the last value inserted before the trigger fired. +** +** An INSERT that fails due to a constraint violation is not a +** successful INSERT and does not change the value returned by this +** routine. Thus INSERT OR FAIL, INSERT OR IGNORE, INSERT OR ROLLBACK, ** and INSERT OR ABORT make no changes to the return value of this -** routine when their insertion fails. {F12231} When INSERT OR REPLACE +** routine when their insertion fails. When INSERT OR REPLACE ** encounters a constraint violation, it does not fail. The ** INSERT continues to completion after deleting rows that caused ** the constraint problem so INSERT OR REPLACE will always change -** the return value of this interface. +** the return value of this interface. +** +** For the purposes of this routine, an INSERT is considered to +** be successful even if it is subsequently rolled back. +** +** INVARIANTS: +** +** {H12221} The [sqlite3_last_insert_rowid()] function returns the rowid +** of the most recent successful INSERT performed on the same +** [database connection] and within the same or higher level +** trigger context, or zero if there have been no qualifying inserts. +** +** {H12223} The [sqlite3_last_insert_rowid()] function returns the +** same value when called from the same trigger context +** immediately before and after a ROLLBACK. +** +** ASSUMPTIONS: ** -** {UF12232} If another thread does a new insert on the same database connection -** while this routine is running and thus changes the last insert rowid, -** then the return value of this routine is undefined. +** {A12232} If a separate thread performs a new INSERT on the same +** database connection while the [sqlite3_last_insert_rowid()] +** function is running and thus changes the last insert rowid, +** then the value returned by [sqlite3_last_insert_rowid()] is +** unpredictable and might not equal either the old or the new +** last insert rowid. */ sqlite3_int64 sqlite3_last_insert_rowid(sqlite3*); /* -** CAPI3REF: Count The Number Of Rows Modified {F12240} +** CAPI3REF: Count The Number Of Rows Modified {H12240} ** -** {F12241} This function returns the number of database rows that were changed +** This function returns the number of database rows that were changed ** or inserted or deleted by the most recently completed SQL statement -** on the connection specified by the first parameter. {F12242} Only -** changes that are directly specified by the INSERT, UPDATE, or -** DELETE statement are counted. Auxiliary changes caused by -** triggers are not counted. {F12243} Use the [sqlite3_total_changes()] function +** on the [database connection] specified by the first parameter. +** Only changes that are directly specified by the INSERT, UPDATE, +** or DELETE statement are counted. Auxiliary changes caused by +** triggers are not counted. Use the [sqlite3_total_changes()] function ** to find the total number of changes including changes caused by triggers. ** -** {F12244} Within the body of a trigger, the sqlite3_changes() interface -** can be called to find the number of +** A "row change" is a change to a single row of a single table +** caused by an INSERT, DELETE, or UPDATE statement. Rows that +** are changed as side effects of REPLACE constraint resolution, +** rollback, ABORT processing, DROP TABLE, or by any other +** mechanisms do not count as direct row changes. +** +** A "trigger context" is a scope of execution that begins and +** ends with the script of a trigger. Most SQL statements are +** evaluated outside of any trigger. This is the "top level" +** trigger context. If a trigger fires from the top level, a +** new trigger context is entered for the duration of that one +** trigger. Subtriggers create subcontexts for their duration. +** +** Calling [sqlite3_exec()] or [sqlite3_step()] recursively does +** not create a new trigger context. +** +** This function returns the number of direct row changes in the +** most recent INSERT, UPDATE, or DELETE statement within the same +** trigger context. +** +** Thus, when called from the top level, this function returns the +** number of changes in the most recent INSERT, UPDATE, or DELETE +** that also occurred at the top level. Within the body of a trigger, +** the sqlite3_changes() interface can be called to find the number of ** changes in the most recently completed INSERT, UPDATE, or DELETE ** statement within the body of the same trigger. -** -** {F12245} All changes are counted, even if they are later undone by a -** ROLLBACK or ABORT. {F12246} Except, changes associated with creating and -** dropping tables are not counted. -** -** {F12247} If a callback invokes [sqlite3_exec()] or [sqlite3_step()] -** recursively, then the changes in the inner, recursive call are -** counted together with the changes in the outer call. -** -** {F12248} SQLite implements the command "DELETE FROM table" without -** a WHERE clause by dropping and recreating the table. (This is much -** faster than going through and deleting individual elements from the -** table.) Because of this optimization, the change count for -** "DELETE FROM table" will be zero regardless of the number of elements -** that were originally in the table. {F12251} To get an accurate count -** of the number of rows deleted, use +** However, the number returned does not include changes +** caused by subtriggers since those have their own context. +** +** SQLite implements the command "DELETE FROM table" without a WHERE clause +** by dropping and recreating the table. (This is much faster than going +** through and deleting individual elements from the table.) Because of this +** optimization, the deletions in "DELETE FROM table" are not row changes and +** will not be counted by the sqlite3_changes() or [sqlite3_total_changes()] +** functions, regardless of the number of elements that were originally +** in the table. To get an accurate count of the number of rows deleted, use ** "DELETE FROM table WHERE 1" instead. ** -** {UF12252} If another thread makes changes on the same database connection -** while this routine is running then the return value of this routine -** is undefined. +** INVARIANTS: +** +** {H12241} The [sqlite3_changes()] function shall return the number of +** row changes caused by the most recent INSERT, UPDATE, +** or DELETE statement on the same database connection and +** within the same or higher trigger context, or zero if there have +** not been any qualifying row changes. +** +** {H12243} Statements of the form "DELETE FROM tablename" with no +** WHERE clause shall cause subsequent calls to +** [sqlite3_changes()] to return zero, regardless of the +** number of rows originally in the table. +** +** ASSUMPTIONS: +** +** {A12252} If a separate thread makes changes on the same database connection +** while [sqlite3_changes()] is running then the value returned +** is unpredictable and not meaningful. */ int sqlite3_changes(sqlite3*); /* -** CAPI3REF: Total Number Of Rows Modified {F12260} -*** -** {F12261} This function returns the number of database rows that have been -** modified by INSERT, UPDATE or DELETE statements since the database handle -** was opened. {F12262} The count includes UPDATE, INSERT and DELETE -** statements executed as part of trigger programs. {F12263} All changes -** are counted as soon as the statement that makes them is completed -** (when the statement handle is passed to [sqlite3_reset()] or -** [sqlite3_finalize()]). {END} -** -** See also the [sqlite3_change()] interface. -** -** {F12265} SQLite implements the command "DELETE FROM table" without -** a WHERE clause by dropping and recreating the table. (This is much -** faster than going -** through and deleting individual elements form the table.) Because of -** this optimization, the change count for "DELETE FROM table" will be -** zero regardless of the number of elements that were originally in the -** table. To get an accurate count of the number of rows deleted, use +** CAPI3REF: Total Number Of Rows Modified {H12260} +** +** This function returns the number of row changes caused by INSERT, +** UPDATE or DELETE statements since the [database connection] was opened. +** The count includes all changes from all trigger contexts. However, +** the count does not include changes used to implement REPLACE constraints, +** do rollbacks or ABORT processing, or DROP table processing. +** The changes are counted as soon as the statement that makes them is +** completed (when the statement handle is passed to [sqlite3_reset()] or +** [sqlite3_finalize()]). +** +** SQLite implements the command "DELETE FROM table" without a WHERE clause +** by dropping and recreating the table. (This is much faster than going +** through and deleting individual elements from the table.) Because of this +** optimization, the deletions in "DELETE FROM table" are not row changes and +** will not be counted by the sqlite3_changes() or [sqlite3_total_changes()] +** functions, regardless of the number of elements that were originally +** in the table. To get an accurate count of the number of rows deleted, use ** "DELETE FROM table WHERE 1" instead. ** -** {U12264} If another thread makes changes on the same database connection -** while this routine is running then the return value of this routine -** is undefined. {END} +** See also the [sqlite3_changes()] interface. +** +** INVARIANTS: +** +** {H12261} The [sqlite3_total_changes()] returns the total number +** of row changes caused by INSERT, UPDATE, and/or DELETE +** statements on the same [database connection], in any +** trigger context, since the database connection was created. +** +** {H12263} Statements of the form "DELETE FROM tablename" with no +** WHERE clause shall not change the value returned +** by [sqlite3_total_changes()]. +** +** ASSUMPTIONS: +** +** {A12264} If a separate thread makes changes on the same database connection +** while [sqlite3_total_changes()] is running then the value +** returned is unpredictable and not meaningful. */ int sqlite3_total_changes(sqlite3*); /* -** CAPI3REF: Interrupt A Long-Running Query {F12270} +** CAPI3REF: Interrupt A Long-Running Query {H12270} ** -** {F12271} This function causes any pending database operation to abort and -** return at its earliest opportunity. {END} This routine is typically +** This function causes any pending database operation to abort and +** return at its earliest opportunity. This routine is typically ** called in response to a user action such as pressing "Cancel" ** or Ctrl-C where the user wants a long query operation to halt ** immediately. ** -** {F12272} It is safe to call this routine from a thread different from the -** thread that is currently running the database operation. {U12273} But it -** is not safe to call this routine with a database connection that +** It is safe to call this routine from a thread different from the +** thread that is currently running the database operation. But it +** is not safe to call this routine with a [database connection] that ** is closed or might close before sqlite3_interrupt() returns. ** -** If an SQL is very nearly finished at the time when sqlite3_interrupt() -** is called, then it might not have an opportunity to be interrupted. -** It might continue to completion. -** {F12274} The SQL operation that is interrupted will return -** [SQLITE_INTERRUPT]. {F12275} If the interrupted SQL operation is an -** INSERT, UPDATE, or DELETE that is inside an explicit transaction, -** then the entire transaction will be rolled back automatically. -** {F12276} A call to sqlite3_interrupt() has no effect on SQL statements +** If an SQL operation is very nearly finished at the time when +** sqlite3_interrupt() is called, then it might not have an opportunity +** to be interrupted and might continue to completion. +** +** An SQL operation that is interrupted will return [SQLITE_INTERRUPT]. +** If the interrupted SQL operation is an INSERT, UPDATE, or DELETE +** that is inside an explicit transaction, then the entire transaction +** will be rolled back automatically. +** +** A call to sqlite3_interrupt() has no effect on SQL statements ** that are started after sqlite3_interrupt() returns. +** +** INVARIANTS: +** +** {H12271} The [sqlite3_interrupt()] interface will force all running +** SQL statements associated with the same database connection +** to halt after processing at most one additional row of data. +** +** {H12272} Any SQL statement that is interrupted by [sqlite3_interrupt()] +** will return [SQLITE_INTERRUPT]. +** +** ASSUMPTIONS: +** +** {A12279} If the database connection closes while [sqlite3_interrupt()] +** is running then bad things will likely happen. */ void sqlite3_interrupt(sqlite3*); /* -** CAPI3REF: Determine If An SQL Statement Is Complete {F10510} +** CAPI3REF: Determine If An SQL Statement Is Complete {H10510} ** ** These routines are useful for command-line input to determine if the ** currently entered text seems to form complete a SQL statement or ** if additional input is needed before sending the text into ** SQLite for parsing. These routines return true if the input string ** appears to be a complete SQL statement. A statement is judged to be -** complete if it ends with a semicolon and is not a fragment of a -** CREATE TRIGGER statement. These routines do not parse the SQL and -** so will not detect syntactically incorrect SQL. -** -** {F10511} These functions return true if the given input string -** ends with a semicolon optionally followed by whitespace or -** comments. {F10512} For sqlite3_complete(), -** the parameter must be a zero-terminated UTF-8 string. {F10513} For -** sqlite3_complete16(), a zero-terminated machine byte order UTF-16 string -** is required. {F10514} These routines return false if the terminal -** semicolon is within a comment, a string literal or a quoted identifier -** (in other words if the final semicolon is not really a separate token -** but part of a larger token) or if the final semicolon is -** in between the BEGIN and END keywords of a CREATE TRIGGER statement. -** {END} +** complete if it ends with a semicolon token and is not a fragment of a +** CREATE TRIGGER statement. Semicolons that are embedded within +** string literals or quoted identifier names or comments are not +** independent tokens (they are part of the token in which they are +** embedded) and thus do not count as a statement terminator. +** +** These routines do not parse the SQL statements thus +** will not detect syntactically incorrect SQL. +** +** INVARIANTS: +** +** {H10511} A successful evaluation of [sqlite3_complete()] or +** [sqlite3_complete16()] functions shall +** return a numeric 1 if and only if the last non-whitespace +** token in their input is a semicolon that is not in between +** the BEGIN and END of a CREATE TRIGGER statement. +** +** {H10512} If a memory allocation error occurs during an invocation +** of [sqlite3_complete()] or [sqlite3_complete16()] then the +** routine shall return [SQLITE_NOMEM]. +** +** ASSUMPTIONS: +** +** {A10512} The input to [sqlite3_complete()] must be a zero-terminated +** UTF-8 string. +** +** {A10513} The input to [sqlite3_complete16()] must be a zero-terminated +** UTF-16 string in native byte order. */ int sqlite3_complete(const char *sql); int sqlite3_complete16(const void *sql); /* -** CAPI3REF: Register A Callback To Handle SQLITE_BUSY Errors {F12310} -** -** {F12311} This routine identifies a callback function that might be -** invoked whenever an attempt is made to open a database table -** that another thread or process has locked. -** {F12312} If the busy callback is NULL, then [SQLITE_BUSY] -** or [SQLITE_IOERR_BLOCKED] -** is returned immediately upon encountering the lock. -** {F12313} If the busy callback is not NULL, then the -** callback will be invoked with two arguments. {F12314} The -** first argument to the handler is a copy of the void* pointer which -** is the third argument to this routine. {F12315} The second argument to -** the handler is the number of times that the busy handler has -** been invoked for this locking event. {F12316} If the +** CAPI3REF: Register A Callback To Handle SQLITE_BUSY Errors {H12310} +** +** This routine sets a callback function that might be invoked whenever +** an attempt is made to open a database table that another thread +** or process has locked. +** +** If the busy callback is NULL, then [SQLITE_BUSY] or [SQLITE_IOERR_BLOCKED] +** is returned immediately upon encountering the lock. If the busy callback +** is not NULL, then the callback will be invoked with two arguments. +** +** The first argument to the handler is a copy of the void* pointer which +** is the third argument to sqlite3_busy_handler(). The second argument to +** the handler callback is the number of times that the busy handler has +** been invoked for this locking event. If the ** busy callback returns 0, then no additional attempts are made to ** access the database and [SQLITE_BUSY] or [SQLITE_IOERR_BLOCKED] is returned. -** {F12317} If the callback returns non-zero, then another attempt +** If the callback returns non-zero, then another attempt ** is made to open the database for reading and the cycle repeats. ** -** The presence of a busy handler does not guarantee that -** it will be invoked when there is lock contention. {F12319} -** If SQLite determines that invoking the busy handler could result in -** a deadlock, it will go ahead and return [SQLITE_BUSY] or -** [SQLITE_IOERR_BLOCKED] instead of invoking the -** busy handler. {END} +** The presence of a busy handler does not guarantee that it will be invoked +** when there is lock contention. If SQLite determines that invoking the busy +** handler could result in a deadlock, it will go ahead and return [SQLITE_BUSY] +** or [SQLITE_IOERR_BLOCKED] instead of invoking the busy handler. ** Consider a scenario where one process is holding a read lock that ** it is trying to promote to a reserved lock and ** a second process is holding a reserved lock that it is trying @@ -957,74 +1526,118 @@ int sqlite3_complete16(const void *sql); ** will induce the first process to release its read lock and allow ** the second process to proceed. ** -** {F12321} The default busy callback is NULL. {END} +** The default busy callback is NULL. ** -** {F12322} The [SQLITE_BUSY] error is converted to [SQLITE_IOERR_BLOCKED] +** The [SQLITE_BUSY] error is converted to [SQLITE_IOERR_BLOCKED] ** when SQLite is in the middle of a large transaction where all the -** changes will not fit into the in-memory cache. {F12323} SQLite will +** changes will not fit into the in-memory cache. SQLite will ** already hold a RESERVED lock on the database file, but it needs ** to promote this lock to EXCLUSIVE so that it can spill cache ** pages into the database file without harm to concurrent -** readers. {F12324} If it is unable to promote the lock, then the in-memory +** readers. If it is unable to promote the lock, then the in-memory ** cache will be left in an inconsistent state and so the error ** code is promoted from the relatively benign [SQLITE_BUSY] to -** the more severe [SQLITE_IOERR_BLOCKED]. {F12325} This error code promotion -** forces an automatic rollback of the changes. {END} See the -** +** the more severe [SQLITE_IOERR_BLOCKED]. This error code promotion +** forces an automatic rollback of the changes. See the +** ** CorruptionFollowingBusyError wiki page for a discussion of why ** this is important. -** -** {F12326} Sqlite is re-entrant, so the busy handler may start a new -** query. {END} (It is not clear why anyone would every want to do this, -** but it is allowed, in theory.) {U12327} But the busy handler may not -** close the database. Closing the database from a busy handler will delete -** data structures out from under the executing query and will -** probably result in a segmentation fault or other runtime error. {END} -** -** {F12328} There can only be a single busy handler defined for each database -** connection. Setting a new busy handler clears any previous one. -** {F12329} Note that calling [sqlite3_busy_timeout()] will also set or clear -** the busy handler. -** -** {F12331} When operating in [sqlite3_enable_shared_cache | shared cache mode], -** only a single busy handler can be defined for each database file. -** So if two database connections share a single cache, then changing -** the busy handler on one connection will also change the busy -** handler in the other connection. {F12332} The busy handler is invoked -** in the thread that was running when the lock contention occurs. +** +** There can only be a single busy handler defined for each +** [database connection]. Setting a new busy handler clears any +** previously set handler. Note that calling [sqlite3_busy_timeout()] +** will also set or clear the busy handler. +** +** INVARIANTS: +** +** {H12311} The [sqlite3_busy_handler(D,C,A)] function shall replace +** busy callback in the [database connection] D with a new +** a new busy handler C and application data pointer A. +** +** {H12312} Newly created [database connections] shall have a busy +** handler of NULL. +** +** {H12314} When two or more [database connections] share a +** [sqlite3_enable_shared_cache | common cache], +** the busy handler for the database connection currently using +** the cache shall be invoked when the cache encounters a lock. +** +** {H12316} If a busy handler callback returns zero, then the SQLite interface +** that provoked the locking event shall return [SQLITE_BUSY]. +** +** {H12318} SQLite shall invokes the busy handler with two arguments which +** are a copy of the pointer supplied by the 3rd parameter to +** [sqlite3_busy_handler()] and a count of the number of prior +** invocations of the busy handler for the same locking event. +** +** ASSUMPTIONS: +** +** {A12319} A busy handler must not close the database connection +** or [prepared statement] that invoked the busy handler. */ int sqlite3_busy_handler(sqlite3*, int(*)(void*,int), void*); /* -** CAPI3REF: Set A Busy Timeout {F12340} +** CAPI3REF: Set A Busy Timeout {H12340} ** -** {F12341} This routine sets a [sqlite3_busy_handler | busy handler] -** that sleeps for a while when a -** table is locked. {F12342} The handler will sleep multiple times until -** at least "ms" milliseconds of sleeping have been done. {F12343} After -** "ms" milliseconds of sleeping, the handler returns 0 which -** causes [sqlite3_step()] to return [SQLITE_BUSY] or [SQLITE_IOERR_BLOCKED]. +** This routine sets a [sqlite3_busy_handler | busy handler] that sleeps +** for a specified amount of time when a table is locked. The handler +** will sleep multiple times until at least "ms" milliseconds of sleeping +** have accumulated. {H12343} After "ms" milliseconds of sleeping, +** the handler returns 0 which causes [sqlite3_step()] to return +** [SQLITE_BUSY] or [SQLITE_IOERR_BLOCKED]. ** -** {F12344} Calling this routine with an argument less than or equal to zero +** Calling this routine with an argument less than or equal to zero ** turns off all busy handlers. ** -** {F12345} There can only be a single busy handler for a particular database -** connection. If another busy handler was defined -** (using [sqlite3_busy_handler()]) prior to calling +** There can only be a single busy handler for a particular +** [database connection] any any given moment. If another busy handler +** was defined (using [sqlite3_busy_handler()]) prior to calling ** this routine, that other busy handler is cleared. +** +** INVARIANTS: +** +** {H12341} The [sqlite3_busy_timeout()] function shall override any prior +** [sqlite3_busy_timeout()] or [sqlite3_busy_handler()] setting +** on the same [database connection]. +** +** {H12343} If the 2nd parameter to [sqlite3_busy_timeout()] is less than +** or equal to zero, then the busy handler shall be cleared so that +** all subsequent locking events immediately return [SQLITE_BUSY]. +** +** {H12344} If the 2nd parameter to [sqlite3_busy_timeout()] is a positive +** number N, then a busy handler shall be set that repeatedly calls +** the xSleep() method in the [sqlite3_vfs | VFS interface] until +** either the lock clears or until the cumulative sleep time +** reported back by xSleep() exceeds N milliseconds. */ int sqlite3_busy_timeout(sqlite3*, int ms); /* -** CAPI3REF: Convenience Routines For Running Queries {F12370} +** CAPI3REF: Convenience Routines For Running Queries {H12370} +** +** Definition: A result table is memory data structure created by the +** [sqlite3_get_table()] interface. A result table records the +** complete query results from one or more queries. +** +** The table conceptually has a number of rows and columns. But +** these numbers are not part of the result table itself. These +** numbers are obtained separately. Let N be the number of rows +** and M be the number of columns. +** +** A result table is an array of pointers to zero-terminated UTF-8 strings. +** There are (N+1)*M elements in the array. The first M pointers point +** to zero-terminated strings that contain the names of the columns. +** The remaining entries all point to query results. NULL values result +** in NULL pointers. All other values are in their UTF-8 zero-terminated +** string representation as returned by [sqlite3_column_text()]. ** -** This next routine is a convenience wrapper around [sqlite3_exec()]. -** {F12371} Instead of invoking a user-supplied callback for each row of the -** result, this routine remembers each row of the result in memory -** obtained from [sqlite3_malloc()], then returns all of the result after the -** query has finished. {F12372} +** A result table might consist of one or more memory allocations. +** It is not safe to pass a result table directly to [sqlite3_free()]. +** A result table should be deallocated using [sqlite3_free_table()]. ** -** As an example, suppose the query result where this table: +** As an example of the result table format, suppose a query result +** is as follows: ** ** 
 **        Name        | Age
@@ -1034,8 +1647,9 @@ int sqlite3_busy_timeout(sqlite3*, int ms);
 **        Cindy       | 21
 **
** -** If the 3rd argument were &azResult then after the function returns -** azResult will contain the following data: +** There are two column (M==2) and three rows (N==3). Thus the +** result table has 8 entries. Suppose the result table is stored +** in an array names azResult. Then azResult holds this content: ** ** 
 **        azResult[0] = "Name";
@@ -1048,75 +1662,112 @@ int sqlite3_busy_timeout(sqlite3*, int ms);
 **        azResult[7] = "21";
 **
** -** Notice that there is an extra row of data containing the column -** headers. But the *nrow return value is still 3. *ncolumn is -** set to 2. In general, the number of values inserted into azResult -** will be ((*nrow) + 1)*(*ncolumn). -** -** {U12374} After the calling function has finished using the result, it should -** pass the result data pointer to sqlite3_free_table() in order to -** release the memory that was malloc-ed. Because of the way the -** [sqlite3_malloc()] happens, the calling function must not try to call -** [sqlite3_free()] directly. Only [sqlite3_free_table()] is able to release -** the memory properly and safely. {END} -** -** {F12373} The return value of this routine is the same as -** from [sqlite3_exec()]. +** The sqlite3_get_table() function evaluates one or more +** semicolon-separated SQL statements in the zero-terminated UTF-8 +** string of its 2nd parameter. It returns a result table to the +** pointer given in its 3rd parameter. +** +** After the calling function has finished using the result, it should +** pass the pointer to the result table to sqlite3_free_table() in order to +** release the memory that was malloced. Because of the way the +** [sqlite3_malloc()] happens within sqlite3_get_table(), the calling +** function must not try to call [sqlite3_free()] directly. Only +** [sqlite3_free_table()] is able to release the memory properly and safely. +** +** The sqlite3_get_table() interface is implemented as a wrapper around +** [sqlite3_exec()]. The sqlite3_get_table() routine does not have access +** to any internal data structures of SQLite. It uses only the public +** interface defined here. As a consequence, errors that occur in the +** wrapper layer outside of the internal [sqlite3_exec()] call are not +** reflected in subsequent calls to [sqlite3_errcode()] or [sqlite3_errmsg()]. +** +** INVARIANTS: +** +** {H12371} If a [sqlite3_get_table()] fails a memory allocation, then +** it shall free the result table under construction, abort the +** query in process, skip any subsequent queries, set the +** *pazResult output pointer to NULL and return [SQLITE_NOMEM]. +** +** {H12373} If the pnColumn parameter to [sqlite3_get_table()] is not NULL +** then a successful invocation of [sqlite3_get_table()] shall +** write the number of columns in the +** result set of the query into *pnColumn. +** +** {H12374} If the pnRow parameter to [sqlite3_get_table()] is not NULL +** then a successful invocation of [sqlite3_get_table()] shall +** writes the number of rows in the +** result set of the query into *pnRow. +** +** {H12376} A successful invocation of [sqlite3_get_table()] that computes +** N rows of result with C columns per row shall make *pazResult +** point to an array of pointers to (N+1)*C strings where the first +** C strings are column names as obtained from +** [sqlite3_column_name()] and the rest are column result values +** obtained from [sqlite3_column_text()]. +** +** {H12379} The values in the pazResult array returned by [sqlite3_get_table()] +** shall remain valid until cleared by [sqlite3_free_table()]. +** +** {H12382} When an error occurs during evaluation of [sqlite3_get_table()] +** the function shall set *pazResult to NULL, write an error message +** into memory obtained from [sqlite3_malloc()], make +** **pzErrmsg point to that error message, and return a +** appropriate [error code]. */ int sqlite3_get_table( - sqlite3*, /* An open database */ - const char *sql, /* SQL to be executed */ - char ***resultp, /* Result written to a char *[] that this points to */ - int *nrow, /* Number of result rows written here */ - int *ncolumn, /* Number of result columns written here */ - char **errmsg /* Error msg written here */ + sqlite3 *db, /* An open database */ + const char *zSql, /* SQL to be evaluated */ + char ***pazResult, /* Results of the query */ + int *pnRow, /* Number of result rows written here */ + int *pnColumn, /* Number of result columns written here */ + char **pzErrmsg /* Error msg written here */ ); void sqlite3_free_table(char **result); /* -** CAPI3REF: Formatted String Printing Functions {F17400} +** CAPI3REF: Formatted String Printing Functions {H17400} ** ** These routines are workalikes of the "printf()" family of functions ** from the standard C library. ** -** {F17401} The sqlite3_mprintf() and sqlite3_vmprintf() routines write their +** The sqlite3_mprintf() and sqlite3_vmprintf() routines write their ** results into memory obtained from [sqlite3_malloc()]. -** {U17402} The strings returned by these two routines should be -** released by [sqlite3_free()]. {F17403} Both routines return a +** The strings returned by these two routines should be +** released by [sqlite3_free()]. Both routines return a ** NULL pointer if [sqlite3_malloc()] is unable to allocate enough ** memory to hold the resulting string. ** -** {F17404} In sqlite3_snprintf() routine is similar to "snprintf()" from +** In sqlite3_snprintf() routine is similar to "snprintf()" from ** the standard C library. The result is written into the ** buffer supplied as the second parameter whose size is given by -** the first parameter. {END} Note that the order of the +** the first parameter. Note that the order of the ** first two parameters is reversed from snprintf(). This is an ** historical accident that cannot be fixed without breaking -** backwards compatibility. {F17405} Note also that sqlite3_snprintf() +** backwards compatibility. Note also that sqlite3_snprintf() ** returns a pointer to its buffer instead of the number of -** characters actually written into the buffer. {END} We admit that +** characters actually written into the buffer. We admit that ** the number of characters written would be a more useful return ** value but we cannot change the implementation of sqlite3_snprintf() ** now without breaking compatibility. ** -** {F17406} As long as the buffer size is greater than zero, sqlite3_snprintf() -** guarantees that the buffer is always zero-terminated. {F17407} The first +** As long as the buffer size is greater than zero, sqlite3_snprintf() +** guarantees that the buffer is always zero-terminated. The first ** parameter "n" is the total size of the buffer, including space for -** the zero terminator. {END} So the longest string that can be completely +** the zero terminator. So the longest string that can be completely ** written will be n-1 characters. ** ** These routines all implement some additional formatting ** options that are useful for constructing SQL statements. -** All of the usual printf formatting options apply. In addition, there +** All of the usual printf() formatting options apply. In addition, there ** is are "%q", "%Q", and "%z" options. ** -** {F17410} The %q option works like %s in that it substitutes a null-terminated +** The %q option works like %s in that it substitutes a null-terminated ** string from the argument list. But %q also doubles every '\'' character. -** %q is designed for use inside a string literal. {END} By doubling each '\'' +** %q is designed for use inside a string literal. By doubling each '\'' ** character it escapes that character and allows it to be inserted into ** the string. ** -** For example, so some string variable contains text as follows: +** For example, assume the string variable zText contains text as follows: ** ** 
 **  char *zText = "It's a happy day!";
@@ -1144,14 +1795,13 @@ void sqlite3_free_table(char **result);
 **  INSERT INTO table1 VALUES('It's a happy day!');
 **
** -** This second example is an SQL syntax error. As a general rule you -** should always use %q instead of %s when inserting text into a string -** literal. +** This second example is an SQL syntax error. As a general rule you should +** always use %q instead of %s when inserting text into a string literal. ** -** {F17411} The %Q option works like %q except it also adds single quotes around -** the outside of the total string. Or if the parameter in the argument -** list is a NULL pointer, %Q substitutes the text "NULL" (without single -** quotes) in place of the %Q option. {END} So, for example, one could say: +** The %Q option works like %q except it also adds single quotes around +** the outside of the total string. Additionally, if the parameter in the +** argument list is a NULL pointer, %Q substitutes the text "NULL" (without +** single quotes) in place of the %Q option. So, for example, one could say: ** ** 
 **  char *zSQL = sqlite3_mprintf("INSERT INTO table VALUES(%Q)", zText);
@@ -1162,181 +1812,325 @@ void sqlite3_free_table(char **result);
 ** The code above will render a correct SQL statement in the zSQL
 ** variable even if the zText variable is a NULL pointer.
 **
-** {F17412} The "%z" formatting option works exactly like "%s" with the
+** The "%z" formatting option works exactly like "%s" with the
 ** addition that after the string has been read and copied into
 ** the result, [sqlite3_free()] is called on the input string. {END}
+**
+** INVARIANTS:
+**
+** {H17403}  The [sqlite3_mprintf()] and [sqlite3_vmprintf()] interfaces
+**           return either pointers to zero-terminated UTF-8 strings held in
+**           memory obtained from [sqlite3_malloc()] or NULL pointers if
+**           a call to [sqlite3_malloc()] fails.
+**
+** {H17406}  The [sqlite3_snprintf()] interface writes a zero-terminated
+**           UTF-8 string into the buffer pointed to by the second parameter
+**           provided that the first parameter is greater than zero.
+**
+** {H17407}  The [sqlite3_snprintf()] interface does not write slots of
+**           its output buffer (the second parameter) outside the range
+**           of 0 through N-1 (where N is the first parameter)
+**           regardless of the length of the string
+**           requested by the format specification.
 */
 char *sqlite3_mprintf(const char*,...);
 char *sqlite3_vmprintf(const char*, va_list);
 char *sqlite3_snprintf(int,char*,const char*, ...);
 
 /*
-** CAPI3REF: Memory Allocation Subsystem {F17300}
+** CAPI3REF: Memory Allocation Subsystem {H17300} 
 **
-** {F17301} The SQLite core  uses these three routines for all of its own
-** internal memory allocation needs. {END}  "Core" in the previous sentence
+** The SQLite core  uses these three routines for all of its own
+** internal memory allocation needs. "Core" in the previous sentence
 ** does not include operating-system specific VFS implementation.  The
-** windows VFS uses native malloc and free for some operations.
+** Windows VFS uses native malloc() and free() for some operations.
 **
-** {F17302} The sqlite3_malloc() routine returns a pointer to a block
+** The sqlite3_malloc() routine returns a pointer to a block
 ** of memory at least N bytes in length, where N is the parameter.
-** {F17303} If sqlite3_malloc() is unable to obtain sufficient free
-** memory, it returns a NULL pointer.  {F17304} If the parameter N to
+** If sqlite3_malloc() is unable to obtain sufficient free
+** memory, it returns a NULL pointer.  If the parameter N to
 ** sqlite3_malloc() is zero or negative then sqlite3_malloc() returns
 ** a NULL pointer.
 **
-** {F17305} Calling sqlite3_free() with a pointer previously returned
+** Calling sqlite3_free() with a pointer previously returned
 ** by sqlite3_malloc() or sqlite3_realloc() releases that memory so
-** that it might be reused.  {F17306} The sqlite3_free() routine is
+** that it might be reused.  The sqlite3_free() routine is
 ** a no-op if is called with a NULL pointer.  Passing a NULL pointer
-** to sqlite3_free() is harmless.  {U17307} After being freed, memory
+** to sqlite3_free() is harmless.  After being freed, memory
 ** should neither be read nor written.  Even reading previously freed
 ** memory might result in a segmentation fault or other severe error.
-** {U17309} Memory corruption, a segmentation fault, or other severe error
+** Memory corruption, a segmentation fault, or other severe error
 ** might result if sqlite3_free() is called with a non-NULL pointer that
 ** was not obtained from sqlite3_malloc() or sqlite3_free().
 **
-** {F17310} The sqlite3_realloc() interface attempts to resize a
+** The sqlite3_realloc() interface attempts to resize a
 ** prior memory allocation to be at least N bytes, where N is the
 ** second parameter.  The memory allocation to be resized is the first
-** parameter.  {F17311} If the first parameter to sqlite3_realloc()
+** parameter.  If the first parameter to sqlite3_realloc()
 ** is a NULL pointer then its behavior is identical to calling
 ** sqlite3_malloc(N) where N is the second parameter to sqlite3_realloc().
-** {F17312} If the second parameter to sqlite3_realloc() is zero or
+** If the second parameter to sqlite3_realloc() is zero or
 ** negative then the behavior is exactly the same as calling
 ** sqlite3_free(P) where P is the first parameter to sqlite3_realloc().
-** {F17313} Sqlite3_realloc() returns a pointer to a memory allocation
+** sqlite3_realloc() returns a pointer to a memory allocation
 ** of at least N bytes in size or NULL if sufficient memory is unavailable.
-** {F17314} If M is the size of the prior allocation, then min(N,M) bytes
+** If M is the size of the prior allocation, then min(N,M) bytes
 ** of the prior allocation are copied into the beginning of buffer returned
 ** by sqlite3_realloc() and the prior allocation is freed.
-** {F17315} If sqlite3_realloc() returns NULL, then the prior allocation
+** If sqlite3_realloc() returns NULL, then the prior allocation
 ** is not freed.
 **
-** {F17316} The memory returned by sqlite3_malloc() and sqlite3_realloc()
+** The memory returned by sqlite3_malloc() and sqlite3_realloc()
 ** is always aligned to at least an 8 byte boundary. {END}
 **
-** {F17381} The default implementation
-** of the memory allocation subsystem uses the malloc(), realloc()
-** and free() provided by the standard C library. {F17382} However, if 
-** SQLite is compiled with the following C preprocessor macro
-**
-** 
 SQLITE_MEMORY_SIZE=NNN 

-**
-** where NNN is an integer, then SQLite create a static
-** array of at least NNN bytes in size and use that array
-** for all of its dynamic memory allocation needs. {END}  Additional
-** memory allocator options may be added in future releases.
+** The default implementation of the memory allocation subsystem uses
+** the malloc(), realloc() and free() provided by the standard C library.
+** {H17382} However, if SQLite is compiled with the
+** SQLITE_MEMORY_SIZE=NNN C preprocessor macro (where NNN
+** is an integer), then SQLite create a static array of at least
+** NNN bytes in size and uses that array for all of its dynamic
+** memory allocation needs. {END}  Additional memory allocator options
+** may be added in future releases.
 **
 ** In SQLite version 3.5.0 and 3.5.1, it was possible to define
 ** the SQLITE_OMIT_MEMORY_ALLOCATION which would cause the built-in
 ** implementation of these routines to be omitted.  That capability
-** is no longer provided.  Only built-in memory allocators can be
-** used.
+** is no longer provided.  Only built-in memory allocators can be used.
 **
-** The windows OS interface layer calls
+** The Windows OS interface layer calls
 ** the system malloc() and free() directly when converting
 ** filenames between the UTF-8 encoding used by SQLite
-** and whatever filename encoding is used by the particular windows
+** and whatever filename encoding is used by the particular Windows
 ** installation.  Memory allocation errors are detected, but
 ** they are reported back as [SQLITE_CANTOPEN] or
 ** [SQLITE_IOERR] rather than [SQLITE_NOMEM].
+**
+** INVARIANTS:
+**
+** {H17303}  The [sqlite3_malloc(N)] interface returns either a pointer to
+**           a newly checked-out block of at least N bytes of memory
+**           that is 8-byte aligned, or it returns NULL if it is unable
+**           to fulfill the request.
+**
+** {H17304}  The [sqlite3_malloc(N)] interface returns a NULL pointer if
+**           N is less than or equal to zero.
+**
+** {H17305}  The [sqlite3_free(P)] interface releases memory previously
+**           returned from [sqlite3_malloc()] or [sqlite3_realloc()],
+**           making it available for reuse.
+**
+** {H17306}  A call to [sqlite3_free(NULL)] is a harmless no-op.
+**
+** {H17310}  A call to [sqlite3_realloc(0,N)] is equivalent to a call
+**           to [sqlite3_malloc(N)].
+**
+** {H17312}  A call to [sqlite3_realloc(P,0)] is equivalent to a call
+**           to [sqlite3_free(P)].
+**
+** {H17315}  The SQLite core uses [sqlite3_malloc()], [sqlite3_realloc()],
+**           and [sqlite3_free()] for all of its memory allocation and
+**           deallocation needs.
+**
+** {H17318}  The [sqlite3_realloc(P,N)] interface returns either a pointer
+**           to a block of checked-out memory of at least N bytes in size
+**           that is 8-byte aligned, or a NULL pointer.
+**
+** {H17321}  When [sqlite3_realloc(P,N)] returns a non-NULL pointer, it first
+**           copies the first K bytes of content from P into the newly
+**           allocated block, where K is the lesser of N and the size of
+**           the buffer P.
+**
+** {H17322}  When [sqlite3_realloc(P,N)] returns a non-NULL pointer, it first
+**           releases the buffer P.
+**
+** {H17323}  When [sqlite3_realloc(P,N)] returns NULL, the buffer P is
+**           not modified or released.
+**
+** ASSUMPTIONS:
+**
+** {A17350}  The pointer arguments to [sqlite3_free()] and [sqlite3_realloc()]
+**           must be either NULL or else pointers obtained from a prior
+**           invocation of [sqlite3_malloc()] or [sqlite3_realloc()] that have
+**           not yet been released.
+**
+** {A17351}  The application must not read or write any part of
+**           a block of memory after it has been released using
+**           [sqlite3_free()] or [sqlite3_realloc()].
 */
 void *sqlite3_malloc(int);
 void *sqlite3_realloc(void*, int);
 void sqlite3_free(void*);
 
 /*
-** CAPI3REF: Memory Allocator Statistics {F17370}
-**
-** In addition to the basic three allocation routines 
-** [sqlite3_malloc()], [sqlite3_free()], and [sqlite3_realloc()],
-** the memory allocation subsystem included with the SQLite
-** sources provides the interfaces shown here.
-**
-** {F17371} The sqlite3_memory_used() routine returns the
-** number of bytes of memory currently outstanding (malloced but not freed).
-** {F17372} The value returned by sqlite3_memory_used() includes
-** any overhead added by SQLite, but not overhead added by the
-** library malloc() that backs the sqlite3_malloc() implementation.
-** {F17373} The sqlite3_memory_highwater() routines returns the
-** maximum number of bytes that have been outstanding at any time
-** since the highwater mark was last reset.
-** {F17374} The byte count returned by sqlite3_memory_highwater()
-** uses the same byte counting rules as sqlite3_memory_used(). {END}
-** In other words, overhead added internally by SQLite is counted,
-** but overhead from the underlying system malloc is not.
-** {F17375} If the parameter to sqlite3_memory_highwater() is true,
-** then the highwater mark is reset to the current value of
-** sqlite3_memory_used() and the prior highwater mark (before the
-** reset) is returned.  {F17376}  If the parameter to 
-** sqlite3_memory_highwater() is zero, then the highwater mark is
-** unchanged.
+** CAPI3REF: Memory Allocator Statistics {H17370} 
+**
+** SQLite provides these two interfaces for reporting on the status
+** of the [sqlite3_malloc()], [sqlite3_free()], and [sqlite3_realloc()]
+** routines, which form the built-in memory allocation subsystem.
+**
+** INVARIANTS:
+**
+** {H17371} The [sqlite3_memory_used()] routine returns the number of bytes
+**          of memory currently outstanding (malloced but not freed).
+**
+** {H17373} The [sqlite3_memory_highwater()] routine returns the maximum
+**          value of [sqlite3_memory_used()] since the high-water mark
+**          was last reset.
+**
+** {H17374} The values returned by [sqlite3_memory_used()] and
+**          [sqlite3_memory_highwater()] include any overhead
+**          added by SQLite in its implementation of [sqlite3_malloc()],
+**          but not overhead added by the any underlying system library
+**          routines that [sqlite3_malloc()] may call.
+**
+** {H17375} The memory high-water mark is reset to the current value of
+**          [sqlite3_memory_used()] if and only if the parameter to
+**          [sqlite3_memory_highwater()] is true.  The value returned
+**          by [sqlite3_memory_highwater(1)] is the high-water mark
+**          prior to the reset.
 */
 sqlite3_int64 sqlite3_memory_used(void);
 sqlite3_int64 sqlite3_memory_highwater(int resetFlag);
 
 /*
-** CAPI3REF: Compile-Time Authorization Callbacks {F12500}
+** CAPI3REF: Pseudo-Random Number Generator {H17390} 
+**
+** SQLite contains a high-quality pseudo-random number generator (PRNG) used to
+** select random ROWIDs when inserting new records into a table that
+** already uses the largest possible ROWID.  The PRNG is also used for
+** the build-in random() and randomblob() SQL functions.  This interface allows
+** applications to access the same PRNG for other purposes.
 **
-** {F12501} This routine registers a authorizer callback with a particular
-** database connection, supplied in the first argument. {F12502}
+** A call to this routine stores N bytes of randomness into buffer P.
+**
+** The first time this routine is invoked (either internally or by
+** the application) the PRNG is seeded using randomness obtained
+** from the xRandomness method of the default [sqlite3_vfs] object.
+** On all subsequent invocations, the pseudo-randomness is generated
+** internally and without recourse to the [sqlite3_vfs] xRandomness
+** method.
+**
+** INVARIANTS:
+**
+** {H17392} The [sqlite3_randomness(N,P)] interface writes N bytes of
+**          high-quality pseudo-randomness into buffer P.
+*/
+void sqlite3_randomness(int N, void *P);
+
+/*
+** CAPI3REF: Compile-Time Authorization Callbacks {H12500} 
+**
+** This routine registers a authorizer callback with a particular
+** [database connection], supplied in the first argument.
 ** The authorizer callback is invoked as SQL statements are being compiled
 ** by [sqlite3_prepare()] or its variants [sqlite3_prepare_v2()],
-** [sqlite3_prepare16()] and [sqlite3_prepare16_v2()].  {F12503} At various
+** [sqlite3_prepare16()] and [sqlite3_prepare16_v2()].  At various
 ** points during the compilation process, as logic is being created
 ** to perform various actions, the authorizer callback is invoked to
 ** see if those actions are allowed.  The authorizer callback should
-** return SQLITE_OK to allow the action, [SQLITE_IGNORE] to disallow the
+** return [SQLITE_OK] to allow the action, [SQLITE_IGNORE] to disallow the
 ** specific action but allow the SQL statement to continue to be
 ** compiled, or [SQLITE_DENY] to cause the entire SQL statement to be
-** rejected with an error.  {F12504} If the authorizer callback returns
+** rejected with an error.  If the authorizer callback returns
 ** any value other than [SQLITE_IGNORE], [SQLITE_OK], or [SQLITE_DENY]
-** then [sqlite3_prepare_v2()] or equivalent call that triggered
-** the authorizer shall
-** fail with an SQLITE_ERROR error code and an appropriate error message. {END}
+** then the [sqlite3_prepare_v2()] or equivalent call that triggered
+** the authorizer will fail with an error message.
 **
 ** When the callback returns [SQLITE_OK], that means the operation
-** requested is ok.  {F12505} When the callback returns [SQLITE_DENY], the
+** requested is ok.  When the callback returns [SQLITE_DENY], the
 ** [sqlite3_prepare_v2()] or equivalent call that triggered the
-** authorizer shall fail
-** with an SQLITE_ERROR error code and an error message explaining that
-** access is denied. {F12506} If the authorizer code (the 2nd parameter
-** to the authorizer callback is anything other than [SQLITE_READ], then
-** a return of [SQLITE_IGNORE] has the same effect as [SQLITE_DENY]. 
-** If the authorizer code is [SQLITE_READ] and the callback returns
-** [SQLITE_IGNORE] then the prepared statement is constructed to
-** insert a NULL value in place of the table column that would have
-** been read if [SQLITE_OK] had been returned. {END}
-**
-** {F12510} The first parameter to the authorizer callback is a copy of
-** the third parameter to the sqlite3_set_authorizer() interface.
-** {F12511} The second parameter to the callback is an integer 
-** [SQLITE_COPY | action code] that specifies the particular action
-** to be authorized. {END} The available action codes are
-** [SQLITE_COPY | documented separately].  {F12512} The third through sixth
-** parameters to the callback are zero-terminated strings that contain 
-** additional details about the action to be authorized. {END}
-**
-** An authorizer is used when preparing SQL statements from an untrusted
-** source, to ensure that the SQL statements do not try to access data
-** that they are not allowed to see, or that they do not try to
-** execute malicious statements that damage the database.  For
+** authorizer will fail with an error message explaining that
+** access is denied.  If the authorizer code is [SQLITE_READ]
+** and the callback returns [SQLITE_IGNORE] then the
+** [prepared statement] statement is constructed to substitute
+** a NULL value in place of the table column that would have
+** been read if [SQLITE_OK] had been returned.  The [SQLITE_IGNORE]
+** return can be used to deny an untrusted user access to individual
+** columns of a table.
+**
+** The first parameter to the authorizer callback is a copy of the third
+** parameter to the sqlite3_set_authorizer() interface. The second parameter
+** to the callback is an integer [SQLITE_COPY | action code] that specifies
+** the particular action to be authorized. The third through sixth parameters
+** to the callback are zero-terminated strings that contain additional
+** details about the action to be authorized.
+**
+** An authorizer is used when [sqlite3_prepare | preparing]
+** SQL statements from an untrusted source, to ensure that the SQL statements
+** do not try to access data they are not allowed to see, or that they do not
+** try to execute malicious statements that damage the database.  For
 ** example, an application may allow a user to enter arbitrary
 ** SQL queries for evaluation by a database.  But the application does
 ** not want the user to be able to make arbitrary changes to the
 ** database.  An authorizer could then be put in place while the
-** user-entered SQL is being prepared that disallows everything
-** except SELECT statements.  
+** user-entered SQL is being [sqlite3_prepare | prepared] that
+** disallows everything except [SELECT] statements.
+**
+** Applications that need to process SQL from untrusted sources
+** might also consider lowering resource limits using [sqlite3_limit()]
+** and limiting database size using the [max_page_count] [PRAGMA]
+** in addition to using an authorizer.
 **
-** {F12520} Only a single authorizer can be in place on a database connection
+** Only a single authorizer can be in place on a database connection
 ** at a time.  Each call to sqlite3_set_authorizer overrides the
-** previous call. {F12521}  A NULL authorizer means that no authorization
-** callback is invoked.  {F12522} The default authorizer is NULL. {END}
+** previous call.  Disable the authorizer by installing a NULL callback.
+** The authorizer is disabled by default.
+**
+** Note that the authorizer callback is invoked only during
+** [sqlite3_prepare()] or its variants.  Authorization is not
+** performed during statement evaluation in [sqlite3_step()].
+**
+** INVARIANTS:
+**
+** {H12501} The [sqlite3_set_authorizer(D,...)] interface registers a
+**          authorizer callback with database connection D.
+**
+** {H12502} The authorizer callback is invoked as SQL statements are
+**          being compiled.
 **
-** Note that the authorizer callback is invoked only during 
-** [sqlite3_prepare()] or its variants.  {F12523} Authorization is not
-** performed during statement evaluation in [sqlite3_step()]. {END}
+** {H12503} If the authorizer callback returns any value other than
+**          [SQLITE_IGNORE], [SQLITE_OK], or [SQLITE_DENY], then
+**          the [sqlite3_prepare_v2()] or equivalent call that caused
+**          the authorizer callback to run shall fail with an
+**          [SQLITE_ERROR] error code and an appropriate error message.
+**
+** {H12504} When the authorizer callback returns [SQLITE_OK], the operation
+**          described is processed normally.
+**
+** {H12505} When the authorizer callback returns [SQLITE_DENY], the
+**          [sqlite3_prepare_v2()] or equivalent call that caused the
+**          authorizer callback to run shall fail
+**          with an [SQLITE_ERROR] error code and an error message
+**          explaining that access is denied.
+**
+** {H12506} If the authorizer code (the 2nd parameter to the authorizer
+**          callback) is [SQLITE_READ] and the authorizer callback returns
+**          [SQLITE_IGNORE], then the prepared statement is constructed to
+**          insert a NULL value in place of the table column that would have
+**          been read if [SQLITE_OK] had been returned.
+**
+** {H12507} If the authorizer code (the 2nd parameter to the authorizer
+**          callback) is anything other than [SQLITE_READ], then
+**          a return of [SQLITE_IGNORE] has the same effect as [SQLITE_DENY].
+**
+** {H12510} The first parameter to the authorizer callback is a copy of
+**          the third parameter to the [sqlite3_set_authorizer()] interface.
+**
+** {H12511} The second parameter to the callback is an integer
+**          [SQLITE_COPY | action code] that specifies the particular action
+**          to be authorized.
+**
+** {H12512} The third through sixth parameters to the callback are
+**          zero-terminated strings that contain
+**          additional details about the action to be authorized.
+**
+** {H12520} Each call to [sqlite3_set_authorizer()] overrides
+**          any previously installed authorizer.
+**
+** {H12521} A NULL authorizer means that no authorization
+**          callback is invoked.
+**
+** {H12522} The default authorizer is NULL.
 */
 int sqlite3_set_authorizer(
   sqlite3*,
@@ -1345,7 +2139,7 @@ int sqlite3_set_authorizer(
 );
 
 /*
-** CAPI3REF: Authorizer Return Codes {F12590}
+** CAPI3REF: Authorizer Return Codes {H12590} 
 **
 ** The [sqlite3_set_authorizer | authorizer callback function] must
 ** return either [SQLITE_OK] or one of these two constants in order
@@ -1357,23 +2151,45 @@ int sqlite3_set_authorizer(
 #define SQLITE_IGNORE 2   /* Don't allow access, but don't generate an error */
 
 /*
-** CAPI3REF: Authorizer Action Codes {F12550}
+** CAPI3REF: Authorizer Action Codes {H12550} 
 **
 ** The [sqlite3_set_authorizer()] interface registers a callback function
-** that is invoked to authorizer certain SQL statement actions.  {F12551} The
+** that is invoked to authorize certain SQL statement actions.  The
 ** second parameter to the callback is an integer code that specifies
 ** what action is being authorized.  These are the integer action codes that
-** the authorizer callback may be passed. {END}
+** the authorizer callback may be passed.
 **
-** These action code values signify what kind of operation is to be 
-** authorized.  {F12552} The 3rd and 4th parameters to the authorization
+** These action code values signify what kind of operation is to be
+** authorized.  The 3rd and 4th parameters to the authorization
 ** callback function will be parameters or NULL depending on which of these
-** codes is used as the second parameter. {F12553} The 5th parameter to the
-** authorizer callback is the name of the database ("main", "temp", 
-** etc.) if applicable. {F12554} The 6th parameter to the authorizer callback
+** codes is used as the second parameter.  The 5th parameter to the
+** authorizer callback is the name of the database ("main", "temp",
+** etc.) if applicable.  The 6th parameter to the authorizer callback
 ** is the name of the inner-most trigger or view that is responsible for
-** the access attempt or NULL if this access attempt is directly from 
+** the access attempt or NULL if this access attempt is directly from
 ** top-level SQL code.
+**
+** INVARIANTS:
+**
+** {H12551} The second parameter to an
+**          [sqlite3_set_authorizer | authorizer callback] is always an integer
+**          [SQLITE_COPY | authorizer code] that specifies what action
+**          is being authorized.
+**
+** {H12552} The 3rd and 4th parameters to the
+**          [sqlite3_set_authorizer | authorization callback]
+**          will be parameters or NULL depending on which
+**          [SQLITE_COPY | authorizer code] is used as the second parameter.
+**
+** {H12553} The 5th parameter to the
+**          [sqlite3_set_authorizer | authorizer callback] is the name
+**          of the database (example: "main", "temp", etc.) if applicable.
+**
+** {H12554} The 6th parameter to the
+**          [sqlite3_set_authorizer | authorizer callback] is the name
+**          of the inner-most trigger or view that is responsible for
+**          the access attempt or NULL if this access attempt is directly from
+**          top-level SQL code.
 */
 /******************************************* 3rd ************ 4th ***********/
 #define SQLITE_CREATE_INDEX          1   /* Index Name      Table Name      */
@@ -1410,149 +2226,257 @@ int sqlite3_set_authorizer(
 #define SQLITE_COPY                  0   /* No longer used */
 
 /*
-** CAPI3REF: Tracing And Profiling Functions {F12280}
+** CAPI3REF: Tracing And Profiling Functions {H12280} 
+** EXPERIMENTAL
 **
 ** These routines register callback functions that can be used for
 ** tracing and profiling the execution of SQL statements.
 **
-** {F12281} The callback function registered by sqlite3_trace() is invoked
-** at the first [sqlite3_step()] for the evaluation of an SQL statement.
-** {F12282} Only a single trace callback can be registered at a time.
-** Each call to sqlite3_trace() overrides the previous.  {F12283} A
-** NULL callback for sqlite3_trace() disables tracing.  {F12284} The
-** first argument to the trace callback is a copy of the pointer which
-** was the 3rd argument to sqlite3_trace.  {F12285} The second argument
-** to the trace callback is a zero-terminated UTF8 string containing
-** the original text of the SQL statement as it was passed into
-** [sqlite3_prepare_v2()] or the equivalent. {END}  Note that the
-** host parameter are not expanded in the SQL statement text.
-**
-** {F12287} The callback function registered by sqlite3_profile() is invoked
-** as each SQL statement finishes.  {F12288} The first parameter to the
-** profile callback is a copy of the 3rd parameter to sqlite3_profile().
-** {F12289} The second parameter to the profile callback is a
-** zero-terminated UTF-8 string that contains the complete text of
-** the SQL statement as it was processed by [sqlite3_prepare_v2()] or
-** the equivalent.  {F12290} The third parameter to the profile 
-** callback is an estimate of the number of nanoseconds of
-** wall-clock time required to run the SQL statement from start
-** to finish. {END}  
-**
-** The sqlite3_profile() API is currently considered experimental and
-** is subject to change.
+** The callback function registered by sqlite3_trace() is invoked at
+** various times when an SQL statement is being run by [sqlite3_step()].
+** The callback returns a UTF-8 rendering of the SQL statement text
+** as the statement first begins executing.  Additional callbacks occur
+** as each triggered subprogram is entered.  The callbacks for triggers
+** contain a UTF-8 SQL comment that identifies the trigger.
+**
+** The callback function registered by sqlite3_profile() is invoked
+** as each SQL statement finishes.  The profile callback contains
+** the original statement text and an estimate of wall-clock time
+** of how long that statement took to run.
+**
+** INVARIANTS:
+**
+** {H12281} The callback function registered by [sqlite3_trace()] is
+**          whenever an SQL statement first begins to execute and
+**          whenever a trigger subprogram first begins to run.
+**
+** {H12282} Each call to [sqlite3_trace()] overrides the previously
+**          registered trace callback.
+**
+** {H12283} A NULL trace callback disables tracing.
+**
+** {H12284} The first argument to the trace callback is a copy of
+**          the pointer which was the 3rd argument to [sqlite3_trace()].
+**
+** {H12285} The second argument to the trace callback is a
+**          zero-terminated UTF-8 string containing the original text
+**          of the SQL statement as it was passed into [sqlite3_prepare_v2()]
+**          or the equivalent, or an SQL comment indicating the beginning
+**          of a trigger subprogram.
+**
+** {H12287} The callback function registered by [sqlite3_profile()] is invoked
+**          as each SQL statement finishes.
+**
+** {H12288} The first parameter to the profile callback is a copy of
+**          the 3rd parameter to [sqlite3_profile()].
+**
+** {H12289} The second parameter to the profile callback is a
+**          zero-terminated UTF-8 string that contains the complete text of
+**          the SQL statement as it was processed by [sqlite3_prepare_v2()]
+**          or the equivalent.
+**
+** {H12290} The third parameter to the profile callback is an estimate
+**          of the number of nanoseconds of wall-clock time required to
+**          run the SQL statement from start to finish.
 */
 void *sqlite3_trace(sqlite3*, void(*xTrace)(void*,const char*), void*);
 void *sqlite3_profile(sqlite3*,
    void(*xProfile)(void*,const char*,sqlite3_uint64), void*);
 
 /*
-** CAPI3REF: Query Progress Callbacks {F12910}
+** CAPI3REF: Query Progress Callbacks {H12910} 
 **
-** {F12911} This routine configures a callback function - the
+** This routine configures a callback function - the
 ** progress callback - that is invoked periodically during long
 ** running calls to [sqlite3_exec()], [sqlite3_step()] and
-** [sqlite3_get_table()]. {END}  An example use for this 
+** [sqlite3_get_table()].  An example use for this
 ** interface is to keep a GUI updated during a large query.
 **
-** {F12912} The progress callback is invoked once for every N virtual
-** machine opcodes, where N is the second argument to this function.
-** {F12913} The progress callback itself is identified by the third
-** argument to this function. {F12914} The fourth argument to this
-** function is a void pointer passed to the progress callback
-** function each time it is invoked. {END}
-**
-** {F12915} If a call to [sqlite3_exec()], [sqlite3_step()], or
-** [sqlite3_get_table()] results in fewer than N opcodes being executed,
-** then the progress callback is never invoked. {END}
-** 
-** {F12916} Only a single progress callback function may be registered for each
-** open database connection.  Every call to sqlite3_progress_handler()
-** overwrites the results of the previous call. {F12917}
-** To remove the progress callback altogether, pass NULL as the third
-** argument to this function. {END}
-**
-** {F12918} If the progress callback returns a result other than 0, then
-** the current query is immediately terminated and any database changes
-** rolled back. {F12919}
-** The containing [sqlite3_exec()], [sqlite3_step()], or
-** [sqlite3_get_table()] call returns SQLITE_INTERRUPT. {END}  This feature
-** can be used, for example, to implement the "Cancel" button on a
-** progress dialog box in a GUI.
+** If the progress callback returns non-zero, the operation is
+** interrupted.  This feature can be used to implement a
+** "Cancel" button on a GUI dialog box.
+**
+** INVARIANTS:
+**
+** {H12911} The callback function registered by sqlite3_progress_handler()
+**          is invoked periodically during long running calls to
+**          [sqlite3_step()].
+**
+** {H12912} The progress callback is invoked once for every N virtual
+**          machine opcodes, where N is the second argument to
+**          the [sqlite3_progress_handler()] call that registered
+**          the callback.  If N is less than 1, sqlite3_progress_handler()
+**          acts as if a NULL progress handler had been specified.
+**
+** {H12913} The progress callback itself is identified by the third
+**          argument to sqlite3_progress_handler().
+**
+** {H12914} The fourth argument to sqlite3_progress_handler() is a
+**          void pointer passed to the progress callback
+**          function each time it is invoked.
+**
+** {H12915} If a call to [sqlite3_step()] results in fewer than N opcodes
+**          being executed, then the progress callback is never invoked.
+**
+** {H12916} Every call to [sqlite3_progress_handler()]
+**          overwrites any previously registered progress handler.
+**
+** {H12917} If the progress handler callback is NULL then no progress
+**          handler is invoked.
+**
+** {H12918} If the progress callback returns a result other than 0, then
+**          the behavior is a if [sqlite3_interrupt()] had been called.
+**          
 */
 void sqlite3_progress_handler(sqlite3*, int, int(*)(void*), void*);
 
 /*
-** CAPI3REF: Opening A New Database Connection {F12700}
-**
-** {F12701} These routines open an SQLite database file whose name
-** is given by the filename argument.
-** {F12702} The filename argument is interpreted as UTF-8
-** for [sqlite3_open()] and [sqlite3_open_v2()] and as UTF-16
-** in the native byte order for [sqlite3_open16()].
-** {F12703} An [sqlite3*] handle is returned in *ppDb, even
-** if an error occurs.  {F12723} (Exception: if SQLite is unable
-** to allocate memory to hold the [sqlite3] object, a NULL will
-** be written into *ppDb instead of a pointer to the [sqlite3] object.)
-** {F12704} If the database is opened (and/or created)
-** successfully, then [SQLITE_OK] is returned.  {F12705} Otherwise an
-** error code is returned.  {F12706} The
-** [sqlite3_errmsg()] or [sqlite3_errmsg16()]  routines can be used to obtain
+** CAPI3REF: Opening A New Database Connection {H12700} 
+**
+** These routines open an SQLite database file whose name is given by the
+** filename argument. The filename argument is interpreted as UTF-8 for
+** sqlite3_open() and sqlite3_open_v2() and as UTF-16 in the native byte
+** order for sqlite3_open16(). A [database connection] handle is usually
+** returned in *ppDb, even if an error occurs.  The only exception is that
+** if SQLite is unable to allocate memory to hold the [sqlite3] object,
+** a NULL will be written into *ppDb instead of a pointer to the [sqlite3]
+** object. If the database is opened (and/or created) successfully, then
+** [SQLITE_OK] is returned.  Otherwise an [error code] is returned.  The
+** [sqlite3_errmsg()] or [sqlite3_errmsg16()] routines can be used to obtain
 ** an English language description of the error.
 **
-** {F12707} The default encoding for the database will be UTF-8 if
-** [sqlite3_open()] or [sqlite3_open_v2()] is called and
-** UTF-16 in the native byte order if [sqlite3_open16()] is used.
-**
-** {F12708} Whether or not an error occurs when it is opened, resources
-** associated with the [sqlite3*] handle should be released by passing it
-** to [sqlite3_close()] when it is no longer required.
-**
-** {F12709} The [sqlite3_open_v2()] interface works like [sqlite3_open()] 
-** except that it acccepts two additional parameters for additional control
-** over the new database connection.  {F12710} The flags parameter can be
-** one of:
-**
-** 
    
-** 
  1.   [SQLITE_OPEN_READONLY]
-** 
  2.   [SQLITE_OPEN_READWRITE]
-** 
  3.   [SQLITE_OPEN_READWRITE] | [SQLITE_OPEN_CREATE]
-** 

-**
-** {F12711} The first value opens the database read-only. 
-** {F12712} If the database does not previously exist, an error is returned.
-** {F12713} The second option opens
-** the database for reading and writing if possible, or reading only if
-** if the file is write protected.  {F12714} In either case the database
-** must already exist or an error is returned.  {F12715} The third option
-** opens the database for reading and writing and creates it if it does
-** not already exist. {F12716}
-** The third options is behavior that is always used for [sqlite3_open()]
-** and [sqlite3_open16()].
-**
-** {F12717} If the filename is ":memory:", then an private
-** in-memory database is created for the connection. {F12718} This in-memory
-** database will vanish when the database connection is closed. {END}  Future
-** version of SQLite might make use of additional special filenames
-** that begin with the ":" character.  It is recommended that 
-** when a database filename really does begin with
-** ":" that you prefix the filename with a pathname like "./" to
-** avoid ambiguity.
-**
-** {F12719} If the filename is an empty string, then a private temporary
-** on-disk database will be created.  {F12720} This private database will be
+** The default encoding for the database will be UTF-8 if
+** sqlite3_open() or sqlite3_open_v2() is called and
+** UTF-16 in the native byte order if sqlite3_open16() is used.
+**
+** Whether or not an error occurs when it is opened, resources
+** associated with the [database connection] handle should be released by
+** passing it to [sqlite3_close()] when it is no longer required.
+**
+** The sqlite3_open_v2() interface works like sqlite3_open()
+** except that it accepts two additional parameters for additional control
+** over the new database connection.  The flags parameter can take one of
+** the following three values, optionally combined with the 
+** [SQLITE_OPEN_NOMUTEX] flag:
+**
+** 

+** 
[SQLITE_OPEN_READONLY]

+** 
The database is opened in read-only mode.  If the database does not
+** already exist, an error is returned.

+**
+** 
[SQLITE_OPEN_READWRITE]

+** 
The database is opened for reading and writing if possible, or reading
+** only if the file is write protected by the operating system.  In either
+** case the database must already exist, otherwise an error is returned.

+**
+** 
[SQLITE_OPEN_READWRITE] | [SQLITE_OPEN_CREATE]

+** 
The database is opened for reading and writing, and is creates it if
+** it does not already exist. This is the behavior that is always used for
+** sqlite3_open() and sqlite3_open16().

+** 

+**
+** If the 3rd parameter to sqlite3_open_v2() is not one of the
+** combinations shown above or one of the combinations shown above combined
+** with the [SQLITE_OPEN_NOMUTEX] flag, then the behavior is undefined.
+**
+** If the [SQLITE_OPEN_NOMUTEX] flag is set, then mutexes on the
+** opened [database connection] are disabled and the appliation must
+** insure that access to the [database connection] and its associated
+** [prepared statements] is serialized.  The [SQLITE_OPEN_NOMUTEX] flag
+** is the default behavior is SQLite is configured using the
+** [SQLITE_CONFIG_MULTITHREAD] or [SQLITE_CONFIG_SINGLETHREAD] options
+** to [sqlite3_config()].  The [SQLITE_OPEN_NOMUTEX] flag only makes a
+** difference when SQLite is in its default [SQLITE_CONFIG_SERIALIZED] mode.
+**
+** If the filename is ":memory:", then a private, temporary in-memory database
+** is created for the connection.  This in-memory database will vanish when
+** the database connection is closed.  Future versions of SQLite might
+** make use of additional special filenames that begin with the ":" character.
+** It is recommended that when a database filename actually does begin with
+** a ":" character you should prefix the filename with a pathname such as
+** "./" to avoid ambiguity.
+**
+** If the filename is an empty string, then a private, temporary
+** on-disk database will be created.  This private database will be
 ** automatically deleted as soon as the database connection is closed.
 **
-** {F12721} The fourth parameter to sqlite3_open_v2() is the name of the
-** [sqlite3_vfs] object that defines the operating system 
-** interface that the new database connection should use.  {F12722} If the
-** fourth parameter is a NULL pointer then the default [sqlite3_vfs]
-** object is used. {END}
+** The fourth parameter to sqlite3_open_v2() is the name of the
+** [sqlite3_vfs] object that defines the operating system interface that
+** the new database connection should use.  If the fourth parameter is
+** a NULL pointer then the default [sqlite3_vfs] object is used.
 **
-** Note to windows users:  The encoding used for the filename argument
-** of [sqlite3_open()] and [sqlite3_open_v2()] must be UTF-8, not whatever
+** Note to Windows users:  The encoding used for the filename argument
+** of sqlite3_open() and sqlite3_open_v2() must be UTF-8, not whatever
 ** codepage is currently defined.  Filenames containing international
 ** characters must be converted to UTF-8 prior to passing them into
-** [sqlite3_open()] or [sqlite3_open_v2()].
+** sqlite3_open() or sqlite3_open_v2().
+**
+** INVARIANTS:
+**
+** {H12701} The [sqlite3_open()], [sqlite3_open16()], and
+**          [sqlite3_open_v2()] interfaces create a new
+**          [database connection] associated with
+**          the database file given in their first parameter.
+**
+** {H12702} The filename argument is interpreted as UTF-8
+**          for [sqlite3_open()] and [sqlite3_open_v2()] and as UTF-16
+**          in the native byte order for [sqlite3_open16()].
+**
+** {H12703} A successful invocation of [sqlite3_open()], [sqlite3_open16()],
+**          or [sqlite3_open_v2()] writes a pointer to a new
+**          [database connection] into *ppDb.
+**
+** {H12704} The [sqlite3_open()], [sqlite3_open16()], and
+**          [sqlite3_open_v2()] interfaces return [SQLITE_OK] upon success,
+**          or an appropriate [error code] on failure.
+**
+** {H12706} The default text encoding for a new database created using
+**          [sqlite3_open()] or [sqlite3_open_v2()] will be UTF-8.
+**
+** {H12707} The default text encoding for a new database created using
+**          [sqlite3_open16()] will be UTF-16.
+**
+** {H12709} The [sqlite3_open(F,D)] interface is equivalent to
+**          [sqlite3_open_v2(F,D,G,0)] where the G parameter is
+**          [SQLITE_OPEN_READWRITE]|[SQLITE_OPEN_CREATE].
+**
+** {H12711} If the G parameter to [sqlite3_open_v2(F,D,G,V)] contains the
+**          bit value [SQLITE_OPEN_READONLY] then the database is opened
+**          for reading only.
+**
+** {H12712} If the G parameter to [sqlite3_open_v2(F,D,G,V)] contains the
+**          bit value [SQLITE_OPEN_READWRITE] then the database is opened
+**          reading and writing if possible, or for reading only if the
+**          file is write protected by the operating system.
+**
+** {H12713} If the G parameter to [sqlite3_open(v2(F,D,G,V)] omits the
+**          bit value [SQLITE_OPEN_CREATE] and the database does not
+**          previously exist, an error is returned.
+**
+** {H12714} If the G parameter to [sqlite3_open(v2(F,D,G,V)] contains the
+**          bit value [SQLITE_OPEN_CREATE] and the database does not
+**          previously exist, then an attempt is made to create and
+**          initialize the database.
+**
+** {H12717} If the filename argument to [sqlite3_open()], [sqlite3_open16()],
+**          or [sqlite3_open_v2()] is ":memory:", then an private,
+**          ephemeral, in-memory database is created for the connection.
+**          Is SQLITE_OPEN_CREATE|SQLITE_OPEN_READWRITE required
+**          in sqlite3_open_v2()?
+**
+** {H12719} If the filename is NULL or an empty string, then a private,
+**          ephemeral on-disk database will be created.
+**          Is SQLITE_OPEN_CREATE|SQLITE_OPEN_READWRITE required
+**          in sqlite3_open_v2()?
+**
+** {H12721} The [database connection] created by [sqlite3_open_v2(F,D,G,V)]
+**          will use the [sqlite3_vfs] object identified by the V parameter,
+**          or the default [sqlite3_vfs] object if V is a NULL pointer.
+**
+** {H12723} Two [database connections] will share a common cache if both were
+**          opened with the same VFS while [shared cache mode] was enabled and
+**          if both filenames compare equal using memcmp() after having been
+**          processed by the [sqlite3_vfs | xFullPathname] method of the VFS.
 */
 int sqlite3_open(
   const char *filename,   /* Database filename (UTF-8) */
@@ -1570,56 +2494,69 @@ int sqlite3_open_v2(
 );
 
 /*
-** CAPI3REF: Error Codes And Messages {F12800}
-**
-** {F12801} The sqlite3_errcode() interface returns the numeric
-** [SQLITE_OK | result code] or [SQLITE_IOERR_READ | extended result code]
-** for the most recent failed sqlite3_* API call associated
-** with [sqlite3] handle 'db'. {U12802} If a prior API call failed but the
-** most recent API call succeeded, the return value from sqlite3_errcode()
-** is undefined. {END}
-**
-** {F12803} The sqlite3_errmsg() and sqlite3_errmsg16() return English-language
-** text that describes the error, as either UTF8 or UTF16 respectively.
-** {F12804} Memory to hold the error message string is managed internally.
-** {U12805} The 
-** string may be overwritten or deallocated by subsequent calls to SQLite
-** interface functions. {END}
-**
-** {F12806} Calls to many sqlite3_* functions set the error code and
-** string returned by [sqlite3_errcode()], [sqlite3_errmsg()], and
-** [sqlite3_errmsg16()] overwriting the previous values.  {F12807}
-** Except, calls to [sqlite3_errcode()],
-** [sqlite3_errmsg()], and [sqlite3_errmsg16()] themselves do not affect the
-** results of future invocations.  {F12808} Calls to API routines that
-** do not return an error code (example: [sqlite3_data_count()]) do not
-** change the error code returned by this routine.  {F12809} Interfaces that
-** are not associated with a specific database connection (examples:
-** [sqlite3_mprintf()] or [sqlite3_enable_shared_cache()] do not change
-** the return code. {END}
-**
-** {F12810} Assuming no other intervening sqlite3_* API calls are made,
-** the error code returned by this function is associated with the same
-** error as the strings returned by [sqlite3_errmsg()] and [sqlite3_errmsg16()].
+** CAPI3REF: Error Codes And Messages {H12800} 
+**
+** The sqlite3_errcode() interface returns the numeric [result code] or
+** [extended result code] for the most recent failed sqlite3_* API call
+** associated with a [database connection]. If a prior API call failed
+** but the most recent API call succeeded, the return value from
+** sqlite3_errcode() is undefined.
+**
+** The sqlite3_errmsg() and sqlite3_errmsg16() return English-language
+** text that describes the error, as either UTF-8 or UTF-16 respectively.
+** Memory to hold the error message string is managed internally.
+** The application does not need to worry about freeing the result.
+** However, the error string might be overwritten or deallocated by
+** subsequent calls to other SQLite interface functions.
+**
+** If an interface fails with SQLITE_MISUSE, that means the interface
+** was invoked incorrectly by the application.  In that case, the
+** error code and message may or may not be set.
+**
+** INVARIANTS:
+**
+** {H12801} The [sqlite3_errcode(D)] interface returns the numeric
+**          [result code] or [extended result code] for the most recently
+**          failed interface call associated with the [database connection] D.
+**
+** {H12803} The [sqlite3_errmsg(D)] and [sqlite3_errmsg16(D)]
+**          interfaces return English-language text that describes
+**          the error in the mostly recently failed interface call,
+**          encoded as either UTF-8 or UTF-16 respectively.
+**
+** {H12807} The strings returned by [sqlite3_errmsg()] and [sqlite3_errmsg16()]
+**          are valid until the next SQLite interface call.
+**
+** {H12808} Calls to API routines that do not return an error code
+**          (example: [sqlite3_data_count()]) do not
+**          change the error code or message returned by
+**          [sqlite3_errcode()], [sqlite3_errmsg()], or [sqlite3_errmsg16()].
+**
+** {H12809} Interfaces that are not associated with a specific
+**          [database connection] (examples:
+**          [sqlite3_mprintf()] or [sqlite3_enable_shared_cache()]
+**          do not change the values returned by
+**          [sqlite3_errcode()], [sqlite3_errmsg()], or [sqlite3_errmsg16()].
 */
 int sqlite3_errcode(sqlite3 *db);
 const char *sqlite3_errmsg(sqlite3*);
 const void *sqlite3_errmsg16(sqlite3*);
 
 /*
-** CAPI3REF: SQL Statement Object {F13000}
+** CAPI3REF: SQL Statement Object {H13000} 
+** KEYWORDS: {prepared statement} {prepared statements}
 **
-** An instance of this object represent single SQL statements.  This
-** object is variously known as a "prepared statement" or a 
+** An instance of this object represents a single SQL statement.
+** This object is variously known as a "prepared statement" or a
 ** "compiled SQL statement" or simply as a "statement".
-** 
+**
 ** The life of a statement object goes something like this:
 **
 ** 
    
 ** 
  1.  Create the object using [sqlite3_prepare_v2()] or a related
 **      function.
-** 
  2.  Bind values to host parameters using
-**      [sqlite3_bind_blob | sqlite3_bind_* interfaces].
+** 
  3.  Bind values to [host parameters] using the sqlite3_bind_*()
+**      interfaces.
 ** 
  4.  Run the SQL by calling [sqlite3_step()] one or more times.
 ** 
  5.  Reset the statement using [sqlite3_reset()] then go back
 **      to step 2.  Do this zero or more times.
@@ -1632,77 +2569,213 @@ const void *sqlite3_errmsg16(sqlite3*);
 typedef struct sqlite3_stmt sqlite3_stmt;
 
 /*
-** CAPI3REF: Compiling An SQL Statement {F13010}
+** CAPI3REF: Run-time Limits {H12760} 
+**
+** This interface allows the size of various constructs to be limited
+** on a connection by connection basis.  The first parameter is the
+** [database connection] whose limit is to be set or queried.  The
+** second parameter is one of the [limit categories] that define a
+** class of constructs to be size limited.  The third parameter is the
+** new limit for that construct.  The function returns the old limit.
+**
+** If the new limit is a negative number, the limit is unchanged.
+** For the limit category of SQLITE_LIMIT_XYZ there is a hard upper
+** bound set by a compile-time C preprocessor macro named SQLITE_MAX_XYZ.
+** (The "_LIMIT_" in the name is changed to "_MAX_".)
+** Attempts to increase a limit above its hard upper bound are
+** silently truncated to the hard upper limit.
+**
+** Run time limits are intended for use in applications that manage
+** both their own internal database and also databases that are controlled
+** by untrusted external sources.  An example application might be a
+** webbrowser that has its own databases for storing history and
+** separate databases controlled by JavaScript applications downloaded
+** off the Internet.  The internal databases can be given the
+** large, default limits.  Databases managed by external sources can
+** be given much smaller limits designed to prevent a denial of service
+** attack.  Developers might also want to use the [sqlite3_set_authorizer()]
+** interface to further control untrusted SQL.  The size of the database
+** created by an untrusted script can be contained using the
+** [max_page_count] [PRAGMA].
+**
+** New run-time limit categories may be added in future releases.
+**
+** INVARIANTS:
+**
+** {H12762} A successful call to [sqlite3_limit(D,C,V)] where V is
+**          positive changes the limit on the size of construct C in the
+**          [database connection] D to the lesser of V and the hard upper
+**          bound on the size of C that is set at compile-time.
+**
+** {H12766} A successful call to [sqlite3_limit(D,C,V)] where V is negative
+**          leaves the state of the [database connection] D unchanged.
+**
+** {H12769} A successful call to [sqlite3_limit(D,C,V)] returns the
+**          value of the limit on the size of construct C in the
+**          [database connection] D as it was prior to the call.
+*/
+int sqlite3_limit(sqlite3*, int id, int newVal);
+
+/*
+** CAPI3REF: Run-Time Limit Categories {H12790} 
+** KEYWORDS: {limit category} {limit categories}
+**
+** These constants define various aspects of a [database connection]
+** that can be limited in size by calls to [sqlite3_limit()].
+** The meanings of the various limits are as follows:
+**
+** 
    
+** 
    SQLITE_LIMIT_LENGTH
    
+** 
    The maximum size of any string or BLOB or table row.
    
+**
+** 
    SQLITE_LIMIT_SQL_LENGTH
    
+** 
    The maximum length of an SQL statement.
    
+**
+** 
    SQLITE_LIMIT_COLUMN
    
+** 
    The maximum number of columns in a table definition or in the
+** result set of a SELECT or the maximum number of columns in an index
+** or in an ORDER BY or GROUP BY clause.
    
+**
+** 
    SQLITE_LIMIT_EXPR_DEPTH
    
+** 
    The maximum depth of the parse tree on any expression.
    
+**
+** 
    SQLITE_LIMIT_COMPOUND_SELECT
    
+** 
    The maximum number of terms in a compound SELECT statement.
    
+**
+** 
    SQLITE_LIMIT_VDBE_OP
    
+** 
    The maximum number of instructions in a virtual machine program
+** used to implement an SQL statement.
    
+**
+** 
    SQLITE_LIMIT_FUNCTION_ARG
    
+** 
    The maximum number of arguments on a function.
    
+**
+** 
    SQLITE_LIMIT_ATTACHED
    
+** 
    The maximum number of attached databases.
    
+**
+** 
    SQLITE_LIMIT_LIKE_PATTERN_LENGTH
    
+** 
    The maximum length of the pattern argument to the LIKE or
+** GLOB operators.
    
+**
+** 
    SQLITE_LIMIT_VARIABLE_NUMBER
    
+** 
    The maximum number of variables in an SQL statement that can
+** be bound.
    
+** 
    
+*/
+#define SQLITE_LIMIT_LENGTH                    0
+#define SQLITE_LIMIT_SQL_LENGTH                1
+#define SQLITE_LIMIT_COLUMN                    2
+#define SQLITE_LIMIT_EXPR_DEPTH                3
+#define SQLITE_LIMIT_COMPOUND_SELECT           4
+#define SQLITE_LIMIT_VDBE_OP                   5
+#define SQLITE_LIMIT_FUNCTION_ARG              6
+#define SQLITE_LIMIT_ATTACHED                  7
+#define SQLITE_LIMIT_LIKE_PATTERN_LENGTH       8
+#define SQLITE_LIMIT_VARIABLE_NUMBER           9
+
+/*
+** CAPI3REF: Compiling An SQL Statement {H13010} 
+** KEYWORDS: {SQL statement compiler}
 **
 ** To execute an SQL query, it must first be compiled into a byte-code
-** program using one of these routines. 
+** program using one of these routines.
+**
+** The first argument, "db", is a [database connection] obtained from a
+** prior call to [sqlite3_open()], [sqlite3_open_v2()] or [sqlite3_open16()].
 **
-** {F13011} The first argument "db" is an [sqlite3 | SQLite database handle] 
-** obtained from a prior call to [sqlite3_open()], [sqlite3_open_v2()]
-** or [sqlite3_open16()]. {F13012}
-** The second argument "zSql" is the statement to be compiled, encoded
+** The second argument, "zSql", is the statement to be compiled, encoded
 ** as either UTF-8 or UTF-16.  The sqlite3_prepare() and sqlite3_prepare_v2()
-** interfaces uses UTF-8 and sqlite3_prepare16() and sqlite3_prepare16_v2()
-** use UTF-16. {END}
-**
-** {F13013} If the nByte argument is less
-** than zero, then zSql is read up to the first zero terminator.
-** {F13014} If nByte is non-negative, then it is the maximum number of 
-** bytes read from zSql.  When nByte is non-negative, the
-** zSql string ends at either the first '\000' or '\u0000' character or 
-** until the nByte-th byte, whichever comes first. {END}
-**
-** {F13015} *pzTail is made to point to the first byte past the end of the
-** first SQL statement in zSql.  These routines only compiles the first
+** interfaces use UTF-8, and sqlite3_prepare16() and sqlite3_prepare16_v2()
+** use UTF-16.
+**
+** If the nByte argument is less than zero, then zSql is read up to the
+** first zero terminator. If nByte is non-negative, then it is the maximum
+** number of  bytes read from zSql.  When nByte is non-negative, the
+** zSql string ends at either the first '\000' or '\u0000' character or
+** the nByte-th byte, whichever comes first. If the caller knows
+** that the supplied string is nul-terminated, then there is a small
+** performance advantage to be gained by passing an nByte parameter that
+** is equal to the number of bytes in the input string including
+** the nul-terminator bytes.
+**
+** *pzTail is made to point to the first byte past the end of the
+** first SQL statement in zSql.  These routines only compile the first
 ** statement in zSql, so *pzTail is left pointing to what remains
-** uncompiled. {END}
+** uncompiled.
 **
-** {F13016} *ppStmt is left pointing to a compiled 
-** [sqlite3_stmt | SQL statement structure] that can be
-** executed using [sqlite3_step()].  Or if there is an error, *ppStmt may be
-** set to NULL.  {F13017} If the input text contains no SQL (if the input
-** is and empty string or a comment) then *ppStmt is set to NULL.
-** {U13018} The calling procedure is responsible for deleting the
-** compiled SQL statement
-** using [sqlite3_finalize()] after it has finished with it.
+** *ppStmt is left pointing to a compiled [prepared statement] that can be
+** executed using [sqlite3_step()].  If there is an error, *ppStmt is set
+** to NULL.  If the input text contains no SQL (if the input is an empty
+** string or a comment) then *ppStmt is set to NULL.
+** {A13018} The calling procedure is responsible for deleting the compiled
+** SQL statement using [sqlite3_finalize()] after it has finished with it.
 **
-** {F13019} On success, [SQLITE_OK] is returned.  Otherwise an 
-** [SQLITE_ERROR | error code] is returned. {END}
+** On success, [SQLITE_OK] is returned, otherwise an [error code] is returned.
 **
 ** The sqlite3_prepare_v2() and sqlite3_prepare16_v2() interfaces are
 ** recommended for all new programs. The two older interfaces are retained
 ** for backwards compatibility, but their use is discouraged.
-** {F13020} In the "v2" interfaces, the prepared statement
-** that is returned (the [sqlite3_stmt] object) contains a copy of the 
-** original SQL text. {END} This causes the [sqlite3_step()] interface to
+** In the "v2" interfaces, the prepared statement
+** that is returned (the [sqlite3_stmt] object) contains a copy of the
+** original SQL text. This causes the [sqlite3_step()] interface to
 ** behave a differently in two ways:
 **
 ** 
      
-** 
    1. {F13022}
+** 
    2. 
 ** If the database schema changes, instead of returning [SQLITE_SCHEMA] as it
 ** always used to do, [sqlite3_step()] will automatically recompile the SQL
-** statement and try to run it again. {F12023} If the schema has changed in
+** statement and try to run it again.  If the schema has changed in
 ** a way that makes the statement no longer valid, [sqlite3_step()] will still
-** return [SQLITE_SCHEMA].  {END} But unlike the legacy behavior, 
-** [SQLITE_SCHEMA] is now a fatal error.  {F12024} Calling
-** [sqlite3_prepare_v2()] again will not make the
-** error go away.  {F12025} Note: use [sqlite3_errmsg()] to find the text
-** of the parsing error that results in an [SQLITE_SCHEMA] return. {END}
+** return [SQLITE_SCHEMA].  But unlike the legacy behavior, [SQLITE_SCHEMA] is
+** now a fatal error.  Calling [sqlite3_prepare_v2()] again will not make the
+** error go away.  Note: use [sqlite3_errmsg()] to find the text
+** of the parsing error that results in an [SQLITE_SCHEMA] return.
 ** 
      3. 
 **
 ** 
    3. 
-** {F13030} When an error occurs, 
-** [sqlite3_step()] will return one of the detailed 
-** [SQLITE_ERROR | result codes] or
-** [SQLITE_IOERR_READ | extended result codes].  {F13031}
-** The legacy behavior was that [sqlite3_step()] would only return a generic
-** [SQLITE_ERROR] result code and you would have to make a second call to
-** [sqlite3_reset()] in order to find the underlying cause of the problem.
-** {F13032}
-** With the "v2" prepare interfaces, the underlying reason for the error is
-** returned immediately. {END}
+** When an error occurs, [sqlite3_step()] will return one of the detailed
+** [error codes] or [extended error codes].  The legacy behavior was that
+** [sqlite3_step()] would only return a generic [SQLITE_ERROR] result code
+** and you would have to make a second call to [sqlite3_reset()] in order
+** to find the underlying cause of the problem. With the "v2" prepare
+** interfaces, the underlying reason for the error is returned immediately.
 ** 
      4. 
 ** 
    
+**
+** INVARIANTS:
+**
+** {H13011} The [sqlite3_prepare(db,zSql,...)] and
+**          [sqlite3_prepare_v2(db,zSql,...)] interfaces interpret the
+**          text in their zSql parameter as UTF-8.
+**
+** {H13012} The [sqlite3_prepare16(db,zSql,...)] and
+**          [sqlite3_prepare16_v2(db,zSql,...)] interfaces interpret the
+**          text in their zSql parameter as UTF-16 in the native byte order.
+**
+** {H13013} If the nByte argument to [sqlite3_prepare_v2(db,zSql,nByte,...)]
+**          and its variants is less than zero, the SQL text is
+**          read from zSql is read up to the first zero terminator.
+**
+** {H13014} If the nByte argument to [sqlite3_prepare_v2(db,zSql,nByte,...)]
+**          and its variants is non-negative, then at most nBytes bytes of
+**          SQL text is read from zSql.
+**
+** {H13015} In [sqlite3_prepare_v2(db,zSql,N,P,pzTail)] and its variants
+**          if the zSql input text contains more than one SQL statement
+**          and pzTail is not NULL, then *pzTail is made to point to the
+**          first byte past the end of the first SQL statement in zSql.
+**          What does *pzTail point to if there is one statement?
+**
+** {H13016} A successful call to [sqlite3_prepare_v2(db,zSql,N,ppStmt,...)]
+**          or one of its variants writes into *ppStmt a pointer to a new
+**          [prepared statement] or a pointer to NULL if zSql contains
+**          nothing other than whitespace or comments.
+**
+** {H13019} The [sqlite3_prepare_v2()] interface and its variants return
+**          [SQLITE_OK] or an appropriate [error code] upon failure.
+**
+** {H13021} Before [sqlite3_prepare(db,zSql,nByte,ppStmt,pzTail)] or its
+**          variants returns an error (any value other than [SQLITE_OK]),
+**          they first set *ppStmt to NULL.
 */
 int sqlite3_prepare(
   sqlite3 *db,            /* Database handle */
@@ -1734,119 +2807,234 @@ int sqlite3_prepare16_v2(
 );
 
 /*
-** CAPIREF: Retrieving Statement SQL {F13100}
+** CAPIREF: Retrieving Statement SQL {H13100} 
+**
+** This interface can be used to retrieve a saved copy of the original
+** SQL text used to create a [prepared statement] if that statement was
+** compiled using either [sqlite3_prepare_v2()] or [sqlite3_prepare16_v2()].
+**
+** INVARIANTS:
+**
+** {H13101} If the [prepared statement] passed as the argument to
+**          [sqlite3_sql()] was compiled using either [sqlite3_prepare_v2()] or
+**          [sqlite3_prepare16_v2()], then [sqlite3_sql()] returns
+**          a pointer to a zero-terminated string containing a UTF-8 rendering
+**          of the original SQL statement.
 **
-** {F13101} If the compiled SQL statement passed as an argument was
-** compiled using either [sqlite3_prepare_v2()] or [sqlite3_prepare16_v2()],
-** then this function returns a pointer to a zero-terminated string
-** containing a copy of the original SQL statement. {F13102} The
-** pointer is valid until the statement
-** is deleted using sqlite3_finalize().
-** {F13103} The string returned by sqlite3_sql() is always UTF8 even
-** if a UTF16 string was originally entered using [sqlite3_prepare16_v2()]
-** or the equivalent.
+** {H13102} If the [prepared statement] passed as the argument to
+**          [sqlite3_sql()] was compiled using either [sqlite3_prepare()] or
+**          [sqlite3_prepare16()], then [sqlite3_sql()] returns a NULL pointer.
 **
-** {F13104} If the statement was compiled using either of the legacy
-** interfaces [sqlite3_prepare()] or [sqlite3_prepare16()], this
-** function returns NULL.
+** {H13103} The string returned by [sqlite3_sql(S)] is valid until the
+**          [prepared statement] S is deleted using [sqlite3_finalize(S)].
 */
 const char *sqlite3_sql(sqlite3_stmt *pStmt);
 
 /*
-** CAPI3REF:  Dynamically Typed Value Object  {F15000}
-**
-** {F15001} SQLite uses the sqlite3_value object to represent all values
-** that are or can be stored in a database table. {END}
-** SQLite uses dynamic typing for the values it stores.  
-** {F15002} Values stored in sqlite3_value objects can be
-** be integers, floating point values, strings, BLOBs, or NULL.
+** CAPI3REF: Dynamically Typed Value Object {H15000} 
+** KEYWORDS: {protected sqlite3_value} {unprotected sqlite3_value}
+**
+** SQLite uses the sqlite3_value object to represent all values
+** that can be stored in a database table. SQLite uses dynamic typing
+** for the values it stores. Values stored in sqlite3_value objects
+** can be integers, floating point values, strings, BLOBs, or NULL.
+**
+** An sqlite3_value object may be either "protected" or "unprotected".
+** Some interfaces require a protected sqlite3_value.  Other interfaces
+** will accept either a protected or an unprotected sqlite3_value.
+** Every interface that accepts sqlite3_value arguments specifies
+** whether or not it requires a protected sqlite3_value.
+**
+** The terms "protected" and "unprotected" refer to whether or not
+** a mutex is held.  A internal mutex is held for a protected
+** sqlite3_value object but no mutex is held for an unprotected
+** sqlite3_value object.  If SQLite is compiled to be single-threaded
+** (with [SQLITE_THREADSAFE=0] and with [sqlite3_threadsafe()] returning 0)
+** or if SQLite is run in one of reduced mutex modes 
+** [SQLITE_CONFIG_SINGLETHREAD] or [SQLITE_CONFIG_MULTITHREAD]
+** then there is no distinction between protected and unprotected
+** sqlite3_value objects and they can be used interchangeably.  However,
+** for maximum code portability it is recommended that applications
+** still make the distinction between between protected and unprotected
+** sqlite3_value objects even when not strictly required.
+**
+** The sqlite3_value objects that are passed as parameters into the
+** implementation of [application-defined SQL functions] are protected.
+** The sqlite3_value object returned by
+** [sqlite3_column_value()] is unprotected.
+** Unprotected sqlite3_value objects may only be used with
+** [sqlite3_result_value()] and [sqlite3_bind_value()].
+** The [sqlite3_value_blob | sqlite3_value_type()] family of
+** interfaces require protected sqlite3_value objects.
 */
 typedef struct Mem sqlite3_value;
 
 /*
-** CAPI3REF:  SQL Function Context Object {F16001}
+** CAPI3REF: SQL Function Context Object {H16001} 
 **
 ** The context in which an SQL function executes is stored in an
-** sqlite3_context object.  {F16002} A pointer to an sqlite3_context
-** object is always first parameter to application-defined SQL functions.
+** sqlite3_context object.  A pointer to an sqlite3_context object
+** is always first parameter to [application-defined SQL functions].
+** The application-defined SQL function implementation will pass this
+** pointer through into calls to [sqlite3_result_int | sqlite3_result()],
+** [sqlite3_aggregate_context()], [sqlite3_user_data()],
+** [sqlite3_context_db_handle()], [sqlite3_get_auxdata()],
+** and/or [sqlite3_set_auxdata()].
 */
 typedef struct sqlite3_context sqlite3_context;
 
 /*
-** CAPI3REF:  Binding Values To Prepared Statements {F13500}
+** CAPI3REF: Binding Values To Prepared Statements {H13500} 
+** KEYWORDS: {host parameter} {host parameters} {host parameter name}
+** KEYWORDS: {SQL parameter} {SQL parameters} {parameter binding}
 **
-** {F13501} In the SQL strings input to [sqlite3_prepare_v2()] and its
-** variants, literals may be replace by a parameter in one
-** of these forms:
+** In the SQL strings input to [sqlite3_prepare_v2()] and its variants,
+** literals may be replaced by a parameter in one of these forms:
 **
 ** 
      
 ** 
    •   ?
 ** 
    •   ?NNN
-** 
    •   :AAA
-** 
    •   @AAA
+** 
    •   :VVV
+** 
    •   @VVV
 ** 
    •   $VVV
 ** 
    
 **
 ** In the parameter forms shown above NNN is an integer literal,
-** AAA is an alphanumeric identifier and VVV is a variable name according
-** to the syntax rules of the TCL programming language. {END}
-** The values of these parameters (also called "host parameter names")
+** and VVV is an alpha-numeric parameter name. The values of these
+** parameters (also called "host parameter names" or "SQL parameters")
 ** can be set using the sqlite3_bind_*() routines defined here.
 **
-** {F13502} The first argument to the sqlite3_bind_*() routines always
-** is a pointer to the [sqlite3_stmt] object returned from
-** [sqlite3_prepare_v2()] or its variants.  {F13503} The second
-** argument is the index of the parameter to be set.  {F13504} The
-** first parameter has an index of 1.  {F13505} When the same named
-** parameter is used more than once, second and subsequent
-** occurrences have the same index as the first occurrence. 
-** {F13506} The index for named parameters can be looked up using the
-** [sqlite3_bind_parameter_name()] API if desired.  {F13507} The index
+** The first argument to the sqlite3_bind_*() routines is always
+** a pointer to the [sqlite3_stmt] object returned from
+** [sqlite3_prepare_v2()] or its variants.
+**
+** The second argument is the index of the SQL parameter to be set.
+** The leftmost SQL parameter has an index of 1.  When the same named
+** SQL parameter is used more than once, second and subsequent
+** occurrences have the same index as the first occurrence.
+** The index for named parameters can be looked up using the
+** [sqlite3_bind_parameter_index()] API if desired.  The index
 ** for "?NNN" parameters is the value of NNN.
-** {F13508} The NNN value must be between 1 and the compile-time
-** parameter SQLITE_MAX_VARIABLE_NUMBER (default value: 999). {END}
-** See limits.html for additional information.
-**
-** {F13509} The third argument is the value to bind to the parameter. {END}
-**
-** {F13510} In those
-** routines that have a fourth argument, its value is the number of bytes
-** in the parameter.  To be clear: the value is the number of bytes in the
-** string, not the number of characters. {F13511}  The number
-** of bytes does not include the zero-terminator at the end of strings.
-** {F13512}
+** The NNN value must be between 1 and the [sqlite3_limit()]
+** parameter [SQLITE_LIMIT_VARIABLE_NUMBER] (default value: 999).
+**
+** The third argument is the value to bind to the parameter.
+**
+** In those routines that have a fourth argument, its value is the
+** number of bytes in the parameter.  To be clear: the value is the
+** number of bytes in the value, not the number of characters.
 ** If the fourth parameter is negative, the length of the string is
-** number of bytes up to the first zero terminator. {END}
+** the number of bytes up to the first zero terminator.
 **
-** {F13513}
 ** The fifth argument to sqlite3_bind_blob(), sqlite3_bind_text(), and
 ** sqlite3_bind_text16() is a destructor used to dispose of the BLOB or
-** text after SQLite has finished with it. {F13514} If the fifth argument is
-** the special value [SQLITE_STATIC], then the library assumes that the
+** string after SQLite has finished with it. If the fifth argument is
+** the special value [SQLITE_STATIC], then SQLite assumes that the
 ** information is in static, unmanaged space and does not need to be freed.
-** {F13515} If the fifth argument has the value [SQLITE_TRANSIENT], then
+** If the fifth argument has the value [SQLITE_TRANSIENT], then
 ** SQLite makes its own private copy of the data immediately, before
-** the sqlite3_bind_*() routine returns. {END}
+** the sqlite3_bind_*() routine returns.
 **
-** {F13520} The sqlite3_bind_zeroblob() routine binds a BLOB of length N that
-** is filled with zeros.  {F13521} A zeroblob uses a fixed amount of memory
-** (just an integer to hold it size) while it is being processed. {END}
-** Zeroblobs are intended to serve as place-holders for BLOBs whose
-** content is later written using 
-** [sqlite3_blob_open | increment BLOB I/O] routines. {F13522} A negative
-** value for the zeroblob results in a zero-length BLOB. {END}
+** The sqlite3_bind_zeroblob() routine binds a BLOB of length N that
+** is filled with zeroes.  A zeroblob uses a fixed amount of memory
+** (just an integer to hold its size) while it is being processed.
+** Zeroblobs are intended to serve as placeholders for BLOBs whose
+** content is later written using
+** [sqlite3_blob_open | incremental BLOB I/O] routines.
+** A negative value for the zeroblob results in a zero-length BLOB.
 **
-** {F13530} The sqlite3_bind_*() routines must be called after
+** The sqlite3_bind_*() routines must be called after
 ** [sqlite3_prepare_v2()] (and its variants) or [sqlite3_reset()] and
-** before [sqlite3_step()]. {F13531}
+** before [sqlite3_step()].
 ** Bindings are not cleared by the [sqlite3_reset()] routine.
-** {F13532} Unbound parameters are interpreted as NULL. {END}
+** Unbound parameters are interpreted as NULL.
 **
-** {F13540} These routines return [SQLITE_OK] on success or an error code if
-** anything goes wrong.  {F13541} [SQLITE_RANGE] is returned if the parameter
-** index is out of range.  {F13542} [SQLITE_NOMEM] is returned if malloc fails.
-** {F13543} [SQLITE_MISUSE] is returned if these routines are called on a
+** These routines return [SQLITE_OK] on success or an error code if
+** anything goes wrong.  [SQLITE_RANGE] is returned if the parameter
+** index is out of range.  [SQLITE_NOMEM] is returned if malloc() fails.
+** [SQLITE_MISUSE] might be returned if these routines are called on a
 ** virtual machine that is the wrong state or which has already been finalized.
+** Detection of misuse is unreliable.  Applications should not depend
+** on SQLITE_MISUSE returns.  SQLITE_MISUSE is intended to indicate a
+** a logic error in the application.  Future versions of SQLite might
+** panic rather than return SQLITE_MISUSE.
+**
+** See also: [sqlite3_bind_parameter_count()],
+** [sqlite3_bind_parameter_name()], and [sqlite3_bind_parameter_index()].
+**
+** INVARIANTS:
+**
+** {H13506} The [SQL statement compiler] recognizes tokens of the forms
+**          "?", "?NNN", "$VVV", ":VVV", and "@VVV" as SQL parameters,
+**          where NNN is any sequence of one or more digits
+**          and where VVV is any sequence of one or more alphanumeric
+**          characters or "::" optionally followed by a string containing
+**          no spaces and contained within parentheses.
+**
+** {H13509} The initial value of an SQL parameter is NULL.
+**
+** {H13512} The index of an "?" SQL parameter is one larger than the
+**          largest index of SQL parameter to the left, or 1 if
+**          the "?" is the leftmost SQL parameter.
+**
+** {H13515} The index of an "?NNN" SQL parameter is the integer NNN.
+**
+** {H13518} The index of an ":VVV", "$VVV", or "@VVV" SQL parameter is
+**          the same as the index of leftmost occurrences of the same
+**          parameter, or one more than the largest index over all
+**          parameters to the left if this is the first occurrence
+**          of this parameter, or 1 if this is the leftmost parameter.
+**
+** {H13521} The [SQL statement compiler] fails with an [SQLITE_RANGE]
+**          error if the index of an SQL parameter is less than 1
+**          or greater than the compile-time SQLITE_MAX_VARIABLE_NUMBER
+**          parameter.
+**
+** {H13524} Calls to [sqlite3_bind_text | sqlite3_bind(S,N,V,...)]
+**          associate the value V with all SQL parameters having an
+**          index of N in the [prepared statement] S.
+**
+** {H13527} Calls to [sqlite3_bind_text | sqlite3_bind(S,N,...)]
+**          override prior calls with the same values of S and N.
+**
+** {H13530} Bindings established by [sqlite3_bind_text | sqlite3_bind(S,...)]
+**          persist across calls to [sqlite3_reset(S)].
+**
+** {H13533} In calls to [sqlite3_bind_blob(S,N,V,L,D)],
+**          [sqlite3_bind_text(S,N,V,L,D)], or
+**          [sqlite3_bind_text16(S,N,V,L,D)] SQLite binds the first L
+**          bytes of the BLOB or string pointed to by V, when L
+**          is non-negative.
+**
+** {H13536} In calls to [sqlite3_bind_text(S,N,V,L,D)] or
+**          [sqlite3_bind_text16(S,N,V,L,D)] SQLite binds characters
+**          from V through the first zero character when L is negative.
+**
+** {H13539} In calls to [sqlite3_bind_blob(S,N,V,L,D)],
+**          [sqlite3_bind_text(S,N,V,L,D)], or
+**          [sqlite3_bind_text16(S,N,V,L,D)] when D is the special
+**          constant [SQLITE_STATIC], SQLite assumes that the value V
+**          is held in static unmanaged space that will not change
+**          during the lifetime of the binding.
+**
+** {H13542} In calls to [sqlite3_bind_blob(S,N,V,L,D)],
+**          [sqlite3_bind_text(S,N,V,L,D)], or
+**          [sqlite3_bind_text16(S,N,V,L,D)] when D is the special
+**          constant [SQLITE_TRANSIENT], the routine makes a
+**          private copy of the value V before it returns.
+**
+** {H13545} In calls to [sqlite3_bind_blob(S,N,V,L,D)],
+**          [sqlite3_bind_text(S,N,V,L,D)], or
+**          [sqlite3_bind_text16(S,N,V,L,D)] when D is a pointer to
+**          a function, SQLite invokes that function to destroy the
+**          value V after it has finished using the value V.
+**
+** {H13548} In calls to [sqlite3_bind_zeroblob(S,N,V,L)] the value bound
+**          is a BLOB of L bytes, or a zero-length BLOB if L is negative.
+**
+** {H13551} In calls to [sqlite3_bind_value(S,N,V)] the V argument may
+**          be either a [protected sqlite3_value] object or an
+**          [unprotected sqlite3_value] object.
 */
 int sqlite3_bind_blob(sqlite3_stmt*, int, const void*, int n, void(*)(void*));
 int sqlite3_bind_double(sqlite3_stmt*, int, double);
@@ -1859,140 +3047,263 @@ int sqlite3_bind_value(sqlite3_stmt*, int, const sqlite3_value*);
 int sqlite3_bind_zeroblob(sqlite3_stmt*, int, int n);
 
 /*
-** CAPI3REF: Number Of Host Parameters {F13600}
+** CAPI3REF: Number Of SQL Parameters {H13600} 
 **
-** {F13601} Return the largest host parameter index in the precompiled
-** statement given as the argument. {F13602} When the host parameters
-** are of the forms like ":AAA", "$VVV", "@AAA", or "?",
-** then they are assigned sequential increasing numbers beginning
-** with one, so the value returned is the number of parameters.
-** {F13603} However
-** if the same host parameter name is used multiple times, each occurrance
-** is given the same number, so the value returned in that case is the number
-** of unique host parameter names. {F13604} If host parameters of the
-** form "?NNN" are used (where NNN is an integer) then there might be
-** gaps in the numbering and the value returned by this interface is
-** the index of the host parameter with the largest index value. {END}
+** This routine can be used to find the number of [SQL parameters]
+** in a [prepared statement].  SQL parameters are tokens of the
+** form "?", "?NNN", ":AAA", "$AAA", or "@AAA" that serve as
+** placeholders for values that are [sqlite3_bind_blob | bound]
+** to the parameters at a later time.
 **
-** {U13605} The prepared statement must not be [sqlite3_finalize | finalized]
-** prior to this routine returning.  Otherwise the results are undefined
-** and probably undesirable.
+** This routine actually returns the index of the largest (rightmost)
+** parameter. For all forms except ?NNN, this will correspond to the
+** number of unique parameters.  If parameters of the ?NNN are used,
+** there may be gaps in the list.
+**
+** See also: [sqlite3_bind_blob|sqlite3_bind()],
+** [sqlite3_bind_parameter_name()], and
+** [sqlite3_bind_parameter_index()].
+**
+** INVARIANTS:
+**
+** {H13601} The [sqlite3_bind_parameter_count(S)] interface returns
+**          the largest index of all SQL parameters in the
+**          [prepared statement] S, or 0 if S contains no SQL parameters.
 */
 int sqlite3_bind_parameter_count(sqlite3_stmt*);
 
 /*
-** CAPI3REF: Name Of A Host Parameter {F13620}
+** CAPI3REF: Name Of A Host Parameter {H13620} 
+**
+** This routine returns a pointer to the name of the n-th
+** [SQL parameter] in a [prepared statement].
+** SQL parameters of the form "?NNN" or ":AAA" or "@AAA" or "$AAA"
+** have a name which is the string "?NNN" or ":AAA" or "@AAA" or "$AAA"
+** respectively.
+** In other words, the initial ":" or "$" or "@" or "?"
+** is included as part of the name.
+** Parameters of the form "?" without a following integer have no name
+** and are also referred to as "anonymous parameters".
+**
+** The first host parameter has an index of 1, not 0.
+**
+** If the value n is out of range or if the n-th parameter is
+** nameless, then NULL is returned.  The returned string is
+** always in UTF-8 encoding even if the named parameter was
+** originally specified as UTF-16 in [sqlite3_prepare16()] or
+** [sqlite3_prepare16_v2()].
 **
-** {F13621} This routine returns a pointer to the name of the n-th
-** parameter in a [sqlite3_stmt | prepared statement]. {F13622}
-** Host parameters of the form ":AAA" or "@AAA" or "$VVV" have a name
-** which is the string ":AAA" or "@AAA" or "$VVV". 
-** In other words, the initial ":" or "$" or "@"
-** is included as part of the name.  {F13626}
-** Parameters of the form "?" or "?NNN" have no name.
+** See also: [sqlite3_bind_blob|sqlite3_bind()],
+** [sqlite3_bind_parameter_count()], and
+** [sqlite3_bind_parameter_index()].
 **
-** {F13623} The first host parameter has an index of 1, not 0.
+** INVARIANTS:
 **
-** {F13624} If the value n is out of range or if the n-th parameter is
-** nameless, then NULL is returned.  {F13625} The returned string is
-** always in the UTF-8 encoding even if the named parameter was
-** originally specified as UTF-16 in [sqlite3_prepare16()] or
-** [sqlite3_prepare16_v2()].
+** {H13621} The [sqlite3_bind_parameter_name(S,N)] interface returns
+**          a UTF-8 rendering of the name of the SQL parameter in
+**          the [prepared statement] S having index N, or
+**          NULL if there is no SQL parameter with index N or if the
+**          parameter with index N is an anonymous parameter "?".
 */
 const char *sqlite3_bind_parameter_name(sqlite3_stmt*, int);
 
 /*
-** CAPI3REF: Index Of A Parameter With A Given Name {F13640}
+** CAPI3REF: Index Of A Parameter With A Given Name {H13640} 
+**
+** Return the index of an SQL parameter given its name.  The
+** index value returned is suitable for use as the second
+** parameter to [sqlite3_bind_blob|sqlite3_bind()].  A zero
+** is returned if no matching parameter is found.  The parameter
+** name must be given in UTF-8 even if the original statement
+** was prepared from UTF-16 text using [sqlite3_prepare16_v2()].
 **
-** {F13641} This routine returns the index of a host parameter with the
-** given name.  {F13642} The name must match exactly.  {F13643}
-** If no parameter with the given name is found, return 0.
-** {F13644} Parameter names must be UTF8.
+** See also: [sqlite3_bind_blob|sqlite3_bind()],
+** [sqlite3_bind_parameter_count()], and
+** [sqlite3_bind_parameter_index()].
+**
+** INVARIANTS:
+**
+** {H13641} The [sqlite3_bind_parameter_index(S,N)] interface returns
+**          the index of SQL parameter in the [prepared statement]
+**          S whose name matches the UTF-8 string N, or 0 if there is
+**          no match.
 */
 int sqlite3_bind_parameter_index(sqlite3_stmt*, const char *zName);
 
 /*
-** CAPI3REF: Reset All Bindings On A Prepared Statement {F13660}
+** CAPI3REF: Reset All Bindings On A Prepared Statement {H13660} 
+**
+** Contrary to the intuition of many, [sqlite3_reset()] does not reset
+** the [sqlite3_bind_blob | bindings] on a [prepared statement].
+** Use this routine to reset all host parameters to NULL.
 **
-** {F13661} Contrary to the intuition of many, [sqlite3_reset()] does not
-** reset the [sqlite3_bind_blob | bindings] on a 
-** [sqlite3_stmt | prepared statement]. {F13662} Use this routine to
-** reset all host parameters to NULL.
+** INVARIANTS:
+**
+** {H13661} The [sqlite3_clear_bindings(S)] interface resets all SQL
+**          parameter bindings in the [prepared statement] S back to NULL.
 */
 int sqlite3_clear_bindings(sqlite3_stmt*);
 
 /*
-** CAPI3REF: Number Of Columns In A Result Set {F13710}
+** CAPI3REF: Number Of Columns In A Result Set {H13710} 
+**
+** Return the number of columns in the result set returned by the
+** [prepared statement]. This routine returns 0 if pStmt is an SQL
+** statement that does not return data (for example an [UPDATE]).
 **
-** {F13711} Return the number of columns in the result set returned by the 
-** [sqlite3_stmt | compiled SQL statement]. {F13712} This routine returns 0
-** if pStmt is an SQL statement that does not return data (for 
-** example an UPDATE).
+** INVARIANTS:
+**
+** {H13711} The [sqlite3_column_count(S)] interface returns the number of
+**          columns in the result set generated by the [prepared statement] S,
+**          or 0 if S does not generate a result set.
 */
 int sqlite3_column_count(sqlite3_stmt *pStmt);
 
 /*
-** CAPI3REF: Column Names In A Result Set {F13720}
+** CAPI3REF: Column Names In A Result Set {H13720} 
+**
+** These routines return the name assigned to a particular column
+** in the result set of a [SELECT] statement.  The sqlite3_column_name()
+** interface returns a pointer to a zero-terminated UTF-8 string
+** and sqlite3_column_name16() returns a pointer to a zero-terminated
+** UTF-16 string.  The first parameter is the [prepared statement]
+** that implements the [SELECT] statement. The second parameter is the
+** column number.  The leftmost column is number 0.
+**
+** The returned string pointer is valid until either the [prepared statement]
+** is destroyed by [sqlite3_finalize()] or until the next call to
+** sqlite3_column_name() or sqlite3_column_name16() on the same column.
+**
+** If sqlite3_malloc() fails during the processing of either routine
+** (for example during a conversion from UTF-8 to UTF-16) then a
+** NULL pointer is returned.
+**
+** The name of a result column is the value of the "AS" clause for
+** that column, if there is an AS clause.  If there is no AS clause
+** then the name of the column is unspecified and may change from
+** one release of SQLite to the next.
+**
+** INVARIANTS:
+**
+** {H13721} A successful invocation of the [sqlite3_column_name(S,N)]
+**          interface returns the name of the Nth column (where 0 is
+**          the leftmost column) for the result set of the
+**          [prepared statement] S as a zero-terminated UTF-8 string.
+**
+** {H13723} A successful invocation of the [sqlite3_column_name16(S,N)]
+**          interface returns the name of the Nth column (where 0 is
+**          the leftmost column) for the result set of the
+**          [prepared statement] S as a zero-terminated UTF-16 string
+**          in the native byte order.
+**
+** {H13724} The [sqlite3_column_name()] and [sqlite3_column_name16()]
+**          interfaces return a NULL pointer if they are unable to
+**          allocate memory to hold their normal return strings.
 **
-** {F13721} These routines return the name assigned to a particular column
-** in the result set of a SELECT statement.  {F13722} The sqlite3_column_name()
-** interface returns a pointer to a zero-terminated UTF8 string
-** and sqlite3_column_name16() returns a pointer to a zero-terminated
-** UTF16 string. {F13723}  The first parameter is the
-** [sqlite3_stmt | prepared statement] that implements the SELECT statement.
-** The second parameter is the column number.  The left-most column is
-** number 0.
+** {H13725} If the N parameter to [sqlite3_column_name(S,N)] or
+**          [sqlite3_column_name16(S,N)] is out of range, then the
+**          interfaces return a NULL pointer.
 **
-** {F13724} The returned string pointer is valid until either the 
-** [sqlite3_stmt | prepared statement] is destroyed by [sqlite3_finalize()]
-** or until the next call sqlite3_column_name() or sqlite3_column_name16()
-** on the same column.
+** {H13726} The strings returned by [sqlite3_column_name(S,N)] and
+**          [sqlite3_column_name16(S,N)] are valid until the next
+**          call to either routine with the same S and N parameters
+**          or until [sqlite3_finalize(S)] is called.
 **
-** {F13725} If sqlite3_malloc() fails during the processing of either routine
-** (for example during a conversion from UTF-8 to UTF-16) then a
-** NULL pointer is returned.
+** {H13727} When a result column of a [SELECT] statement contains
+**          an AS clause, the name of that column is the identifier
+**          to the right of the AS keyword.
 */
 const char *sqlite3_column_name(sqlite3_stmt*, int N);
 const void *sqlite3_column_name16(sqlite3_stmt*, int N);
 
 /*
-** CAPI3REF: Source Of Data In A Query Result {F13740}
+** CAPI3REF: Source Of Data In A Query Result {H13740} 
 **
-** {F13741} These routines provide a means to determine what column of what
-** table in which database a result of a SELECT statement comes from.
-** {F13742} The name of the database or table or column can be returned as
-** either a UTF8 or UTF16 string.  {F13743} The _database_ routines return
+** These routines provide a means to determine what column of what
+** table in which database a result of a [SELECT] statement comes from.
+** The name of the database or table or column can be returned as
+** either a UTF-8 or UTF-16 string.  The _database_ routines return
 ** the database name, the _table_ routines return the table name, and
-** the origin_ routines return the column name. {F13744}
-** The returned string is valid until
-** the [sqlite3_stmt | prepared statement] is destroyed using
-** [sqlite3_finalize()] or until the same information is requested
+** the origin_ routines return the column name.
+** The returned string is valid until the [prepared statement] is destroyed
+** using [sqlite3_finalize()] or until the same information is requested
 ** again in a different encoding.
 **
-** {F13745} The names returned are the original un-aliased names of the
+** The names returned are the original un-aliased names of the
 ** database, table, and column.
 **
-** {F13746} The first argument to the following calls is a 
-** [sqlite3_stmt | compiled SQL statement].
-** {F13747} These functions return information about the Nth column returned by 
+** The first argument to the following calls is a [prepared statement].
+** These functions return information about the Nth column returned by
 ** the statement, where N is the second function argument.
 **
-** {F13748} If the Nth column returned by the statement is an expression
-** or subquery and is not a column value, then all of these functions
-** return NULL.  {F13749} Otherwise, they return the 
-** name of the attached database, table and column that query result
-** column was extracted from.
+** If the Nth column returned by the statement is an expression or
+** subquery and is not a column value, then all of these functions return
+** NULL.  These routine might also return NULL if a memory allocation error
+** occurs.  Otherwise, they return the name of the attached database, table
+** and column that query result column was extracted from.
 **
-** {F13750} As with all other SQLite APIs, those postfixed with "16" return
+** As with all other SQLite APIs, those postfixed with "16" return
 ** UTF-16 encoded strings, the other functions return UTF-8. {END}
 **
-** These APIs are only available if the library was compiled with the 
-** SQLITE_ENABLE_COLUMN_METADATA preprocessor symbol defined.
+** These APIs are only available if the library was compiled with the
+** [SQLITE_ENABLE_COLUMN_METADATA] C-preprocessor symbol defined.
 **
-** {U13751}
+** {A13751}
 ** If two or more threads call one or more of these routines against the same
 ** prepared statement and column at the same time then the results are
 ** undefined.
+**
+** INVARIANTS:
+**
+** {H13741} The [sqlite3_column_database_name(S,N)] interface returns either
+**          the UTF-8 zero-terminated name of the database from which the
+**          Nth result column of the [prepared statement] S is extracted,
+**          or NULL if the Nth column of S is a general expression
+**          or if unable to allocate memory to store the name.
+**
+** {H13742} The [sqlite3_column_database_name16(S,N)] interface returns either
+**          the UTF-16 native byte order zero-terminated name of the database
+**          from which the Nth result column of the [prepared statement] S is
+**          extracted, or NULL if the Nth column of S is a general expression
+**          or if unable to allocate memory to store the name.
+**
+** {H13743} The [sqlite3_column_table_name(S,N)] interface returns either
+**          the UTF-8 zero-terminated name of the table from which the
+**          Nth result column of the [prepared statement] S is extracted,
+**          or NULL if the Nth column of S is a general expression
+**          or if unable to allocate memory to store the name.
+**
+** {H13744} The [sqlite3_column_table_name16(S,N)] interface returns either
+**          the UTF-16 native byte order zero-terminated name of the table
+**          from which the Nth result column of the [prepared statement] S is
+**          extracted, or NULL if the Nth column of S is a general expression
+**          or if unable to allocate memory to store the name.
+**
+** {H13745} The [sqlite3_column_origin_name(S,N)] interface returns either
+**          the UTF-8 zero-terminated name of the table column from which the
+**          Nth result column of the [prepared statement] S is extracted,
+**          or NULL if the Nth column of S is a general expression
+**          or if unable to allocate memory to store the name.
+**
+** {H13746} The [sqlite3_column_origin_name16(S,N)] interface returns either
+**          the UTF-16 native byte order zero-terminated name of the table
+**          column from which the Nth result column of the
+**          [prepared statement] S is extracted, or NULL if the Nth column
+**          of S is a general expression or if unable to allocate memory
+**          to store the name.
+**
+** {H13748} The return values from
+**          [sqlite3_column_database_name | column metadata interfaces]
+**          are valid for the lifetime of the [prepared statement]
+**          or until the encoding is changed by another metadata
+**          interface call for the same prepared statement and column.
+**
+** ASSUMPTIONS:
+**
+** {A13751} If two or more threads call one or more
+**          [sqlite3_column_database_name | column metadata interfaces]
+**          for the same [prepared statement] and result column
+**          at the same time then the results are undefined.
 */
 const char *sqlite3_column_database_name(sqlite3_stmt*,int);
 const void *sqlite3_column_database_name16(sqlite3_stmt*,int);
@@ -2002,26 +3313,26 @@ const char *sqlite3_column_origin_name(sqlite3_stmt*,int);
 const void *sqlite3_column_origin_name16(sqlite3_stmt*,int);
 
 /*
-** CAPI3REF: Declared Datatype Of A Query Result {F13760}
+** CAPI3REF: Declared Datatype Of A Query Result {H13760} 
 **
-** The first parameter is a [sqlite3_stmt | compiled SQL statement]. 
-** {F13761} If this statement is a SELECT statement and the Nth column of the 
-** returned result set of that SELECT is a table column (not an
+** The first parameter is a [prepared statement].
+** If this statement is a [SELECT] statement and the Nth column of the
+** returned result set of that [SELECT] is a table column (not an
 ** expression or subquery) then the declared type of the table
-** column is returned.  {F13762} If the Nth column of the result set is an
+** column is returned.  If the Nth column of the result set is an
 ** expression or subquery, then a NULL pointer is returned.
-** {F13763} The returned string is always UTF-8 encoded.  {END} 
-** For example, in the database schema:
+** The returned string is always UTF-8 encoded. {END}
+**
+** For example, given the database schema:
 **
 ** CREATE TABLE t1(c1 VARIANT);
 **
-** And the following statement compiled:
+** and the following statement to be compiled:
 **
 ** SELECT c1 + 1, c1 FROM t1;
 **
-** Then this routine would return the string "VARIANT" for the second
-** result column (i==1), and a NULL pointer for the first result column
-** (i==0).
+** this routine would return the string "VARIANT" for the second result
+** column (i==1), and a NULL pointer for the first result column (i==0).
 **
 ** SQLite uses dynamic run-time typing.  So just because a column
 ** is declared to contain a particular type does not mean that the
@@ -2029,36 +3340,55 @@ const void *sqlite3_column_origin_name16(sqlite3_stmt*,int);
 ** strongly typed, but the typing is dynamic not static.  Type
 ** is associated with individual values, not with the containers
 ** used to hold those values.
+**
+** INVARIANTS:
+**
+** {H13761}  A successful call to [sqlite3_column_decltype(S,N)] returns a
+**           zero-terminated UTF-8 string containing the declared datatype
+**           of the table column that appears as the Nth column (numbered
+**           from 0) of the result set to the [prepared statement] S.
+**
+** {H13762}  A successful call to [sqlite3_column_decltype16(S,N)]
+**           returns a zero-terminated UTF-16 native byte order string
+**           containing the declared datatype of the table column that appears
+**           as the Nth column (numbered from 0) of the result set to the
+**           [prepared statement] S.
+**
+** {H13763}  If N is less than 0 or N is greater than or equal to
+**           the number of columns in the [prepared statement] S,
+**           or if the Nth column of S is an expression or subquery rather
+**           than a table column, or if a memory allocation failure
+**           occurs during encoding conversions, then
+**           calls to [sqlite3_column_decltype(S,N)] or
+**           [sqlite3_column_decltype16(S,N)] return NULL.
 */
-const char *sqlite3_column_decltype(sqlite3_stmt *, int i);
+const char *sqlite3_column_decltype(sqlite3_stmt*,int);
 const void *sqlite3_column_decltype16(sqlite3_stmt*,int);
 
-/* 
-** CAPI3REF:  Evaluate An SQL Statement {F13200}
+/*
+** CAPI3REF: Evaluate An SQL Statement {H13200} 
 **
-** After an [sqlite3_stmt | SQL statement] has been prepared with a call
-** to either [sqlite3_prepare_v2()] or [sqlite3_prepare16_v2()] or to one of
-** the legacy interfaces [sqlite3_prepare()] or [sqlite3_prepare16()],
-** then this function must be called one or more times to evaluate the 
-** statement.
+** After a [prepared statement] has been prepared using either
+** [sqlite3_prepare_v2()] or [sqlite3_prepare16_v2()] or one of the legacy
+** interfaces [sqlite3_prepare()] or [sqlite3_prepare16()], this function
+** must be called one or more times to evaluate the statement.
 **
-** The details of the behavior of this sqlite3_step() interface depend
+** The details of the behavior of the sqlite3_step() interface depend
 ** on whether the statement was prepared using the newer "v2" interface
 ** [sqlite3_prepare_v2()] and [sqlite3_prepare16_v2()] or the older legacy
 ** interface [sqlite3_prepare()] and [sqlite3_prepare16()].  The use of the
 ** new "v2" interface is recommended for new applications but the legacy
 ** interface will continue to be supported.
 **
-** In the lagacy interface, the return value will be either [SQLITE_BUSY], 
+** In the legacy interface, the return value will be either [SQLITE_BUSY],
 ** [SQLITE_DONE], [SQLITE_ROW], [SQLITE_ERROR], or [SQLITE_MISUSE].
-** With the "v2" interface, any of the other [SQLITE_OK | result code]
-** or [SQLITE_IOERR_READ | extended result code] might be returned as
-** well.
+** With the "v2" interface, any of the other [result codes] or
+** [extended result codes] might be returned as well.
 **
 ** [SQLITE_BUSY] means that the database engine was unable to acquire the
-** database locks it needs to do its job.  If the statement is a COMMIT
+** database locks it needs to do its job.  If the statement is a [COMMIT]
 ** or occurs outside of an explicit transaction, then you can retry the
-** statement.  If the statement is not a COMMIT and occurs within a
+** statement.  If the statement is not a [COMMIT] and occurs within a
 ** explicit transaction then you should rollback the transaction before
 ** continuing.
 **
@@ -2067,64 +3397,91 @@ const void *sqlite3_column_decltype16(sqlite3_stmt*,int);
 ** machine without first calling [sqlite3_reset()] to reset the virtual
 ** machine back to its initial state.
 **
-** If the SQL statement being executed returns any data, then 
-** [SQLITE_ROW] is returned each time a new row of data is ready
-** for processing by the caller. The values may be accessed using
-** the [sqlite3_column_int | column access functions].
+** If the SQL statement being executed returns any data, then [SQLITE_ROW]
+** is returned each time a new row of data is ready for processing by the
+** caller. The values may be accessed using the [column access functions].
 ** sqlite3_step() is called again to retrieve the next row of data.
-** 
+**
 ** [SQLITE_ERROR] means that a run-time error (such as a constraint
 ** violation) has occurred.  sqlite3_step() should not be called again on
 ** the VM. More information may be found by calling [sqlite3_errmsg()].
-** With the legacy interface, a more specific error code (example:
+** With the legacy interface, a more specific error code (for example,
 ** [SQLITE_INTERRUPT], [SQLITE_SCHEMA], [SQLITE_CORRUPT], and so forth)
 ** can be obtained by calling [sqlite3_reset()] on the
-** [sqlite3_stmt | prepared statement].  In the "v2" interface,
+** [prepared statement].  In the "v2" interface,
 ** the more specific error code is returned directly by sqlite3_step().
 **
 ** [SQLITE_MISUSE] means that the this routine was called inappropriately.
-** Perhaps it was called on a [sqlite3_stmt | prepared statement] that has
-** already been [sqlite3_finalize | finalized] or on one that had 
+** Perhaps it was called on a [prepared statement] that has
+** already been [sqlite3_finalize | finalized] or on one that had
 ** previously returned [SQLITE_ERROR] or [SQLITE_DONE].  Or it could
 ** be the case that the same database connection is being used by two or
 ** more threads at the same moment in time.
 **
-** Goofy Interface Alert:
-** In the legacy interface, 
-** the sqlite3_step() API always returns a generic error code,
-** [SQLITE_ERROR], following any error other than [SQLITE_BUSY]
-** and [SQLITE_MISUSE].  You must call [sqlite3_reset()] or
-** [sqlite3_finalize()] in order to find one of the specific
-** [SQLITE_ERROR | result codes] that better describes the error.
+** Goofy Interface Alert: In the legacy interface, the sqlite3_step()
+** API always returns a generic error code, [SQLITE_ERROR], following any
+** error other than [SQLITE_BUSY] and [SQLITE_MISUSE].  You must call
+** [sqlite3_reset()] or [sqlite3_finalize()] in order to find one of the
+** specific [error codes] that better describes the error.
 ** We admit that this is a goofy design.  The problem has been fixed
 ** with the "v2" interface.  If you prepare all of your SQL statements
 ** using either [sqlite3_prepare_v2()] or [sqlite3_prepare16_v2()] instead
-** of the legacy [sqlite3_prepare()] and [sqlite3_prepare16()], then the 
-** more specific [SQLITE_ERROR | result codes] are returned directly
+** of the legacy [sqlite3_prepare()] and [sqlite3_prepare16()] interfaces,
+** then the more specific [error codes] are returned directly
 ** by sqlite3_step().  The use of the "v2" interface is recommended.
+**
+** INVARIANTS:
+**
+** {H13202}  If the [prepared statement] S is ready to be run, then
+**           [sqlite3_step(S)] advances that prepared statement until
+**           completion or until it is ready to return another row of the
+**           result set, or until an [sqlite3_interrupt | interrupt]
+**           or a run-time error occurs.
+**
+** {H15304}  When a call to [sqlite3_step(S)] causes the [prepared statement]
+**           S to run to completion, the function returns [SQLITE_DONE].
+**
+** {H15306}  When a call to [sqlite3_step(S)] stops because it is ready to
+**           return another row of the result set, it returns [SQLITE_ROW].
+**
+** {H15308}  If a call to [sqlite3_step(S)] encounters an
+**           [sqlite3_interrupt | interrupt] or a run-time error,
+**           it returns an appropriate error code that is not one of
+**           [SQLITE_OK], [SQLITE_ROW], or [SQLITE_DONE].
+**
+** {H15310}  If an [sqlite3_interrupt | interrupt] or a run-time error
+**           occurs during a call to [sqlite3_step(S)]
+**           for a [prepared statement] S created using
+**           legacy interfaces [sqlite3_prepare()] or
+**           [sqlite3_prepare16()], then the function returns either
+**           [SQLITE_ERROR], [SQLITE_BUSY], or [SQLITE_MISUSE].
 */
 int sqlite3_step(sqlite3_stmt*);
 
 /*
-** CAPI3REF: Number of columns in a result set {F13770}
+** CAPI3REF: Number of columns in a result set {H13770} 
+**
+** Returns the number of values in the current row of the result set.
+**
+** INVARIANTS:
 **
-** Return the number of values in the current row of the result set.
+** {H13771}  After a call to [sqlite3_step(S)] that returns [SQLITE_ROW],
+**           the [sqlite3_data_count(S)] routine will return the same value
+**           as the [sqlite3_column_count(S)] function.
 **
-** {F13771} After a call to [sqlite3_step()] that returns [SQLITE_ROW],
-** this routine
-** will return the same value as the [sqlite3_column_count()] function.
-** {F13772}
-** After [sqlite3_step()] has returned an [SQLITE_DONE], [SQLITE_BUSY], or
-** a [SQLITE_ERROR | error code], or before [sqlite3_step()] has been 
-** called on the [sqlite3_stmt | prepared statement] for the first time,
-** this routine returns zero.
+** {H13772}  After [sqlite3_step(S)] has returned any value other than
+**           [SQLITE_ROW] or before [sqlite3_step(S)] has been called on the
+**           [prepared statement] for the first time since it was
+**           [sqlite3_prepare | prepared] or [sqlite3_reset | reset],
+**           the [sqlite3_data_count(S)] routine returns zero.
 */
 int sqlite3_data_count(sqlite3_stmt *pStmt);
 
 /*
-** CAPI3REF: Fundamental Datatypes {F10265}
+** CAPI3REF: Fundamental Datatypes {H10265} 
+** KEYWORDS: SQLITE_TEXT
 **
-** {F10266}Every value in SQLite has one of five fundamental datatypes:
+** {H10266} Every value in SQLite has one of five fundamental datatypes:
 **
 ** 
      
 ** 
    •  64-bit signed integer
@@ -2138,7 +3495,7 @@ int sqlite3_data_count(sqlite3_stmt *pStmt);
 **
 ** Note that the SQLITE_TEXT constant was also used in SQLite version 2
 ** for a completely different meaning.  Software that links against both
-** SQLite version 2 and SQLite version 3 should use SQLITE3_TEXT not
+** SQLite version 2 and SQLite version 3 should use SQLITE3_TEXT, not
 ** SQLITE_TEXT.
 */
 #define SQLITE_INTEGER  1
@@ -2153,31 +3510,31 @@ int sqlite3_data_count(sqlite3_stmt *pStmt);
 #define SQLITE3_TEXT     3
 
 /*
-** CAPI3REF: Results Values From A Query {F13800}
+** CAPI3REF: Result Values From A Query {H13800} 
+** KEYWORDS: {column access functions}
 **
-** These routines return information about
-** a single column of the current result row of a query.  In every
-** case the first argument is a pointer to the 
-** [sqlite3_stmt | SQL statement] that is being
-** evaluated (the [sqlite3_stmt*] that was returned from 
-** [sqlite3_prepare_v2()] or one of its variants) and
-** the second argument is the index of the column for which information 
-** should be returned.  The left-most column of the result set
-** has an index of 0.
+** These routines form the "result set query" interface.
 **
-** If the SQL statement is not currently point to a valid row, or if the
-** the column index is out of range, the result is undefined. 
+** These routines return information about a single column of the current
+** result row of a query.  In every case the first argument is a pointer
+** to the [prepared statement] that is being evaluated (the [sqlite3_stmt*]
+** that was returned from [sqlite3_prepare_v2()] or one of its variants)
+** and the second argument is the index of the column for which information
+** should be returned.  The leftmost column of the result set has the index 0.
+**
+** If the SQL statement does not currently point to a valid row, or if the
+** column index is out of range, the result is undefined.
 ** These routines may only be called when the most recent call to
 ** [sqlite3_step()] has returned [SQLITE_ROW] and neither
-** [sqlite3_reset()] nor [sqlite3_finalize()] has been call subsequently.
+** [sqlite3_reset()] nor [sqlite3_finalize()] have been called subsequently.
 ** If any of these routines are called after [sqlite3_reset()] or
 ** [sqlite3_finalize()] or after [sqlite3_step()] has returned
 ** something other than [SQLITE_ROW], the results are undefined.
 ** If [sqlite3_step()] or [sqlite3_reset()] or [sqlite3_finalize()]
 ** are called from a different thread while any of these routines
-** are pending, then the results are undefined.  
+** are pending, then the results are undefined.
 **
-** The sqlite3_column_type() routine returns 
+** The sqlite3_column_type() routine returns the
 ** [SQLITE_INTEGER | datatype code] for the initial data type
 ** of the result column.  The returned value is one of [SQLITE_INTEGER],
 ** [SQLITE_FLOAT], [SQLITE_TEXT], [SQLITE_BLOB], or [SQLITE_NULL].  The value
@@ -2187,7 +3544,7 @@ int sqlite3_data_count(sqlite3_stmt *pStmt);
 ** versions of SQLite may change the behavior of sqlite3_column_type()
 ** following a type conversion.
 **
-** If the result is a BLOB or UTF-8 string then the sqlite3_column_bytes() 
+** If the result is a BLOB or UTF-8 string then the sqlite3_column_bytes()
 ** routine returns the number of bytes in that BLOB or string.
 ** If the result is a UTF-16 string, then sqlite3_column_bytes() converts
 ** the string to UTF-8 and then returns the number of bytes.
@@ -2199,19 +3556,27 @@ int sqlite3_data_count(sqlite3_stmt *pStmt);
 ** bytes in the string, not the number of characters.
 **
 ** Strings returned by sqlite3_column_text() and sqlite3_column_text16(),
-** even zero-length strings, are always zero terminated.  The return
-** value from sqlite3_column_blob() for a zero-length blob is an arbitrary
+** even empty strings, are always zero terminated.  The return
+** value from sqlite3_column_blob() for a zero-length BLOB is an arbitrary
 ** pointer, possibly even a NULL pointer.
 **
 ** The sqlite3_column_bytes16() routine is similar to sqlite3_column_bytes()
-** but leaves the result in UTF-16 instead of UTF-8.  
+** but leaves the result in UTF-16 in native byte order instead of UTF-8.
 ** The zero terminator is not included in this count.
 **
+** The object returned by [sqlite3_column_value()] is an
+** [unprotected sqlite3_value] object.  An unprotected sqlite3_value object
+** may only be used with [sqlite3_bind_value()] and [sqlite3_result_value()].
+** If the [unprotected sqlite3_value] object returned by
+** [sqlite3_column_value()] is used in any other way, including calls
+** to routines like [sqlite3_value_int()], [sqlite3_value_text()],
+** or [sqlite3_value_bytes()], then the behavior is undefined.
+**
 ** These routines attempt to convert the value where appropriate.  For
 ** example, if the internal representation is FLOAT and a text result
-** is requested, [sqlite3_snprintf()] is used internally to do the conversion
-** automatically.  The following table details the conversions that
-** are applied:
+** is requested, [sqlite3_snprintf()] is used internally to perform the
+** conversion automatically.  The following table details the conversions
+** that are applied:
 **
 ** 
      
 ** 
@@ -2223,7 +3588,7 @@ int sqlite3_data_count(sqlite3_stmt *pStmt);
 ** 
        NULL       BLOB     Result is NULL pointer
 ** 
       INTEGER    FLOAT     Convert from integer to float
 ** 
       INTEGER     TEXT     ASCII rendering of the integer
-** 
       INTEGER     BLOB     Same as for INTEGER->TEXT
+** 
       INTEGER     BLOB     Same as INTEGER->TEXT
 ** 
        FLOAT    INTEGER    Convert from float to integer
 ** 
        FLOAT      TEXT     ASCII rendering of the float
 ** 
        FLOAT      BLOB     Same as FLOAT->TEXT
@@ -2238,57 +3603,56 @@ int sqlite3_data_count(sqlite3_stmt *pStmt);
 **
 ** The table above makes reference to standard C library functions atoi()
 ** and atof().  SQLite does not really use these functions.  It has its
-** on equavalent internal routines.  The atoi() and atof() names are
+** own equivalent internal routines.  The atoi() and atof() names are
 ** used in the table for brevity and because they are familiar to most
 ** C programmers.
 **
 ** Note that when type conversions occur, pointers returned by prior
 ** calls to sqlite3_column_blob(), sqlite3_column_text(), and/or
-** sqlite3_column_text16() may be invalidated. 
+** sqlite3_column_text16() may be invalidated.
 ** Type conversions and pointer invalidations might occur
 ** in the following cases:
 **
 ** 
        
-** 
      •   The initial content is a BLOB and sqlite3_column_text() 
-**          or sqlite3_column_text16() is called.  A zero-terminator might
-**          need to be added to the string.
        • 
-**
-** 
      •   The initial content is UTF-8 text and sqlite3_column_bytes16() or
-**          sqlite3_column_text16() is called.  The content must be converted
-**          to UTF-16.
        • 
-**
-** 
      •   The initial content is UTF-16 text and sqlite3_column_bytes() or
-**          sqlite3_column_text() is called.  The content must be converted
-**          to UTF-8.
        • 
+** 
      •  The initial content is a BLOB and sqlite3_column_text() or
+**      sqlite3_column_text16() is called.  A zero-terminator might
+**      need to be added to the string.
        • 
+** 
      •  The initial content is UTF-8 text and sqlite3_column_bytes16() or
+**      sqlite3_column_text16() is called.  The content must be converted
+**      to UTF-16.
        • 
+** 
      •  The initial content is UTF-16 text and sqlite3_column_bytes() or
+**      sqlite3_column_text() is called.  The content must be converted
+**      to UTF-8.
        • 
 ** 
      
 **
 ** Conversions between UTF-16be and UTF-16le are always done in place and do
 ** not invalidate a prior pointer, though of course the content of the buffer
 ** that the prior pointer points to will have been modified.  Other kinds
-** of conversion are done in place when it is possible, but sometime it is
-** not possible and in those cases prior pointers are invalidated.  
+** of conversion are done in place when it is possible, but sometimes they
+** are not possible and in those cases prior pointers are invalidated.
 **
 ** The safest and easiest to remember policy is to invoke these routines
 ** in one of the following ways:
 **
-**  
        
+** 
          
 **  
        • sqlite3_column_text() followed by sqlite3_column_bytes()
          • 
 **  
        • sqlite3_column_blob() followed by sqlite3_column_bytes()
          • 
 **  
        • sqlite3_column_text16() followed by sqlite3_column_bytes16()
          • 
-**  
        
+** 
      
 **
-** In other words, you should call sqlite3_column_text(), sqlite3_column_blob(),
-** or sqlite3_column_text16() first to force the result into the desired
-** format, then invoke sqlite3_column_bytes() or sqlite3_column_bytes16() to
-** find the size of the result.  Do not mix call to sqlite3_column_text() or
-** sqlite3_column_blob() with calls to sqlite3_column_bytes16().  And do not
-** mix calls to sqlite3_column_text16() with calls to sqlite3_column_bytes().
+** In other words, you should call sqlite3_column_text(),
+** sqlite3_column_blob(), or sqlite3_column_text16() first to force the result
+** into the desired format, then invoke sqlite3_column_bytes() or
+** sqlite3_column_bytes16() to find the size of the result.  Do not mix calls
+** to sqlite3_column_text() or sqlite3_column_blob() with calls to
+** sqlite3_column_bytes16(), and do not mix calls to sqlite3_column_text16()
+** with calls to sqlite3_column_bytes().
 **
 ** The pointers returned are valid until a type conversion occurs as
 ** described above, or until [sqlite3_step()] or [sqlite3_reset()] or
 ** [sqlite3_finalize()] is called.  The memory space used to hold strings
-** and blobs is freed automatically.  Do not pass the pointers returned
-** [sqlite3_column_blob()], [sqlite3_column_text()], etc. into 
+** and BLOBs is freed automatically.  Do not pass the pointers returned
+** [sqlite3_column_blob()], [sqlite3_column_text()], etc. into
 ** [sqlite3_free()].
 **
 ** If a memory allocation error occurs during the evaluation of any
@@ -2296,6 +3660,61 @@ int sqlite3_data_count(sqlite3_stmt *pStmt);
 ** is either the integer 0, the floating point number 0.0, or a NULL
 ** pointer.  Subsequent calls to [sqlite3_errcode()] will return
 ** [SQLITE_NOMEM].
+**
+** INVARIANTS:
+**
+** {H13803} The [sqlite3_column_blob(S,N)] interface converts the
+**          Nth column in the current row of the result set for
+**          the [prepared statement] S into a BLOB and then returns a
+**          pointer to the converted value.
+**
+** {H13806} The [sqlite3_column_bytes(S,N)] interface returns the
+**          number of bytes in the BLOB or string (exclusive of the
+**          zero terminator on the string) that was returned by the
+**          most recent call to [sqlite3_column_blob(S,N)] or
+**          [sqlite3_column_text(S,N)].
+**
+** {H13809} The [sqlite3_column_bytes16(S,N)] interface returns the
+**          number of bytes in the string (exclusive of the
+**          zero terminator on the string) that was returned by the
+**          most recent call to [sqlite3_column_text16(S,N)].
+**
+** {H13812} The [sqlite3_column_double(S,N)] interface converts the
+**          Nth column in the current row of the result set for the
+**          [prepared statement] S into a floating point value and
+**          returns a copy of that value.
+**
+** {H13815} The [sqlite3_column_int(S,N)] interface converts the
+**          Nth column in the current row of the result set for the
+**          [prepared statement] S into a 64-bit signed integer and
+**          returns the lower 32 bits of that integer.
+**
+** {H13818} The [sqlite3_column_int64(S,N)] interface converts the
+**          Nth column in the current row of the result set for the
+**          [prepared statement] S into a 64-bit signed integer and
+**          returns a copy of that integer.
+**
+** {H13821} The [sqlite3_column_text(S,N)] interface converts the
+**          Nth column in the current row of the result set for
+**          the [prepared statement] S into a zero-terminated UTF-8
+**          string and returns a pointer to that string.
+**
+** {H13824} The [sqlite3_column_text16(S,N)] interface converts the
+**          Nth column in the current row of the result set for the
+**          [prepared statement] S into a zero-terminated 2-byte
+**          aligned UTF-16 native byte order string and returns
+**          a pointer to that string.
+**
+** {H13827} The [sqlite3_column_type(S,N)] interface returns
+**          one of [SQLITE_NULL], [SQLITE_INTEGER], [SQLITE_FLOAT],
+**          [SQLITE_TEXT], or [SQLITE_BLOB] as appropriate for
+**          the Nth column in the current row of the result set for
+**          the [prepared statement] S.
+**
+** {H13830} The [sqlite3_column_value(S,N)] interface returns a
+**          pointer to an [unprotected sqlite3_value] object for the
+**          Nth column in the current row of the result set for
+**          the [prepared statement] S.
 */
 const void *sqlite3_column_blob(sqlite3_stmt*, int iCol);
 int sqlite3_column_bytes(sqlite3_stmt*, int iCol);
@@ -2309,64 +3728,88 @@ int sqlite3_column_type(sqlite3_stmt*, int iCol);
 sqlite3_value *sqlite3_column_value(sqlite3_stmt*, int iCol);
 
 /*
-** CAPI3REF: Destroy A Prepared Statement Object {F13300}
+** CAPI3REF: Destroy A Prepared Statement Object {H13300} 
 **
-** The sqlite3_finalize() function is called to delete a 
-** [sqlite3_stmt | compiled SQL statement]. If the statement was
-** executed successfully, or not executed at all, then SQLITE_OK is returned.
-** If execution of the statement failed then an 
-** [SQLITE_ERROR | error code] or [SQLITE_IOERR_READ | extended error code]
-** is returned. 
+** The sqlite3_finalize() function is called to delete a [prepared statement].
+** If the statement was executed successfully or not executed at all, then
+** SQLITE_OK is returned. If execution of the statement failed then an
+** [error code] or [extended error code] is returned.
 **
 ** This routine can be called at any point during the execution of the
-** [sqlite3_stmt | virtual machine].  If the virtual machine has not 
+** [prepared statement].  If the virtual machine has not
 ** completed execution when this routine is called, that is like
-** encountering an error or an interrupt.  (See [sqlite3_interrupt()].) 
-** Incomplete updates may be rolled back and transactions cancelled,  
-** depending on the circumstances, and the 
-** [SQLITE_ERROR | result code] returned will be [SQLITE_ABORT].
+** encountering an error or an [sqlite3_interrupt | interrupt].
+** Incomplete updates may be rolled back and transactions canceled,
+** depending on the circumstances, and the
+** [error code] returned will be [SQLITE_ABORT].
+**
+** INVARIANTS:
+**
+** {H11302} The [sqlite3_finalize(S)] interface destroys the
+**          [prepared statement] S and releases all
+**          memory and file resources held by that object.
+**
+** {H11304} If the most recent call to [sqlite3_step(S)] for the
+**          [prepared statement] S returned an error,
+**          then [sqlite3_finalize(S)] returns that same error.
 */
 int sqlite3_finalize(sqlite3_stmt *pStmt);
 
 /*
-** CAPI3REF: Reset A Prepared Statement Object {F13330}
+** CAPI3REF: Reset A Prepared Statement Object {H13330} 
 **
-** The sqlite3_reset() function is called to reset a 
-** [sqlite3_stmt | compiled SQL statement] object.
-** back to its initial state, ready to be re-executed.
+** The sqlite3_reset() function is called to reset a [prepared statement]
+** object back to its initial state, ready to be re-executed.
 ** Any SQL statement variables that had values bound to them using
 ** the [sqlite3_bind_blob | sqlite3_bind_*() API] retain their values.
 ** Use [sqlite3_clear_bindings()] to reset the bindings.
+**
+** {H11332} The [sqlite3_reset(S)] interface resets the [prepared statement] S
+**          back to the beginning of its program.
+**
+** {H11334} If the most recent call to [sqlite3_step(S)] for the
+**          [prepared statement] S returned [SQLITE_ROW] or [SQLITE_DONE],
+**          or if [sqlite3_step(S)] has never before been called on S,
+**          then [sqlite3_reset(S)] returns [SQLITE_OK].
+**
+** {H11336} If the most recent call to [sqlite3_step(S)] for the
+**          [prepared statement] S indicated an error, then
+**          [sqlite3_reset(S)] returns an appropriate [error code].
+**
+** {H11338} The [sqlite3_reset(S)] interface does not change the values
+**          of any [sqlite3_bind_blob|bindings] on the [prepared statement] S.
 */
 int sqlite3_reset(sqlite3_stmt *pStmt);
 
 /*
-** CAPI3REF: Create Or Redefine SQL Functions {F16100}
-**
-** The following two functions are used to add SQL functions or aggregates
-** or to redefine the behavior of existing SQL functions or aggregates.  The
-** difference only between the two is that the second parameter, the
-** name of the (scalar) function or aggregate, is encoded in UTF-8 for
-** sqlite3_create_function() and UTF-16 for sqlite3_create_function16().
-**
-** The first argument is the [sqlite3 | database handle] that holds the
-** SQL function or aggregate is to be added or redefined. If a single
-** program uses more than one database handle internally, then SQL
-** functions or aggregates must be added individually to each database
-** handle with which they will be used.
-**
-** The second parameter is the name of the SQL function to be created
-** or redefined.
-** The length of the name is limited to 255 bytes, exclusive of the 
-** zero-terminator.  Note that the name length limit is in bytes, not
+** CAPI3REF: Create Or Redefine SQL Functions {H16100} 
+** KEYWORDS: {function creation routines}
+** KEYWORDS: {application-defined SQL function}
+** KEYWORDS: {application-defined SQL functions}
+**
+** These two functions (collectively known as "function creation routines")
+** are used to add SQL functions or aggregates or to redefine the behavior
+** of existing SQL functions or aggregates.  The only difference between the
+** two is that the second parameter, the name of the (scalar) function or
+** aggregate, is encoded in UTF-8 for sqlite3_create_function() and UTF-16
+** for sqlite3_create_function16().
+**
+** The first parameter is the [database connection] to which the SQL
+** function is to be added.  If a single program uses more than one database
+** connection internally, then SQL functions must be added individually to
+** each database connection.
+**
+** The second parameter is the name of the SQL function to be created or
+** redefined.  The length of the name is limited to 255 bytes, exclusive of
+** the zero-terminator.  Note that the name length limit is in bytes, not
 ** characters.  Any attempt to create a function with a longer name
-** will result in an SQLITE_ERROR error.
+** will result in [SQLITE_ERROR] being returned.
 **
 ** The third parameter is the number of arguments that the SQL function or
 ** aggregate takes. If this parameter is negative, then the SQL function or
 ** aggregate may take any number of arguments.
 **
-** The fourth parameter, eTextRep, specifies what 
+** The fourth parameter, eTextRep, specifies what
 ** [SQLITE_UTF8 | text encoding] this SQL function prefers for
 ** its parameters.  Any SQL function implementation should be able to work
 ** work with UTF-8, UTF-16le, or UTF-16be.  But some implementations may be
@@ -2375,52 +3818,114 @@ int sqlite3_reset(sqlite3_stmt *pStmt);
 ** times with the same function but with different values of eTextRep.
 ** When multiple implementations of the same function are available, SQLite
 ** will pick the one that involves the least amount of data conversion.
-** If there is only a single implementation which does not care what
-** text encoding is used, then the fourth argument should be
-** [SQLITE_ANY].
+** If there is only a single implementation which does not care what text
+** encoding is used, then the fourth argument should be [SQLITE_ANY].
 **
-** The fifth parameter is an arbitrary pointer.  The implementation
-** of the function can gain access to this pointer using
-** [sqlite3_user_data()].
+** The fifth parameter is an arbitrary pointer.  The implementation of the
+** function can gain access to this pointer using [sqlite3_user_data()].
 **
 ** The seventh, eighth and ninth parameters, xFunc, xStep and xFinal, are
-** pointers to C-language functions that implement the SQL
-** function or aggregate. A scalar SQL function requires an implementation of
-** the xFunc callback only, NULL pointers should be passed as the xStep
-** and xFinal parameters. An aggregate SQL function requires an implementation
-** of xStep and xFinal and NULL should be passed for xFunc. To delete an
-** existing SQL function or aggregate, pass NULL for all three function
-** callback.
+** pointers to C-language functions that implement the SQL function or
+** aggregate. A scalar SQL function requires an implementation of the xFunc
+** callback only, NULL pointers should be passed as the xStep and xFinal
+** parameters. An aggregate SQL function requires an implementation of xStep
+** and xFinal and NULL should be passed for xFunc. To delete an existing
+** SQL function or aggregate, pass NULL for all three function callbacks.
 **
 ** It is permitted to register multiple implementations of the same
 ** functions with the same name but with either differing numbers of
-** arguments or differing perferred text encodings.  SQLite will use
+** arguments or differing preferred text encodings.  SQLite will use
 ** the implementation most closely matches the way in which the
 ** SQL function is used.
+**
+** INVARIANTS:
+**
+** {H16103} The [sqlite3_create_function16()] interface behaves exactly
+**          like [sqlite3_create_function()] in every way except that it
+**          interprets the zFunctionName argument as zero-terminated UTF-16
+**          native byte order instead of as zero-terminated UTF-8.
+**
+** {H16106} A successful invocation of
+**          the [sqlite3_create_function(D,X,N,E,...)] interface registers
+**          or replaces callback functions in the [database connection] D
+**          used to implement the SQL function named X with N parameters
+**          and having a preferred text encoding of E.
+**
+** {H16109} A successful call to [sqlite3_create_function(D,X,N,E,P,F,S,L)]
+**          replaces the P, F, S, and L values from any prior calls with
+**          the same D, X, N, and E values.
+**
+** {H16112} The [sqlite3_create_function(D,X,...)] interface fails with
+**          a return code of [SQLITE_ERROR] if the SQL function name X is
+**          longer than 255 bytes exclusive of the zero terminator.
+**
+** {H16118} Either F must be NULL and S and L are non-NULL or else F
+**          is non-NULL and S and L are NULL, otherwise
+**          [sqlite3_create_function(D,X,N,E,P,F,S,L)] returns [SQLITE_ERROR].
+**
+** {H16121} The [sqlite3_create_function(D,...)] interface fails with an
+**          error code of [SQLITE_BUSY] if there exist [prepared statements]
+**          associated with the [database connection] D.
+**
+** {H16124} The [sqlite3_create_function(D,X,N,...)] interface fails with an
+**          error code of [SQLITE_ERROR] if parameter N (specifying the number
+**          of arguments to the SQL function being registered) is less
+**          than -1 or greater than 127.
+**
+** {H16127} When N is non-negative, the [sqlite3_create_function(D,X,N,...)]
+**          interface causes callbacks to be invoked for the SQL function
+**          named X when the number of arguments to the SQL function is
+**          exactly N.
+**
+** {H16130} When N is -1, the [sqlite3_create_function(D,X,N,...)]
+**          interface causes callbacks to be invoked for the SQL function
+**          named X with any number of arguments.
+**
+** {H16133} When calls to [sqlite3_create_function(D,X,N,...)]
+**          specify multiple implementations of the same function X
+**          and when one implementation has N>=0 and the other has N=(-1)
+**          the implementation with a non-zero N is preferred.
+**
+** {H16136} When calls to [sqlite3_create_function(D,X,N,E,...)]
+**          specify multiple implementations of the same function X with
+**          the same number of arguments N but with different
+**          encodings E, then the implementation where E matches the
+**          database encoding is preferred.
+**
+** {H16139} For an aggregate SQL function created using
+**          [sqlite3_create_function(D,X,N,E,P,0,S,L)] the finalizer
+**          function L will always be invoked exactly once if the
+**          step function S is called one or more times.
+**
+** {H16142} When SQLite invokes either the xFunc or xStep function of
+**          an application-defined SQL function or aggregate created
+**          by [sqlite3_create_function()] or [sqlite3_create_function16()],
+**          then the array of [sqlite3_value] objects passed as the
+**          third parameter are always [protected sqlite3_value] objects.
 */
 int sqlite3_create_function(
-  sqlite3 *,
+  sqlite3 *db,
   const char *zFunctionName,
   int nArg,
   int eTextRep,
-  void*,
+  void *pApp,
   void (*xFunc)(sqlite3_context*,int,sqlite3_value**),
   void (*xStep)(sqlite3_context*,int,sqlite3_value**),
   void (*xFinal)(sqlite3_context*)
 );
 int sqlite3_create_function16(
-  sqlite3*,
+  sqlite3 *db,
   const void *zFunctionName,
   int nArg,
   int eTextRep,
-  void*,
+  void *pApp,
   void (*xFunc)(sqlite3_context*,int,sqlite3_value**),
   void (*xStep)(sqlite3_context*,int,sqlite3_value**),
   void (*xFinal)(sqlite3_context*)
 );
 
 /*
-** CAPI3REF: Text Encodings {F10267}
+** CAPI3REF: Text Encodings {H10267}  
 **
 ** These constant define integer codes that represent the various
 ** text encodings supported by SQLite.
@@ -2433,11 +3938,12 @@ int sqlite3_create_function16(
 #define SQLITE_UTF16_ALIGNED  8    /* sqlite3_create_collation only */
 
 /*
-** CAPI3REF: Obsolete Functions
+** CAPI3REF: Deprecated Functions
+** DEPRECATED
 **
-** These functions are all now obsolete.  In order to maintain
-** backwards compatibility with older code, we continue to support
-** these functions.  However, new development projects should avoid
+** These functions are [deprecated].  In order to maintain
+** backwards compatibility with older code, these functions continue 
+** to be supported.  However, new applications should avoid
 ** the use of these functions.  To help encourage people to avoid
 ** using these functions, we are not going to tell you want they do.
 */
@@ -2449,7 +3955,7 @@ void sqlite3_thread_cleanup(void);
 int sqlite3_memory_alarm(void(*)(void*,sqlite3_int64,int),void*,sqlite3_int64);
 
 /*
-** CAPI3REF: Obtaining SQL Function Parameter Values {F15100}
+** CAPI3REF: Obtaining SQL Function Parameter Values {H15100} 
 **
 ** The C-language implementation of SQL functions and aggregates uses
 ** this set of interface routines to access the parameter values on
@@ -2459,40 +3965,101 @@ int sqlite3_memory_alarm(void(*)(void*,sqlite3_int64,int),void*,sqlite3_int64);
 ** to [sqlite3_create_function()] and [sqlite3_create_function16()]
 ** define callbacks that implement the SQL functions and aggregates.
 ** The 4th parameter to these callbacks is an array of pointers to
-** [sqlite3_value] objects.  There is one [sqlite3_value] object for
+** [protected sqlite3_value] objects.  There is one [sqlite3_value] object for
 ** each parameter to the SQL function.  These routines are used to
 ** extract values from the [sqlite3_value] objects.
 **
-** These routines work just like the corresponding 
-** [sqlite3_column_blob | sqlite3_column_* routines] except that 
-** these routines take a single [sqlite3_value*] pointer instead
-** of an [sqlite3_stmt*] pointer and an integer column number.
+** These routines work only with [protected sqlite3_value] objects.
+** Any attempt to use these routines on an [unprotected sqlite3_value]
+** object results in undefined behavior.
+**
+** These routines work just like the corresponding [column access functions]
+** except that  these routines take a single [protected sqlite3_value] object
+** pointer instead of a [sqlite3_stmt*] pointer and an integer column number.
 **
-** The sqlite3_value_text16() interface extracts a UTF16 string
+** The sqlite3_value_text16() interface extracts a UTF-16 string
 ** in the native byte-order of the host machine.  The
 ** sqlite3_value_text16be() and sqlite3_value_text16le() interfaces
-** extract UTF16 strings as big-endian and little-endian respectively.
+** extract UTF-16 strings as big-endian and little-endian respectively.
 **
 ** The sqlite3_value_numeric_type() interface attempts to apply
 ** numeric affinity to the value.  This means that an attempt is
 ** made to convert the value to an integer or floating point.  If
 ** such a conversion is possible without loss of information (in other
-** words if the value is a string that looks like a number)
-** then the conversion is done.  Otherwise no conversion occurs.  The 
-** [SQLITE_INTEGER | datatype] after conversion is returned.
+** words, if the value is a string that looks like a number)
+** then the conversion is performed.  Otherwise no conversion occurs.
+** The [SQLITE_INTEGER | datatype] after conversion is returned.
 **
-** Please pay particular attention to the fact that the pointer that
-** is returned from [sqlite3_value_blob()], [sqlite3_value_text()], or
+** Please pay particular attention to the fact that the pointer returned
+** from [sqlite3_value_blob()], [sqlite3_value_text()], or
 ** [sqlite3_value_text16()] can be invalidated by a subsequent call to
 ** [sqlite3_value_bytes()], [sqlite3_value_bytes16()], [sqlite3_value_text()],
-** or [sqlite3_value_text16()].  
+** or [sqlite3_value_text16()].
 **
 ** These routines must be called from the same thread as
-** the SQL function that supplied the sqlite3_value* parameters.
-** Or, if the sqlite3_value* argument comes from the [sqlite3_column_value()]
-** interface, then these routines should be called from the same thread
-** that ran [sqlite3_column_value()].
-**
+** the SQL function that supplied the [sqlite3_value*] parameters.
+**
+** INVARIANTS:
+**
+** {H15103} The [sqlite3_value_blob(V)] interface converts the
+**          [protected sqlite3_value] object V into a BLOB and then
+**          returns a pointer to the converted value.
+**
+** {H15106} The [sqlite3_value_bytes(V)] interface returns the
+**          number of bytes in the BLOB or string (exclusive of the
+**          zero terminator on the string) that was returned by the
+**          most recent call to [sqlite3_value_blob(V)] or
+**          [sqlite3_value_text(V)].
+**
+** {H15109} The [sqlite3_value_bytes16(V)] interface returns the
+**          number of bytes in the string (exclusive of the
+**          zero terminator on the string) that was returned by the
+**          most recent call to [sqlite3_value_text16(V)],
+**          [sqlite3_value_text16be(V)], or [sqlite3_value_text16le(V)].
+**
+** {H15112} The [sqlite3_value_double(V)] interface converts the
+**          [protected sqlite3_value] object V into a floating point value and
+**          returns a copy of that value.
+**
+** {H15115} The [sqlite3_value_int(V)] interface converts the
+**          [protected sqlite3_value] object V into a 64-bit signed integer and
+**          returns the lower 32 bits of that integer.
+**
+** {H15118} The [sqlite3_value_int64(V)] interface converts the
+**          [protected sqlite3_value] object V into a 64-bit signed integer and
+**          returns a copy of that integer.
+**
+** {H15121} The [sqlite3_value_text(V)] interface converts the
+**          [protected sqlite3_value] object V into a zero-terminated UTF-8
+**          string and returns a pointer to that string.
+**
+** {H15124} The [sqlite3_value_text16(V)] interface converts the
+**          [protected sqlite3_value] object V into a zero-terminated 2-byte
+**          aligned UTF-16 native byte order
+**          string and returns a pointer to that string.
+**
+** {H15127} The [sqlite3_value_text16be(V)] interface converts the
+**          [protected sqlite3_value] object V into a zero-terminated 2-byte
+**          aligned UTF-16 big-endian
+**          string and returns a pointer to that string.
+**
+** {H15130} The [sqlite3_value_text16le(V)] interface converts the
+**          [protected sqlite3_value] object V into a zero-terminated 2-byte
+**          aligned UTF-16 little-endian
+**          string and returns a pointer to that string.
+**
+** {H15133} The [sqlite3_value_type(V)] interface returns
+**          one of [SQLITE_NULL], [SQLITE_INTEGER], [SQLITE_FLOAT],
+**          [SQLITE_TEXT], or [SQLITE_BLOB] as appropriate for
+**          the [sqlite3_value] object V.
+**
+** {H15136} The [sqlite3_value_numeric_type(V)] interface converts
+**          the [protected sqlite3_value] object V into either an integer or
+**          a floating point value if it can do so without loss of
+**          information, and returns one of [SQLITE_NULL],
+**          [SQLITE_INTEGER], [SQLITE_FLOAT], [SQLITE_TEXT], or
+**          [SQLITE_BLOB] as appropriate for the
+**          [protected sqlite3_value] object V after the conversion attempt.
 */
 const void *sqlite3_value_blob(sqlite3_value*);
 int sqlite3_value_bytes(sqlite3_value*);
@@ -2508,96 +4075,168 @@ int sqlite3_value_type(sqlite3_value*);
 int sqlite3_value_numeric_type(sqlite3_value*);
 
 /*
-** CAPI3REF: Obtain Aggregate Function Context {F16210}
+** CAPI3REF: Obtain Aggregate Function Context {H16210} 
 **
 ** The implementation of aggregate SQL functions use this routine to allocate
-** a structure for storing their state.  
-** {F16211} The first time the sqlite3_aggregate_context() routine is
-** is called for a particular aggregate, SQLite allocates nBytes of memory
-** zeros that memory, and returns a pointer to it.
-** {F16212} On second and subsequent calls to sqlite3_aggregate_context()
-** for the same aggregate function index, the same buffer is returned. {END}
-** The implementation
-** of the aggregate can use the returned buffer to accumulate data.
-**
-** {F16213} SQLite automatically frees the allocated buffer when the aggregate
-** query concludes. {END}
-**
-** The first parameter should be a copy of the 
-** [sqlite3_context | SQL function context] that is the first
-** parameter to the callback routine that implements the aggregate
-** function.
+** a structure for storing their state.
+**
+** The first time the sqlite3_aggregate_context() routine is called for a
+** particular aggregate, SQLite allocates nBytes of memory, zeroes out that
+** memory, and returns a pointer to it. On second and subsequent calls to
+** sqlite3_aggregate_context() for the same aggregate function index,
+** the same buffer is returned. The implementation of the aggregate can use
+** the returned buffer to accumulate data.
+**
+** SQLite automatically frees the allocated buffer when the aggregate
+** query concludes.
+**
+** The first parameter should be a copy of the
+** [sqlite3_context | SQL function context] that is the first parameter
+** to the callback routine that implements the aggregate function.
 **
 ** This routine must be called from the same thread in which
 ** the aggregate SQL function is running.
+**
+** INVARIANTS:
+**
+** {H16211} The first invocation of [sqlite3_aggregate_context(C,N)] for
+**          a particular instance of an aggregate function (for a particular
+**          context C) causes SQLite to allocate N bytes of memory,
+**          zero that memory, and return a pointer to the allocated memory.
+**
+** {H16213} If a memory allocation error occurs during
+**          [sqlite3_aggregate_context(C,N)] then the function returns 0.
+**
+** {H16215} Second and subsequent invocations of
+**          [sqlite3_aggregate_context(C,N)] for the same context pointer C
+**          ignore the N parameter and return a pointer to the same
+**          block of memory returned by the first invocation.
+**
+** {H16217} The memory allocated by [sqlite3_aggregate_context(C,N)] is
+**          automatically freed on the next call to [sqlite3_reset()]
+**          or [sqlite3_finalize()] for the [prepared statement] containing
+**          the aggregate function associated with context C.
 */
 void *sqlite3_aggregate_context(sqlite3_context*, int nBytes);
 
 /*
-** CAPI3REF: User Data For Functions {F16240}
+** CAPI3REF: User Data For Functions {H16240} 
 **
-** {F16241} The sqlite3_user_data() interface returns a copy of
+** The sqlite3_user_data() interface returns a copy of
 ** the pointer that was the pUserData parameter (the 5th parameter)
-** of the the [sqlite3_create_function()]
+** of the [sqlite3_create_function()]
 ** and [sqlite3_create_function16()] routines that originally
 ** registered the application defined function. {END}
 **
-** {U16243} This routine must be called from the same thread in which
+** This routine must be called from the same thread in which
 ** the application-defined function is running.
+**
+** INVARIANTS:
+**
+** {H16243} The [sqlite3_user_data(C)] interface returns a copy of the
+**          P pointer from the [sqlite3_create_function(D,X,N,E,P,F,S,L)]
+**          or [sqlite3_create_function16(D,X,N,E,P,F,S,L)] call that
+**          registered the SQL function associated with [sqlite3_context] C.
 */
 void *sqlite3_user_data(sqlite3_context*);
 
 /*
-** CAPI3REF: Function Auxiliary Data {F16270}
+** CAPI3REF: Database Connection For Functions {H16250} 
+**
+** The sqlite3_context_db_handle() interface returns a copy of
+** the pointer to the [database connection] (the 1st parameter)
+** of the [sqlite3_create_function()]
+** and [sqlite3_create_function16()] routines that originally
+** registered the application defined function.
+**
+** INVARIANTS:
+**
+** {H16253} The [sqlite3_context_db_handle(C)] interface returns a copy of the
+**          D pointer from the [sqlite3_create_function(D,X,N,E,P,F,S,L)]
+**          or [sqlite3_create_function16(D,X,N,E,P,F,S,L)] call that
+**          registered the SQL function associated with [sqlite3_context] C.
+*/
+sqlite3 *sqlite3_context_db_handle(sqlite3_context*);
+
+/*
+** CAPI3REF: Function Auxiliary Data {H16270} 
 **
 ** The following two functions may be used by scalar SQL functions to
-** associate meta-data with argument values. If the same value is passed to
+** associate metadata with argument values. If the same value is passed to
 ** multiple invocations of the same SQL function during query execution, under
-** some circumstances the associated meta-data may be preserved. This may
+** some circumstances the associated metadata may be preserved. This may
 ** be used, for example, to add a regular-expression matching scalar
 ** function. The compiled version of the regular expression is stored as
-** meta-data associated with the SQL value passed as the regular expression
+** metadata associated with the SQL value passed as the regular expression
 ** pattern.  The compiled regular expression can be reused on multiple
 ** invocations of the same function so that the original pattern string
 ** does not need to be recompiled on each invocation.
 **
-** {F16271}
-** The sqlite3_get_auxdata() interface returns a pointer to the meta-data
+** The sqlite3_get_auxdata() interface returns a pointer to the metadata
 ** associated by the sqlite3_set_auxdata() function with the Nth argument
-** value to the application-defined function.
-** {F16272} If no meta-data has been ever been set for the Nth
-** argument of the function, or if the cooresponding function parameter
-** has changed since the meta-data was set, then sqlite3_get_auxdata()
-** returns a NULL pointer.
-**
-** {F16275} The sqlite3_set_auxdata() interface saves the meta-data
-** pointed to by its 3rd parameter as the meta-data for the N-th
-** argument of the application-defined function. {END} Subsequent
+** value to the application-defined function. If no metadata has been ever
+** been set for the Nth argument of the function, or if the corresponding
+** function parameter has changed since the meta-data was set,
+** then sqlite3_get_auxdata() returns a NULL pointer.
+**
+** The sqlite3_set_auxdata() interface saves the metadata
+** pointed to by its 3rd parameter as the metadata for the N-th
+** argument of the application-defined function.  Subsequent
 ** calls to sqlite3_get_auxdata() might return this data, if it has
-** not been destroyed. 
-** {F16277} If it is not NULL, SQLite will invoke the destructor 
+** not been destroyed.
+** If it is not NULL, SQLite will invoke the destructor
 ** function given by the 4th parameter to sqlite3_set_auxdata() on
-** the meta-data when the corresponding function parameter changes
-** or when the SQL statement completes, whichever comes first. {END}
+** the metadata when the corresponding function parameter changes
+** or when the SQL statement completes, whichever comes first.
+**
+** SQLite is free to call the destructor and drop metadata on any
+** parameter of any function at any time.  The only guarantee is that
+** the destructor will be called before the metadata is dropped.
 **
-** In practice, meta-data is preserved between function calls for
+** In practice, metadata is preserved between function calls for
 ** expressions that are constant at compile time. This includes literal
 ** values and SQL variables.
 **
 ** These routines must be called from the same thread in which
 ** the SQL function is running.
+**
+** INVARIANTS:
+**
+** {H16272} The [sqlite3_get_auxdata(C,N)] interface returns a pointer
+**          to metadata associated with the Nth parameter of the SQL function
+**          whose context is C, or NULL if there is no metadata associated
+**          with that parameter.
+**
+** {H16274} The [sqlite3_set_auxdata(C,N,P,D)] interface assigns a metadata
+**          pointer P to the Nth parameter of the SQL function with context C.
+**
+** {H16276} SQLite will invoke the destructor D with a single argument
+**          which is the metadata pointer P following a call to
+**          [sqlite3_set_auxdata(C,N,P,D)] when SQLite ceases to hold
+**          the metadata.
+**
+** {H16277} SQLite ceases to hold metadata for an SQL function parameter
+**          when the value of that parameter changes.
+**
+** {H16278} When [sqlite3_set_auxdata(C,N,P,D)] is invoked, the destructor
+**          is called for any prior metadata associated with the same function
+**          context C and parameter N.
+**
+** {H16279} SQLite will call destructors for any metadata it is holding
+**          in a particular [prepared statement] S when either
+**          [sqlite3_reset(S)] or [sqlite3_finalize(S)] is called.
 */
 void *sqlite3_get_auxdata(sqlite3_context*, int N);
 void sqlite3_set_auxdata(sqlite3_context*, int N, void*, void (*)(void*));
 
 
 /*
-** CAPI3REF: Constants Defining Special Destructor Behavior {F10280}
+** CAPI3REF: Constants Defining Special Destructor Behavior {H10280} 
 **
-** These are special value for the destructor that is passed in as the
+** These are special values for the destructor that is passed in as the
 ** final argument to routines like [sqlite3_result_blob()].  If the destructor
 ** argument is SQLITE_STATIC, it means that the content pointer is constant
-** and will never change.  It does not need to be destroyed.  The 
+** and will never change.  It does not need to be destroyed.  The
 ** SQLITE_TRANSIENT value means that the content will likely change in
 ** the near future and that SQLite should make its own private copy of
 ** the content before returning.
@@ -2610,104 +4249,204 @@ typedef void (*sqlite3_destructor_type)(void*);
 #define SQLITE_TRANSIENT   ((sqlite3_destructor_type)-1)
 
 /*
-** CAPI3REF: Setting The Result Of An SQL Function {F16400}
+** CAPI3REF: Setting The Result Of An SQL Function {H16400} 
 **
 ** These routines are used by the xFunc or xFinal callbacks that
 ** implement SQL functions and aggregates.  See
 ** [sqlite3_create_function()] and [sqlite3_create_function16()]
 ** for additional information.
 **
-** These functions work very much like the 
-** [sqlite3_bind_blob | sqlite3_bind_*] family of functions used
-** to bind values to host parameters in prepared statements.
-** Refer to the
-** [sqlite3_bind_blob | sqlite3_bind_* documentation] for
-** additional information.
+** These functions work very much like the [parameter binding] family of
+** functions used to bind values to host parameters in prepared statements.
+** Refer to the [SQL parameter] documentation for additional information.
 **
-** {F16402} The sqlite3_result_blob() interface sets the result from
-** an application defined function to be the BLOB whose content is pointed
+** The sqlite3_result_blob() interface sets the result from
+** an application-defined function to be the BLOB whose content is pointed
 ** to by the second parameter and which is N bytes long where N is the
-** third parameter. 
-** {F16403} The sqlite3_result_zeroblob() inerfaces set the result of
-** the application defined function to be a BLOB containing all zero
+** third parameter.
+**
+** The sqlite3_result_zeroblob() interfaces set the result of
+** the application-defined function to be a BLOB containing all zero
 ** bytes and N bytes in size, where N is the value of the 2nd parameter.
 **
-** {F16407} The sqlite3_result_double() interface sets the result from
-** an application defined function to be a floating point value specified
+** The sqlite3_result_double() interface sets the result from
+** an application-defined function to be a floating point value specified
 ** by its 2nd argument.
 **
-** {F16409} The sqlite3_result_error() and sqlite3_result_error16() functions
+** The sqlite3_result_error() and sqlite3_result_error16() functions
 ** cause the implemented SQL function to throw an exception.
-** {F16411} SQLite uses the string pointed to by the
+** SQLite uses the string pointed to by the
 ** 2nd parameter of sqlite3_result_error() or sqlite3_result_error16()
-** as the text of an error message. {F16412} SQLite interprets the error
-** message string from sqlite3_result_error() as UTF8.  {F16413} SQLite
-** interprets the string from sqlite3_result_error16() as UTF16 in native
-** byte order.  {F16414} If the third parameter to sqlite3_result_error()
+** as the text of an error message.  SQLite interprets the error
+** message string from sqlite3_result_error() as UTF-8. SQLite
+** interprets the string from sqlite3_result_error16() as UTF-16 in native
+** byte order.  If the third parameter to sqlite3_result_error()
 ** or sqlite3_result_error16() is negative then SQLite takes as the error
 ** message all text up through the first zero character.
-** {F16415} If the third parameter to sqlite3_result_error() or
+** If the third parameter to sqlite3_result_error() or
 ** sqlite3_result_error16() is non-negative then SQLite takes that many
 ** bytes (not characters) from the 2nd parameter as the error message.
-** {F16417} The sqlite3_result_error() and sqlite3_result_error16()
-** routines make a copy private copy of the error message text before
-** they return.  {END} Hence, the calling function can deallocate or
+** The sqlite3_result_error() and sqlite3_result_error16()
+** routines make a private copy of the error message text before
+** they return.  Hence, the calling function can deallocate or
 ** modify the text after they return without harm.
+** The sqlite3_result_error_code() function changes the error code
+** returned by SQLite as a result of an error in a function.  By default,
+** the error code is SQLITE_ERROR.  A subsequent call to sqlite3_result_error()
+** or sqlite3_result_error16() resets the error code to SQLITE_ERROR.
 **
-** {F16421} The sqlite3_result_toobig() interface causes SQLite
-** to throw an error indicating that a string or BLOB is to long
-** to represent.  {F16422} The sqlite3_result_nomem() interface
-** causes SQLite to throw an exception indicating that the a
-** memory allocation failed.
+** The sqlite3_result_toobig() interface causes SQLite to throw an error
+** indicating that a string or BLOB is to long to represent.
 **
-** {F16431} The sqlite3_result_int() interface sets the return value
+** The sqlite3_result_nomem() interface causes SQLite to throw an error
+** indicating that a memory allocation failed.
+**
+** The sqlite3_result_int() interface sets the return value
 ** of the application-defined function to be the 32-bit signed integer
 ** value given in the 2nd argument.
-** {F16432} The sqlite3_result_int64() interface sets the return value
+** The sqlite3_result_int64() interface sets the return value
 ** of the application-defined function to be the 64-bit signed integer
 ** value given in the 2nd argument.
 **
-** {F16437} The sqlite3_result_null() interface sets the return value
+** The sqlite3_result_null() interface sets the return value
 ** of the application-defined function to be NULL.
 **
-** {F16441} The sqlite3_result_text(), sqlite3_result_text16(), 
+** The sqlite3_result_text(), sqlite3_result_text16(),
 ** sqlite3_result_text16le(), and sqlite3_result_text16be() interfaces
 ** set the return value of the application-defined function to be
 ** a text string which is represented as UTF-8, UTF-16 native byte order,
 ** UTF-16 little endian, or UTF-16 big endian, respectively.
-** {F16442} SQLite takes the text result from the application from
+** SQLite takes the text result from the application from
 ** the 2nd parameter of the sqlite3_result_text* interfaces.
-** {F16444} If the 3rd parameter to the sqlite3_result_text* interfaces
-** is negative, then SQLite takes result text from the 2nd parameter 
+** If the 3rd parameter to the sqlite3_result_text* interfaces
+** is negative, then SQLite takes result text from the 2nd parameter
 ** through the first zero character.
-** {F16447} If the 3rd parameter to the sqlite3_result_text* interfaces
+** If the 3rd parameter to the sqlite3_result_text* interfaces
 ** is non-negative, then as many bytes (not characters) of the text
 ** pointed to by the 2nd parameter are taken as the application-defined
 ** function result.
-** {F16451} If the 4th parameter to the sqlite3_result_text* interfaces
+** If the 4th parameter to the sqlite3_result_text* interfaces
 ** or sqlite3_result_blob is a non-NULL pointer, then SQLite calls that
-** function as the destructor on the text or blob result when it has
-** finished using that result.
-** {F16453} If the 4th parameter to the sqlite3_result_text* interfaces
-** or sqlite3_result_blob is the special constant SQLITE_STATIC, then
-** SQLite assumes that the text or blob result is constant space and
-** does not copy the space or call a destructor when it has
+** function as the destructor on the text or BLOB result when it has
 ** finished using that result.
-** {F16454} If the 4th parameter to the sqlite3_result_text* interfaces
+** If the 4th parameter to the sqlite3_result_text* interfaces or
+** sqlite3_result_blob is the special constant SQLITE_STATIC, then SQLite
+** assumes that the text or BLOB result is in constant space and does not
+** copy the it or call a destructor when it has finished using that result.
+** If the 4th parameter to the sqlite3_result_text* interfaces
 ** or sqlite3_result_blob is the special constant SQLITE_TRANSIENT
 ** then SQLite makes a copy of the result into space obtained from
 ** from [sqlite3_malloc()] before it returns.
 **
-** {F16461} The sqlite3_result_value() interface sets the result of
-** the application-defined function to be a copy the [sqlite3_value]
-** object specified by the 2nd parameter.  {F16463} The
+** The sqlite3_result_value() interface sets the result of
+** the application-defined function to be a copy the
+** [unprotected sqlite3_value] object specified by the 2nd parameter.  The
 ** sqlite3_result_value() interface makes a copy of the [sqlite3_value]
-** so that [sqlite3_value] specified in the parameter may change or
+** so that the [sqlite3_value] specified in the parameter may change or
 ** be deallocated after sqlite3_result_value() returns without harm.
+** A [protected sqlite3_value] object may always be used where an
+** [unprotected sqlite3_value] object is required, so either
+** kind of [sqlite3_value] object can be used with this interface.
 **
-** {U16491} These routines are called from within the different thread 
-** than the one containing the application-defined function that recieved
+** If these routines are called from within the different thread
+** than the one containing the application-defined function that received
 ** the [sqlite3_context] pointer, the results are undefined.
+**
+** INVARIANTS:
+**
+** {H16403} The default return value from any SQL function is NULL.
+**
+** {H16406} The [sqlite3_result_blob(C,V,N,D)] interface changes the
+**          return value of function C to be a BLOB that is N bytes
+**          in length and with content pointed to by V.
+**
+** {H16409} The [sqlite3_result_double(C,V)] interface changes the
+**          return value of function C to be the floating point value V.
+**
+** {H16412} The [sqlite3_result_error(C,V,N)] interface changes the return
+**          value of function C to be an exception with error code
+**          [SQLITE_ERROR] and a UTF-8 error message copied from V up to the
+**          first zero byte or until N bytes are read if N is positive.
+**
+** {H16415} The [sqlite3_result_error16(C,V,N)] interface changes the return
+**          value of function C to be an exception with error code
+**          [SQLITE_ERROR] and a UTF-16 native byte order error message
+**          copied from V up to the first zero terminator or until N bytes
+**          are read if N is positive.
+**
+** {H16418} The [sqlite3_result_error_toobig(C)] interface changes the return
+**          value of the function C to be an exception with error code
+**          [SQLITE_TOOBIG] and an appropriate error message.
+**
+** {H16421} The [sqlite3_result_error_nomem(C)] interface changes the return
+**          value of the function C to be an exception with error code
+**          [SQLITE_NOMEM] and an appropriate error message.
+**
+** {H16424} The [sqlite3_result_error_code(C,E)] interface changes the return
+**          value of the function C to be an exception with error code E.
+**          The error message text is unchanged.
+**
+** {H16427} The [sqlite3_result_int(C,V)] interface changes the
+**          return value of function C to be the 32-bit integer value V.
+**
+** {H16430} The [sqlite3_result_int64(C,V)] interface changes the
+**          return value of function C to be the 64-bit integer value V.
+**
+** {H16433} The [sqlite3_result_null(C)] interface changes the
+**          return value of function C to be NULL.
+**
+** {H16436} The [sqlite3_result_text(C,V,N,D)] interface changes the
+**          return value of function C to be the UTF-8 string
+**          V up to the first zero if N is negative
+**          or the first N bytes of V if N is non-negative.
+**
+** {H16439} The [sqlite3_result_text16(C,V,N,D)] interface changes the
+**          return value of function C to be the UTF-16 native byte order
+**          string V up to the first zero if N is negative
+**          or the first N bytes of V if N is non-negative.
+**
+** {H16442} The [sqlite3_result_text16be(C,V,N,D)] interface changes the
+**          return value of function C to be the UTF-16 big-endian
+**          string V up to the first zero if N is negative
+**          or the first N bytes or V if N is non-negative.
+**
+** {H16445} The [sqlite3_result_text16le(C,V,N,D)] interface changes the
+**          return value of function C to be the UTF-16 little-endian
+**          string V up to the first zero if N is negative
+**          or the first N bytes of V if N is non-negative.
+**
+** {H16448} The [sqlite3_result_value(C,V)] interface changes the
+**          return value of function C to be the [unprotected sqlite3_value]
+**          object V.
+**
+** {H16451} The [sqlite3_result_zeroblob(C,N)] interface changes the
+**          return value of function C to be an N-byte BLOB of all zeros.
+**
+** {H16454} The [sqlite3_result_error()] and [sqlite3_result_error16()]
+**          interfaces make a copy of their error message strings before
+**          returning.
+**
+** {H16457} If the D destructor parameter to [sqlite3_result_blob(C,V,N,D)],
+**          [sqlite3_result_text(C,V,N,D)], [sqlite3_result_text16(C,V,N,D)],
+**          [sqlite3_result_text16be(C,V,N,D)], or
+**          [sqlite3_result_text16le(C,V,N,D)] is the constant [SQLITE_STATIC]
+**          then no destructor is ever called on the pointer V and SQLite
+**          assumes that V is immutable.
+**
+** {H16460} If the D destructor parameter to [sqlite3_result_blob(C,V,N,D)],
+**          [sqlite3_result_text(C,V,N,D)], [sqlite3_result_text16(C,V,N,D)],
+**          [sqlite3_result_text16be(C,V,N,D)], or
+**          [sqlite3_result_text16le(C,V,N,D)] is the constant
+**          [SQLITE_TRANSIENT] then the interfaces makes a copy of the
+**          content of V and retains the copy.
+**
+** {H16463} If the D destructor parameter to [sqlite3_result_blob(C,V,N,D)],
+**          [sqlite3_result_text(C,V,N,D)], [sqlite3_result_text16(C,V,N,D)],
+**          [sqlite3_result_text16be(C,V,N,D)], or
+**          [sqlite3_result_text16le(C,V,N,D)] is some value other than
+**          the constants [SQLITE_STATIC] and [SQLITE_TRANSIENT] then
+**          SQLite will invoke the destructor D with V as its only argument
+**          when it has finished with the V value.
 */
 void sqlite3_result_blob(sqlite3_context*, const void*, int, void(*)(void*));
 void sqlite3_result_double(sqlite3_context*, double);
@@ -2715,6 +4454,7 @@ void sqlite3_result_error(sqlite3_context*, const char*, int);
 void sqlite3_result_error16(sqlite3_context*, const void*, int);
 void sqlite3_result_error_toobig(sqlite3_context*);
 void sqlite3_result_error_nomem(sqlite3_context*);
+void sqlite3_result_error_code(sqlite3_context*, int);
 void sqlite3_result_int(sqlite3_context*, int);
 void sqlite3_result_int64(sqlite3_context*, sqlite3_int64);
 void sqlite3_result_null(sqlite3_context*);
@@ -2726,54 +4466,95 @@ void sqlite3_result_value(sqlite3_context*, sqlite3_value*);
 void sqlite3_result_zeroblob(sqlite3_context*, int n);
 
 /*
-** CAPI3REF: Define New Collating Sequences {F16600}
+** CAPI3REF: Define New Collating Sequences {H16600} 
 **
-** {F16601}
 ** These functions are used to add new collation sequences to the
-** [sqlite3*] handle specified as the first argument. 
+** [database connection] specified as the first argument.
 **
-** {F16602}
 ** The name of the new collation sequence is specified as a UTF-8 string
 ** for sqlite3_create_collation() and sqlite3_create_collation_v2()
-** and a UTF-16 string for sqlite3_create_collation16(). {F16603} In all cases
+** and a UTF-16 string for sqlite3_create_collation16(). In all cases
 ** the name is passed as the second function argument.
 **
-** {F16604}
 ** The third argument may be one of the constants [SQLITE_UTF8],
 ** [SQLITE_UTF16LE] or [SQLITE_UTF16BE], indicating that the user-supplied
 ** routine expects to be passed pointers to strings encoded using UTF-8,
-** UTF-16 little-endian or UTF-16 big-endian respectively. {F16605} The
+** UTF-16 little-endian, or UTF-16 big-endian, respectively. The
 ** third argument might also be [SQLITE_UTF16_ALIGNED] to indicate that
 ** the routine expects pointers to 16-bit word aligned strings
-** of UTF16 in the native byte order of the host computer.
+** of UTF-16 in the native byte order of the host computer.
 **
-** {F16607}
 ** A pointer to the user supplied routine must be passed as the fifth
-** argument. {F16609} If it is NULL, this is the same as deleting the collation
+** argument.  If it is NULL, this is the same as deleting the collation
 ** sequence (so that SQLite cannot call it anymore).
-** {F16611} Each time the application
-** supplied function is invoked, it is passed a copy of the void* passed as
-** the fourth argument to sqlite3_create_collation() or
-** sqlite3_create_collation16() as its first parameter.
+** Each time the application supplied function is invoked, it is passed
+** as its first parameter a copy of the void* passed as the fourth argument
+** to sqlite3_create_collation() or sqlite3_create_collation16().
 **
-** {F16612}
 ** The remaining arguments to the application-supplied routine are two strings,
-** each represented by a [length, data] pair and encoded in the encoding
+** each represented by a (length, data) pair and encoded in the encoding
 ** that was passed as the third argument when the collation sequence was
-** registered. {END} The application defined collation routine should
-** return negative, zero or positive if
-** the first string is less than, equal to, or greater than the second
-** string. i.e. (STRING1 - STRING2).
+** registered. {END}  The application defined collation routine should
+** return negative, zero or positive if the first string is less than,
+** equal to, or greater than the second string. i.e. (STRING1 - STRING2).
 **
-** {F16615}
 ** The sqlite3_create_collation_v2() works like sqlite3_create_collation()
-** excapt that it takes an extra argument which is a destructor for
-** the collation.  {F16617} The destructor is called when the collation is
+** except that it takes an extra argument which is a destructor for
+** the collation.  The destructor is called when the collation is
 ** destroyed and is passed a copy of the fourth parameter void* pointer
 ** of the sqlite3_create_collation_v2().
-** {F16618}  Collations are destroyed when
-** they are overridden by later calls to the collation creation functions
-** or when the [sqlite3*] database handle is closed using [sqlite3_close()].
+** Collations are destroyed when they are overridden by later calls to the
+** collation creation functions or when the [database connection] is closed
+** using [sqlite3_close()].
+**
+** INVARIANTS:
+**
+** {H16603} A successful call to the
+**          [sqlite3_create_collation_v2(B,X,E,P,F,D)] interface
+**          registers function F as the comparison function used to
+**          implement collation X on the [database connection] B for
+**          databases having encoding E.
+**
+** {H16604} SQLite understands the X parameter to
+**          [sqlite3_create_collation_v2(B,X,E,P,F,D)] as a zero-terminated
+**          UTF-8 string in which case is ignored for ASCII characters and
+**          is significant for non-ASCII characters.
+**
+** {H16606} Successive calls to [sqlite3_create_collation_v2(B,X,E,P,F,D)]
+**          with the same values for B, X, and E, override prior values
+**          of P, F, and D.
+**
+** {H16609} If the destructor D in [sqlite3_create_collation_v2(B,X,E,P,F,D)]
+**          is not NULL then it is called with argument P when the
+**          collating function is dropped by SQLite.
+**
+** {H16612} A collating function is dropped when it is overloaded.
+**
+** {H16615} A collating function is dropped when the database connection
+**          is closed using [sqlite3_close()].
+**
+** {H16618} The pointer P in [sqlite3_create_collation_v2(B,X,E,P,F,D)]
+**          is passed through as the first parameter to the comparison
+**          function F for all subsequent invocations of F.
+**
+** {H16621} A call to [sqlite3_create_collation(B,X,E,P,F)] is exactly
+**          the same as a call to [sqlite3_create_collation_v2()] with
+**          the same parameters and a NULL destructor.
+**
+** {H16624} Following a [sqlite3_create_collation_v2(B,X,E,P,F,D)],
+**          SQLite uses the comparison function F for all text comparison
+**          operations on the [database connection] B on text values that
+**          use the collating sequence named X.
+**
+** {H16627} The [sqlite3_create_collation16(B,X,E,P,F)] works the same
+**          as [sqlite3_create_collation(B,X,E,P,F)] except that the
+**          collation name X is understood as UTF-16 in native byte order
+**          instead of UTF-8.
+**
+** {H16630} When multiple comparison functions are available for the same
+**          collating sequence, SQLite chooses the one whose text encoding
+**          requires the least amount of conversion from the default
+**          text encoding of the database.
 */
 int sqlite3_create_collation(
   sqlite3*, 
@@ -2792,40 +4573,56 @@ int sqlite3_create_collation_v2(
 );
 int sqlite3_create_collation16(
   sqlite3*, 
-  const char *zName, 
+  const void *zName,
   int eTextRep, 
   void*,
   int(*xCompare)(void*,int,const void*,int,const void*)
 );
 
 /*
-** CAPI3REF: Collation Needed Callbacks {F16700}
+** CAPI3REF: Collation Needed Callbacks {H16700} 
 **
-** {F16701}
 ** To avoid having to register all collation sequences before a database
 ** can be used, a single callback function may be registered with the
-** database handle to be called whenever an undefined collation sequence is
-** required.
+** [database connection] to be called whenever an undefined collation
+** sequence is required.
 **
-** {F16702}
 ** If the function is registered using the sqlite3_collation_needed() API,
 ** then it is passed the names of undefined collation sequences as strings
-** encoded in UTF-8. {F16703} If sqlite3_collation_needed16() is used, the names
-** are passed as UTF-16 in machine native byte order. {F16704} A call to either
-** function replaces any existing callback.
+** encoded in UTF-8. {H16703} If sqlite3_collation_needed16() is used,
+** the names are passed as UTF-16 in machine native byte order.
+** A call to either function replaces any existing callback.
 **
-** {F16705} When the callback is invoked, the first argument passed is a copy
+** When the callback is invoked, the first argument passed is a copy
 ** of the second argument to sqlite3_collation_needed() or
-** sqlite3_collation_needed16(). {F16706} The second argument is the database
-** handle.  {F16707} The third argument is one of [SQLITE_UTF8],
-** [SQLITE_UTF16BE], or [SQLITE_UTF16LE], indicating the most
-** desirable form of the collation sequence function required.
-** {F16708} The fourth parameter is the name of the
-** required collation sequence. {END}
+** sqlite3_collation_needed16().  The second argument is the database
+** connection.  The third argument is one of [SQLITE_UTF8], [SQLITE_UTF16BE],
+** or [SQLITE_UTF16LE], indicating the most desirable form of the collation
+** sequence function required.  The fourth parameter is the name of the
+** required collation sequence.
 **
 ** The callback function should register the desired collation using
 ** [sqlite3_create_collation()], [sqlite3_create_collation16()], or
 ** [sqlite3_create_collation_v2()].
+**
+** INVARIANTS:
+**
+** {H16702} A successful call to [sqlite3_collation_needed(D,P,F)]
+**          or [sqlite3_collation_needed16(D,P,F)] causes
+**          the [database connection] D to invoke callback F with first
+**          parameter P whenever it needs a comparison function for a
+**          collating sequence that it does not know about.
+**
+** {H16704} Each successful call to [sqlite3_collation_needed()] or
+**          [sqlite3_collation_needed16()] overrides the callback registered
+**          on the same [database connection] by prior calls to either
+**          interface.
+**
+** {H16706} The name of the requested collating function passed in the
+**          4th parameter to the callback is in UTF-8 if the callback
+**          was registered using [sqlite3_collation_needed()] and
+**          is in UTF-16 native byte order if the callback was
+**          registered using [sqlite3_collation_needed16()].
 */
 int sqlite3_collation_needed(
   sqlite3*, 
@@ -2864,32 +4661,42 @@ int sqlite3_rekey(
 );
 
 /*
-** CAPI3REF:  Suspend Execution For A Short Time {F10530}
+** CAPI3REF: Suspend Execution For A Short Time {H10530} 
 **
-** {F10531} The sqlite3_sleep() function
-** causes the current thread to suspend execution
+** The sqlite3_sleep() function causes the current thread to suspend execution
 ** for at least a number of milliseconds specified in its parameter.
 **
-** {F10532} If the operating system does not support sleep requests with 
-** millisecond time resolution, then the time will be rounded up to 
-** the nearest second. {F10533} The number of milliseconds of sleep actually 
+** If the operating system does not support sleep requests with
+** millisecond time resolution, then the time will be rounded up to
+** the nearest second. The number of milliseconds of sleep actually
 ** requested from the operating system is returned.
 **
-** {F10534} SQLite implements this interface by calling the xSleep()
-** method of the default [sqlite3_vfs] object. {END}
+** SQLite implements this interface by calling the xSleep()
+** method of the default [sqlite3_vfs] object.
+**
+** INVARIANTS:
+**
+** {H10533} The [sqlite3_sleep(M)] interface invokes the xSleep
+**          method of the default [sqlite3_vfs|VFS] in order to
+**          suspend execution of the current thread for at least
+**          M milliseconds.
+**
+** {H10536} The [sqlite3_sleep(M)] interface returns the number of
+**          milliseconds of sleep actually requested of the operating
+**          system, which might be larger than the parameter M.
 */
 int sqlite3_sleep(int);
 
 /*
-** CAPI3REF:  Name Of The Folder Holding Temporary Files {F10310}
+** CAPI3REF: Name Of The Folder Holding Temporary Files {H10310} 
 **
 ** If this global variable is made to point to a string which is
-** the name of a folder (a.ka. directory), then all temporary files
+** the name of a folder (a.k.a. directory), then all temporary files
 ** created by SQLite will be placed in that directory.  If this variable
-** is NULL pointer, then SQLite does a search for an appropriate temporary
-** file directory.
+** is a NULL pointer, then SQLite performs a search for an appropriate
+** temporary file directory.
 **
-** It is not safe to modify this variable once a database connection
+** It is not safe to modify this variable once a [database connection]
 ** has been opened.  It is intended that this variable be set once
 ** as part of process initialization and before any SQLite interface
 ** routines have been call and remain unchanged thereafter.
@@ -2897,104 +4704,222 @@ int sqlite3_sleep(int);
 SQLITE_EXTERN char *sqlite3_temp_directory;
 
 /*
-** CAPI3REF:  Test To See If The Database Is In Auto-Commit Mode {F12930}
+** CAPI3REF: Test For Auto-Commit Mode {H12930} 
+** KEYWORDS: {autocommit mode}
 **
-** {F12931} The sqlite3_get_autocommit() interfaces returns non-zero or
+** The sqlite3_get_autocommit() interface returns non-zero or
 ** zero if the given database connection is or is not in autocommit mode,
-** respectively. {F12932}  Autocommit mode is on
-** by default.  {F12933} Autocommit mode is disabled by a BEGIN statement.
-** {F12934} Autocommit mode is reenabled by a COMMIT or ROLLBACK. {END}
+** respectively.  Autocommit mode is on by default.
+** Autocommit mode is disabled by a [BEGIN] statement.
+** Autocommit mode is re-enabled by a [COMMIT] or [ROLLBACK].
 **
 ** If certain kinds of errors occur on a statement within a multi-statement
-** transactions (errors including [SQLITE_FULL], [SQLITE_IOERR], 
+** transaction (errors including [SQLITE_FULL], [SQLITE_IOERR],
 ** [SQLITE_NOMEM], [SQLITE_BUSY], and [SQLITE_INTERRUPT]) then the
-** transaction might be rolled back automatically.  {F12935} The only way to
-** find out if SQLite automatically rolled back the transaction after
-** an error is to use this function. {END}
+** transaction might be rolled back automatically.  The only way to
+** find out whether SQLite automatically rolled back the transaction after
+** an error is to use this function.
+**
+** INVARIANTS:
+**
+** {H12931} The [sqlite3_get_autocommit(D)] interface returns non-zero or
+**          zero if the [database connection] D is or is not in autocommit
+**          mode, respectively.
+**
+** {H12932} Autocommit mode is on by default.
 **
-** {U12936} If another thread changes the autocommit status of the database
-** connection while this routine is running, then the return value
-** is undefined. {END}
+** {H12933} Autocommit mode is disabled by a successful [BEGIN] statement.
+**
+** {H12934} Autocommit mode is enabled by a successful [COMMIT] or [ROLLBACK]
+**          statement.
+**
+** ASSUMPTIONS:
+**
+** {A12936} If another thread changes the autocommit status of the database
+**          connection while this routine is running, then the return value
+**          is undefined.
 */
 int sqlite3_get_autocommit(sqlite3*);
 
 /*
-** CAPI3REF:  Find The Database Handle Of A Prepared Statement {F13120}
+** CAPI3REF: Find The Database Handle Of A Prepared Statement {H13120} 
+**
+** The sqlite3_db_handle interface returns the [database connection] handle
+** to which a [prepared statement] belongs.  The database handle returned by
+** sqlite3_db_handle is the same database handle that was the first argument
+** to the [sqlite3_prepare_v2()] call (or its variants) that was used to
+** create the statement in the first place.
 **
-** {F13121} The sqlite3_db_handle interface
-** returns the [sqlite3*] database handle to which a
-** [sqlite3_stmt | prepared statement] belongs.
-** {F13122} the database handle returned by sqlite3_db_handle
-** is the same database handle that was
-** the first argument to the [sqlite3_prepare_v2()] or its variants
-** that was used to create the statement in the first place.
+** INVARIANTS:
+**
+** {H13123} The [sqlite3_db_handle(S)] interface returns a pointer
+**          to the [database connection] associated with the
+**          [prepared statement] S.
 */
 sqlite3 *sqlite3_db_handle(sqlite3_stmt*);
 
+/*
+** CAPI3REF: Find the next prepared statement {H13140} 
+**
+** This interface returns a pointer to the next [prepared statement] after
+** pStmt associated with the [database connection] pDb.  If pStmt is NULL
+** then this interface returns a pointer to the first prepared statement
+** associated with the database connection pDb.  If no prepared statement
+** satisfies the conditions of this routine, it returns NULL.
+**
+** INVARIANTS:
+**
+** {H13143} If D is a [database connection] that holds one or more
+**          unfinalized [prepared statements] and S is a NULL pointer,
+**          then [sqlite3_next_stmt(D, S)] routine shall return a pointer
+**          to one of the prepared statements associated with D.
+**
+** {H13146} If D is a [database connection] that holds no unfinalized
+**          [prepared statements] and S is a NULL pointer, then
+**          [sqlite3_next_stmt(D, S)] routine shall return a NULL pointer.
+**
+** {H13149} If S is a [prepared statement] in the [database connection] D
+**          and S is not the last prepared statement in D, then
+**          [sqlite3_next_stmt(D, S)] routine shall return a pointer
+**          to the next prepared statement in D after S.
+**
+** {H13152} If S is the last [prepared statement] in the
+**          [database connection] D then the [sqlite3_next_stmt(D, S)]
+**          routine shall return a NULL pointer.
+**
+** ASSUMPTIONS:
+**
+** {A13154} The [database connection] pointer D in a call to
+**          [sqlite3_next_stmt(D,S)] must refer to an open database
+**          connection and in particular must not be a NULL pointer.
+*/
+sqlite3_stmt *sqlite3_next_stmt(sqlite3 *pDb, sqlite3_stmt *pStmt);
 
 /*
-** CAPI3REF: Commit And Rollback Notification Callbacks {F12950}
+** CAPI3REF: Commit And Rollback Notification Callbacks {H12950} 
 **
-** {F12951} The sqlite3_commit_hook() interface registers a callback
+** The sqlite3_commit_hook() interface registers a callback
 ** function to be invoked whenever a transaction is committed.
-** {F12952} Any callback set by a previous call to sqlite3_commit_hook()
+** Any callback set by a previous call to sqlite3_commit_hook()
 ** for the same database connection is overridden.
-** {F12953} The sqlite3_rollback_hook() interface registers a callback
+** The sqlite3_rollback_hook() interface registers a callback
 ** function to be invoked whenever a transaction is committed.
-** {F12954} Any callback set by a previous call to sqlite3_commit_hook()
+** Any callback set by a previous call to sqlite3_commit_hook()
 ** for the same database connection is overridden.
-** {F12956} The pArg argument is passed through
-** to the callback.  {F12957} If the callback on a commit hook function 
-** returns non-zero, then the commit is converted into a rollback.
+** The pArg argument is passed through to the callback.
+** If the callback on a commit hook function returns non-zero,
+** then the commit is converted into a rollback.
 **
-** {F12958} If another function was previously registered, its
+** If another function was previously registered, its
 ** pArg value is returned.  Otherwise NULL is returned.
 **
-** {F12959} Registering a NULL function disables the callback.
+** Registering a NULL function disables the callback.
 **
-** {F12961} For the purposes of this API, a transaction is said to have been 
+** For the purposes of this API, a transaction is said to have been
 ** rolled back if an explicit "ROLLBACK" statement is executed, or
 ** an error or constraint causes an implicit rollback to occur.
-** {F12962} The rollback callback is not invoked if a transaction is
+** The rollback callback is not invoked if a transaction is
 ** automatically rolled back because the database connection is closed.
-** {F12964} The rollback callback is not invoked if a transaction is
+** The rollback callback is not invoked if a transaction is
 ** rolled back because a commit callback returned non-zero.
-**  Check on this  {END}
+**  Check on this 
+**
+** INVARIANTS:
 **
-** These are experimental interfaces and are subject to change.
+** {H12951} The [sqlite3_commit_hook(D,F,P)] interface registers the
+**          callback function F to be invoked with argument P whenever
+**          a transaction commits on the [database connection] D.
+**
+** {H12952} The [sqlite3_commit_hook(D,F,P)] interface returns the P argument
+**          from the previous call with the same [database connection] D,
+**          or NULL on the first call for a particular database connection D.
+**
+** {H12953} Each call to [sqlite3_commit_hook()] overwrites the callback
+**          registered by prior calls.
+**
+** {H12954} If the F argument to [sqlite3_commit_hook(D,F,P)] is NULL
+**          then the commit hook callback is canceled and no callback
+**          is invoked when a transaction commits.
+**
+** {H12955} If the commit callback returns non-zero then the commit is
+**          converted into a rollback.
+**
+** {H12961} The [sqlite3_rollback_hook(D,F,P)] interface registers the
+**          callback function F to be invoked with argument P whenever
+**          a transaction rolls back on the [database connection] D.
+**
+** {H12962} The [sqlite3_rollback_hook(D,F,P)] interface returns the P
+**          argument from the previous call with the same
+**          [database connection] D, or NULL on the first call
+**          for a particular database connection D.
+**
+** {H12963} Each call to [sqlite3_rollback_hook()] overwrites the callback
+**          registered by prior calls.
+**
+** {H12964} If the F argument to [sqlite3_rollback_hook(D,F,P)] is NULL
+**          then the rollback hook callback is canceled and no callback
+**          is invoked when a transaction rolls back.
 */
 void *sqlite3_commit_hook(sqlite3*, int(*)(void*), void*);
 void *sqlite3_rollback_hook(sqlite3*, void(*)(void *), void*);
 
 /*
-** CAPI3REF: Data Change Notification Callbacks {F12970}
-**
-** {F12971} The sqlite3_update_hook() interface
-** registers a callback function with the database connection identified by the 
-** first argument to be invoked whenever a row is updated, inserted or deleted.
-** {F12972} Any callback set by a previous call to this function for the same 
-** database connection is overridden.
-**
-** {F12974} The second argument is a pointer to the function to invoke when a 
-** row is updated, inserted or deleted. 
-** {F12976} The first argument to the callback is
-** a copy of the third argument to sqlite3_update_hook().
-** {F12977} The second callback 
-** argument is one of [SQLITE_INSERT], [SQLITE_DELETE] or [SQLITE_UPDATE],
-** depending on the operation that caused the callback to be invoked.
-** {F12978} The third and 
-** fourth arguments to the callback contain pointers to the database and 
-** table name containing the affected row.
-** {F12979} The final callback parameter is 
-** the rowid of the row.
-** {F12981} In the case of an update, this is the rowid after 
-** the update takes place.
-**
-** {F12983} The update hook is not invoked when internal system tables are
+** CAPI3REF: Data Change Notification Callbacks {H12970} 
+**
+** The sqlite3_update_hook() interface registers a callback function
+** with the [database connection] identified by the first argument
+** to be invoked whenever a row is updated, inserted or deleted.
+** Any callback set by a previous call to this function
+** for the same database connection is overridden.
+**
+** The second argument is a pointer to the function to invoke when a
+** row is updated, inserted or deleted.
+** The first argument to the callback is a copy of the third argument
+** to sqlite3_update_hook().
+** The second callback argument is one of [SQLITE_INSERT], [SQLITE_DELETE],
+** or [SQLITE_UPDATE], depending on the operation that caused the callback
+** to be invoked.
+** The third and fourth arguments to the callback contain pointers to the
+** database and table name containing the affected row.
+** The final callback parameter is the rowid of the row. In the case of
+** an update, this is the rowid after the update takes place.
+**
+** The update hook is not invoked when internal system tables are
 ** modified (i.e. sqlite_master and sqlite_sequence).
 **
-** {F12984} If another function was previously registered, its pArg value
-** is returned.  {F12985} Otherwise NULL is returned.
+** If another function was previously registered, its pArg value
+** is returned.  Otherwise NULL is returned.
+**
+** INVARIANTS:
+**
+** {H12971} The [sqlite3_update_hook(D,F,P)] interface causes the callback
+**          function F to be invoked with first parameter P whenever
+**          a table row is modified, inserted, or deleted on
+**          the [database connection] D.
+**
+** {H12973} The [sqlite3_update_hook(D,F,P)] interface returns the value
+**          of P for the previous call on the same [database connection] D,
+**          or NULL for the first call.
+**
+** {H12975} If the update hook callback F in [sqlite3_update_hook(D,F,P)]
+**          is NULL then the no update callbacks are made.
+**
+** {H12977} Each call to [sqlite3_update_hook(D,F,P)] overrides prior calls
+**          to the same interface on the same [database connection] D.
+**
+** {H12979} The update hook callback is not invoked when internal system
+**          tables such as sqlite_master and sqlite_sequence are modified.
+**
+** {H12981} The second parameter to the update callback
+**          is one of [SQLITE_INSERT], [SQLITE_DELETE] or [SQLITE_UPDATE],
+**          depending on the operation that caused the callback to be invoked.
+**
+** {H12983} The third and fourth arguments to the callback contain pointers
+**          to zero-terminated UTF-8 strings which are the names of the
+**          database and table that is being updated.
+
+** {H12985} The final callback parameter is the rowid of the row after
+**          the change occurs.
 */
 void *sqlite3_update_hook(
   sqlite3*, 
@@ -3003,135 +4928,177 @@ void *sqlite3_update_hook(
 );
 
 /*
-** CAPI3REF:  Enable Or Disable Shared Pager Cache {F10330}
+** CAPI3REF: Enable Or Disable Shared Pager Cache {H10330} 
+** KEYWORDS: {shared cache} {shared cache mode}
 **
-** {F10331}
 ** This routine enables or disables the sharing of the database cache
-** and schema data structures between connections to the same database.
-** {F10332}
-** Sharing is enabled if the argument is true and disabled if the argument
-** is false.
+** and schema data structures between [database connection | connections]
+** to the same database. Sharing is enabled if the argument is true
+** and disabled if the argument is false.
 **
-** {F10333} Cache sharing is enabled and disabled
-** for an entire process. {END} This is a change as of SQLite version 3.5.0.
-** In prior versions of SQLite, sharing was
-** enabled or disabled for each thread separately.
+** Cache sharing is enabled and disabled for an entire process. {END}
+** This is a change as of SQLite version 3.5.0. In prior versions of SQLite,
+** sharing was enabled or disabled for each thread separately.
 **
-** {F10334}
 ** The cache sharing mode set by this interface effects all subsequent
 ** calls to [sqlite3_open()], [sqlite3_open_v2()], and [sqlite3_open16()].
-** {F10335} Existing database connections continue use the sharing mode
-** that was in effect at the time they were opened. {END}
+** Existing database connections continue use the sharing mode
+** that was in effect at the time they were opened.
 **
-** Virtual tables cannot be used with a shared cache.  {F10336} When shared
+** Virtual tables cannot be used with a shared cache.  When shared
 ** cache is enabled, the [sqlite3_create_module()] API used to register
-** virtual tables will always return an error. {END}
+** virtual tables will always return an error.
 **
-** {F10337} This routine returns [SQLITE_OK] if shared cache was
-** enabled or disabled successfully.  {F10338} An [SQLITE_ERROR | error code]
-** is returned otherwise. {END}
+** This routine returns [SQLITE_OK] if shared cache was enabled or disabled
+** successfully.  An [error code] is returned otherwise.
 **
-** {F10339} Shared cache is disabled by default. {END} But this might change in
+** Shared cache is disabled by default. But this might change in
 ** future releases of SQLite.  Applications that care about shared
 ** cache setting should set it explicitly.
+**
+** INVARIANTS:
+**
+** {H10331} A successful invocation of [sqlite3_enable_shared_cache(B)]
+**          will enable or disable shared cache mode for any subsequently
+**          created [database connection] in the same process.
+**
+** {H10336} When shared cache is enabled, the [sqlite3_create_module()]
+**          interface will always return an error.
+**
+** {H10337} The [sqlite3_enable_shared_cache(B)] interface returns
+**          [SQLITE_OK] if shared cache was enabled or disabled successfully.
+**
+** {H10339} Shared cache is disabled by default.
 */
 int sqlite3_enable_shared_cache(int);
 
 /*
-** CAPI3REF:  Attempt To Free Heap Memory {F17340}
+** CAPI3REF: Attempt To Free Heap Memory {H17340} 
+**
+** The sqlite3_release_memory() interface attempts to free N bytes
+** of heap memory by deallocating non-essential memory allocations
+** held by the database library. {END}  Memory used to cache database
+** pages to improve performance is an example of non-essential memory.
+** sqlite3_release_memory() returns the number of bytes actually freed,
+** which might be more or less than the amount requested.
+**
+** INVARIANTS:
+**
+** {H17341} The [sqlite3_release_memory(N)] interface attempts to
+**          free N bytes of heap memory by deallocating non-essential
+**          memory allocations held by the database library.
 **
-** {F17341} The sqlite3_release_memory() interface attempts to
-** free N bytes of heap memory by deallocating non-essential memory
-** allocations held by the database labrary. {END}  Memory used
-** to cache database pages to improve performance is an example of
-** non-essential memory.  {F16342} sqlite3_release_memory() returns
-** the number of bytes actually freed, which might be more or less
-** than the amount requested.
+** {H16342} The [sqlite3_release_memory(N)] returns the number
+**          of bytes actually freed, which might be more or less
+**          than the amount requested.
 */
 int sqlite3_release_memory(int);
 
 /*
-** CAPI3REF:  Impose A Limit On Heap Size {F17350}
+** CAPI3REF: Impose A Limit On Heap Size {H17350} 
 **
-** {F16351} The sqlite3_soft_heap_limit() interface
-** places a "soft" limit on the amount of heap memory that may be allocated
-** by SQLite. {F16352} If an internal allocation is requested 
-** that would exceed the soft heap limit, [sqlite3_release_memory()] is
-** invoked one or more times to free up some space before the allocation
-** is made. {END}
+** The sqlite3_soft_heap_limit() interface places a "soft" limit
+** on the amount of heap memory that may be allocated by SQLite.
+** If an internal allocation is requested that would exceed the
+** soft heap limit, [sqlite3_release_memory()] is invoked one or
+** more times to free up some space before the allocation is performed.
 **
-** {F16353} The limit is called "soft", because if
-** [sqlite3_release_memory()] cannot
-** free sufficient memory to prevent the limit from being exceeded,
+** The limit is called "soft", because if [sqlite3_release_memory()]
+** cannot free sufficient memory to prevent the limit from being exceeded,
 ** the memory is allocated anyway and the current operation proceeds.
 **
-** {F16354}
 ** A negative or zero value for N means that there is no soft heap limit and
 ** [sqlite3_release_memory()] will only be called when memory is exhausted.
-** {F16355} The default value for the soft heap limit is zero.
+** The default value for the soft heap limit is zero.
 **
-** SQLite makes a best effort to honor the soft heap limit.  
-** {F16356} But if the soft heap limit cannot honored, execution will
-** continue without error or notification. {END}  This is why the limit is 
+** SQLite makes a best effort to honor the soft heap limit.
+** But if the soft heap limit cannot be honored, execution will
+** continue without error or notification.  This is why the limit is
 ** called a "soft" limit.  It is advisory only.
 **
 ** Prior to SQLite version 3.5.0, this routine only constrained the memory
 ** allocated by a single thread - the same thread in which this routine
 ** runs.  Beginning with SQLite version 3.5.0, the soft heap limit is
-** applied to all threads. {F16357} The value specified for the soft heap limit
-** is an upper bound on the total memory allocation for all threads. {END}  In
+** applied to all threads. The value specified for the soft heap limit
+** is an upper bound on the total memory allocation for all threads. In
 ** version 3.5.0 there is no mechanism for limiting the heap usage for
 ** individual threads.
+**
+** INVARIANTS:
+**
+** {H16351} The [sqlite3_soft_heap_limit(N)] interface places a soft limit
+**          of N bytes on the amount of heap memory that may be allocated
+**          using [sqlite3_malloc()] or [sqlite3_realloc()] at any point
+**          in time.
+**
+** {H16352} If a call to [sqlite3_malloc()] or [sqlite3_realloc()] would
+**          cause the total amount of allocated memory to exceed the
+**          soft heap limit, then [sqlite3_release_memory()] is invoked
+**          in an attempt to reduce the memory usage prior to proceeding
+**          with the memory allocation attempt.
+**
+** {H16353} Calls to [sqlite3_malloc()] or [sqlite3_realloc()] that trigger
+**          attempts to reduce memory usage through the soft heap limit
+**          mechanism continue even if the attempt to reduce memory
+**          usage is unsuccessful.
+**
+** {H16354} A negative or zero value for N in a call to
+**          [sqlite3_soft_heap_limit(N)] means that there is no soft
+**          heap limit and [sqlite3_release_memory()] will only be
+**          called when memory is completely exhausted.
+**
+** {H16355} The default value for the soft heap limit is zero.
+**
+** {H16358} Each call to [sqlite3_soft_heap_limit(N)] overrides the
+**          values set by all prior calls.
 */
 void sqlite3_soft_heap_limit(int);
 
 /*
-** CAPI3REF:  Extract Metadata About A Column Of A Table {F12850}
+** CAPI3REF: Extract Metadata About A Column Of A Table {H12850} 
 **
-** This routine
-** returns meta-data about a specific column of a specific database
-** table accessible using the connection handle passed as the first function 
-** argument.
+** This routine returns metadata about a specific column of a specific
+** database table accessible using the [database connection] handle
+** passed as the first function argument.
 **
-** The column is identified by the second, third and fourth parameters to 
+** The column is identified by the second, third and fourth parameters to
 ** this function. The second parameter is either the name of the database
 ** (i.e. "main", "temp" or an attached database) containing the specified
 ** table or NULL. If it is NULL, then all attached databases are searched
-** for the table using the same algorithm as the database engine uses to 
+** for the table using the same algorithm used by the database engine to
 ** resolve unqualified table references.
 **
-** The third and fourth parameters to this function are the table and column 
-** name of the desired column, respectively. Neither of these parameters 
+** The third and fourth parameters to this function are the table and column
+** name of the desired column, respectively. Neither of these parameters
 ** may be NULL.
 **
-** Meta information is returned by writing to the memory locations passed as
-** the 5th and subsequent parameters to this function. Any of these 
-** arguments may be NULL, in which case the corresponding element of meta 
-** information is ommitted.
+** Metadata is returned by writing to the memory locations passed as the 5th
+** and subsequent parameters to this function. Any of these arguments may be
+** NULL, in which case the corresponding element of metadata is omitted.
 **
-** 
      -** Parameter     Output Type      Description
-** -----------------------------------
-**
-**   5th         const char*      Data type
-**   6th         const char*      Name of the default collation sequence 
-**   7th         int              True if the column has a NOT NULL constraint
-**   8th         int              True if the column is part of the PRIMARY KEY
-**   9th         int              True if the column is AUTOINCREMENT
-** 
      
+** 
      
+** 
+** 
       Parameter  Output
      Type       		  Description
 **
+** 
       5th  const char*  Data type
+** 
       6th  const char*  Name of default collation sequence
+** 
       7th  int          True if column has a NOT NULL constraint
+** 
       8th  int          True if column is part of the PRIMARY KEY
+** 
       9th  int          True if column is AUTOINCREMENT
+** 
      
+** 
      
 **
-** The memory pointed to by the character pointers returned for the 
-** declaration type and collation sequence is valid only until the next 
-** call to any sqlite API function.
+** The memory pointed to by the character pointers returned for the
+** declaration type and collation sequence is valid only until the next
+** call to any SQLite API function.
 **
-** If the specified table is actually a view, then an error is returned.
+** If the specified table is actually a view, an [error code] is returned.
 **
-** If the specified column is "rowid", "oid" or "_rowid_" and an 
-** INTEGER PRIMARY KEY column has been explicitly declared, then the output 
+** If the specified column is "rowid", "oid" or "_rowid_" and an
+** INTEGER PRIMARY KEY column has been explicitly declared, then the output
 ** parameters are set for the explicitly declared column. If there is no
-** explicitly declared IPK column, then the output parameters are set as 
-** follows:
+** explicitly declared INTEGER PRIMARY KEY column, then the output
+** parameters are set as follows:
 **
 ** 
       **     data type: "INTEGER"
@@ -3143,11 +5110,11 @@ void sqlite3_soft_heap_limit(int);
 **
 ** This function may load one or more schemas from database files. If an
 ** error occurs during this process, or if the requested table or column
-** cannot be found, an SQLITE error code is returned and an error message
-** left in the database handle (to be retrieved using sqlite3_errmsg()).
+** cannot be found, an [error code] is returned and an error message left
+** in the [database connection] (to be retrieved using sqlite3_errmsg()).
 **
 ** This API is only available if the library was compiled with the
-** SQLITE_ENABLE_COLUMN_METADATA preprocessor symbol defined.
+** [SQLITE_ENABLE_COLUMN_METADATA] C-preprocessor symbol defined.
 */
 int sqlite3_table_column_metadata(
   sqlite3 *db,                /* Connection handle */
@@ -3162,27 +5129,30 @@ int sqlite3_table_column_metadata(
 );
 
 /*
-** CAPI3REF: Load An Extension {F12600}
+** CAPI3REF: Load An Extension {H12600} 
+**
+** This interface loads an SQLite extension library from the named file.
+**
+** {H12601} The sqlite3_load_extension() interface attempts to load an
+**          SQLite extension library contained in the file zFile.
+**
+** {H12602} The entry point is zProc.
 **
-** {F12601} The sqlite3_load_extension() interface
-** attempts to load an SQLite extension library contained in the file
-** zFile. {F12602} The entry point is zProc. {F12603} zProc may be 0
-** in which case the name of the entry point defaults
-** to "sqlite3_extension_init".
+** {H12603} zProc may be 0, in which case the name of the entry point
+**          defaults to "sqlite3_extension_init".
 **
-** {F12604} The sqlite3_load_extension() interface shall
-** return [SQLITE_OK] on success and [SQLITE_ERROR] if something goes wrong.
+** {H12604} The sqlite3_load_extension() interface shall return
+**          [SQLITE_OK] on success and [SQLITE_ERROR] if something goes wrong.
 **
-** {F12605}
-** If an error occurs and pzErrMsg is not 0, then the
-** sqlite3_load_extension() interface shall attempt to fill *pzErrMsg with 
-** error message text stored in memory obtained from [sqlite3_malloc()].
-** {END}  The calling function should free this memory
-** by calling [sqlite3_free()].
+** {H12605} If an error occurs and pzErrMsg is not 0, then the
+**          [sqlite3_load_extension()] interface shall attempt to
+**          fill *pzErrMsg with error message text stored in memory
+**          obtained from [sqlite3_malloc()]. {END}  The calling function
+**          should free this memory by calling [sqlite3_free()].
 **
-** {F12606}
-** Extension loading must be enabled using [sqlite3_enable_load_extension()]
-** prior to calling this API or an error will be returned.
+** {H12606} Extension loading must be enabled using
+**          [sqlite3_enable_load_extension()] prior to calling this API,
+**          otherwise an error will be returned.
 */
 int sqlite3_load_extension(
   sqlite3 *db,          /* Load the extension into this database connection */
@@ -3192,65 +5162,64 @@ int sqlite3_load_extension(
 );
 
 /*
-** CAPI3REF:  Enable Or Disable Extension Loading {F12620}
+** CAPI3REF: Enable Or Disable Extension Loading {H12620} 
 **
 ** So as not to open security holes in older applications that are
 ** unprepared to deal with extension loading, and as a means of disabling
-** extension loading while evaluating user-entered SQL, the following
-** API is provided to turn the [sqlite3_load_extension()] mechanism on and
-** off.  {F12622} It is off by default. {END} See ticket #1863.
+** extension loading while evaluating user-entered SQL, the following API
+** is provided to turn the [sqlite3_load_extension()] mechanism on and off.
 **
-** {F12621} Call the sqlite3_enable_load_extension() routine
-** with onoff==1 to turn extension loading on
-** and call it with onoff==0 to turn it back off again. {END}
+** Extension loading is off by default. See ticket #1863.
+**
+** {H12621} Call the sqlite3_enable_load_extension() routine with onoff==1
+**          to turn extension loading on and call it with onoff==0 to turn
+**          it back off again.
+**
+** {H12622} Extension loading is off by default.
 */
 int sqlite3_enable_load_extension(sqlite3 *db, int onoff);
 
 /*
-** CAPI3REF: Make Arrangements To Automatically Load An Extension {F12640}
-**
-** {F12641} This function
-** registers an extension entry point that is automatically invoked
-** whenever a new database connection is opened using
-** [sqlite3_open()], [sqlite3_open16()], or [sqlite3_open_v2()]. {END}
+** CAPI3REF: Automatically Load An Extensions {H12640} 
 **
 ** This API can be invoked at program startup in order to register
 ** one or more statically linked extensions that will be available
-** to all new database connections.
+** to all new [database connections]. {END}
 **
-** {F12642} Duplicate extensions are detected so calling this routine multiple
-** times with the same extension is harmless.
+** This routine stores a pointer to the extension in an array that is
+** obtained from [sqlite3_malloc()].  If you run a memory leak checker
+** on your program and it reports a leak because of this array, invoke
+** [sqlite3_reset_auto_extension()] prior to shutdown to free the memory.
 **
-** {F12643} This routine stores a pointer to the extension in an array
-** that is obtained from sqlite_malloc(). {END} If you run a memory leak
-** checker on your program and it reports a leak because of this
-** array, then invoke [sqlite3_reset_auto_extension()] prior
-** to shutdown to free the memory.
+** {H12641} This function registers an extension entry point that is
+**          automatically invoked whenever a new [database connection]
+**          is opened using [sqlite3_open()], [sqlite3_open16()],
+**          or [sqlite3_open_v2()].
 **
-** {F12644} Automatic extensions apply across all threads. {END}
+** {H12642} Duplicate extensions are detected so calling this routine
+**          multiple times with the same extension is harmless.
 **
-** This interface is experimental and is subject to change or
-** removal in future releases of SQLite.
+** {H12643} This routine stores a pointer to the extension in an array
+**          that is obtained from [sqlite3_malloc()].
+**
+** {H12644} Automatic extensions apply across all threads.
 */
 int sqlite3_auto_extension(void *xEntryPoint);
 
-
 /*
-** CAPI3REF: Reset Automatic Extension Loading {F12660}
+** CAPI3REF: Reset Automatic Extension Loading {H12660} 
 **
-** {F12661} This function disables all previously registered
-** automatic extensions. {END}  This
-** routine undoes the effect of all prior [sqlite3_automatic_extension()]
-** calls.
+** This function disables all previously registered automatic
+** extensions. {END}  It undoes the effect of all prior
+** [sqlite3_auto_extension()] calls.
 **
-** {F12662} This call disabled automatic extensions in all threads. {END}
+** {H12661} This function disables all previously registered
+**          automatic extensions.
 **
-** This interface is experimental and is subject to change or
-** removal in future releases of SQLite.
+** {H12662} This function disables automatic extensions in all threads.
 */
 void sqlite3_reset_auto_extension(void);
 
-
 /*
 ****** EXPERIMENTAL - subject to change without notice **************
 **
@@ -3258,7 +5227,7 @@ void sqlite3_reset_auto_extension(void);
 ** to be experimental.  The interface might change in incompatible ways.
 ** If this is a problem for you, do not use the interface at this time.
 **
-** When the virtual-table mechanism stablizes, we will declare the
+** When the virtual-table mechanism stabilizes, we will declare the
 ** interface fixed, support it indefinitely, and remove this comment.
 */
 
@@ -3271,9 +5240,16 @@ typedef struct sqlite3_vtab_cursor sqlite3_vtab_cursor;
 typedef struct sqlite3_module sqlite3_module;
 
 /*
+** CAPI3REF: Virtual Table Object {H18000} 
+** KEYWORDS: sqlite3_module
+** EXPERIMENTAL
+**
 ** A module is a class of virtual tables.  Each module is defined
 ** by an instance of the following structure.  This structure consists
 ** mostly of methods for the module.
+**
+** This interface is experimental and is subject to change or
+** removal in future releases of SQLite.
 */
 struct sqlite3_module {
   int iVersion;
@@ -3302,25 +5278,26 @@ struct sqlite3_module {
   int (*xFindFunction)(sqlite3_vtab *pVtab, int nArg, const char *zName,
                        void (**pxFunc)(sqlite3_context*,int,sqlite3_value**),
                        void **ppArg);
-
   int (*xRename)(sqlite3_vtab *pVtab, const char *zNew);
 };
 
 /*
+** CAPI3REF: Virtual Table Indexing Information {H18100} 
+** KEYWORDS: sqlite3_index_info
+** EXPERIMENTAL
+**
 ** The sqlite3_index_info structure and its substructures is used to
 ** pass information into and receive the reply from the xBestIndex
 ** method of an sqlite3_module.  The fields under **Inputs** are the
 ** inputs to xBestIndex and are read-only.  xBestIndex inserts its
 ** results into the **Outputs** fields.
 **
-** The aConstraint[] array records WHERE clause constraints of the
-** form:
+** The aConstraint[] array records WHERE clause constraints of the form:
 **
-**         column OP expr
+** 
      column OP expr
      
 **
-** Where OP is =, <, <=, >, or >=.  
-** The particular operator is stored
-** in aConstraint[].op.  The index of the column is stored in 
+** where OP is =, <, <=, >, or >=.  The particular operator is
+** stored in aConstraint[].op.  The index of the column is stored in
 ** aConstraint[].iColumn.  aConstraint[].usable is TRUE if the
 ** expr on the right-hand side can be evaluated (and thus the constraint
 ** is usable) and false if it cannot.
@@ -3352,6 +5329,9 @@ struct sqlite3_module {
 ** particular lookup.  A full scan of a table with N entries should have
 ** a cost of N.  A binary search of a table of N entries should have a
 ** cost of approximately log(N).
+**
+** This interface is experimental and is subject to change or
+** removal in future releases of SQLite.
 */
 struct sqlite3_index_info {
   /* Inputs */
@@ -3367,7 +5347,6 @@ struct sqlite3_index_info {
      int iColumn;              /* Column number */
      unsigned char desc;       /* True for DESC.  False for ASC. */
   } *aOrderBy;               /* The ORDER BY clause */
-
   /* Outputs */
   struct sqlite3_index_constraint_usage {
     int argvIndex;           /* if >0, constraint is part of argv to xFilter */
@@ -3387,10 +5366,16 @@ struct sqlite3_index_info {
 #define SQLITE_INDEX_CONSTRAINT_MATCH 64
 
 /*
-** This routine is used to register a new module name with an SQLite
-** connection.  Module names must be registered before creating new
-** virtual tables on the module, or before using preexisting virtual
-** tables of the module.
+** CAPI3REF: Register A Virtual Table Implementation {H18200} 
+** EXPERIMENTAL
+**
+** This routine is used to register a new module name with a
+** [database connection].  Module names must be registered before
+** creating new virtual tables on the module, or before using
+** preexisting virtual tables of the module.
+**
+** This interface is experimental and is subject to change or
+** removal in future releases of SQLite.
 */
 int sqlite3_create_module(
   sqlite3 *db,               /* SQLite connection to register module with */
@@ -3400,7 +5385,10 @@ int sqlite3_create_module(
 );
 
 /*
-** This routine is identical to the sqlite3_create_module() method above,
+** CAPI3REF: Register A Virtual Table Implementation {H18210} 
+** EXPERIMENTAL
+**
+** This routine is identical to the [sqlite3_create_module()] method above,
 ** except that it allows a destructor function to be specified. It is
 ** even more experimental than the rest of the virtual tables API.
 */
@@ -3413,21 +5401,28 @@ int sqlite3_create_module_v2(
 );
 
 /*
+** CAPI3REF: Virtual Table Instance Object {H18010} 
+** KEYWORDS: sqlite3_vtab
+** EXPERIMENTAL
+**
 ** Every module implementation uses a subclass of the following structure
 ** to describe a particular instance of the module.  Each subclass will
-** be tailored to the specific needs of the module implementation.   The
-** purpose of this superclass is to define certain fields that are common
-** to all module implementations.
+** be tailored to the specific needs of the module implementation.
+** The purpose of this superclass is to define certain fields that are
+** common to all module implementations.
 **
 ** Virtual tables methods can set an error message by assigning a
-** string obtained from sqlite3_mprintf() to zErrMsg.  The method should
-** take care that any prior string is freed by a call to sqlite3_free()
+** string obtained from [sqlite3_mprintf()] to zErrMsg.  The method should
+** take care that any prior string is freed by a call to [sqlite3_free()]
 ** prior to assigning a new string to zErrMsg.  After the error message
 ** is delivered up to the client application, the string will be automatically
 ** freed by sqlite3_free() and the zErrMsg field will be zeroed.  Note
 ** that sqlite3_mprintf() and sqlite3_free() are used on the zErrMsg field
 ** since virtual tables are commonly implemented in loadable extensions which
 ** do not have access to sqlite3MPrintf() or sqlite3Free().
+**
+** This interface is experimental and is subject to change or
+** removal in future releases of SQLite.
 */
 struct sqlite3_vtab {
   const sqlite3_module *pModule;  /* The module for this virtual table */
@@ -3436,7 +5431,12 @@ struct sqlite3_vtab {
   /* Virtual table implementations will typically add additional fields */
 };
 
-/* Every module implementation uses a subclass of the following structure
+/*
+** CAPI3REF: Virtual Table Cursor Object  {H18020} 
+** KEYWORDS: sqlite3_vtab_cursor
+** EXPERIMENTAL
+**
+** Every module implementation uses a subclass of the following structure
 ** to describe cursors that point into the virtual table and are used
 ** to loop through the virtual table.  Cursors are created using the
 ** xOpen method of the module.  Each module implementation will define
@@ -3444,6 +5444,9 @@ struct sqlite3_vtab {
 **
 ** This superclass exists in order to define fields of the cursor that
 ** are common to all implementations.
+**
+** This interface is experimental and is subject to change or
+** removal in future releases of SQLite.
 */
 struct sqlite3_vtab_cursor {
   sqlite3_vtab *pVtab;      /* Virtual table of this cursor */
@@ -3451,13 +5454,22 @@ struct sqlite3_vtab_cursor {
 };
 
 /*
+** CAPI3REF: Declare The Schema Of A Virtual Table {H18280} 
+** EXPERIMENTAL
+**
 ** The xCreate and xConnect methods of a module use the following API
 ** to declare the format (the names and datatypes of the columns) of
 ** the virtual tables they implement.
+**
+** This interface is experimental and is subject to change or
+** removal in future releases of SQLite.
 */
 int sqlite3_declare_vtab(sqlite3*, const char *zCreateTable);
 
 /*
+** CAPI3REF: Overload A Function For A Virtual Table {H18300} 
+** EXPERIMENTAL
+**
 ** Virtual tables can provide alternative implementations of functions
 ** using the xFindFunction method.  But global versions of those functions
 ** must exist in order to be overloaded.
@@ -3467,7 +5479,7 @@ int sqlite3_declare_vtab(sqlite3*, const char *zCreateTable);
 ** before this API is called, a new function is created.  The implementation
 ** of the new function always causes an exception to be thrown.  So
 ** the new function is not good for anything by itself.  Its only
-** purpose is to be a place-holder function that can be overloaded
+** purpose is to be a placeholder function that can be overloaded
 ** by virtual tables.
 **
 ** This API should be considered part of the virtual table interface,
@@ -3488,41 +5500,83 @@ int sqlite3_overload_function(sqlite3*, const char *zFuncName, int nArg);
 */
 
 /*
-** CAPI3REF: A Handle To An Open BLOB {F17800}
+** CAPI3REF: A Handle To An Open BLOB {H17800} 
+** KEYWORDS: {BLOB handle} {BLOB handles}
 **
-** An instance of the following opaque structure is used to 
-** represent an blob-handle.  A blob-handle is created by
-** [sqlite3_blob_open()] and destroyed by [sqlite3_blob_close()].
+** An instance of this object represents an open BLOB on which
+** [sqlite3_blob_open | incremental BLOB I/O] can be performed.
+** Objects of this type are created by [sqlite3_blob_open()]
+** and destroyed by [sqlite3_blob_close()].
 ** The [sqlite3_blob_read()] and [sqlite3_blob_write()] interfaces
-** can be used to read or write small subsections of the blob.
-** The [sqlite3_blob_bytes()] interface returns the size of the
-** blob in bytes.
+** can be used to read or write small subsections of the BLOB.
+** The [sqlite3_blob_bytes()] interface returns the size of the BLOB in bytes.
 */
 typedef struct sqlite3_blob sqlite3_blob;
 
 /*
-** CAPI3REF: Open A BLOB For Incremental I/O {F17810}
+** CAPI3REF: Open A BLOB For Incremental I/O {H17810} 
 **
-** {F17811} This interfaces opens a handle to the blob located
-** in row iRow,, column zColumn, table zTable in database zDb;
-** in other words,  the same blob that would be selected by:
+** This interfaces opens a [BLOB handle | handle] to the BLOB located
+** in row iRow, column zColumn, table zTable in database zDb;
+** in other words, the same BLOB that would be selected by:
 **
 ** 
       **     SELECT zColumn FROM zDb.zTable WHERE rowid = iRow;
 ** 
       {END}
 **
-** {F17812} If the flags parameter is non-zero, the blob is opened for 
-** read and write access. If it is zero, the blob is opened for read 
-** access. {END}
+** If the flags parameter is non-zero, the the BLOB is opened for read
+** and write access. If it is zero, the BLOB is opened for read access.
+**
+** Note that the database name is not the filename that contains
+** the database but rather the symbolic name of the database that
+** is assigned when the database is connected using [ATTACH].
+** For the main database file, the database name is "main".
+** For TEMP tables, the database name is "temp".
 **
-** {F17813} On success, [SQLITE_OK] is returned and the new 
-** [sqlite3_blob | blob handle] is written to *ppBlob. 
-** {F17814} Otherwise an error code is returned and 
-** any value written to *ppBlob should not be used by the caller.
-** {F17815} This function sets the database-handle error code and message
+** On success, [SQLITE_OK] is returned and the new [BLOB handle] is written
+** to *ppBlob. Otherwise an [error code] is returned and any value written
+** to *ppBlob should not be used by the caller.
+** This function sets the [database connection] error code and message
 ** accessible via [sqlite3_errcode()] and [sqlite3_errmsg()].
-** We should go through and mark all interfaces that behave this
-** way with a similar statement
+**
+** If the row that a BLOB handle points to is modified by an
+** [UPDATE], [DELETE], or by [ON CONFLICT] side-effects
+** then the BLOB handle is marked as "expired".
+** This is true if any column of the row is changed, even a column
+** other than the one the BLOB handle is open on.
+** Calls to [sqlite3_blob_read()] and [sqlite3_blob_write()] for
+** a expired BLOB handle fail with an return code of [SQLITE_ABORT].
+** Changes written into a BLOB prior to the BLOB expiring are not
+** rollback by the expiration of the BLOB.  Such changes will eventually
+** commit if the transaction continues to completion.
+**
+** INVARIANTS:
+**
+** {H17813} A successful invocation of the [sqlite3_blob_open(D,B,T,C,R,F,P)]
+**          interface shall open an [sqlite3_blob] object P on the BLOB
+**          in column C of the table T in the database B on
+**          the [database connection] D.
+**
+** {H17814} A successful invocation of [sqlite3_blob_open(D,...)] shall start
+**          a new transaction on the [database connection] D if that
+**          connection is not already in a transaction.
+**
+** {H17816} The [sqlite3_blob_open(D,B,T,C,R,F,P)] interface shall open
+**          the BLOB for read and write access if and only if the F
+**          parameter is non-zero.
+**
+** {H17819} The [sqlite3_blob_open()] interface shall return [SQLITE_OK] on
+**          success and an appropriate [error code] on failure.
+**
+** {H17821} If an error occurs during evaluation of [sqlite3_blob_open(D,...)]
+**          then subsequent calls to [sqlite3_errcode(D)],
+**          [sqlite3_errmsg(D)], and [sqlite3_errmsg16(D)] shall return
+**          information appropriate for that error.
+**
+** {H17824} If any column in the row that a [sqlite3_blob] has open is
+**          changed by a separate [UPDATE] or [DELETE] statement or by
+**          an [ON CONFLICT] side effect, then the [sqlite3_blob] shall
+**          be marked as invalid.
 */
 int sqlite3_blob_open(
   sqlite3*,
@@ -3535,118 +5589,242 @@ int sqlite3_blob_open(
 );
 
 /*
-** CAPI3REF:  Close A BLOB Handle {F17830}
+** CAPI3REF: Close A BLOB Handle {H17830} 
 **
-** Close an open [sqlite3_blob | blob handle].
+** Closes an open [BLOB handle].
 **
-** {F17831} Closing a BLOB shall cause the current transaction to commit
+** Closing a BLOB shall cause the current transaction to commit
 ** if there are no other BLOBs, no pending prepared statements, and the
-** database connection is in autocommit mode.
-** {F17832} If any writes were made to the BLOB, they might be held in cache
+** database connection is in [autocommit mode].
+** If any writes were made to the BLOB, they might be held in cache
 ** until the close operation if they will fit. {END}
+**
 ** Closing the BLOB often forces the changes
 ** out to disk and so if any I/O errors occur, they will likely occur
-** at the time when the BLOB is closed.  {F17833} Any errors that occur during
+** at the time when the BLOB is closed.  {H17833} Any errors that occur during
 ** closing are reported as a non-zero return value.
 **
-** {F17839} The BLOB is closed unconditionally.  Even if this routine returns
+** The BLOB is closed unconditionally.  Even if this routine returns
 ** an error code, the BLOB is still closed.
+**
+** INVARIANTS:
+**
+** {H17833} The [sqlite3_blob_close(P)] interface closes an [sqlite3_blob]
+**          object P previously opened using [sqlite3_blob_open()].
+**
+** {H17836} Closing an [sqlite3_blob] object using
+**          [sqlite3_blob_close()] shall cause the current transaction to
+**          commit if there are no other open [sqlite3_blob] objects
+**          or [prepared statements] on the same [database connection] and
+**          the database connection is in [autocommit mode].
+**
+** {H17839} The [sqlite3_blob_close(P)] interfaces shall close the
+**          [sqlite3_blob] object P unconditionally, even if
+**          [sqlite3_blob_close(P)] returns something other than [SQLITE_OK].
 */
 int sqlite3_blob_close(sqlite3_blob *);
 
 /*
-** CAPI3REF:  Return The Size Of An Open BLOB {F17805}
+** CAPI3REF: Return The Size Of An Open BLOB {H17840} 
 **
-** {F16806} Return the size in bytes of the blob accessible via the open 
-** [sqlite3_blob | blob-handle] passed as an argument.
+** Returns the size in bytes of the BLOB accessible via the open
+** []BLOB handle] in its only argument.
+**
+** INVARIANTS:
+**
+** {H17843} The [sqlite3_blob_bytes(P)] interface returns the size
+**          in bytes of the BLOB that the [sqlite3_blob] object P
+**          refers to.
 */
 int sqlite3_blob_bytes(sqlite3_blob *);
 
 /*
-** CAPI3REF:  Read Data From A BLOB Incrementally {F17850}
+** CAPI3REF: Read Data From A BLOB Incrementally {H17850} 
+**
+** This function is used to read data from an open [BLOB handle] into a
+** caller-supplied buffer. N bytes of data are copied into buffer Z
+** from the open BLOB, starting at offset iOffset.
+**
+** If offset iOffset is less than N bytes from the end of the BLOB,
+** [SQLITE_ERROR] is returned and no data is read.  If N or iOffset is
+** less than zero, [SQLITE_ERROR] is returned and no data is read.
 **
-** This function is used to read data from an open 
-** [sqlite3_blob | blob-handle] into a caller supplied buffer.
-** {F17851} n bytes of data are copied into buffer
-** z from the open blob, starting at offset iOffset.
+** An attempt to read from an expired [BLOB handle] fails with an
+** error code of [SQLITE_ABORT].
 **
-** {F17852} If offset iOffset is less than n bytes from the end of the blob, 
-** [SQLITE_ERROR] is returned and no data is read.  {F17853} If n is
-** less than zero [SQLITE_ERROR] is returned and no data is read.
+** On success, SQLITE_OK is returned.
+** Otherwise, an [error code] or an [extended error code] is returned.
 **
-** {F17854} On success, SQLITE_OK is returned. Otherwise, an 
-** [SQLITE_ERROR | SQLite error code] or an
-** [SQLITE_IOERR_READ | extended error code] is returned.
+** INVARIANTS:
+**
+** {H17853} A successful invocation of [sqlite3_blob_read(P,Z,N,X)] 
+**          shall reads N bytes of data out of the BLOB referenced by
+**          [BLOB handle] P beginning at offset X and store those bytes
+**          into buffer Z.
+**
+** {H17856} In [sqlite3_blob_read(P,Z,N,X)] if the size of the BLOB
+**          is less than N+X bytes, then the function shall leave the
+**          Z buffer unchanged and return [SQLITE_ERROR].
+**
+** {H17859} In [sqlite3_blob_read(P,Z,N,X)] if X or N is less than zero
+**          then the function shall leave the Z buffer unchanged
+**          and return [SQLITE_ERROR].
+**
+** {H17862} The [sqlite3_blob_read(P,Z,N,X)] interface shall return [SQLITE_OK]
+**          if N bytes are successfully read into buffer Z.
+**
+** {H17863} If the [BLOB handle] P is expired and X and N are within bounds
+**          then [sqlite3_blob_read(P,Z,N,X)] shall leave the Z buffer
+**          unchanged and return [SQLITE_ABORT].
+**
+** {H17865} If the requested read could not be completed,
+**          the [sqlite3_blob_read(P,Z,N,X)] interface shall return an
+**          appropriate [error code] or [extended error code].
+**
+** {H17868} If an error occurs during evaluation of [sqlite3_blob_read(P,...)]
+**          then subsequent calls to [sqlite3_errcode(D)],
+**          [sqlite3_errmsg(D)], and [sqlite3_errmsg16(D)] shall return
+**          information appropriate for that error, where D is the
+**          [database connection] that was used to open the [BLOB handle] P.
 */
-int sqlite3_blob_read(sqlite3_blob *, void *z, int n, int iOffset);
+int sqlite3_blob_read(sqlite3_blob *, void *Z, int N, int iOffset);
 
 /*
-** CAPI3REF:  Write Data Into A BLOB Incrementally {F17870}
+** CAPI3REF: Write Data Into A BLOB Incrementally {H17870} 
 **
-** This function is used to write data into an open 
-** [sqlite3_blob | blob-handle] from a user supplied buffer.
-** {F17871} n bytes of data are copied from the buffer
-** pointed to by z into the open blob, starting at offset iOffset.
+** This function is used to write data into an open [BLOB handle] from a
+** caller-supplied buffer. N bytes of data are copied from the buffer Z
+** into the open BLOB, starting at offset iOffset.
 **
-** {F17872} If the [sqlite3_blob | blob-handle] passed as the first argument
-** was not opened for writing (the flags parameter to [sqlite3_blob_open()]
-*** was zero), this function returns [SQLITE_READONLY].
+** If the [BLOB handle] passed as the first argument was not opened for
+** writing (the flags parameter to [sqlite3_blob_open()] was zero),
+** this function returns [SQLITE_READONLY].
 **
-** {F17873} This function may only modify the contents of the blob; it is
-** not possible to increase the size of a blob using this API.
-** {F17874} If offset iOffset is less than n bytes from the end of the blob, 
-** [SQLITE_ERROR] is returned and no data is written.  {F17875} If n is
+** This function may only modify the contents of the BLOB; it is
+** not possible to increase the size of a BLOB using this API.
+** If offset iOffset is less than N bytes from the end of the BLOB,
+** [SQLITE_ERROR] is returned and no data is written.  If N is
 ** less than zero [SQLITE_ERROR] is returned and no data is written.
 **
-** {F17876} On success, SQLITE_OK is returned. Otherwise, an 
-** [SQLITE_ERROR | SQLite error code] or an
-** [SQLITE_IOERR_READ | extended error code] is returned.
+** An attempt to write to an expired [BLOB handle] fails with an
+** error code of [SQLITE_ABORT].  Writes to the BLOB that occurred
+** before the [BLOB handle] expired are not rolled back by the
+** expiration of the handle, though of course those changes might
+** have been overwritten by the statement that expired the BLOB handle
+** or by other independent statements.
+**
+** On success, SQLITE_OK is returned.
+** Otherwise, an  [error code] or an [extended error code] is returned.
+**
+** INVARIANTS:
+**
+** {H17873} A successful invocation of [sqlite3_blob_write(P,Z,N,X)]
+**          shall write N bytes of data from buffer Z into the BLOB 
+**          referenced by [BLOB handle] P beginning at offset X into
+**          the BLOB.
+**
+** {H17874} In the absence of other overridding changes, the changes
+**          written to a BLOB by [sqlite3_blob_write()] shall
+**          remain in effect after the associated [BLOB handle] expires.
+**
+** {H17875} If the [BLOB handle] P was opened for reading only then
+**          an invocation of [sqlite3_blob_write(P,Z,N,X)] shall leave
+**          the referenced BLOB unchanged and return [SQLITE_READONLY].
+**
+** {H17876} If the size of the BLOB referenced by [BLOB handle] P is
+**          less than N+X bytes then [sqlite3_blob_write(P,Z,N,X)] shall
+**          leave the BLOB unchanged and return [SQLITE_ERROR].
+**
+** {H17877} If the [BLOB handle] P is expired and X and N are within bounds
+**          then [sqlite3_blob_read(P,Z,N,X)] shall leave the BLOB
+**          unchanged and return [SQLITE_ABORT].
+**
+** {H17879} If X or N are less than zero then [sqlite3_blob_write(P,Z,N,X)]
+**          shall leave the BLOB referenced by [BLOB handle] P unchanged
+**          and return [SQLITE_ERROR].
+**
+** {H17882} The [sqlite3_blob_write(P,Z,N,X)] interface shall return
+**          [SQLITE_OK] if N bytes where successfully written into the BLOB.
+**
+** {H17885} If the requested write could not be completed,
+**          the [sqlite3_blob_write(P,Z,N,X)] interface shall return an
+**          appropriate [error code] or [extended error code].
+**
+** {H17888} If an error occurs during evaluation of [sqlite3_blob_write(D,...)]
+**          then subsequent calls to [sqlite3_errcode(D)],
+**          [sqlite3_errmsg(D)], and [sqlite3_errmsg16(D)] shall return
+**          information appropriate for that error.
 */
 int sqlite3_blob_write(sqlite3_blob *, const void *z, int n, int iOffset);
 
 /*
-** CAPI3REF:  Virtual File System Objects {F11200}
+** CAPI3REF: Virtual File System Objects {H11200} 
 **
 ** A virtual filesystem (VFS) is an [sqlite3_vfs] object
 ** that SQLite uses to interact
-** with the underlying operating system.  Most builds come with a
+** with the underlying operating system.  Most SQLite builds come with a
 ** single default VFS that is appropriate for the host computer.
 ** New VFSes can be registered and existing VFSes can be unregistered.
 ** The following interfaces are provided.
 **
-** {F11201} The sqlite3_vfs_find() interface returns a pointer to 
-** a VFS given its name.  {F11202} Names are case sensitive.
-** {F11203} Names are zero-terminated UTF-8 strings.
-** {F11204} If there is no match, a NULL
-** pointer is returned. {F11205} If zVfsName is NULL then the default 
-** VFS is returned. {END}
-**
-** {F11210} New VFSes are registered with sqlite3_vfs_register().
-** {F11211} Each new VFS becomes the default VFS if the makeDflt flag is set.
-** {F11212} The same VFS can be registered multiple times without injury.
-** {F11213} To make an existing VFS into the default VFS, register it again
-** with the makeDflt flag set. {U11214} If two different VFSes with the
-** same name are registered, the behavior is undefined.  {U11215} If a
+** The sqlite3_vfs_find() interface returns a pointer to a VFS given its name.
+** Names are case sensitive.
+** Names are zero-terminated UTF-8 strings.
+** If there is no match, a NULL pointer is returned.
+** If zVfsName is NULL then the default VFS is returned.
+**
+** New VFSes are registered with sqlite3_vfs_register().
+** Each new VFS becomes the default VFS if the makeDflt flag is set.
+** The same VFS can be registered multiple times without injury.
+** To make an existing VFS into the default VFS, register it again
+** with the makeDflt flag set.  If two different VFSes with the
+** same name are registered, the behavior is undefined.  If a
 ** VFS is registered with a name that is NULL or an empty string,
 ** then the behavior is undefined.
-** 
-** {F11220} Unregister a VFS with the sqlite3_vfs_unregister() interface.
-** {F11221} If the default VFS is unregistered, another VFS is chosen as
+**
+** Unregister a VFS with the sqlite3_vfs_unregister() interface.
+** If the default VFS is unregistered, another VFS is chosen as
 ** the default.  The choice for the new VFS is arbitrary.
+**
+** INVARIANTS:
+**
+** {H11203} The [sqlite3_vfs_find(N)] interface returns a pointer to the
+**          registered [sqlite3_vfs] object whose name exactly matches
+**          the zero-terminated UTF-8 string N, or it returns NULL if
+**          there is no match.
+**
+** {H11206} If the N parameter to [sqlite3_vfs_find(N)] is NULL then
+**          the function returns a pointer to the default [sqlite3_vfs]
+**          object if there is one, or NULL if there is no default
+**          [sqlite3_vfs] object.
+**
+** {H11209} The [sqlite3_vfs_register(P,F)] interface registers the
+**          well-formed [sqlite3_vfs] object P using the name given
+**          by the zName field of the object.
+**
+** {H11212} Using the [sqlite3_vfs_register(P,F)] interface to register
+**          the same [sqlite3_vfs] object multiple times is a harmless no-op.
+**
+** {H11215} The [sqlite3_vfs_register(P,F)] interface makes the [sqlite3_vfs]
+**          object P the default [sqlite3_vfs] object if F is non-zero.
+**
+** {H11218} The [sqlite3_vfs_unregister(P)] interface unregisters the
+**          [sqlite3_vfs] object P so that it is no longer returned by
+**          subsequent calls to [sqlite3_vfs_find()].
 */
 sqlite3_vfs *sqlite3_vfs_find(const char *zVfsName);
 int sqlite3_vfs_register(sqlite3_vfs*, int makeDflt);
 int sqlite3_vfs_unregister(sqlite3_vfs*);
 
 /*
-** CAPI3REF: Mutexes {F17000}
+** CAPI3REF: Mutexes {H17000} 
 **
 ** The SQLite core uses these routines for thread
-** synchronization.  Though they are intended for internal
+** synchronization. Though they are intended for internal
 ** use by SQLite, code that links against SQLite is
 ** permitted to use any of these routines.
 **
-** The SQLite source code contains multiple implementations 
+** The SQLite source code contains multiple implementations
 ** of these mutex routines.  An appropriate implementation
 ** is selected automatically at compile-time.  The following
 ** implementations are available in the SQLite core:
@@ -3658,25 +5836,24 @@ int sqlite3_vfs_unregister(sqlite3_vfs*);
 ** 
    •    SQLITE_MUTEX_NOOP
 ** 
 **
-** The SQLITE_MUTEX_NOOP implementation is a set of routines 
-** that does no real locking and is appropriate for use in 
+** The SQLITE_MUTEX_NOOP implementation is a set of routines
+** that does no real locking and is appropriate for use in
 ** a single-threaded application.  The SQLITE_MUTEX_OS2,
 ** SQLITE_MUTEX_PTHREAD, and SQLITE_MUTEX_W32 implementations
-** are appropriate for use on os/2, unix, and windows.
-** 
+** are appropriate for use on OS/2, Unix, and Windows.
+**
 ** If SQLite is compiled with the SQLITE_MUTEX_APPDEF preprocessor
 ** macro defined (with "-DSQLITE_MUTEX_APPDEF=1"), then no mutex
-** implementation is included with the library.  The
-** mutex interface routines defined here become external
-** references in the SQLite library for which implementations
-** must be provided by the application.  This facility allows an
-** application that links against SQLite to provide its own mutex
-** implementation without having to modify the SQLite core.
-**
-** {F17011} The sqlite3_mutex_alloc() routine allocates a new
-** mutex and returns a pointer to it. {F17012} If it returns NULL
-** that means that a mutex could not be allocated. {F17013} SQLite
-** will unwind its stack and return an error. {F17014} The argument
+** implementation is included with the library. In this case the
+** application must supply a custom mutex implementation using the
+** [SQLITE_CONFIG_MUTEX] option of the sqlite3_config() function
+** before calling sqlite3_initialize() or any other public sqlite3_
+** function that calls sqlite3_initialize().
+**
+** {H17011} The sqlite3_mutex_alloc() routine allocates a new
+** mutex and returns a pointer to it. {H17012} If it returns NULL
+** that means that a mutex could not be allocated. {H17013} SQLite
+** will unwind its stack and return an error. {H17014} The argument
 ** to sqlite3_mutex_alloc() is one of these integer constants:
 **
 ** 
        
@@ -3687,19 +5864,20 @@ int sqlite3_vfs_unregister(sqlite3_vfs*);
 ** 
      •   SQLITE_MUTEX_STATIC_MEM2
 ** 
      •   SQLITE_MUTEX_STATIC_PRNG
 ** 
      •   SQLITE_MUTEX_STATIC_LRU
-** 
       {END}
+** 
    •   SQLITE_MUTEX_STATIC_LRU2
+** 
 **
-** {F17015} The first two constants cause sqlite3_mutex_alloc() to create
+** {H17015} The first two constants cause sqlite3_mutex_alloc() to create
 ** a new mutex.  The new mutex is recursive when SQLITE_MUTEX_RECURSIVE
 ** is used but not necessarily so when SQLITE_MUTEX_FAST is used. {END}
 ** The mutex implementation does not need to make a distinction
 ** between SQLITE_MUTEX_RECURSIVE and SQLITE_MUTEX_FAST if it does
-** not want to.  {F17016} But SQLite will only request a recursive mutex in
+** not want to.  {H17016} But SQLite will only request a recursive mutex in
 ** cases where it really needs one.  {END} If a faster non-recursive mutex
 ** implementation is available on the host platform, the mutex subsystem
 ** might return such a mutex in response to SQLITE_MUTEX_FAST.
 **
-** {F17017} The other allowed parameters to sqlite3_mutex_alloc() each return
+** {H17017} The other allowed parameters to sqlite3_mutex_alloc() each return
 ** a pointer to a static preexisting mutex. {END}  Four static mutexes are
 ** used by the current version of SQLite.  Future versions of SQLite
 ** may add additional static mutexes.  Static mutexes are for internal
@@ -3707,43 +5885,47 @@ int sqlite3_vfs_unregister(sqlite3_vfs*);
 ** use only the dynamic mutexes returned by SQLITE_MUTEX_FAST or
 ** SQLITE_MUTEX_RECURSIVE.
 **
-** {F17018} Note that if one of the dynamic mutex parameters (SQLITE_MUTEX_FAST
+** {H17018} Note that if one of the dynamic mutex parameters (SQLITE_MUTEX_FAST
 ** or SQLITE_MUTEX_RECURSIVE) is used then sqlite3_mutex_alloc()
-** returns a different mutex on every call.  {F17034} But for the static 
+** returns a different mutex on every call.  {H17034} But for the static
 ** mutex types, the same mutex is returned on every call that has
-** the same type number. {END}
+** the same type number.
 **
-** {F17019} The sqlite3_mutex_free() routine deallocates a previously
-** allocated dynamic mutex. {F17020} SQLite is careful to deallocate every
-** dynamic mutex that it allocates. {U17021} The dynamic mutexes must not be in 
-** use when they are deallocated. {U17022} Attempting to deallocate a static
-** mutex results in undefined behavior. {F17023} SQLite never deallocates
+** {H17019} The sqlite3_mutex_free() routine deallocates a previously
+** allocated dynamic mutex. {H17020} SQLite is careful to deallocate every
+** dynamic mutex that it allocates. {A17021} The dynamic mutexes must not be in
+** use when they are deallocated. {A17022} Attempting to deallocate a static
+** mutex results in undefined behavior. {H17023} SQLite never deallocates
 ** a static mutex. {END}
 **
 ** The sqlite3_mutex_enter() and sqlite3_mutex_try() routines attempt
-** to enter a mutex. {F17024} If another thread is already within the mutex,
+** to enter a mutex. {H17024} If another thread is already within the mutex,
 ** sqlite3_mutex_enter() will block and sqlite3_mutex_try() will return
-** SQLITE_BUSY. {F17025}  The sqlite3_mutex_try() interface returns SQLITE_OK
-** upon successful entry.  {F17026} Mutexes created using
+** SQLITE_BUSY. {H17025}  The sqlite3_mutex_try() interface returns [SQLITE_OK]
+** upon successful entry.  {H17026} Mutexes created using
 ** SQLITE_MUTEX_RECURSIVE can be entered multiple times by the same thread.
-** {F17027} In such cases the,
+** {H17027} In such cases the,
 ** mutex must be exited an equal number of times before another thread
-** can enter.  {U17028} If the same thread tries to enter any other
+** can enter.  {A17028} If the same thread tries to enter any other
 ** kind of mutex more than once, the behavior is undefined.
-** {F17029} SQLite will never exhibit
-** such behavior in its own use of mutexes. {END}
+** {H17029} SQLite will never exhibit
+** such behavior in its own use of mutexes.
 **
-** Some systems (ex: windows95) do not the operation implemented by
-** sqlite3_mutex_try().  On those systems, sqlite3_mutex_try() will
-** always return SQLITE_BUSY.  {F17030} The SQLite core only ever uses
-** sqlite3_mutex_try() as an optimization so this is acceptable behavior. {END}
+** Some systems (for example, Windows 95) do not support the operation
+** implemented by sqlite3_mutex_try().  On those systems, sqlite3_mutex_try()
+** will always return SQLITE_BUSY.  {H17030} The SQLite core only ever uses
+** sqlite3_mutex_try() as an optimization so this is acceptable behavior.
 **
-** {F17031} The sqlite3_mutex_leave() routine exits a mutex that was
-** previously entered by the same thread.  {U17032} The behavior
+** {H17031} The sqlite3_mutex_leave() routine exits a mutex that was
+** previously entered by the same thread.  {A17032} The behavior
 ** is undefined if the mutex is not currently entered by the
-** calling thread or is not currently allocated.  {F17033} SQLite will
+** calling thread or is not currently allocated.  {H17033} SQLite will
 ** never do either. {END}
 **
+** If the argument to sqlite3_mutex_enter(), sqlite3_mutex_try(), or
+** sqlite3_mutex_leave() is a NULL pointer, then all three routines
+** behave as no-ops.
+**
 ** See also: [sqlite3_mutex_held()] and [sqlite3_mutex_notheld()].
 */
 sqlite3_mutex *sqlite3_mutex_alloc(int);
@@ -3753,44 +5935,110 @@ int sqlite3_mutex_try(sqlite3_mutex*);
 void sqlite3_mutex_leave(sqlite3_mutex*);
 
 /*
-** CAPI3REF: Mutex Verifcation Routines {F17080}
+** CAPI3REF: Mutex Methods Object {H17120} 
+** EXPERIMENTAL
+**
+** An instance of this structure defines the low-level routines
+** used to allocate and use mutexes.
+**
+** Usually, the default mutex implementations provided by SQLite are
+** sufficient, however the user has the option of substituting a custom
+** implementation for specialized deployments or systems for which SQLite
+** does not provide a suitable implementation. In this case, the user
+** creates and populates an instance of this structure to pass
+** to sqlite3_config() along with the [SQLITE_CONFIG_MUTEX] option.
+** Additionally, an instance of this structure can be used as an
+** output variable when querying the system for the current mutex
+** implementation, using the [SQLITE_CONFIG_GETMUTEX] option.
+**
+** The xMutexInit method defined by this structure is invoked as
+** part of system initialization by the sqlite3_initialize() function.
+** {H17001} The xMutexInit routine shall be called by SQLite once for each
+** effective call to [sqlite3_initialize()].
+**
+** The xMutexEnd method defined by this structure is invoked as
+** part of system shutdown by the sqlite3_shutdown() function. The
+** implementation of this method is expected to release all outstanding
+** resources obtained by the mutex methods implementation, especially
+** those obtained by the xMutexInit method. {H17003} The xMutexEnd()
+** interface shall be invoked once for each call to [sqlite3_shutdown()].
+**
+** The remaining seven methods defined by this structure (xMutexAlloc,
+** xMutexFree, xMutexEnter, xMutexTry, xMutexLeave, xMutexHeld and
+** xMutexNotheld) implement the following interfaces (respectively):
+**
+** 
        
+**   
      •   [sqlite3_mutex_alloc()] 
        • 
+**   
      •   [sqlite3_mutex_free()] 
        • 
+**   
      •   [sqlite3_mutex_enter()] 
        • 
+**   
      •   [sqlite3_mutex_try()] 
        • 
+**   
      •   [sqlite3_mutex_leave()] 
        • 
+**   
      •   [sqlite3_mutex_held()] 
        • 
+**   
      •   [sqlite3_mutex_notheld()] 
        • 
+** 
      
+**
+** The only difference is that the public sqlite3_XXX functions enumerated
+** above silently ignore any invocations that pass a NULL pointer instead
+** of a valid mutex handle. The implementations of the methods defined
+** by this structure are not required to handle this case, the results
+** of passing a NULL pointer instead of a valid mutex handle are undefined
+** (i.e. it is acceptable to provide an implementation that segfaults if
+** it is passed a NULL pointer).
+*/
+typedef struct sqlite3_mutex_methods sqlite3_mutex_methods;
+struct sqlite3_mutex_methods {
+  int (*xMutexInit)(void);
+  int (*xMutexEnd)(void);
+  sqlite3_mutex *(*xMutexAlloc)(int);
+  void (*xMutexFree)(sqlite3_mutex *);
+  void (*xMutexEnter)(sqlite3_mutex *);
+  int (*xMutexTry)(sqlite3_mutex *);
+  void (*xMutexLeave)(sqlite3_mutex *);
+  int (*xMutexHeld)(sqlite3_mutex *);
+  int (*xMutexNotheld)(sqlite3_mutex *);
+};
+
+/*
+** CAPI3REF: Mutex Verification Routines {H17080}  
 **
 ** The sqlite3_mutex_held() and sqlite3_mutex_notheld() routines
-** are intended for use inside assert() statements. {F17081} The SQLite core
+** are intended for use inside assert() statements. {H17081} The SQLite core
 ** never uses these routines except inside an assert() and applications
-** are advised to follow the lead of the core.  {F17082} The core only
+** are advised to follow the lead of the core.  {H17082} The core only
 ** provides implementations for these routines when it is compiled
-** with the SQLITE_DEBUG flag.  {U17087} External mutex implementations
+** with the SQLITE_DEBUG flag.  {A17087} External mutex implementations
 ** are only required to provide these routines if SQLITE_DEBUG is
 ** defined and if NDEBUG is not defined.
 **
-** {F17083} These routines should return true if the mutex in their argument
-** is held or not held, respectively, by the calling thread. {END}
+** {H17083} These routines should return true if the mutex in their argument
+** is held or not held, respectively, by the calling thread.
 **
 ** {X17084} The implementation is not required to provided versions of these
-** routines that actually work.
-** If the implementation does not provide working
-** versions of these routines, it should at least provide stubs
-** that always return true so that one does not get spurious
-** assertion failures. {END}
+** routines that actually work. If the implementation does not provide working
+** versions of these routines, it should at least provide stubs that always
+** return true so that one does not get spurious assertion failures.
 **
-** {F17085} If the argument to sqlite3_mutex_held() is a NULL pointer then
+** {H17085} If the argument to sqlite3_mutex_held() is a NULL pointer then
 ** the routine should return 1.  {END} This seems counter-intuitive since
 ** clearly the mutex cannot be held if it does not exist.  But the
 ** the reason the mutex does not exist is because the build is not
 ** using mutexes.  And we do not want the assert() containing the
 ** call to sqlite3_mutex_held() to fail, so a non-zero return is
-** the appropriate thing to do.  {F17086} The sqlite3_mutex_notheld() 
+** the appropriate thing to do.  {H17086} The sqlite3_mutex_notheld()
 ** interface should also return 1 when given a NULL pointer.
 */
 int sqlite3_mutex_held(sqlite3_mutex*);
 int sqlite3_mutex_notheld(sqlite3_mutex*);
 
 /*
-** CAPI3REF: Mutex Types {F17001}
+** CAPI3REF: Mutex Types {H17001} 
 **
-** {F17002} The [sqlite3_mutex_alloc()] interface takes a single argument
-** which is one of these integer constants. {END}
+** The [sqlite3_mutex_alloc()] interface takes a single argument
+** which is one of these integer constants.
+**
+** The set of static mutexes may change from one SQLite release to the
+** next.  Applications that override the built-in mutex logic must be
+** prepared to accommodate additional static mutexes.
 */
 #define SQLITE_MUTEX_FAST             0
 #define SQLITE_MUTEX_RECURSIVE        1
@@ -3799,26 +6047,27 @@ int sqlite3_mutex_notheld(sqlite3_mutex*);
 #define SQLITE_MUTEX_STATIC_MEM2      4  /* sqlite3_release_memory() */
 #define SQLITE_MUTEX_STATIC_PRNG      5  /* sqlite3_random() */
 #define SQLITE_MUTEX_STATIC_LRU       6  /* lru page list */
+#define SQLITE_MUTEX_STATIC_LRU2      7  /* lru page list */
 
 /*
-** CAPI3REF: Low-Level Control Of Database Files {F11300}
+** CAPI3REF: Low-Level Control Of Database Files {H11300} 
 **
-** {F11301} The [sqlite3_file_control()] interface makes a direct call to the
+** {H11301} The [sqlite3_file_control()] interface makes a direct call to the
 ** xFileControl method for the [sqlite3_io_methods] object associated
-** with a particular database identified by the second argument. {F11302} The
+** with a particular database identified by the second argument. {H11302} The
 ** name of the database is the name assigned to the database by the
 ** ATTACH SQL command that opened the
-** database. {F11303} To control the main database file, use the name "main"
-** or a NULL pointer. {F11304} The third and fourth parameters to this routine
+** database. {H11303} To control the main database file, use the name "main"
+** or a NULL pointer. {H11304} The third and fourth parameters to this routine
 ** are passed directly through to the second and third parameters of
-** the xFileControl method.  {F11305} The return value of the xFileControl
+** the xFileControl method.  {H11305} The return value of the xFileControl
 ** method becomes the return value of this routine.
 **
-** {F11306} If the second parameter (zDbName) does not match the name of any
-** open database file, then SQLITE_ERROR is returned. {F11307} This error
+** {H11306} If the second parameter (zDbName) does not match the name of any
+** open database file, then SQLITE_ERROR is returned. {H11307} This error
 ** code is not remembered and will not be recalled by [sqlite3_errcode()]
-** or [sqlite3_errmsg()]. {U11308} The underlying xFileControl method might
-** also return SQLITE_ERROR.  {U11309} There is no way to distinguish between
+** or [sqlite3_errmsg()]. {A11308} The underlying xFileControl method might
+** also return SQLITE_ERROR.  {A11309} There is no way to distinguish between
 ** an incorrect zDbName and an SQLITE_ERROR return from the underlying
 ** xFileControl method. {END}
 **
@@ -3827,6 +6076,196 @@ int sqlite3_mutex_notheld(sqlite3_mutex*);
 int sqlite3_file_control(sqlite3*, const char *zDbName, int op, void*);
 
 /*
+** CAPI3REF: Testing Interface {H11400} 
+**
+** The sqlite3_test_control() interface is used to read out internal
+** state of SQLite and to inject faults into SQLite for testing
+** purposes.  The first parameter is an operation code that determines
+** the number, meaning, and operation of all subsequent parameters.
+**
+** This interface is not for use by applications.  It exists solely
+** for verifying the correct operation of the SQLite library.  Depending
+** on how the SQLite library is compiled, this interface might not exist.
+**
+** The details of the operation codes, their meanings, the parameters
+** they take, and what they do are all subject to change without notice.
+** Unlike most of the SQLite API, this function is not guaranteed to
+** operate consistently from one release to the next.
+*/
+int sqlite3_test_control(int op, ...);
+
+/*
+** CAPI3REF: Testing Interface Operation Codes {H11410} 
+**
+** These constants are the valid operation code parameters used
+** as the first argument to [sqlite3_test_control()].
+**
+** These parameters and their meanings are subject to change
+** without notice.  These values are for testing purposes only.
+** Applications should not use any of these parameters or the
+** [sqlite3_test_control()] interface.
+*/
+#define SQLITE_TESTCTRL_PRNG_SAVE                5
+#define SQLITE_TESTCTRL_PRNG_RESTORE             6
+#define SQLITE_TESTCTRL_PRNG_RESET               7
+#define SQLITE_TESTCTRL_BITVEC_TEST              8
+#define SQLITE_TESTCTRL_FAULT_INSTALL            9
+#define SQLITE_TESTCTRL_BENIGN_MALLOC_HOOKS     10
+
+/*
+** CAPI3REF: SQLite Runtime Status {H17200} 
+** EXPERIMENTAL
+**
+** This interface is used to retrieve runtime status information
+** about the preformance of SQLite, and optionally to reset various
+** highwater marks.  The first argument is an integer code for
+** the specific parameter to measure.  Recognized integer codes
+** are of the form [SQLITE_STATUS_MEMORY_USED | SQLITE_STATUS_...].
+** The current value of the parameter is returned into *pCurrent.
+** The highest recorded value is returned in *pHighwater.  If the
+** resetFlag is true, then the highest record value is reset after
+** *pHighwater is written. Some parameters do not record the highest
+** value.  For those parameters
+** nothing is written into *pHighwater and the resetFlag is ignored.
+** Other parameters record only the highwater mark and not the current
+** value.  For these latter parameters nothing is written into *pCurrent.
+**
+** This routine returns SQLITE_OK on success and a non-zero
+** [error code] on failure.
+**
+** This routine is threadsafe but is not atomic.  This routine can
+** called while other threads are running the same or different SQLite
+** interfaces.  However the values returned in *pCurrent and
+** *pHighwater reflect the status of SQLite at different points in time
+** and it is possible that another thread might change the parameter
+** in between the times when *pCurrent and *pHighwater are written.
+**
+** See also: [sqlite3_db_status()]
+*/
+int sqlite3_status(int op, int *pCurrent, int *pHighwater, int resetFlag);
+
+/*
+** CAPI3REF: Database Connection Status {H17201} 
+** EXPERIMENTAL
+**
+** This interface is used to retrieve runtime status information 
+** about a single [database connection].  The first argument is the
+** database connection object to be interrogated.  The second argument
+** is the parameter to interrogate.  Currently, the only allowed value
+** for the second parameter is [SQLITE_DBSTATUS_LOOKASIDE_USED].
+** Additional options will likely appear in future releases of SQLite.
+**
+** The current value of the request parameter is written into *pCur
+** and the highest instantaneous value is written into *pHiwtr.  If
+** the resetFlg is true, then the highest instantaneous value is
+** reset back down to the current value.
+**
+** See also: [sqlite3_status()].
+*/
+int sqlite3_db_status(sqlite3*, int op, int *pCur, int *pHiwtr, int resetFlg);
+
+/*
+** CAPI3REF: Status Parameters {H17250} 
+** EXPERIMENTAL
+**
+** These integer constants designate various run-time status parameters
+** that can be returned by [sqlite3_status()].
+**
+** 
      
+** 
      SQLITE_STATUS_MEMORY_USED
      
+** 
      This parameter is the current amount of memory checked out
+** using [sqlite3_malloc()], either directly or indirectly.  The
+** figure includes calls made to [sqlite3_malloc()] by the application
+** and internal memory usage by the SQLite library.  Scratch memory
+** controlled by [SQLITE_CONFIG_SCRATCH] and auxiliary page-cache
+** memory controlled by [SQLITE_CONFIG_PAGECACHE] is not included in
+** this parameter.  The amount returned is the sum of the allocation
+** sizes as reported by the xSize method in [sqlite3_mem_methods].
      
+**
+** 
      SQLITE_STATUS_MALLOC_SIZE
      
+** 
      This parameter records the largest memory allocation request
+** handed to [sqlite3_malloc()] or [sqlite3_realloc()] (or their
+** internal equivalents).  Only the value returned in the
+** *pHighwater parameter to [sqlite3_status()] is of interest.  
+** The value written into the *pCurrent parameter is undefined.
      
+**
+** 
      SQLITE_STATUS_PAGECACHE_USED
      
+** 
      This parameter returns the number of pages used out of the
+** [pagecache memory allocator] that was configured using 
+** [SQLITE_CONFIG_PAGECACHE].  The
+** value returned is in pages, not in bytes.
      
+**
+** 
      SQLITE_STATUS_PAGECACHE_OVERFLOW
      
+** 
      This parameter returns the number of bytes of page cache
+** allocation which could not be statisfied by the [SQLITE_CONFIG_PAGECACHE]
+** buffer and where forced to overflow to [sqlite3_malloc()].  The
+** returned value includes allocations that overflowed because they
+** where too large (they were larger than the "sz" parameter to
+** [SQLITE_CONFIG_PAGECACHE]) and allocations that overflowed because
+** no space was left in the page cache.
      
+**
+** 
      SQLITE_STATUS_PAGECACHE_SIZE
      
+** 
      This parameter records the largest memory allocation request
+** handed to [pagecache memory allocator].  Only the value returned in the
+** *pHighwater parameter to [sqlite3_status()] is of interest.  
+** The value written into the *pCurrent parameter is undefined.
      
+**
+** 
      SQLITE_STATUS_SCRATCH_USED
      
+** 
      This parameter returns the number of allocations used out of the
+** [scratch memory allocator] configured using
+** [SQLITE_CONFIG_SCRATCH].  The value returned is in allocations, not
+** in bytes.  Since a single thread may only have one scratch allocation
+** outstanding at time, this parameter also reports the number of threads
+** using scratch memory at the same time.
      
+**
+** 
      SQLITE_STATUS_SCRATCH_OVERFLOW
      
+** 
      This parameter returns the number of bytes of scratch memory
+** allocation which could not be statisfied by the [SQLITE_CONFIG_SCRATCH]
+** buffer and where forced to overflow to [sqlite3_malloc()].  The values
+** returned include overflows because the requested allocation was too
+** larger (that is, because the requested allocation was larger than the
+** "sz" parameter to [SQLITE_CONFIG_SCRATCH]) and because no scratch buffer
+** slots were available.
+** 
      
+**
+** 
      SQLITE_STATUS_SCRATCH_SIZE
      
+** 
      This parameter records the largest memory allocation request
+** handed to [scratch memory allocator].  Only the value returned in the
+** *pHighwater parameter to [sqlite3_status()] is of interest.  
+** The value written into the *pCurrent parameter is undefined.
      
+**
+** 
      SQLITE_STATUS_PARSER_STACK
      
+** 
      This parameter records the deepest parser stack.  It is only
+** meaningful if SQLite is compiled with [YYTRACKMAXSTACKDEPTH].
      
+** 
      
+**
+** New status parameters may be added from time to time.
+*/
+#define SQLITE_STATUS_MEMORY_USED          0
+#define SQLITE_STATUS_PAGECACHE_USED       1
+#define SQLITE_STATUS_PAGECACHE_OVERFLOW   2
+#define SQLITE_STATUS_SCRATCH_USED         3
+#define SQLITE_STATUS_SCRATCH_OVERFLOW     4
+#define SQLITE_STATUS_MALLOC_SIZE          5
+#define SQLITE_STATUS_PARSER_STACK         6
+#define SQLITE_STATUS_PAGECACHE_SIZE       7
+#define SQLITE_STATUS_SCRATCH_SIZE         8
+
+/*
+** CAPI3REF: Status Parameters for database connections {H17275} 
+** EXPERIMENTAL
+**
+** Status verbs for [sqlite3_db_status()].
+**
+** 
      
+** 
      SQLITE_DBSTATUS_LOOKASIDE_USED
      
+** 
      This parameter returns the number of lookaside memory slots currently
+** checked out.
      
+** 
      
+*/
+#define SQLITE_DBSTATUS_LOOKASIDE_USED     0
+
+/*
 ** Undo the hack that converts floating point types to integer for
 ** builds on processors without floating point support.
 */