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sqlite3.h：源码内容

/*
** 2001 September 15
**
** The author disclaims copyright to this source code. In place of
** a legal notice, here is a blessing:
**
** May you do good and not evil.
** May you find forgiveness for yourself and forgive others.
** May you share freely, never taking more than you give.
**
*************************************************************************
** This header file defines the interface that the SQLite library
** presents to client programs. If a C-function, structure, datatype,
** or constant definition does not appear in this file, then it is
** not a published API of SQLite, is subject to change without
** notice, and should not be referenced by programs that use SQLite.
**
** 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
** to experimental interfaces but reserve to make minor changes if
** experience from use "in the wild" suggest such changes are prudent.
**
** The official C-language API documentation for SQLite is derived
** from comments in this file. This file is the authoritative source
** on how SQLite interfaces are suppose to operate.
**
** The name of this file under configuration management is "sqlite.h.in".
** The makefile makes some minor changes to this file (such as inserting
** the version number) and changes its name to "sqlite3.h" as
** part of the build process.
**
** @(#) $Id: sqlite.h.in,v 1.305 2008/04/16 00:28:14 drh Exp $
*/
#ifndef _SQLITE3_H_
#define _SQLITE3_H_
#include <stdarg.h> /* Needed for the definition of va_list */
/*
** Make sure we can call this stuff from C++.
*/
#ifdef __cplusplus
extern "C" {
#endif
/*
** Add the ability to override 'extern'
*/
#ifndef SQLITE_EXTERN
# define SQLITE_EXTERN extern
#endif
/*
** Make sure these symbols where not defined by some previous header
** file.
*/
#ifdef SQLITE_VERSION
# undef SQLITE_VERSION
#endif
#ifdef SQLITE_VERSION_NUMBER
# undef SQLITE_VERSION_NUMBER
#endif
/*
** CAPI3REF: Compile-Time Library Version Numbers {F10010}
**
** 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 release number
** and is incremented with
** each release but resets back to 0 when Y is incremented.
**
** See also: [sqlite3_libversion()] and [sqlite3_libversion_number()].
**
** INVARIANTS:
**
** {F10011} The SQLITE_VERSION #define in the sqlite3.h header file
** evaluates to a string literal that is the SQLite version
** with which the header file is associated.
**
** {F10014} The SQLITE_VERSION_NUMBER #define resolves 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 "3.5.8"
#define SQLITE_VERSION_NUMBER 3005008
/*
** CAPI3REF: Run-Time Library Version Numbers {F10020}
** 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].
**
** 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:
**
** {F10021} The [sqlite3_libversion_number()] interface returns an integer
** equal to [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.
*/
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}
**
** 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 from more than one thread.
**
** There is a measurable performance penalty for enabling mutexes.
** 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.
**
** INVARIANTS:
**
** {F10101} The [sqlite3_threadsafe()] function returns nonzero if
** SQLite was compiled with its mutexes enabled or zero
** if SQLite was compiled with mutexes disabled.
*/
int sqlite3_threadsafe(void);
/*
** CAPI3REF: Database Connection Handle {F12000}
** KEYWORDS: {database connection}
**
** 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
** 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.
*/
typedef struct sqlite3 sqlite3;
/*
** CAPI3REF: 64-Bit Integer Types {F10200}
** KEYWORDS: sqlite_int64 sqlite_uint64
**
** Because there is no cross-platform way to specify 64-bit integer types
** SQLite includes typedefs for 64-bit signed and unsigned integers.
**
** 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:
**
** {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.
*/
#ifdef SQLITE_INT64_TYPE
typedef SQLITE_INT64_TYPE sqlite_int64;
typedef unsigned SQLITE_INT64_TYPE sqlite_uint64;
#elif defined(_MSC_VER) || defined(__BORLANDC__)
typedef __int64 sqlite_int64;
typedef unsigned __int64 sqlite_uint64;
#else
typedef /*long*/ long int sqlite_int64;
typedef unsigned /*long*/ long int sqlite_uint64;
#endif
typedef sqlite_int64 sqlite3_int64;
typedef sqlite_uint64 sqlite3_uint64;
/*
** If compiling for a processor that lacks floating point support,
** substitute integer for floating-point
*/
#ifdef SQLITE_OMIT_FLOATING_POINT
# define double sqlite3_int64
#endif
/*
** CAPI3REF: Closing A Database Connection {F12010}
**
** This routine is the destructor for the [sqlite3] object.
**
** Applications should [sqlite3_finalize | finalize] all
** [prepared statements] and
** [sqlite3_blob_close | close] all [sqlite3_blob | BLOBs]
** associated with the [sqlite3] object prior
** to attempting to close the [sqlite3] object.
**
** <todo>What happens to pending transactions? Are they
** rolled back, or abandoned?</todo>
**
** INVARIANTS:
**
** {F12011} The [sqlite3_close()] interface destroys an [sqlite3] object
** allocated by a prior call to [sqlite3_open()],
** [sqlite3_open16()], or [sqlite3_open_v2()].
**
** {F12012} The [sqlite3_close()] function releases all memory used by the
** connection and closes all open files.
**
** {F12013} If the database connection contains
** [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.
**
** LIMITATIONS:
**
** {U12015} The parameter to [sqlite3_close()] must be an [sqlite3] object
** pointer previously obtained from [sqlite3_open()] or the
** equivalent, or NULL.
**
** {U12016} The parameter to [sqlite3_close()] must not have been previously
** closed.
*/
int sqlite3_close(sqlite3 *);
/*
** The type for a callback function.
** This is legacy and deprecated. It is included for historical
** compatibility and is not documented.
*/
typedef int (*sqlite3_callback)(void*,int,char**, char**);
/*
** CAPI3REF: One-Step Query Execution Interface {F12100}
**
** The sqlite3_exec() interface is a convenient way of running
** one or more SQL statements without a lot of C code. The
** 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 sqlite3_exec() interface is implemented in terms of
** [sqlite3_prepare_v2()], [sqlite3_step()], and [sqlite3_finalize()].
** The sqlite3_exec() routine does nothing that cannot be done
** by [sqlite3_prepare_v2()], [sqlite3_step()], and [sqlite3_finalize()].
** The sqlite3_exec() is just a convenient wrapper.
**
** INVARIANTS:
**
** {F12101} The [sqlite3_exec()] interface evaluates zero or more UTF-8
** encoded, semicolon-separated, SQL statements in the
** zero-terminated string of its 2nd parameter within the
** context of the [sqlite3] object given in the 1st parameter.
**
** {F12104} The return value of [sqlite3_exec()] is SQLITE_OK if all
** SQL statements run successfully.
**
** {F12105} The return value of [sqlite3_exec()] is an appropriate
** non-zero error code if any SQL statement fails.
**
** {F12107} 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 is
** invoked once for each row of result.
**
** {F12110} If the callback returns a non-zero value then [sqlite3_exec()]
** will aborted the SQL statement it is currently evaluating,
** skip all subsequent SQL statements, and return [SQLITE_ABORT].
** <todo>What happens to *errmsg here? Does the result code for
** sqlite3_errcode() get set?</todo>
**
** {F12113} The [sqlite3_exec()] routine will pass its 4th parameter through
** as the 1st parameter of the callback.
**
** {F12116} The [sqlite3_exec()] routine sets the 2nd parameter of its
** callback to be the number of columns in the current row of
** result.
**
** {F12119} The [sqlite3_exec()] routine sets 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()].
**
** {F12122} The [sqlite3_exec()] routine sets 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()].
**
** {F12125} If the 3rd parameter to [sqlite3_exec()] is NULL then
** [sqlite3_exec()] never invokes a callback. All query
** results are silently discarded.
**
** {F12128} If an error occurs while parsing or evaluating any of the SQL
** statements handed to [sqlite3_exec()] then [sqlite3_exec()] will
** return an [error code] other than [SQLITE_OK].
**
** {F12131} If an error occurs while parsing or evaluating any of the SQL
** handed to [sqlite3_exec()] and if the 5th parameter (errmsg)
** to [sqlite3_exec()] is not NULL, then an error message is
** allocated using the equivalent of [sqlite3_mprintf()] and
** *errmsg is made to point to that message.
**
** {F12134} The [sqlite3_exec()] routine does not change the value of
** *errmsg if errmsg is NULL or if there are no errors.
**
** {F12137} The [sqlite3_exec()] function sets the error code and message
** accessible via [sqlite3_errcode()], [sqlite3_errmsg()], and
** [sqlite3_errmsg16()].
**
** LIMITATIONS:
**
** {U12141} The first parameter to [sqlite3_exec()] must be an valid and open
** [database connection].
**
** {U12142} The database connection must not be closed while
** [sqlite3_exec()] is running.
**
** {U12143} The calling function is should use [sqlite3_free()] to free
** the memory that *errmsg is left pointing at once the error
** message is no longer needed.
**
** {U12145} 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 */
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 {error code} {error codes}
**
** Many SQLite functions return an integer result code from the set shown
** here in order to indicates success or failure.
**
** See also: [SQLITE_IOERR_READ | extended result codes]
*/
#define SQLITE_OK 0 /* Successful result */
/* beginning-of-error-codes */
#define SQLITE_ERROR 1 /* SQL error or missing database */
#define SQLITE_INTERNAL 2 /* Internal logic error in SQLite */
#define SQLITE_PERM 3 /* Access permission denied */
#define SQLITE_ABORT 4 /* Callback routine requested an abort */
#define SQLITE_BUSY 5 /* The database file is locked */
#define SQLITE_LOCKED 6 /* A table in the database is locked */
#define SQLITE_NOMEM 7 /* A malloc() failed */
#define SQLITE_READONLY 8 /* Attempt to write a readonly database */
#define SQLITE_INTERRUPT 9 /* Operation terminated by sqlite3_interrupt()*/
#define SQLITE_IOERR 10 /* Some kind of disk I/O error occurred */
#define SQLITE_CORRUPT 11 /* The database disk image is malformed */
#define SQLITE_NOTFOUND 12 /* NOT USED. Table or record not found */
#define SQLITE_FULL 13 /* Insertion failed because database is full */
#define SQLITE_CANTOPEN 14 /* Unable to open the database file */
#define SQLITE_PROTOCOL 15 /* NOT USED. Database lock protocol error */
#define SQLITE_EMPTY 16 /* Database is empty */
#define SQLITE_SCHEMA 17 /* The database schema changed */
#define SQLITE_TOOBIG 18 /* String or BLOB exceeds size limit */
#define SQLITE_CONSTRAINT 19 /* Abort due to constraint violation */
#define SQLITE_MISMATCH 20 /* Data type mismatch */
#define SQLITE_MISUSE 21 /* Library used incorrectly */
#define SQLITE_NOLFS 22 /* Uses OS features not supported on host */
#define SQLITE_AUTH 23 /* Authorization denied */
#define SQLITE_FORMAT 24 /* Auxiliary database format error */
#define SQLITE_RANGE 25 /* 2nd parameter to sqlite3_bind out of range */
#define SQLITE_NOTADB 26 /* File opened that is not a database file */
#define SQLITE_ROW 100 /* sqlite3_step() has another row ready */
#define SQLITE_DONE 101 /* sqlite3_step() has finished executing */
/* end-of-error-codes */
/*
** CAPI3REF: Extended Result Codes {F10220}
** KEYWORDS: {extended error code} {extended error codes}
** KEYWORDS: {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
** 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. The extended result codes are enabled or disabled
** for each database connection 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:
**
** {F10223} The symbolic name for an extended result code always contains
** a related primary result code as a prefix.
**
** {F10224} Primary result code names contain a single "_" character.
**
** {F10225} Extended result code names contain two or more "_" characters.
**
** {F10226} The numeric value of an extended result code contains 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}
**
** 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
#define SQLITE_OPEN_READWRITE 0x00000002
#define SQLITE_OPEN_CREATE 0x00000004
#define SQLITE_OPEN_DELETEONCLOSE 0x00000008
#define SQLITE_OPEN_EXCLUSIVE 0x00000010
#define SQLITE_OPEN_MAIN_DB 0x00000100
#define SQLITE_OPEN_TEMP_DB 0x00000200
#define SQLITE_OPEN_TRANSIENT_DB 0x00000400
#define SQLITE_OPEN_MAIN_JOURNAL 0x00000800
#define SQLITE_OPEN_TEMP_JOURNAL 0x00001000
#define SQLITE_OPEN_SUBJOURNAL 0x00002000
#define SQLITE_OPEN_MASTER_JOURNAL 0x00004000
/*
** CAPI3REF: Device Characteristics {F10240}
**
** 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.
**
** 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. 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. The SQLITE_IOCAP_SEQUENTIAL property means that
** information is written to disk in the same order as calls
** to xWrite().
*/
#define SQLITE_IOCAP_ATOMIC 0x00000001
#define SQLITE_IOCAP_ATOMIC512 0x00000002
#define SQLITE_IOCAP_ATOMIC1K 0x00000004
#define SQLITE_IOCAP_ATOMIC2K 0x00000008
#define SQLITE_IOCAP_ATOMIC4K 0x00000010
#define SQLITE_IOCAP_ATOMIC8K 0x00000020
#define SQLITE_IOCAP_ATOMIC16K 0x00000040
#define SQLITE_IOCAP_ATOMIC32K 0x00000080
#define SQLITE_IOCAP_ATOMIC64K 0x00000100
#define SQLITE_IOCAP_SAFE_APPEND 0x00000200
#define SQLITE_IOCAP_SEQUENTIAL 0x00000400
/*
** CAPI3REF: File Locking Levels {F10250}
**
** 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.
*/
#define SQLITE_LOCK_NONE 0
#define SQLITE_LOCK_SHARED 1
#define SQLITE_LOCK_RESERVED 2
#define SQLITE_LOCK_PENDING 3
#define SQLITE_LOCK_EXCLUSIVE 4
/*
** CAPI3REF: Synchronization Type Flags {F10260}
**
** When SQLite invokes the xSync() method of an
** [sqlite3_io_methods] object it uses a combination of
** these integer values as the second argument.
**
** 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. 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}
**
** An [sqlite3_file] object represents an open file in the OS
** interface layer. Individual OS interface implementations will
** want to subclass this object by appending additional fields
** for their own use. The pMethods entry is a pointer to an
** [sqlite3_io_methods] object that defines methods for performing
** I/O operations on the open file.
*/
typedef struct sqlite3_file sqlite3_file;
struct sqlite3_file {
const struct sqlite3_io_methods *pMethods; /* Methods for an open file */
};
/*
** CAPI3REF: OS Interface File Virtual Methods Object {F11120}
**
** Every file opened by the [sqlite3_vfs] xOpen method contains a pointer to
** an instance of this object. This object defines the
** methods used to perform various operations against the open file.
**
** 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 integer values to xLock() and xUnlock() are one of
** <ul>
** <li> [SQLITE_LOCK_NONE],
** <li> [SQLITE_LOCK_SHARED],
** <li> [SQLITE_LOCK_RESERVED],
** <li> [SQLITE_LOCK_PENDING], or
** <li> [SQLITE_LOCK_EXCLUSIVE].
** </ul>
** 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,
** PENDING, or EXCLUSIVE lock on the file. It returns true
** if such a lock exists and false if not.
**
** 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
** 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.
** A [SQLITE_FCNTL_LOCKSTATE | list of opcodes] less than 100 is available.
** 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
** device that underlies the file. The sector size is the
** minimum write that can be performed without disturbing
** other bytes in the file. The xDeviceCharacteristics()
** method returns a bit vector describing behaviors of the
** underlying device:
**
** <ul>
** <li> [SQLITE_IOCAP_ATOMIC]
** <li> [SQLITE_IOCAP_ATOMIC512]
** <li> [SQLITE_IOCAP_ATOMIC1K]
** <li> [SQLITE_IOCAP_ATOMIC2K]
** <li> [SQLITE_IOCAP_ATOMIC4K]
** <li> [SQLITE_IOCAP_ATOMIC8K]
** <li> [SQLITE_IOCAP_ATOMIC16K]
** <li> [SQLITE_IOCAP_ATOMIC32K]
** <li> [SQLITE_IOCAP_ATOMIC64K]
** <li> [SQLITE_IOCAP_SAFE_APPEND]
** <li> [SQLITE_IOCAP_SEQUENTIAL]
** </ul>
**
** 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. 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. The SQLITE_IOCAP_SEQUENTIAL property means that
** information is written to disk in the same order as calls
** to xWrite().
*/
typedef struct sqlite3_io_methods sqlite3_io_methods;
struct sqlite3_io_methods {
int iVersion;
int (*xClose)(sqlite3_file*);
int (*xRead)(sqlite3_file*, void*, int iAmt, sqlite3_int64 iOfst);
int (*xWrite)(sqlite3_file*, const void*, int iAmt, sqlite3_int64 iOfst);
int (*xTruncate)(sqlite3_file*, sqlite3_int64 size);
int (*xSync)(sqlite3_file*, int flags);
int (*xFileSize)(sqlite3_file*, sqlite3_int64 *pSize);
int (*xLock)(sqlite3_file*, int);
int (*xUnlock)(sqlite3_file*, int);
int (*xCheckReservedLock)(sqlite3_file*);
int (*xFileControl)(sqlite3_file*, int op, void *pArg);
int (*xSectorSize)(sqlite3_file*);
int (*xDeviceCharacteristics)(sqlite3_file*);
/* Additional methods may be added in future releases */
};
/*
** CAPI3REF: Standard File Control Opcodes {F11310}
**
** These integer constants are opcodes for the xFileControl method
** of the [sqlite3_io_methods] object and to the [sqlite3_file_control()]
** interface.
**
** 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. 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}
**
** The mutex module within SQLite defines [sqlite3_mutex] to be an
** 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()].
*/
typedef struct sqlite3_mutex sqlite3_mutex;
/*
** CAPI3REF: OS Interface Object {F11140}
**
** An instance of this 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 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 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.
**
** 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
** object once the object has been registered.
**
** 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
** filename if it needs to remember the filename for some reason.
**
** {F11142} 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()
** call, depending on the object being opened:
**
** <ul>
** <li> [SQLITE_OPEN_MAIN_DB]
** <li> [SQLITE_OPEN_MAIN_JOURNAL]
** <li> [SQLITE_OPEN_TEMP_DB]
** <li> [SQLITE_OPEN_TEMP_JOURNAL]
** <li> [SQLITE_OPEN_TRANSIENT_DB]
** <li> [SQLITE_OPEN_SUBJOURNAL]
** <li> [SQLITE_OPEN_MASTER_JOURNAL]
** </ul> {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 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:
**
** <ul>
** <li> [SQLITE_OPEN_DELETEONCLOSE]
** <li> [SQLITE_OPEN_EXCLUSIVE]
** </ul>
**
** {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
** for exclusive access. This flag is set for all files except
** for the main database file. {END}
**
** {F11148} 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
** directory.
**
** {F11150} SQLite will always allocate at least mxPathname+1 bytes 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.
**
** 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 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.
*/
typedef struct sqlite3_vfs sqlite3_vfs;
struct sqlite3_vfs {
int iVersion; /* Structure version number */
int szOsFile; /* Size of subclassed sqlite3_file */
int mxPathname; /* Maximum file pathname length */
sqlite3_vfs *pNext; /* Next registered VFS */
const char *zName; /* Name of this virtual file system */
void *pAppData; /* Pointer to application-specific data */
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 (*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);
void *(*xDlSym)(sqlite3_vfs*,void*, const char *zSymbol);
void (*xDlClose)(sqlite3_vfs*, void*);
int (*xRandomness)(sqlite3_vfs*, int nByte, char *zOut);
int (*xSleep)(sqlite3_vfs*, int microseconds);
int (*xCurrentTime)(sqlite3_vfs*, double*);
/* New fields may be appended in figure versions. The iVersion
** value will increment whenever this happens. */
};
/*
** CAPI3REF: Flags for the xAccess VFS method {F11190}
**
** {F11191} These integer constants can be used as the third parameter to
** the xAccess method of an [sqlite3_vfs] object. {END} They determine
** 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.
*/
#define SQLITE_ACCESS_EXISTS 0
#define SQLITE_ACCESS_READWRITE 1
#define SQLITE_ACCESS_READ 2
/*
** CAPI3REF: Enable Or Disable Extended Result Codes {F12200}
**
** The sqlite3_extended_result_codes() routine enables or disables the
** [SQLITE_IOERR_READ | extended result codes] feature of SQLite.
** The extended result codes are disabled by default for historical
** compatibility.
**
** INVARIANTS:
**
** {F12201} Each new [database connection] has the
** [extended result codes] feature
** disabled by default.
**
** {F12202} The [sqlite3_extended_result_codes(D,F)] interface will 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}
**
** 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. If
** the table has a column of type INTEGER PRIMARY KEY then that column
** is another alias for the rowid.
**
** This routine returns the rowid of the most recent
** successful INSERT into the database from the database connection
** shown in the first argument. If no successful inserts
** have ever occurred on this 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. 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.
**
** For the purposes of this routine, an insert is considered to
** be successful even if it is subsequently rolled back.
**
** INVARIANTS:
**
** {F12221} The [sqlite3_last_insert_rowid()] function returns the
** rowid of the most recent successful insert done
** on the same database connection and within the same
** trigger context, or zero if there have
** been no qualifying inserts on that connection.
**
** {F12223} The [sqlite3_last_insert_rowid()] function returns
** same value when called from the same trigger context
** immediately before and after a ROLLBACK.
**
** LIMITATIONS:
**
** {U12232} If a separate thread does 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}
**
** 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. 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.
**
** 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.
**
** So 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.
** However, the number returned does not include in changes
** caused by subtriggers since they 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.
** To get an accurate count of the number of rows deleted, use
** "DELETE FROM table WHERE 1" instead.
**
** INVARIANTS:
**
** {F12241} The [sqlite3_changes()] function returns the number of
** row changes caused by the most recent INSERT, UPDATE,
** or DELETE statement on the same database connection and
** within the same trigger context, or zero if there have
** not been any qualifying row changes.
**
** LIMITATIONS:
**
** {U12252} If a separate thread makes changes on the same database connection
** while [sqlite3_changes()] is running then the value returned
** is unpredictable and unmeaningful.
*/
int sqlite3_changes(sqlite3*);
/*
** CAPI3REF: Total Number Of Rows Modified {F12260}
***
** This function returns the number of row changes caused
** by INSERT, UPDATE or DELETE statements since the database handle
** was opened. The count includes all changes from all trigger
** contexts. But 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 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
** "DELETE FROM table WHERE 1" instead.
**
** See also the [sqlite3_changes()] interface.
**
** INVARIANTS:
**
** {F12261} 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.
**
** LIMITATIONS:
**
** {U12264} If a separate thread makes changes on the same database connection
** while [sqlite3_total_changes()] is running then the value
** returned is unpredictable and unmeaningful.
*/
int sqlite3_total_changes(sqlite3*);
/*
** CAPI3REF: Interrupt A Long-Running Query {F12270}
**
** 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.
**
** 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.
** 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:
**
** {F12271} 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.
**
** {F12272} Any SQL statement that is interrupted by [sqlite3_interrupt()]
** will return [SQLITE_INTERRUPT].
**
** LIMITATIONS:
**
** {U12279} 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}
**
** 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 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 and
** so will not detect syntactically incorrect SQL.
**
** INVARIANTS:
**
** {F10511} The sqlite3_complete() and sqlite3_complete16() functions
** return true (non-zero) 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.
**
** LIMITATIONS:
**
** {U10512} The input to sqlite3_complete() must be a zero-terminated
** UTF-8 string.
**
** {U10513} 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}
**
** 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.
** 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 this routine. The second argument to
** the handler 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.
** 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.
** 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
** to promote to an exclusive lock. The first process cannot proceed
** because it is blocked by the second and the second process cannot
** proceed because it is blocked by the first. If both processes
** invoke the busy handlers, neither will make any progress. Therefore,
** SQLite returns [SQLITE_BUSY] for the first process, hoping that this
** will induce the first process to release its read lock and allow
** the second process to proceed.
**
** The default busy callback is NULL.
**
** 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. 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. 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]. This error code promotion
** forces an automatic rollback of the changes. See the
** <a href="http://www.sqlite.org/cvstrac/wiki?p=CorruptionFollowingBusyError">
** CorruptionFollowingBusyError</a> wiki page for a discussion of why
** this is important.
**
** There can only be a single busy handler defined for each database
** connection. Setting a new busy handler clears any previous one.
** Note that calling [sqlite3_busy_timeout()] will also set or clear
** the busy handler.
**
** INVARIANTS:
**
** {F12311} The [sqlite3_busy_handler()] function replaces the busy handler
** callback in the database connection identified by the 1st
** parameter with a new busy handler identified by the 2nd and 3rd
** parameters.
**
** {F12312} The default busy handler for new database connections is NULL.
**
** {F12314} When two or more database connection share a common cache,
** the busy handler for the database connection currently using
** the cache is invoked when the cache encounters a lock.
**
** {F12316} If a busy handler callback returns zero, then the SQLite
** interface that provoked the locking event will return
** [SQLITE_BUSY].
**
** {F12318} SQLite will invokes the busy handler with two argument 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.
**
** LIMITATIONS:
**
** {U12319} A busy handler should not call 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}
**
** This routine sets a [sqlite3_busy_handler | busy handler]
** that sleeps for a while when a
** table is locked. 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].
**
** Calling this routine with an argument less than or equal to zero
** turns off all busy handlers.
**
** 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
** this routine, that other busy handler is cleared.
**
** INVARIANTS:
**
** {F12341} The [sqlite3_busy_timeout()] function overrides any prior
** [sqlite3_busy_timeout()] or [sqlite3_busy_handler()] setting
** on the same database connection.
**
** {F12343} If the 2nd parameter to [sqlite3_busy_timeout()] is less than
** or equal to zero, then the busy handler is cleared so that
** all subsequent locking events immediately return [SQLITE_BUSY].
**
** {F12344} If the 2nd parameter to [sqlite3_busy_timeout()] is a positive
** number N, then a busy handler is set that repeatedly calls
** the xSleep() method in the 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}
**
** 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 are give a NULL pointer. All other values are in
** their UTF-8 zero-terminated string representation as returned by
** [sqlite3_column_text()].
**
** A result table might consists 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 of the result table format, suppose a query result
** is as follows:
**
** <blockquote><pre>
** Name | Age
** -----------------------
** Alice | 43
** Bob | 28
** Cindy | 21
** </pre></blockquote>
**
** 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:
**
** <blockquote><pre>
** azResult[0] = "Name";
** azResult[1] = "Age";
** azResult[2] = "Alice";
** azResult[3] = "43";
** azResult[4] = "Bob";
** azResult[5] = "28";
** azResult[6] = "Cindy";
** azResult[7] = "21";
** </pre></blockquote>
**
** 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 malloc-ed. 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:
**
** {F12371} If a [sqlite3_get_table()] fails a memory allocation, then
** it frees the result table under construction, aborts the
** query in process, skips any subsequent queries, sets the
** *resultp output pointer to NULL and returns [SQLITE_NOMEM].
**
** {F12373} If the ncolumn parameter to [sqlite3_get_table()] is not NULL
** then [sqlite3_get_table()] write the number of columns in the
** result set of the query into *ncolumn if the query is
** successful (if the function returns SQLITE_OK).
**
** {F12374} If the nrow parameter to [sqlite3_get_table()] is not NULL
** then [sqlite3_get_table()] write the number of rows in the
** result set of the query into *nrow if the query is
** successful (if the function returns SQLITE_OK).
**
** {F12376} The [sqlite3_get_table()] function sets its *ncolumn value
** to the number of columns in the result set of the query in the
** sql parameter, or to zero if the query in sql has an empty
** result set.
*/
int sqlite3_get_table(
sqlite3*, /* An open database */
const char *sql, /* SQL to be evaluated */
char ***pResult, /* Results of the query */
int *nrow, /* Number of result rows written here */
int *ncolumn, /* Number of result columns written here */
char **errmsg /* Error msg written here */
);
void sqlite3_free_table(char **result);
/*
** CAPI3REF: Formatted String Printing Functions {F17400}
**
** These routines are workalikes of the "printf()" family of functions
** from the standard C library.
**
** The sqlite3_mprintf() and sqlite3_vmprintf() routines write their
** results into memory obtained from [sqlite3_malloc()].
** 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.
**
** 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. 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. Note also that sqlite3_snprintf()
** returns a pointer to its buffer instead of the number of
** 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.
**
** 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. 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
** is are "%q", "%Q", and "%z" options.
**
** 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. 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:
**
** <blockquote><pre>
** char *zText = "It's a happy day!";
** </pre></blockquote>
**
** One can use this text in an SQL statement as follows:
**
** <blockquote><pre>
** char *zSQL = sqlite3_mprintf("INSERT INTO table VALUES('%q')", zText);
** sqlite3_exec(db, zSQL, 0, 0, 0);
** sqlite3_free(zSQL);
** </pre></blockquote>
**
** Because the %q format string is used, the ''' character in zText
** is escaped and the SQL generated is as follows:
**
** <blockquote><pre>
** INSERT INTO table1 VALUES('It''s a happy day!')
** </pre></blockquote>
**
** This is correct. Had we used %s instead of %q, the generated SQL
** would have looked like this:
**
** <blockquote><pre>
** INSERT INTO table1 VALUES('It's a happy day!');
** </pre></blockquote>
**
** 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.
**
** 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:
**
** <blockquote><pre>
** char *zSQL = sqlite3_mprintf("INSERT INTO table VALUES(%Q)", zText);
** sqlite3_exec(db, zSQL, 0, 0, 0);
** sqlite3_free(zSQL);
** </pre></blockquote>
**
** The code above will render a correct SQL statement in the zSQL
** variable even if the zText variable is a NULL pointer.
**
** 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:
**
** {F17403} 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.
**
** {F17406} 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.
**
** {F17407} The [sqlite3_snprintf()] interface does not writes 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}
**
** 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.
**
** The sqlite3_malloc() routine returns a pointer to a block
** of memory at least N bytes in length, where N is the parameter.
** 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.
**
** Calling sqlite3_free() with a pointer previously returned
** by sqlite3_malloc() or sqlite3_realloc() releases that memory so
** 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. 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.
** 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().
**
** 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. 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().
** 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().
** Sqlite3_realloc() returns a pointer to a memory allocation
** of at least N bytes in size or NULL if sufficient memory is unavailable.
** 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.
** If sqlite3_realloc() returns NULL, then the prior allocation
** is not freed.
**
** The memory returned by sqlite3_malloc() and sqlite3_realloc()
** is always aligned to at least an 8 byte boundary. {END}
**
** 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
**
** <blockquote> SQLITE_MEMORY_SIZE=NNN </blockquote>
**
** 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.
**
** 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.
**
** 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
** installation. Memory allocation errors are detected, but
** they are reported back as [SQLITE_CANTOPEN] or
** [SQLITE_IOERR] rather than [SQLITE_NOMEM].
**
** INVARIANTS:
**
** {F17303} The [sqlite3_malloc(N)] interface returns either a pointer to
** 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.
**
** {F17304} The [sqlite3_malloc(N)] interface returns a NULL pointer if
** N is less than or equal to zero.
**
** {F17305} The [sqlite3_free(P)] interface releases memory previously
** returned from [sqlite3_malloc()] or [sqlite3_realloc()],
** making it available for reuse.
**
** {F17306} A call to [sqlite3_free(NULL)] is a harmless no-op.
**
** {F17310} A call to [sqlite3_realloc(0,N)] is equivalent to a call
** to [sqlite3_malloc(N)].
**
** {F17312} A call to [sqlite3_realloc(P,0)] is equivalent to a call
** to [sqlite3_free(P)].
**
** {F17315} The SQLite core uses [sqlite3_malloc()], [sqlite3_realloc()],
** and [sqlite3_free()] for all of its memory allocation and
** deallocation needs.
**
** {F17318} 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.
**
** {F17321} 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
** where K is the lessor of N and the size of the buffer P.
**
** {F17322} When [sqlite3_realloc(P,N)] returns a non-NULL pointer, it first
** releases the buffer P.
**
** {F17323} When [sqlite3_realloc(P,N)] returns NULL, the buffer P is
** not modified or released.
**
** LIMITATIONS:
**
** {U17350} The pointer arguments to [sqlite3_free()] and [sqlite3_realloc()]
** must be either NULL or else a pointer obtained from a prior
** invocation of [sqlite3_malloc()] or [sqlite3_realloc()] that has
** not been released.
**
** {U17351} 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}
**
** SQLite provides these two interfaces for reporting on the status
** of the [sqlite3_malloc()], [sqlite3_free()], and [sqlite3_realloc()]
** the memory allocation subsystem included within the SQLite.
**
** INVARIANTS:
**
** {F17371} The [sqlite3_memory_used()] routine returns the
** number of bytes of memory currently outstanding
** (malloced but not freed).
**
** {F17373} The [sqlite3_memory_highwater()] routine returns the maximum
** value of [sqlite3_memory_used()]
** since the highwater mark was last reset.
**
** {F17374} 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.
**
** {F17375} The memory highwater 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 highwater mark
** prior to the reset.
*/
sqlite3_int64 sqlite3_memory_used(void);
sqlite3_int64 sqlite3_memory_highwater(int resetFlag);
/*
** CAPI3REF: Pseudo-Random Number Generator {F17390}
**
** 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
** appliations to access the same PRNG for other purposes.
**
** 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:
**
** {F17392} 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 {F12500}
**
** 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()]. 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
** 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. 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 will fail with an error message.
**
** When the callback returns [SQLITE_OK], that means the operation
** requested is ok. When the callback returns [SQLITE_DENY], the
** [sqlite3_prepare_v2()] or equivalent call that triggered the
** 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
** that 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 [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.
**
** 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. 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:
**
** {F12501} The [sqlite3_set_authorizer(D,...)] interface registers a
** authorizer callback with database connection D.
**
** {F12502} The authorizer callback is invoked as SQL statements are
** being compiled
**
** {F12503} 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.
**
** {F12504} When the authorizer callback returns [SQLITE_OK], the operation
** described is coded normally.
**
** {F12505} 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.
**
** {F12506} 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.
**
** {F12507} 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].
**
** {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.
**
** {F12512} The third through sixth parameters to the callback are
** zero-terminated strings that contain
** additional details about the action to be authorized.
**
** {F12520} Each call to [sqlite3_set_authorizer()] overrides the
** any previously installed authorizer.
**
** {F12521} A NULL authorizer means that no authorization
** callback is invoked.
**
** {F12522} The default authorizer is NULL.
*/
int sqlite3_set_authorizer(
sqlite3*,
int (*xAuth)(void*,int,const char*,const char*,const char*,const char*),
void *pUserData
);
/*
** CAPI3REF: Authorizer Return Codes {F12590}
**
** The [sqlite3_set_authorizer | authorizer callback function] must
** return either [SQLITE_OK] or one of these two constants in order
** to signal SQLite whether or not the action is permitted. See the
** [sqlite3_set_authorizer | authorizer documentation] for additional
** information.
*/
#define SQLITE_DENY 1 /* Abort the SQL statement with an error */
#define SQLITE_IGNORE 2 /* Don't allow access, but don't generate an error */
/*
** CAPI3REF: Authorizer Action Codes {F12550}
**
** The [sqlite3_set_authorizer()] interface registers a callback function
** that is invoked to authorizer 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.
**
** 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. 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
** top-level SQL code.
**
** INVARIANTS:
**
** {F12551} 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.
**
** {F12552} The 3rd and 4th parameters to the
** [sqlite3_set_authorizer | authorization callback function]
** will be parameters or NULL depending on which
** [SQLITE_COPY | authorizer code] is used as the second parameter.
**
** {F12553} The 5th parameter to the
** [sqlite3_set_authorizer | authorizer callback] is the name
** of the database (example: "main", "temp", etc.) if applicable.
**
** {F12554} 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 */
#define SQLITE_CREATE_TABLE 2 /* Table Name NULL */
#define SQLITE_CREATE_TEMP_INDEX 3 /* Index Name Table Name */
#define SQLITE_CREATE_TEMP_TABLE 4 /* Table Name NULL */
#define SQLITE_CREATE_TEMP_TRIGGER 5 /* Trigger Name Table Name */
#define SQLITE_CREATE_TEMP_VIEW 6 /* View Name NULL */
#define SQLITE_CREATE_TRIGGER 7 /* Trigger Name Table Name */
#define SQLITE_CREATE_VIEW 8 /* View Name NULL */
#define SQLITE_DELETE 9 /* Table Name NULL */
#define SQLITE_DROP_INDEX 10 /* Index Name Table Name */
#define SQLITE_DROP_TABLE 11 /* Table Name NULL */
#define SQLITE_DROP_TEMP_INDEX 12 /* Index Name Table Name */
#define SQLITE_DROP_TEMP_TABLE 13 /* Table Name NULL */
#define SQLITE_DROP_TEMP_TRIGGER 14 /* Trigger Name Table Name */
#define SQLITE_DROP_TEMP_VIEW 15 /* View Name NULL */
#define SQLITE_DROP_TRIGGER 16 /* Trigger Name Table Name */
#define SQLITE_DROP_VIEW 17 /* View Name NULL */
#define SQLITE_INSERT 18 /* Table Name NULL */
#define SQLITE_PRAGMA 19 /* Pragma Name 1st arg or NULL */
#define SQLITE_READ 20 /* Table Name Column Name */
#define SQLITE_SELECT 21 /* NULL NULL */
#define SQLITE_TRANSACTION 22 /* NULL NULL */
#define SQLITE_UPDATE 23 /* Table Name Column Name */
#define SQLITE_ATTACH 24 /* Filename NULL */
#define SQLITE_DETACH 25 /* Database Name NULL */
#define SQLITE_ALTER_TABLE 26 /* Database Name Table Name */
#define SQLITE_REINDEX 27 /* Index Name NULL */
#define SQLITE_ANALYZE 28 /* Table Name NULL */
#define SQLITE_CREATE_VTABLE 29 /* Table Name Module Name */
#define SQLITE_DROP_VTABLE 30 /* Table Name Module Name */
#define SQLITE_FUNCTION 31 /* Function Name NULL */
#define SQLITE_COPY 0 /* No longer used */
/*
** CAPI3REF: Tracing And Profiling Functions {F12280}
**
** These routines register callback functions that can be used for
** tracing and profiling the execution of SQL statements.
**
** 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 triggersubprogram 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.
**
** The sqlite3_profile() API is currently considered experimental and
** is subject to change or removal in a future release.
**
** The trigger reporting feature of the trace callback is considered
** experimental and is subject to change or removal in future releases.
** Future versions of SQLite might also add new trace callback
** invocations.
**
** INVARIANTS:
**
** {F12281} 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.
**
** {F12282} Each call to [sqlite3_trace()] overrides the previously
** registered trace callback.
**
** {F12283} A NULL trace callback 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, or an SQL comment indicating the beginning
** of a trigger subprogram.
**
** {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.
*/
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}
**
** 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()]. An example use for this
** interface is to keep a GUI updated during a large query.
**
** If the progress callback returns non-zero, the opertion is
** interrupted. This feature can be used to implement a
** "Cancel" button on a GUI dialog box.
**
** INVARIANTS:
**
** {F12911} The callback function registered by [sqlite3_progress_handler()]
** is invoked periodically during long running calls to
** [sqlite3_step()].
**
** {F12912} 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. <todo>What if N is less than 1?</todo>
**
** {F12913} The progress callback itself is identified by the third
** argument to [sqlite3_progress_handler()].
**
** {F12914} The fourth argument [sqlite3_progress_handler()] is a
*** void pointer passed to the progress callback
** function each time it is invoked.
**
** {F12915} If a call to [sqlite3_step()] results in fewer than
** N opcodes being executed,
** then the progress callback is never invoked. {END}
**
** {F12916} Every call to [sqlite3_progress_handler()]
** overwrites any previously registere progress handler.
**
** {F12917} If the progress handler callback is NULL then no progress
** handler is invoked.
**
** {F12918} 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}
**
** 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()].
** An [sqlite3*] handle is usually returned in *ppDb, even
** if an error occurs. The only exception is 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.
**
** 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 [sqlite3*] 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 acccepts two additional parameters for additional control
** over the new database connection. The flags parameter can be
** one of:
**
** <ol>
** <li> [SQLITE_OPEN_READONLY]
** <li> [SQLITE_OPEN_READWRITE]
** <li> [SQLITE_OPEN_READWRITE] | [SQLITE_OPEN_CREATE]
** </ol>
**
** The first value opens the database read-only.
** If the database does not previously exist, an error is returned.
** The second option opens
** the database for reading and writing if possible, or reading only if
** if the file is write protected. In either case the database
** must already exist or an error is returned. The third option
** opens the database for reading and writing and creates it if it does
** not already exist.
** The third options is behavior that is always used for [sqlite3_open()]
** and [sqlite3_open16()].
**
** If the 4th parameter to [sqlite3_open_v2()] is not one of the
** combinations shown above then the behavior is undefined.
**
** If the filename is ":memory:", then an private
** in-memory database is created for the connection. This in-memory
** database will vanish when the database connection is closed. 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.
**
** 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.
**
** 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
** 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()].
**
** INVARIANTS:
**
** {F12701} 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.
**
** {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} A successful invocation of [sqlite3_open()], [sqlite3_open16()],
** or [sqlite3_open_v2()] writes a pointer to a new
** [database connection] into *ppDb.
**
** {F12704} The [sqlite3_open()], [sqlite3_open16()], and
** [sqlite3_open_v2()] interfaces return [SQLITE_OK] upon success,
** or an appropriate [error code] on failure.
**
** {F12706} The default text encoding for a new database created using
** [sqlite3_open()] or [sqlite3_open_v2()] will be UTF-8.
**
** {F12707} The default text encoding for a new database created using
** [sqlite3_open16()] will be UTF-16.
**
** {F12709} 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].
**
** {F12711} 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.
**
** {F12712} 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.
**
** {F12713} 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.
**
** {F12714} 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.
**
** {F12717} 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.
** <todo>Is SQLITE_OPEN_CREATE|SQLITE_OPEN_READWRITE required
** in sqlite3_open_v2()?</todo>
**
** {F12719} If the filename is NULL or an empty string, then a private,
** ephermeral on-disk database will be created.
** <todo>Is SQLITE_OPEN_CREATE|SQLITE_OPEN_READWRITE required
** in sqlite3_open_v2()?</todo>
**
** {F12721} 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 is V is a NULL pointer.
*/
int sqlite3_open(
const char *filename, /* Database filename (UTF-8) */
sqlite3 **ppDb /* OUT: SQLite db handle */
);
int sqlite3_open16(
const void *filename, /* Database filename (UTF-16) */
sqlite3 **ppDb /* OUT: SQLite db handle */
);
int sqlite3_open_v2(
const char *filename, /* Database filename (UTF-8) */
sqlite3 **ppDb, /* OUT: SQLite db handle */
int flags, /* Flags */
const char *zVfs /* Name of VFS module to use */
);
/*
** CAPI3REF: Error Codes And Messages {F12800}
**
** 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'. 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 UTF8 or UTF16 respectively.
** Memory to hold the error message string is managed internally.
** The application does not need to worry with freeing the result.
** However, the error string might be overwritten or deallocated by
** subsequent calls to other SQLite interface functions.
**
** INVARIANTS:
**
** {F12801} The [sqlite3_errcode(D)] interface returns the numeric
** [SQLITE_OK | result code] or
** [SQLITE_IOERR_READ | extended result code]
** for the most recently failed interface call associated
** with [database connection] D.
**
** {F12803} 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 UTF8 or UTF16 respectively.
**
** {F12807} The strings returned by [sqlite3_errmsg()] and [sqlite3_errmsg16()]
** are valid until the next SQLite interface call.
**
** {F12808} 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()].
**
** {F12809} 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}
** 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
** "compiled SQL statement" or simply as a "statement".
**
** The life of a statement object goes something like this:
**
** <ol>
** <li> Create the object using [sqlite3_prepare_v2()] or a related
** function.
** <li> Bind values to host parameters using
** [sqlite3_bind_blob | sqlite3_bind_* interfaces].
** <li> Run the SQL by calling [sqlite3_step()] one or more times.
** <li> Reset the statement using [sqlite3_reset()] then go back
** to step 2. Do this zero or more times.
** <li> Destroy the object using [sqlite3_finalize()].
** </ol>
**
** Refer to documentation on individual methods above for additional
** information.
*/
typedef struct sqlite3_stmt sqlite3_stmt;
/*
** CAPI3REF: Run-time Limits {F12760}
**
** 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-preprocess 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
** attach. 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].
**
** This interface is currently considered experimental and is subject
** to change or removal without prior notice.
**
** INVARIANTS:
**
** {F12762} A successful call to [sqlite3_limit(D,C,V)] where V is
** positive changes the
** limit on the size of construct C in [database connection] D
** to the lessor of V and the hard upper bound on the size
** of C that is set at compile-time.
**
** {F12764} A successful call to [sqlite3_limit(D,C,V)] where V is zero
** changes the limit on the size of construct C in
** [database connection] D to be the hard upper bound on the size
** of C that is set at compile-time.
**
** {F12766} A successful call to [sqlite3_limit(D,C,V)] where V is negative
** leaves the state of [database connection] D unchanged.
**
** {F12769} A successful call to [sqlite3_limit(D,C,V)] returns the
** value of the limit on the size of construct C in
** in [database connection] D as it was prior to the call.
*/
int sqlite3_limit(sqlite3*, int id, int newVal);
/*
** CAPI3REF: Run-Time Limit Categories {F12790}
** 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:
**
** <dl>
** <dt>SQLITE_LIMIT_LENGTH</dt>
** <dd>The maximum size of any
** string or blob or table row.<dd>
**
** <dt>SQLITE_LIMIT_SQL_LENGTH</dt>
** <dd>The maximum length of an SQL statement.</dd>
**
** <dt>SQLITE_LIMIT_COLUMN</dt>
** <dd>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.</dd>
**
** <dt>SQLITE_LIMIT_EXPR_DEPTH</dt>
** <dd>The maximum depth of the parse tree on any expression.</dd>
**
** <dt>SQLITE_LIMIT_COMPOUND_SELECT</dt>
** <dd>The maximum number of terms in a compound SELECT statement.</dd>
**
** <dt>SQLITE_LIMIT_VDBE_OP</dt>
** <dd>The maximum number of instructions in a virtual machine program
** used to implement an SQL statement.</dd>
**
** <dt>SQLITE_LIMIT_FUNCTION_ARG</dt>
** <dd>The maximum number of arguments on a function.</dd>
**
** <dt>SQLITE_LIMIT_ATTACHED</dt>
** <dd>The maximum number of attached databases.</dd>
**
** <dt>SQLITE_LIMIT_LIKE_PATTERN_LENGTH</dt>
** <dd>The maximum length of the pattern argument to the LIKE or
** GLOB operators.</dd>
**
** <dt>SQLITE_LIMIT_VARIABLE_NUMBER</dt>
** <dd>The maximum number of variables in an SQL statement that can
** be bound.</dd>
** </dl>
*/
#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 {F13010}
**
** To execute an SQL query, it must first be compiled into a byte-code
** program using one of these routines.
**
** The first argument "db" is an [database connection]
** obtained from a prior call to [sqlite3_open()], [sqlite3_open_v2()]
** or [sqlite3_open16()].
** 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}
**
** 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 '00' 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 had by passing an nByte parameter that
** is equal to the number of bytes in the input string including
** the nul-terminator bytes.{END}
**
** *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
** statement in zSql, so *pzTail is left pointing to what remains
** uncompiled.
**
** *ppStmt is left pointing to a compiled [prepared statement] that can be
** executed using [sqlite3_step()]. Or if there is an error, *ppStmt is
** set to NULL. 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.
**
** 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.
** 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
** behave a differently in two ways:
**
** <ol>
** <li>
** 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. If the schema has changed in
** a way that makes the statement no longer valid, [sqlite3_step()] will still
** 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. {END}
** </li>
**
** <li>
** 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.
** </li>
** </ol>
**
** INVARIANTS:
**
** {F13011} The [sqlite3_prepare(db,zSql,...)] and
** [sqlite3_prepare_v2(db,zSql,...)] interfaces interpret the
** text in their zSql parameter as UTF-8.
**
** {F13012} 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.
**
** {F13013} If the nByte argument to [sqlite3_prepare_v2(db,zSql,nByte,...)]
** and its variants is less than zero, then SQL text is
** read from zSql is read up to the first zero terminator.
**
** {F13014} If the nByte argument to [sqlite3_prepare_v2(db,zSql,nByte,...)]
** and its variants is non-negative, then at most nBytes bytes
** SQL text is read from zSql.
**
** {F13015} 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.
** <todo>What does *pzTail point to if there is one statement?</todo>
**
** {F13016} 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.
**
** {F13019} The [sqlite3_prepare_v2()] interface and its variants return
** [SQLITE_OK] or an appropriate [error code] upon failure.
**
** {F13021} Before [sqlite3_prepare(db,zSql,nByte,ppStmt,pzTail)] or its
** variants returns an error (any value other than [SQLITE_OK])
** it first sets *ppStmt to NULL.
*/
int sqlite3_prepare(
sqlite3 *db, /* Database handle */
const char *zSql, /* SQL statement, UTF-8 encoded */
int nByte, /* Maximum length of zSql in bytes. */
sqlite3_stmt **ppStmt, /* OUT: Statement handle */
const char **pzTail /* OUT: Pointer to unused portion of zSql */
);
int sqlite3_prepare_v2(
sqlite3 *db, /* Database handle */
const char *zSql, /* SQL statement, UTF-8 encoded */
int nByte, /* Maximum length of zSql in bytes. */
sqlite3_stmt **ppStmt, /* OUT: Statement handle */
const char **pzTail /* OUT: Pointer to unused portion of zSql */
);
int sqlite3_prepare16(
sqlite3 *db, /* Database handle */
const void *zSql, /* SQL statement, UTF-16 encoded */
int nByte, /* Maximum length of zSql in bytes. */
sqlite3_stmt **ppStmt, /* OUT: Statement handle */
const void **pzTail /* OUT: Pointer to unused portion of zSql */
);
int sqlite3_prepare16_v2(
sqlite3 *db, /* Database handle */
const void *zSql, /* SQL statement, UTF-16 encoded */
int nByte, /* Maximum length of zSql in bytes. */
sqlite3_stmt **ppStmt, /* OUT: Statement handle */
const void **pzTail /* OUT: Pointer to unused portion of zSql */
);
/*
** CAPIREF: Retrieving Statement SQL {F13100}
**
** This intereface can be used to retrieve a saved copy of the original
** SQL text used to create a [prepared statement].
**
** INVARIANTS:
**
** {F13101} If the [prepared statement] passed as
** the an argument to [sqlite3_sql()] was compiled
** compiled using either [sqlite3_prepare_v2()] or
** [sqlite3_prepare16_v2()],
** then [sqlite3_sql()] function returns a pointer to a
** zero-terminated string containing a UTF-8 rendering
** of the original SQL statement.
**
** {F13102} If the [prepared statement] passed as
** the an argument to [sqlite3_sql()] was compiled
** compiled using either [sqlite3_prepare()] or
** [sqlite3_prepare16()],
** then [sqlite3_sql()] function returns a NULL pointer.
**
** {F13103} 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}
** 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
** 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)
** then there is no distinction between
** protected and unprotected sqlite3_value objects and they can be
** used interchangable. However, for maximum code portability it
** is recommended that applications make the distinction between
** between protected and unprotected sqlite3_value objects even if
** they are single threaded.
**
** 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()]. All other
** interfaces that use sqlite3_value require protected sqlite3_value objects.
*/
typedef struct Mem sqlite3_value;
/*
** CAPI3REF: SQL Function Context Object {F16001}
**
** The context in which an SQL function executes is stored in an
** sqlite3_context object. A pointer to an sqlite3_context
** object is always first parameter to application-defined SQL functions.
*/
typedef struct sqlite3_context sqlite3_context;
/*
** CAPI3REF: Binding Values To Prepared Statements {F13500}
**
** In the SQL strings input to [sqlite3_prepare_v2()] and its
** variants, literals may be replace by a parameter in one
** of these forms:
**
** <ul>
** <li> ?
** <li> ?NNN
** <li> :VVV
** <li> @VVV
** <li> $VVV
** </ul>
**
** In the parameter forms shown above NNN is an integer literal,
** VVV 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.
**
** 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. The second
** argument is the index of the parameter to be set. The
** first parameter has an index of 1. When the same named
** 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_name()] API if desired. The index
** for "?NNN" parameters is the value of NNN.
** The NNN value must be between 1 and the compile-time
** parameter SQLITE_MAX_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.
**
** The fifth argument to sqlite3_bind_blob(), sqlite3_bind_text(), and
** sqlite3_bind_text16() is a destructor used to dispose of the BLOB or
** 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.
** 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.
**
** The sqlite3_bind_zeroblob() routine binds a BLOB of length N that
** is filled with zeros. A zeroblob uses a fixed amount of memory
** (just an integer to hold it size) while it is being processed.
** Zeroblobs are intended to serve as place-holders for BLOBs whose
** content is later written using
** [sqlite3_blob_open | increment BLOB I/O] routines. A negative
** value for the zeroblob results in a zero-length BLOB.
**
** The sqlite3_bind_*() routines must be called after
** [sqlite3_prepare_v2()] (and its variants) or [sqlite3_reset()] and
** before [sqlite3_step()].
** Bindings are not cleared by the [sqlite3_reset()] routine.
** Unbound parameters are interpreted as NULL.
**
** 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:
**
** {F13506} The [sqlite3_prepare | 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.
**
** {F13509} The initial value of an SQL parameter is NULL.
**
** {F13512} 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.
**
** {F13515} The index of an "?NNN" SQL parameter is the integer NNN.
**
** {F13518} The index of an ":VVV", "$VVV", or "@VVV" SQL parameter is
** the same as the index of leftmost occurances of the same
** parameter, or one more than the largest index over all
** parameters to the left if this is the first occurrance
** of this parameter, or 1 if this is the leftmost parameter.
**
** {F13521} The [sqlite3_prepare | SQL statement compiler] fail with
** an [SQLITE_RANGE] error if the index of an SQL parameter
** is less than 1 or greater than SQLITE_MAX_VARIABLE_NUMBER.
**
** {F13524} 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.
**
** {F13527} Calls to [sqlite3_bind_text | sqlite3_bind(S,N,...)]
** override prior calls with the same values of S and N.
**
** {F13530} Bindings established by [sqlite3_bind_text | sqlite3_bind(S,...)]
** persist across calls to [sqlite3_reset(S)].
**
** {F13533} 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.
**
** {F13536} 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.
**
** {F13539} 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.
**
** {F13542} 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 V value before it returns.
**
** {F13545} 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
** V value after it has finished using the V value.
**
** {F13548} 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.
**
** {F13551} 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);
int sqlite3_bind_int(sqlite3_stmt*, int, int);
int sqlite3_bind_int64(sqlite3_stmt*, int, sqlite3_int64);
int sqlite3_bind_null(sqlite3_stmt*, int);
int sqlite3_bind_text(sqlite3_stmt*, int, const char*, int n, void(*)(void*));
int sqlite3_bind_text16(sqlite3_stmt*, int, const void*, int, void(*)(void*));
int sqlite3_bind_value(sqlite3_stmt*, int, const sqlite3_value*);
int sqlite3_bind_zeroblob(sqlite3_stmt*, int, int n);
/*
** CAPI3REF: Number Of SQL Parameters {F13600}
**
** 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
** place-holders for values that are [sqlite3_bind_blob | bound]
** to the parameters at a later time.
**
** This routine actually returns the index of the largest 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:
**
** {F13601} 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}
**
** This routine returns a pointer to the name of the n-th
** SQL parameter in a [prepared statement].
** SQL parameters of the form ":AAA" or "@AAA" or "$AAA" have a name
** which is the string ":AAA" or "@AAA" or "$VVV".
** In other words, the initial ":" or "$" or "@"
** is included as part of the name.
** Parameters of the form "?" or "?NNN" have no name.
**
** 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 the UTF-8 encoding even if the named parameter was
** originally specified as UTF-16 in [sqlite3_prepare16()] or
** [sqlite3_prepare16_v2()].
**
** See also: [sqlite3_bind_blob|sqlite3_bind()],
** [sqlite3_bind_parameter_count()], and
** [sqlite3_bind_parameter_index()].
**
** INVARIANTS:
**
** {F13621} The [sqlite3_bind_parameter_name(S,N)] interface returns
** a UTF-8 rendering of the name of the SQL parameter in
** [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 "?" or
** a numbered parameter "?NNN".
*/
const char *sqlite3_bind_parameter_name(sqlite3_stmt*, int);
/*
** CAPI3REF: Index Of A Parameter With A Given Name {F13640}
**
** 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()].
**
** See also: [sqlite3_bind_blob|sqlite3_bind()],
** [sqlite3_bind_parameter_count()], and
** [sqlite3_bind_parameter_index()].
**
** INVARIANTS:
**
** {F13641} The [sqlite3_bind_parameter_index(S,N)] interface returns
** the index of SQL parameter in [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}
**
** 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.
**
** INVARIANTS:
**
** {F13661} The [sqlite3_clear_bindings(S)] interface resets all
** SQL parameter bindings in [prepared statement] S
** back to NULL.
*/
int sqlite3_clear_bindings(sqlite3_stmt*);
/*
** CAPI3REF: Number Of Columns In A Result Set {F13710}
**
** 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).
**
** INVARIANTS:
**
** {F13711} 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}
**
** 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 UTF8 string
** and sqlite3_column_name16() returns a pointer to a zero-terminated
** UTF16 string. The first parameter is the
** [prepared statement] that implements the SELECT statement.
** The second parameter is the column number. The left-most 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 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:
**
** {F13721} A successful invocation of the [sqlite3_column_name(S,N)]
** interface returns the name
** of the Nth column (where 0 is the left-most column) for the
** result set of [prepared statement] S as a
** zero-terminated UTF-8 string.
**
** {F13723} A successful invocation of the [sqlite3_column_name16(S,N)]
** interface returns the name
** of the Nth column (where 0 is the left-most column) for the
** result set of [prepared statement] S as a
** zero-terminated UTF-16 string in the native byte order.
**
** {F13724} The [sqlite3_column_name()] and [sqlite3_column_name16()]
** interfaces return a NULL pointer if they are unable to
** allocate memory memory to hold there normal return strings.
**
** {F13725} If the N parameter to [sqlite3_column_name(S,N)] or
** [sqlite3_column_name16(S,N)] is out of range, then the
** interfaces returns a NULL pointer.
**
** {F13726} 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