4 ** The author disclaims copyright to this source code. In place of
5 ** a legal notice, here is a blessing:
7 ** May you do good and not evil.
8 ** May you find forgiveness for yourself and forgive others.
9 ** May you share freely, never taking more than you give.
11 *************************************************************************
12 ** Main file for the SQLite library. The routines in this file
13 ** implement the programmer interface to the library. Routines in
14 ** other files are for internal use by SQLite and should not be
15 ** accessed by users of the library.
17 #include "sqliteInt.h"
19 #ifdef SQLITE_ENABLE_FTS3
22 #ifdef SQLITE_ENABLE_RTREE
25 #ifdef SQLITE_ENABLE_ICU
26 # include "sqliteicu.h"
29 #ifndef SQLITE_AMALGAMATION
30 /* IMPLEMENTATION-OF: R-46656-45156 The sqlite3_version[] string constant
31 ** contains the text of SQLITE_VERSION macro.
33 const char sqlite3_version[] = SQLITE_VERSION;
36 /* IMPLEMENTATION-OF: R-53536-42575 The sqlite3_libversion() function returns
37 ** a pointer to the to the sqlite3_version[] string constant.
39 const char *sqlite3_libversion(void){ return sqlite3_version; }
41 /* IMPLEMENTATION-OF: R-63124-39300 The sqlite3_sourceid() function returns a
42 ** pointer to a string constant whose value is the same as the
43 ** SQLITE_SOURCE_ID C preprocessor macro.
45 const char *sqlite3_sourceid(void){ return SQLITE_SOURCE_ID; }
47 /* IMPLEMENTATION-OF: R-35210-63508 The sqlite3_libversion_number() function
48 ** returns an integer equal to SQLITE_VERSION_NUMBER.
50 int sqlite3_libversion_number(void){ return SQLITE_VERSION_NUMBER; }
52 /* IMPLEMENTATION-OF: R-54823-41343 The sqlite3_threadsafe() function returns
53 ** zero if and only if SQLite was compiled mutexing code omitted due to
54 ** the SQLITE_THREADSAFE compile-time option being set to 0.
56 int sqlite3_threadsafe(void){ return SQLITE_THREADSAFE; }
58 #if !defined(SQLITE_OMIT_TRACE) && defined(SQLITE_ENABLE_IOTRACE)
60 ** If the following function pointer is not NULL and if
61 ** SQLITE_ENABLE_IOTRACE is enabled, then messages describing
62 ** I/O active are written using this function. These messages
63 ** are intended for debugging activity only.
65 void (*sqlite3IoTrace)(const char*, ...) = 0;
69 ** If the following global variable points to a string which is the
70 ** name of a directory, then that directory will be used to store
73 ** See also the "PRAGMA temp_store_directory" SQL command.
75 char *sqlite3_temp_directory = 0;
80 ** This routine must be called to initialize the memory allocation,
81 ** VFS, and mutex subsystems prior to doing any serious work with
82 ** SQLite. But as long as you do not compile with SQLITE_OMIT_AUTOINIT
83 ** this routine will be called automatically by key routines such as
86 ** This routine is a no-op except on its very first call for the process,
87 ** or for the first call after a call to sqlite3_shutdown.
89 ** The first thread to call this routine runs the initialization to
90 ** completion. If subsequent threads call this routine before the first
91 ** thread has finished the initialization process, then the subsequent
92 ** threads must block until the first thread finishes with the initialization.
94 ** The first thread might call this routine recursively. Recursive
95 ** calls to this routine should not block, of course. Otherwise the
96 ** initialization process would never complete.
98 ** Let X be the first thread to enter this routine. Let Y be some other
99 ** thread. Then while the initial invocation of this routine by X is
100 ** incomplete, it is required that:
102 ** * Calls to this routine from Y must block until the outer-most
103 ** call by X completes.
105 ** * Recursive calls to this routine from thread X return immediately
108 int sqlite3_initialize(void){
109 sqlite3_mutex *pMaster; /* The main static mutex */
110 int rc; /* Result code */
112 #ifdef SQLITE_OMIT_WSD
113 rc = sqlite3_wsd_init(4096, 24);
119 /* If SQLite is already completely initialized, then this call
120 ** to sqlite3_initialize() should be a no-op. But the initialization
121 ** must be complete. So isInit must not be set until the very end
124 if( sqlite3GlobalConfig.isInit ) return SQLITE_OK;
126 /* Make sure the mutex subsystem is initialized. If unable to
127 ** initialize the mutex subsystem, return early with the error.
128 ** If the system is so sick that we are unable to allocate a mutex,
129 ** there is not much SQLite is going to be able to do.
131 ** The mutex subsystem must take care of serializing its own
134 rc = sqlite3MutexInit();
137 /* Initialize the malloc() system and the recursive pInitMutex mutex.
138 ** This operation is protected by the STATIC_MASTER mutex. Note that
139 ** MutexAlloc() is called for a static mutex prior to initializing the
140 ** malloc subsystem - this implies that the allocation of a static
141 ** mutex must not require support from the malloc subsystem.
143 pMaster = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MASTER);
144 sqlite3_mutex_enter(pMaster);
145 sqlite3GlobalConfig.isMutexInit = 1;
146 if( !sqlite3GlobalConfig.isMallocInit ){
147 rc = sqlite3MallocInit();
150 sqlite3GlobalConfig.isMallocInit = 1;
151 if( !sqlite3GlobalConfig.pInitMutex ){
152 sqlite3GlobalConfig.pInitMutex =
153 sqlite3MutexAlloc(SQLITE_MUTEX_RECURSIVE);
154 if( sqlite3GlobalConfig.bCoreMutex && !sqlite3GlobalConfig.pInitMutex ){
160 sqlite3GlobalConfig.nRefInitMutex++;
162 sqlite3_mutex_leave(pMaster);
164 /* If rc is not SQLITE_OK at this point, then either the malloc
165 ** subsystem could not be initialized or the system failed to allocate
166 ** the pInitMutex mutex. Return an error in either case. */
171 /* Do the rest of the initialization under the recursive mutex so
172 ** that we will be able to handle recursive calls into
173 ** sqlite3_initialize(). The recursive calls normally come through
174 ** sqlite3_os_init() when it invokes sqlite3_vfs_register(), but other
175 ** recursive calls might also be possible.
177 ** IMPLEMENTATION-OF: R-00140-37445 SQLite automatically serializes calls
178 ** to the xInit method, so the xInit method need not be threadsafe.
180 ** The following mutex is what serializes access to the appdef pcache xInit
181 ** methods. The sqlite3_pcache_methods.xInit() all is embedded in the
182 ** call to sqlite3PcacheInitialize().
184 sqlite3_mutex_enter(sqlite3GlobalConfig.pInitMutex);
185 if( sqlite3GlobalConfig.isInit==0 && sqlite3GlobalConfig.inProgress==0 ){
186 FuncDefHash *pHash = &GLOBAL(FuncDefHash, sqlite3GlobalFunctions);
187 sqlite3GlobalConfig.inProgress = 1;
188 memset(pHash, 0, sizeof(sqlite3GlobalFunctions));
189 sqlite3RegisterGlobalFunctions();
190 if( sqlite3GlobalConfig.isPCacheInit==0 ){
191 rc = sqlite3PcacheInitialize();
194 sqlite3GlobalConfig.isPCacheInit = 1;
195 rc = sqlite3OsInit();
198 sqlite3PCacheBufferSetup( sqlite3GlobalConfig.pPage,
199 sqlite3GlobalConfig.szPage, sqlite3GlobalConfig.nPage);
200 sqlite3GlobalConfig.isInit = 1;
202 sqlite3GlobalConfig.inProgress = 0;
204 sqlite3_mutex_leave(sqlite3GlobalConfig.pInitMutex);
206 /* Go back under the static mutex and clean up the recursive
207 ** mutex to prevent a resource leak.
209 sqlite3_mutex_enter(pMaster);
210 sqlite3GlobalConfig.nRefInitMutex--;
211 if( sqlite3GlobalConfig.nRefInitMutex<=0 ){
212 assert( sqlite3GlobalConfig.nRefInitMutex==0 );
213 sqlite3_mutex_free(sqlite3GlobalConfig.pInitMutex);
214 sqlite3GlobalConfig.pInitMutex = 0;
216 sqlite3_mutex_leave(pMaster);
218 /* The following is just a sanity check to make sure SQLite has
219 ** been compiled correctly. It is important to run this code, but
220 ** we don't want to run it too often and soak up CPU cycles for no
221 ** reason. So we run it once during initialization.
224 #ifndef SQLITE_OMIT_FLOATING_POINT
225 /* This section of code's only "output" is via assert() statements. */
226 if ( rc==SQLITE_OK ){
227 u64 x = (((u64)1)<<63)-1;
229 assert(sizeof(x)==8);
230 assert(sizeof(x)==sizeof(y));
232 assert( sqlite3IsNaN(y) );
241 ** Undo the effects of sqlite3_initialize(). Must not be called while
242 ** there are outstanding database connections or memory allocations or
243 ** while any part of SQLite is otherwise in use in any thread. This
244 ** routine is not threadsafe. But it is safe to invoke this routine
245 ** on when SQLite is already shut down. If SQLite is already shut down
246 ** when this routine is invoked, then this routine is a harmless no-op.
248 int sqlite3_shutdown(void){
249 if( sqlite3GlobalConfig.isInit ){
251 sqlite3_reset_auto_extension();
252 sqlite3GlobalConfig.isInit = 0;
254 if( sqlite3GlobalConfig.isPCacheInit ){
255 sqlite3PcacheShutdown();
256 sqlite3GlobalConfig.isPCacheInit = 0;
258 if( sqlite3GlobalConfig.isMallocInit ){
260 sqlite3GlobalConfig.isMallocInit = 0;
262 if( sqlite3GlobalConfig.isMutexInit ){
264 sqlite3GlobalConfig.isMutexInit = 0;
271 ** This API allows applications to modify the global configuration of
272 ** the SQLite library at run-time.
274 ** This routine should only be called when there are no outstanding
275 ** database connections or memory allocations. This routine is not
276 ** threadsafe. Failure to heed these warnings can lead to unpredictable
279 int sqlite3_config(int op, ...){
283 /* sqlite3_config() shall return SQLITE_MISUSE if it is invoked while
284 ** the SQLite library is in use. */
285 if( sqlite3GlobalConfig.isInit ) return SQLITE_MISUSE_BKPT;
290 /* Mutex configuration options are only available in a threadsafe
293 #if defined(SQLITE_THREADSAFE) && SQLITE_THREADSAFE>0
294 case SQLITE_CONFIG_SINGLETHREAD: {
295 /* Disable all mutexing */
296 sqlite3GlobalConfig.bCoreMutex = 0;
297 sqlite3GlobalConfig.bFullMutex = 0;
300 case SQLITE_CONFIG_MULTITHREAD: {
301 /* Disable mutexing of database connections */
302 /* Enable mutexing of core data structures */
303 sqlite3GlobalConfig.bCoreMutex = 1;
304 sqlite3GlobalConfig.bFullMutex = 0;
307 case SQLITE_CONFIG_SERIALIZED: {
308 /* Enable all mutexing */
309 sqlite3GlobalConfig.bCoreMutex = 1;
310 sqlite3GlobalConfig.bFullMutex = 1;
313 case SQLITE_CONFIG_MUTEX: {
314 /* Specify an alternative mutex implementation */
315 sqlite3GlobalConfig.mutex = *va_arg(ap, sqlite3_mutex_methods*);
318 case SQLITE_CONFIG_GETMUTEX: {
319 /* Retrieve the current mutex implementation */
320 *va_arg(ap, sqlite3_mutex_methods*) = sqlite3GlobalConfig.mutex;
326 case SQLITE_CONFIG_MALLOC: {
327 /* Specify an alternative malloc implementation */
328 sqlite3GlobalConfig.m = *va_arg(ap, sqlite3_mem_methods*);
331 case SQLITE_CONFIG_GETMALLOC: {
332 /* Retrieve the current malloc() implementation */
333 if( sqlite3GlobalConfig.m.xMalloc==0 ) sqlite3MemSetDefault();
334 *va_arg(ap, sqlite3_mem_methods*) = sqlite3GlobalConfig.m;
337 case SQLITE_CONFIG_MEMSTATUS: {
338 /* Enable or disable the malloc status collection */
339 sqlite3GlobalConfig.bMemstat = va_arg(ap, int);
342 case SQLITE_CONFIG_SCRATCH: {
343 /* Designate a buffer for scratch memory space */
344 sqlite3GlobalConfig.pScratch = va_arg(ap, void*);
345 sqlite3GlobalConfig.szScratch = va_arg(ap, int);
346 sqlite3GlobalConfig.nScratch = va_arg(ap, int);
349 case SQLITE_CONFIG_PAGECACHE: {
350 /* Designate a buffer for page cache memory space */
351 sqlite3GlobalConfig.pPage = va_arg(ap, void*);
352 sqlite3GlobalConfig.szPage = va_arg(ap, int);
353 sqlite3GlobalConfig.nPage = va_arg(ap, int);
357 case SQLITE_CONFIG_PCACHE: {
358 /* Specify an alternative page cache implementation */
359 sqlite3GlobalConfig.pcache = *va_arg(ap, sqlite3_pcache_methods*);
363 case SQLITE_CONFIG_GETPCACHE: {
364 if( sqlite3GlobalConfig.pcache.xInit==0 ){
365 sqlite3PCacheSetDefault();
367 *va_arg(ap, sqlite3_pcache_methods*) = sqlite3GlobalConfig.pcache;
371 #if defined(SQLITE_ENABLE_MEMSYS3) || defined(SQLITE_ENABLE_MEMSYS5)
372 case SQLITE_CONFIG_HEAP: {
373 /* Designate a buffer for heap memory space */
374 sqlite3GlobalConfig.pHeap = va_arg(ap, void*);
375 sqlite3GlobalConfig.nHeap = va_arg(ap, int);
376 sqlite3GlobalConfig.mnReq = va_arg(ap, int);
378 if( sqlite3GlobalConfig.mnReq<1 ){
379 sqlite3GlobalConfig.mnReq = 1;
380 }else if( sqlite3GlobalConfig.mnReq>(1<<12) ){
381 /* cap min request size at 2^12 */
382 sqlite3GlobalConfig.mnReq = (1<<12);
385 if( sqlite3GlobalConfig.pHeap==0 ){
386 /* If the heap pointer is NULL, then restore the malloc implementation
387 ** back to NULL pointers too. This will cause the malloc to go
388 ** back to its default implementation when sqlite3_initialize() is
391 memset(&sqlite3GlobalConfig.m, 0, sizeof(sqlite3GlobalConfig.m));
393 /* The heap pointer is not NULL, then install one of the
394 ** mem5.c/mem3.c methods. If neither ENABLE_MEMSYS3 nor
395 ** ENABLE_MEMSYS5 is defined, return an error.
397 #ifdef SQLITE_ENABLE_MEMSYS3
398 sqlite3GlobalConfig.m = *sqlite3MemGetMemsys3();
400 #ifdef SQLITE_ENABLE_MEMSYS5
401 sqlite3GlobalConfig.m = *sqlite3MemGetMemsys5();
408 case SQLITE_CONFIG_LOOKASIDE: {
409 sqlite3GlobalConfig.szLookaside = va_arg(ap, int);
410 sqlite3GlobalConfig.nLookaside = va_arg(ap, int);
414 /* Record a pointer to the logger funcction and its first argument.
415 ** The default is NULL. Logging is disabled if the function pointer is
418 case SQLITE_CONFIG_LOG: {
419 /* MSVC is picky about pulling func ptrs from va lists.
420 ** http://support.microsoft.com/kb/47961
421 ** sqlite3GlobalConfig.xLog = va_arg(ap, void(*)(void*,int,const char*));
423 typedef void(*LOGFUNC_t)(void*,int,const char*);
424 sqlite3GlobalConfig.xLog = va_arg(ap, LOGFUNC_t);
425 sqlite3GlobalConfig.pLogArg = va_arg(ap, void*);
439 ** Set up the lookaside buffers for a database connection.
440 ** Return SQLITE_OK on success.
441 ** If lookaside is already active, return SQLITE_BUSY.
443 ** The sz parameter is the number of bytes in each lookaside slot.
444 ** The cnt parameter is the number of slots. If pStart is NULL the
445 ** space for the lookaside memory is obtained from sqlite3_malloc().
446 ** If pStart is not NULL then it is sz*cnt bytes of memory to use for
447 ** the lookaside memory.
449 static int setupLookaside(sqlite3 *db, void *pBuf, int sz, int cnt){
451 if( db->lookaside.nOut ){
454 /* Free any existing lookaside buffer for this handle before
455 ** allocating a new one so we don't have to have space for
456 ** both at the same time.
458 if( db->lookaside.bMalloced ){
459 sqlite3_free(db->lookaside.pStart);
461 /* The size of a lookaside slot needs to be larger than a pointer
464 if( sz<=(int)sizeof(LookasideSlot*) ) sz = 0;
466 if( sz==0 || cnt==0 ){
470 sz = ROUNDDOWN8(sz); /* IMP: R-33038-09382 */
471 sqlite3BeginBenignMalloc();
472 pStart = sqlite3Malloc( sz*cnt ); /* IMP: R-61949-35727 */
473 sqlite3EndBenignMalloc();
475 sz = ROUNDDOWN8(sz); /* IMP: R-33038-09382 */
478 db->lookaside.pStart = pStart;
479 db->lookaside.pFree = 0;
480 db->lookaside.sz = (u16)sz;
484 assert( sz > (int)sizeof(LookasideSlot*) );
485 p = (LookasideSlot*)pStart;
486 for(i=cnt-1; i>=0; i--){
487 p->pNext = db->lookaside.pFree;
488 db->lookaside.pFree = p;
489 p = (LookasideSlot*)&((u8*)p)[sz];
491 db->lookaside.pEnd = p;
492 db->lookaside.bEnabled = 1;
493 db->lookaside.bMalloced = pBuf==0 ?1:0;
495 db->lookaside.pEnd = 0;
496 db->lookaside.bEnabled = 0;
497 db->lookaside.bMalloced = 0;
503 ** Return the mutex associated with a database connection.
505 sqlite3_mutex *sqlite3_db_mutex(sqlite3 *db){
510 ** Configuration settings for an individual database connection
512 int sqlite3_db_config(sqlite3 *db, int op, ...){
517 case SQLITE_DBCONFIG_LOOKASIDE: {
518 void *pBuf = va_arg(ap, void*); /* IMP: R-26835-10964 */
519 int sz = va_arg(ap, int); /* IMP: R-47871-25994 */
520 int cnt = va_arg(ap, int); /* IMP: R-04460-53386 */
521 rc = setupLookaside(db, pBuf, sz, cnt);
525 static const struct {
526 int op; /* The opcode */
527 u32 mask; /* Mask of the bit in sqlite3.flags to set/clear */
529 { SQLITE_DBCONFIG_ENABLE_FKEY, SQLITE_ForeignKeys },
530 { SQLITE_DBCONFIG_ENABLE_TRIGGER, SQLITE_EnableTrigger },
533 rc = SQLITE_ERROR; /* IMP: R-42790-23372 */
534 for(i=0; i<ArraySize(aFlagOp); i++){
535 if( aFlagOp[i].op==op ){
536 int onoff = va_arg(ap, int);
537 int *pRes = va_arg(ap, int*);
538 int oldFlags = db->flags;
540 db->flags |= aFlagOp[i].mask;
541 }else if( onoff==0 ){
542 db->flags &= ~aFlagOp[i].mask;
544 if( oldFlags!=db->flags ){
545 sqlite3ExpirePreparedStatements(db);
548 *pRes = (db->flags & aFlagOp[i].mask)!=0;
563 ** Return true if the buffer z[0..n-1] contains all spaces.
565 static int allSpaces(const char *z, int n){
566 while( n>0 && z[n-1]==' ' ){ n--; }
571 ** This is the default collating function named "BINARY" which is always
574 ** If the padFlag argument is not NULL then space padding at the end
575 ** of strings is ignored. This implements the RTRIM collation.
577 static int binCollFunc(
579 int nKey1, const void *pKey1,
580 int nKey2, const void *pKey2
583 n = nKey1<nKey2 ? nKey1 : nKey2;
584 rc = memcmp(pKey1, pKey2, n);
587 && allSpaces(((char*)pKey1)+n, nKey1-n)
588 && allSpaces(((char*)pKey2)+n, nKey2-n)
590 /* Leave rc unchanged at 0 */
599 ** Another built-in collating sequence: NOCASE.
601 ** This collating sequence is intended to be used for "case independant
602 ** comparison". SQLite's knowledge of upper and lower case equivalents
603 ** extends only to the 26 characters used in the English language.
605 ** At the moment there is only a UTF-8 implementation.
607 static int nocaseCollatingFunc(
609 int nKey1, const void *pKey1,
610 int nKey2, const void *pKey2
612 int r = sqlite3StrNICmp(
613 (const char *)pKey1, (const char *)pKey2, (nKey1<nKey2)?nKey1:nKey2);
614 UNUSED_PARAMETER(NotUsed);
622 ** Return the ROWID of the most recent insert
624 sqlite_int64 sqlite3_last_insert_rowid(sqlite3 *db){
625 return db->lastRowid;
629 ** Return the number of changes in the most recent call to sqlite3_exec().
631 int sqlite3_changes(sqlite3 *db){
636 ** Return the number of changes since the database handle was opened.
638 int sqlite3_total_changes(sqlite3 *db){
639 return db->nTotalChange;
643 ** Close all open savepoints. This function only manipulates fields of the
644 ** database handle object, it does not close any savepoints that may be open
645 ** at the b-tree/pager level.
647 void sqlite3CloseSavepoints(sqlite3 *db){
648 while( db->pSavepoint ){
649 Savepoint *pTmp = db->pSavepoint;
650 db->pSavepoint = pTmp->pNext;
651 sqlite3DbFree(db, pTmp);
655 db->isTransactionSavepoint = 0;
659 ** Invoke the destructor function associated with FuncDef p, if any. Except,
660 ** if this is not the last copy of the function, do not invoke it. Multiple
661 ** copies of a single function are created when create_function() is called
662 ** with SQLITE_ANY as the encoding.
664 static void functionDestroy(sqlite3 *db, FuncDef *p){
665 FuncDestructor *pDestructor = p->pDestructor;
668 if( pDestructor->nRef==0 ){
669 pDestructor->xDestroy(pDestructor->pUserData);
670 sqlite3DbFree(db, pDestructor);
676 ** Close an existing SQLite database
678 int sqlite3_close(sqlite3 *db){
679 HashElem *i; /* Hash table iterator */
685 if( !sqlite3SafetyCheckSickOrOk(db) ){
686 return SQLITE_MISUSE_BKPT;
688 sqlite3_mutex_enter(db->mutex);
690 /* Force xDestroy calls on all virtual tables */
691 sqlite3ResetInternalSchema(db, -1);
693 /* If a transaction is open, the ResetInternalSchema() call above
694 ** will not have called the xDisconnect() method on any virtual
695 ** tables in the db->aVTrans[] array. The following sqlite3VtabRollback()
696 ** call will do so. We need to do this before the check for active
697 ** SQL statements below, as the v-table implementation may be storing
698 ** some prepared statements internally.
700 sqlite3VtabRollback(db);
702 /* If there are any outstanding VMs, return SQLITE_BUSY. */
704 sqlite3Error(db, SQLITE_BUSY,
705 "unable to close due to unfinalised statements");
706 sqlite3_mutex_leave(db->mutex);
709 assert( sqlite3SafetyCheckSickOrOk(db) );
711 for(j=0; j<db->nDb; j++){
712 Btree *pBt = db->aDb[j].pBt;
713 if( pBt && sqlite3BtreeIsInBackup(pBt) ){
714 sqlite3Error(db, SQLITE_BUSY,
715 "unable to close due to unfinished backup operation");
716 sqlite3_mutex_leave(db->mutex);
721 /* Free any outstanding Savepoint structures. */
722 sqlite3CloseSavepoints(db);
724 for(j=0; j<db->nDb; j++){
725 struct Db *pDb = &db->aDb[j];
727 sqlite3BtreeClose(pDb->pBt);
734 sqlite3ResetInternalSchema(db, -1);
736 /* Tell the code in notify.c that the connection no longer holds any
737 ** locks and does not require any further unlock-notify callbacks.
739 sqlite3ConnectionClosed(db);
741 assert( db->nDb<=2 );
742 assert( db->aDb==db->aDbStatic );
743 for(j=0; j<ArraySize(db->aFunc.a); j++){
744 FuncDef *pNext, *pHash, *p;
745 for(p=db->aFunc.a[j]; p; p=pHash){
748 functionDestroy(db, p);
750 sqlite3DbFree(db, p);
755 for(i=sqliteHashFirst(&db->aCollSeq); i; i=sqliteHashNext(i)){
756 CollSeq *pColl = (CollSeq *)sqliteHashData(i);
757 /* Invoke any destructors registered for collation sequence user data. */
760 pColl[j].xDel(pColl[j].pUser);
763 sqlite3DbFree(db, pColl);
765 sqlite3HashClear(&db->aCollSeq);
766 #ifndef SQLITE_OMIT_VIRTUALTABLE
767 for(i=sqliteHashFirst(&db->aModule); i; i=sqliteHashNext(i)){
768 Module *pMod = (Module *)sqliteHashData(i);
769 if( pMod->xDestroy ){
770 pMod->xDestroy(pMod->pAux);
772 sqlite3DbFree(db, pMod);
774 sqlite3HashClear(&db->aModule);
777 sqlite3Error(db, SQLITE_OK, 0); /* Deallocates any cached error strings. */
779 sqlite3ValueFree(db->pErr);
781 sqlite3CloseExtensions(db);
783 db->magic = SQLITE_MAGIC_ERROR;
785 /* The temp-database schema is allocated differently from the other schema
786 ** objects (using sqliteMalloc() directly, instead of sqlite3BtreeSchema()).
787 ** So it needs to be freed here. Todo: Why not roll the temp schema into
788 ** the same sqliteMalloc() as the one that allocates the database
791 sqlite3DbFree(db, db->aDb[1].pSchema);
792 sqlite3_mutex_leave(db->mutex);
793 db->magic = SQLITE_MAGIC_CLOSED;
794 sqlite3_mutex_free(db->mutex);
795 assert( db->lookaside.nOut==0 ); /* Fails on a lookaside memory leak */
796 if( db->lookaside.bMalloced ){
797 sqlite3_free(db->lookaside.pStart);
804 ** Rollback all database files.
806 void sqlite3RollbackAll(sqlite3 *db){
809 assert( sqlite3_mutex_held(db->mutex) );
810 sqlite3BeginBenignMalloc();
811 for(i=0; i<db->nDb; i++){
812 if( db->aDb[i].pBt ){
813 if( sqlite3BtreeIsInTrans(db->aDb[i].pBt) ){
816 sqlite3BtreeRollback(db->aDb[i].pBt);
817 db->aDb[i].inTrans = 0;
820 sqlite3VtabRollback(db);
821 sqlite3EndBenignMalloc();
823 if( db->flags&SQLITE_InternChanges ){
824 sqlite3ExpirePreparedStatements(db);
825 sqlite3ResetInternalSchema(db, -1);
828 /* Any deferred constraint violations have now been resolved. */
829 db->nDeferredCons = 0;
831 /* If one has been configured, invoke the rollback-hook callback */
832 if( db->xRollbackCallback && (inTrans || !db->autoCommit) ){
833 db->xRollbackCallback(db->pRollbackArg);
838 ** Return a static string that describes the kind of error specified in the
841 const char *sqlite3ErrStr(int rc){
842 static const char* const aMsg[] = {
843 /* SQLITE_OK */ "not an error",
844 /* SQLITE_ERROR */ "SQL logic error or missing database",
845 /* SQLITE_INTERNAL */ 0,
846 /* SQLITE_PERM */ "access permission denied",
847 /* SQLITE_ABORT */ "callback requested query abort",
848 /* SQLITE_BUSY */ "database is locked",
849 /* SQLITE_LOCKED */ "database table is locked",
850 /* SQLITE_NOMEM */ "out of memory",
851 /* SQLITE_READONLY */ "attempt to write a readonly database",
852 /* SQLITE_INTERRUPT */ "interrupted",
853 /* SQLITE_IOERR */ "disk I/O error",
854 /* SQLITE_CORRUPT */ "database disk image is malformed",
855 /* SQLITE_NOTFOUND */ "unknown operation",
856 /* SQLITE_FULL */ "database or disk is full",
857 /* SQLITE_CANTOPEN */ "unable to open database file",
858 /* SQLITE_PROTOCOL */ "locking protocol",
859 /* SQLITE_EMPTY */ "table contains no data",
860 /* SQLITE_SCHEMA */ "database schema has changed",
861 /* SQLITE_TOOBIG */ "string or blob too big",
862 /* SQLITE_CONSTRAINT */ "constraint failed",
863 /* SQLITE_MISMATCH */ "datatype mismatch",
864 /* SQLITE_MISUSE */ "library routine called out of sequence",
865 /* SQLITE_NOLFS */ "large file support is disabled",
866 /* SQLITE_AUTH */ "authorization denied",
867 /* SQLITE_FORMAT */ "auxiliary database format error",
868 /* SQLITE_RANGE */ "bind or column index out of range",
869 /* SQLITE_NOTADB */ "file is encrypted or is not a database",
872 if( ALWAYS(rc>=0) && rc<(int)(sizeof(aMsg)/sizeof(aMsg[0])) && aMsg[rc]!=0 ){
875 return "unknown error";
880 ** This routine implements a busy callback that sleeps and tries
881 ** again until a timeout value is reached. The timeout value is
882 ** an integer number of milliseconds passed in as the first
885 static int sqliteDefaultBusyCallback(
886 void *ptr, /* Database connection */
887 int count /* Number of times table has been busy */
889 #if SQLITE_OS_WIN || (defined(HAVE_USLEEP) && HAVE_USLEEP)
890 static const u8 delays[] =
891 { 1, 2, 5, 10, 15, 20, 25, 25, 25, 50, 50, 100 };
892 static const u8 totals[] =
893 { 0, 1, 3, 8, 18, 33, 53, 78, 103, 128, 178, 228 };
894 # define NDELAY ArraySize(delays)
895 sqlite3 *db = (sqlite3 *)ptr;
896 int timeout = db->busyTimeout;
900 if( count < NDELAY ){
901 delay = delays[count];
902 prior = totals[count];
904 delay = delays[NDELAY-1];
905 prior = totals[NDELAY-1] + delay*(count-(NDELAY-1));
907 if( prior + delay > timeout ){
908 delay = timeout - prior;
909 if( delay<=0 ) return 0;
911 sqlite3OsSleep(db->pVfs, delay*1000);
914 sqlite3 *db = (sqlite3 *)ptr;
915 int timeout = ((sqlite3 *)ptr)->busyTimeout;
916 if( (count+1)*1000 > timeout ){
919 sqlite3OsSleep(db->pVfs, 1000000);
925 ** Invoke the given busy handler.
927 ** This routine is called when an operation failed with a lock.
928 ** If this routine returns non-zero, the lock is retried. If it
929 ** returns 0, the operation aborts with an SQLITE_BUSY error.
931 int sqlite3InvokeBusyHandler(BusyHandler *p){
933 if( NEVER(p==0) || p->xFunc==0 || p->nBusy<0 ) return 0;
934 rc = p->xFunc(p->pArg, p->nBusy);
944 ** This routine sets the busy callback for an Sqlite database to the
945 ** given callback function with the given argument.
947 int sqlite3_busy_handler(
949 int (*xBusy)(void*,int),
952 sqlite3_mutex_enter(db->mutex);
953 db->busyHandler.xFunc = xBusy;
954 db->busyHandler.pArg = pArg;
955 db->busyHandler.nBusy = 0;
956 sqlite3_mutex_leave(db->mutex);
960 #ifndef SQLITE_OMIT_PROGRESS_CALLBACK
962 ** This routine sets the progress callback for an Sqlite database to the
963 ** given callback function with the given argument. The progress callback will
964 ** be invoked every nOps opcodes.
966 void sqlite3_progress_handler(
969 int (*xProgress)(void*),
972 sqlite3_mutex_enter(db->mutex);
974 db->xProgress = xProgress;
975 db->nProgressOps = nOps;
976 db->pProgressArg = pArg;
979 db->nProgressOps = 0;
980 db->pProgressArg = 0;
982 sqlite3_mutex_leave(db->mutex);
988 ** This routine installs a default busy handler that waits for the
989 ** specified number of milliseconds before returning 0.
991 int sqlite3_busy_timeout(sqlite3 *db, int ms){
993 db->busyTimeout = ms;
994 sqlite3_busy_handler(db, sqliteDefaultBusyCallback, (void*)db);
996 sqlite3_busy_handler(db, 0, 0);
1002 ** Cause any pending operation to stop at its earliest opportunity.
1004 void sqlite3_interrupt(sqlite3 *db){
1005 db->u1.isInterrupted = 1;
1010 ** This function is exactly the same as sqlite3_create_function(), except
1011 ** that it is designed to be called by internal code. The difference is
1012 ** that if a malloc() fails in sqlite3_create_function(), an error code
1013 ** is returned and the mallocFailed flag cleared.
1015 int sqlite3CreateFunc(
1017 const char *zFunctionName,
1021 void (*xFunc)(sqlite3_context*,int,sqlite3_value **),
1022 void (*xStep)(sqlite3_context*,int,sqlite3_value **),
1023 void (*xFinal)(sqlite3_context*),
1024 FuncDestructor *pDestructor
1029 assert( sqlite3_mutex_held(db->mutex) );
1030 if( zFunctionName==0 ||
1031 (xFunc && (xFinal || xStep)) ||
1032 (!xFunc && (xFinal && !xStep)) ||
1033 (!xFunc && (!xFinal && xStep)) ||
1034 (nArg<-1 || nArg>SQLITE_MAX_FUNCTION_ARG) ||
1035 (255<(nName = sqlite3Strlen30( zFunctionName))) ){
1036 return SQLITE_MISUSE_BKPT;
1039 #ifndef SQLITE_OMIT_UTF16
1040 /* If SQLITE_UTF16 is specified as the encoding type, transform this
1041 ** to one of SQLITE_UTF16LE or SQLITE_UTF16BE using the
1042 ** SQLITE_UTF16NATIVE macro. SQLITE_UTF16 is not used internally.
1044 ** If SQLITE_ANY is specified, add three versions of the function
1045 ** to the hash table.
1047 if( enc==SQLITE_UTF16 ){
1048 enc = SQLITE_UTF16NATIVE;
1049 }else if( enc==SQLITE_ANY ){
1051 rc = sqlite3CreateFunc(db, zFunctionName, nArg, SQLITE_UTF8,
1052 pUserData, xFunc, xStep, xFinal, pDestructor);
1053 if( rc==SQLITE_OK ){
1054 rc = sqlite3CreateFunc(db, zFunctionName, nArg, SQLITE_UTF16LE,
1055 pUserData, xFunc, xStep, xFinal, pDestructor);
1057 if( rc!=SQLITE_OK ){
1060 enc = SQLITE_UTF16BE;
1066 /* Check if an existing function is being overridden or deleted. If so,
1067 ** and there are active VMs, then return SQLITE_BUSY. If a function
1068 ** is being overridden/deleted but there are no active VMs, allow the
1069 ** operation to continue but invalidate all precompiled statements.
1071 p = sqlite3FindFunction(db, zFunctionName, nName, nArg, (u8)enc, 0);
1072 if( p && p->iPrefEnc==enc && p->nArg==nArg ){
1073 if( db->activeVdbeCnt ){
1074 sqlite3Error(db, SQLITE_BUSY,
1075 "unable to delete/modify user-function due to active statements");
1076 assert( !db->mallocFailed );
1079 sqlite3ExpirePreparedStatements(db);
1083 p = sqlite3FindFunction(db, zFunctionName, nName, nArg, (u8)enc, 1);
1084 assert(p || db->mallocFailed);
1086 return SQLITE_NOMEM;
1089 /* If an older version of the function with a configured destructor is
1090 ** being replaced invoke the destructor function here. */
1091 functionDestroy(db, p);
1094 pDestructor->nRef++;
1096 p->pDestructor = pDestructor;
1100 p->xFinalize = xFinal;
1101 p->pUserData = pUserData;
1102 p->nArg = (u16)nArg;
1107 ** Create new user functions.
1109 int sqlite3_create_function(
1115 void (*xFunc)(sqlite3_context*,int,sqlite3_value **),
1116 void (*xStep)(sqlite3_context*,int,sqlite3_value **),
1117 void (*xFinal)(sqlite3_context*)
1119 return sqlite3_create_function_v2(db, zFunc, nArg, enc, p, xFunc, xStep,
1123 int sqlite3_create_function_v2(
1129 void (*xFunc)(sqlite3_context*,int,sqlite3_value **),
1130 void (*xStep)(sqlite3_context*,int,sqlite3_value **),
1131 void (*xFinal)(sqlite3_context*),
1132 void (*xDestroy)(void *)
1134 int rc = SQLITE_ERROR;
1135 FuncDestructor *pArg = 0;
1136 sqlite3_mutex_enter(db->mutex);
1138 pArg = (FuncDestructor *)sqlite3DbMallocZero(db, sizeof(FuncDestructor));
1143 pArg->xDestroy = xDestroy;
1144 pArg->pUserData = p;
1146 rc = sqlite3CreateFunc(db, zFunc, nArg, enc, p, xFunc, xStep, xFinal, pArg);
1147 if( pArg && pArg->nRef==0 ){
1148 assert( rc!=SQLITE_OK );
1150 sqlite3DbFree(db, pArg);
1154 rc = sqlite3ApiExit(db, rc);
1155 sqlite3_mutex_leave(db->mutex);
1159 #ifndef SQLITE_OMIT_UTF16
1160 int sqlite3_create_function16(
1162 const void *zFunctionName,
1166 void (*xFunc)(sqlite3_context*,int,sqlite3_value**),
1167 void (*xStep)(sqlite3_context*,int,sqlite3_value**),
1168 void (*xFinal)(sqlite3_context*)
1172 sqlite3_mutex_enter(db->mutex);
1173 assert( !db->mallocFailed );
1174 zFunc8 = sqlite3Utf16to8(db, zFunctionName, -1, SQLITE_UTF16NATIVE);
1175 rc = sqlite3CreateFunc(db, zFunc8, nArg, eTextRep, p, xFunc, xStep, xFinal,0);
1176 sqlite3DbFree(db, zFunc8);
1177 rc = sqlite3ApiExit(db, rc);
1178 sqlite3_mutex_leave(db->mutex);
1185 ** Declare that a function has been overloaded by a virtual table.
1187 ** If the function already exists as a regular global function, then
1188 ** this routine is a no-op. If the function does not exist, then create
1189 ** a new one that always throws a run-time error.
1191 ** When virtual tables intend to provide an overloaded function, they
1192 ** should call this routine to make sure the global function exists.
1193 ** A global function must exist in order for name resolution to work
1196 int sqlite3_overload_function(
1201 int nName = sqlite3Strlen30(zName);
1203 sqlite3_mutex_enter(db->mutex);
1204 if( sqlite3FindFunction(db, zName, nName, nArg, SQLITE_UTF8, 0)==0 ){
1205 sqlite3CreateFunc(db, zName, nArg, SQLITE_UTF8,
1206 0, sqlite3InvalidFunction, 0, 0, 0);
1208 rc = sqlite3ApiExit(db, SQLITE_OK);
1209 sqlite3_mutex_leave(db->mutex);
1213 #ifndef SQLITE_OMIT_TRACE
1215 ** Register a trace function. The pArg from the previously registered trace
1218 ** A NULL trace function means that no tracing is executes. A non-NULL
1219 ** trace is a pointer to a function that is invoked at the start of each
1222 void *sqlite3_trace(sqlite3 *db, void (*xTrace)(void*,const char*), void *pArg){
1224 sqlite3_mutex_enter(db->mutex);
1225 pOld = db->pTraceArg;
1226 db->xTrace = xTrace;
1227 db->pTraceArg = pArg;
1228 sqlite3_mutex_leave(db->mutex);
1232 ** Register a profile function. The pArg from the previously registered
1233 ** profile function is returned.
1235 ** A NULL profile function means that no profiling is executes. A non-NULL
1236 ** profile is a pointer to a function that is invoked at the conclusion of
1237 ** each SQL statement that is run.
1239 void *sqlite3_profile(
1241 void (*xProfile)(void*,const char*,sqlite_uint64),
1245 sqlite3_mutex_enter(db->mutex);
1246 pOld = db->pProfileArg;
1247 db->xProfile = xProfile;
1248 db->pProfileArg = pArg;
1249 sqlite3_mutex_leave(db->mutex);
1252 #endif /* SQLITE_OMIT_TRACE */
1254 /*** EXPERIMENTAL ***
1256 ** Register a function to be invoked when a transaction comments.
1257 ** If the invoked function returns non-zero, then the commit becomes a
1260 void *sqlite3_commit_hook(
1261 sqlite3 *db, /* Attach the hook to this database */
1262 int (*xCallback)(void*), /* Function to invoke on each commit */
1263 void *pArg /* Argument to the function */
1266 sqlite3_mutex_enter(db->mutex);
1267 pOld = db->pCommitArg;
1268 db->xCommitCallback = xCallback;
1269 db->pCommitArg = pArg;
1270 sqlite3_mutex_leave(db->mutex);
1275 ** Register a callback to be invoked each time a row is updated,
1276 ** inserted or deleted using this database connection.
1278 void *sqlite3_update_hook(
1279 sqlite3 *db, /* Attach the hook to this database */
1280 void (*xCallback)(void*,int,char const *,char const *,sqlite_int64),
1281 void *pArg /* Argument to the function */
1284 sqlite3_mutex_enter(db->mutex);
1285 pRet = db->pUpdateArg;
1286 db->xUpdateCallback = xCallback;
1287 db->pUpdateArg = pArg;
1288 sqlite3_mutex_leave(db->mutex);
1293 ** Register a callback to be invoked each time a transaction is rolled
1294 ** back by this database connection.
1296 void *sqlite3_rollback_hook(
1297 sqlite3 *db, /* Attach the hook to this database */
1298 void (*xCallback)(void*), /* Callback function */
1299 void *pArg /* Argument to the function */
1302 sqlite3_mutex_enter(db->mutex);
1303 pRet = db->pRollbackArg;
1304 db->xRollbackCallback = xCallback;
1305 db->pRollbackArg = pArg;
1306 sqlite3_mutex_leave(db->mutex);
1310 #ifndef SQLITE_OMIT_WAL
1312 ** The sqlite3_wal_hook() callback registered by sqlite3_wal_autocheckpoint().
1313 ** Invoke sqlite3_wal_checkpoint if the number of frames in the log file
1314 ** is greater than sqlite3.pWalArg cast to an integer (the value configured by
1315 ** wal_autocheckpoint()).
1317 int sqlite3WalDefaultHook(
1318 void *pClientData, /* Argument */
1319 sqlite3 *db, /* Connection */
1320 const char *zDb, /* Database */
1321 int nFrame /* Size of WAL */
1323 if( nFrame>=SQLITE_PTR_TO_INT(pClientData) ){
1324 sqlite3BeginBenignMalloc();
1325 sqlite3_wal_checkpoint(db, zDb);
1326 sqlite3EndBenignMalloc();
1330 #endif /* SQLITE_OMIT_WAL */
1333 ** Configure an sqlite3_wal_hook() callback to automatically checkpoint
1334 ** a database after committing a transaction if there are nFrame or
1335 ** more frames in the log file. Passing zero or a negative value as the
1336 ** nFrame parameter disables automatic checkpoints entirely.
1338 ** The callback registered by this function replaces any existing callback
1339 ** registered using sqlite3_wal_hook(). Likewise, registering a callback
1340 ** using sqlite3_wal_hook() disables the automatic checkpoint mechanism
1341 ** configured by this function.
1343 int sqlite3_wal_autocheckpoint(sqlite3 *db, int nFrame){
1344 #ifdef SQLITE_OMIT_WAL
1345 UNUSED_PARAMETER(db);
1346 UNUSED_PARAMETER(nFrame);
1349 sqlite3_wal_hook(db, sqlite3WalDefaultHook, SQLITE_INT_TO_PTR(nFrame));
1351 sqlite3_wal_hook(db, 0, 0);
1358 ** Register a callback to be invoked each time a transaction is written
1359 ** into the write-ahead-log by this database connection.
1361 void *sqlite3_wal_hook(
1362 sqlite3 *db, /* Attach the hook to this db handle */
1363 int(*xCallback)(void *, sqlite3*, const char*, int),
1364 void *pArg /* First argument passed to xCallback() */
1366 #ifndef SQLITE_OMIT_WAL
1368 sqlite3_mutex_enter(db->mutex);
1370 db->xWalCallback = xCallback;
1372 sqlite3_mutex_leave(db->mutex);
1380 ** Checkpoint database zDb.
1382 int sqlite3_wal_checkpoint_v2(
1383 sqlite3 *db, /* Database handle */
1384 const char *zDb, /* Name of attached database (or NULL) */
1385 int eMode, /* SQLITE_CHECKPOINT_* value */
1386 int *pnLog, /* OUT: Size of WAL log in frames */
1387 int *pnCkpt /* OUT: Total number of frames checkpointed */
1389 #ifdef SQLITE_OMIT_WAL
1392 int rc; /* Return code */
1393 int iDb = SQLITE_MAX_ATTACHED; /* sqlite3.aDb[] index of db to checkpoint */
1395 /* Initialize the output variables to -1 in case an error occurs. */
1396 if( pnLog ) *pnLog = -1;
1397 if( pnCkpt ) *pnCkpt = -1;
1399 assert( SQLITE_CHECKPOINT_FULL>SQLITE_CHECKPOINT_PASSIVE );
1400 assert( SQLITE_CHECKPOINT_FULL<SQLITE_CHECKPOINT_RESTART );
1401 assert( SQLITE_CHECKPOINT_PASSIVE+2==SQLITE_CHECKPOINT_RESTART );
1402 if( eMode<SQLITE_CHECKPOINT_PASSIVE || eMode>SQLITE_CHECKPOINT_RESTART ){
1403 return SQLITE_MISUSE;
1406 sqlite3_mutex_enter(db->mutex);
1407 if( zDb && zDb[0] ){
1408 iDb = sqlite3FindDbName(db, zDb);
1412 sqlite3Error(db, SQLITE_ERROR, "unknown database: %s", zDb);
1414 rc = sqlite3Checkpoint(db, iDb, eMode, pnLog, pnCkpt);
1415 sqlite3Error(db, rc, 0);
1417 rc = sqlite3ApiExit(db, rc);
1418 sqlite3_mutex_leave(db->mutex);
1425 ** Checkpoint database zDb. If zDb is NULL, or if the buffer zDb points
1426 ** to contains a zero-length string, all attached databases are
1429 int sqlite3_wal_checkpoint(sqlite3 *db, const char *zDb){
1430 return sqlite3_wal_checkpoint_v2(db, zDb, SQLITE_CHECKPOINT_PASSIVE, 0, 0);
1433 #ifndef SQLITE_OMIT_WAL
1435 ** Run a checkpoint on database iDb. This is a no-op if database iDb is
1436 ** not currently open in WAL mode.
1438 ** If a transaction is open on the database being checkpointed, this
1439 ** function returns SQLITE_LOCKED and a checkpoint is not attempted. If
1440 ** an error occurs while running the checkpoint, an SQLite error code is
1441 ** returned (i.e. SQLITE_IOERR). Otherwise, SQLITE_OK.
1443 ** The mutex on database handle db should be held by the caller. The mutex
1444 ** associated with the specific b-tree being checkpointed is taken by
1445 ** this function while the checkpoint is running.
1447 ** If iDb is passed SQLITE_MAX_ATTACHED, then all attached databases are
1448 ** checkpointed. If an error is encountered it is returned immediately -
1449 ** no attempt is made to checkpoint any remaining databases.
1451 ** Parameter eMode is one of SQLITE_CHECKPOINT_PASSIVE, FULL or RESTART.
1453 int sqlite3Checkpoint(sqlite3 *db, int iDb, int eMode, int *pnLog, int *pnCkpt){
1454 int rc = SQLITE_OK; /* Return code */
1455 int i; /* Used to iterate through attached dbs */
1456 int bBusy = 0; /* True if SQLITE_BUSY has been encountered */
1458 assert( sqlite3_mutex_held(db->mutex) );
1459 assert( !pnLog || *pnLog==-1 );
1460 assert( !pnCkpt || *pnCkpt==-1 );
1462 for(i=0; i<db->nDb && rc==SQLITE_OK; i++){
1463 if( i==iDb || iDb==SQLITE_MAX_ATTACHED ){
1464 rc = sqlite3BtreeCheckpoint(db->aDb[i].pBt, eMode, pnLog, pnCkpt);
1467 if( rc==SQLITE_BUSY ){
1474 return (rc==SQLITE_OK && bBusy) ? SQLITE_BUSY : rc;
1476 #endif /* SQLITE_OMIT_WAL */
1479 ** This function returns true if main-memory should be used instead of
1480 ** a temporary file for transient pager files and statement journals.
1481 ** The value returned depends on the value of db->temp_store (runtime
1482 ** parameter) and the compile time value of SQLITE_TEMP_STORE. The
1483 ** following table describes the relationship between these two values
1484 ** and this functions return value.
1486 ** SQLITE_TEMP_STORE db->temp_store Location of temporary database
1487 ** ----------------- -------------- ------------------------------
1488 ** 0 any file (return 0)
1489 ** 1 1 file (return 0)
1490 ** 1 2 memory (return 1)
1491 ** 1 0 file (return 0)
1492 ** 2 1 file (return 0)
1493 ** 2 2 memory (return 1)
1494 ** 2 0 memory (return 1)
1495 ** 3 any memory (return 1)
1497 int sqlite3TempInMemory(const sqlite3 *db){
1498 #if SQLITE_TEMP_STORE==1
1499 return ( db->temp_store==2 );
1501 #if SQLITE_TEMP_STORE==2
1502 return ( db->temp_store!=1 );
1504 #if SQLITE_TEMP_STORE==3
1507 #if SQLITE_TEMP_STORE<1 || SQLITE_TEMP_STORE>3
1513 ** Return UTF-8 encoded English language explanation of the most recent
1516 const char *sqlite3_errmsg(sqlite3 *db){
1519 return sqlite3ErrStr(SQLITE_NOMEM);
1521 if( !sqlite3SafetyCheckSickOrOk(db) ){
1522 return sqlite3ErrStr(SQLITE_MISUSE_BKPT);
1524 sqlite3_mutex_enter(db->mutex);
1525 if( db->mallocFailed ){
1526 z = sqlite3ErrStr(SQLITE_NOMEM);
1528 z = (char*)sqlite3_value_text(db->pErr);
1529 assert( !db->mallocFailed );
1531 z = sqlite3ErrStr(db->errCode);
1534 sqlite3_mutex_leave(db->mutex);
1538 #ifndef SQLITE_OMIT_UTF16
1540 ** Return UTF-16 encoded English language explanation of the most recent
1543 const void *sqlite3_errmsg16(sqlite3 *db){
1544 static const u16 outOfMem[] = {
1545 'o', 'u', 't', ' ', 'o', 'f', ' ', 'm', 'e', 'm', 'o', 'r', 'y', 0
1547 static const u16 misuse[] = {
1548 'l', 'i', 'b', 'r', 'a', 'r', 'y', ' ',
1549 'r', 'o', 'u', 't', 'i', 'n', 'e', ' ',
1550 'c', 'a', 'l', 'l', 'e', 'd', ' ',
1553 's', 'e', 'q', 'u', 'e', 'n', 'c', 'e', 0
1558 return (void *)outOfMem;
1560 if( !sqlite3SafetyCheckSickOrOk(db) ){
1561 return (void *)misuse;
1563 sqlite3_mutex_enter(db->mutex);
1564 if( db->mallocFailed ){
1565 z = (void *)outOfMem;
1567 z = sqlite3_value_text16(db->pErr);
1569 sqlite3ValueSetStr(db->pErr, -1, sqlite3ErrStr(db->errCode),
1570 SQLITE_UTF8, SQLITE_STATIC);
1571 z = sqlite3_value_text16(db->pErr);
1573 /* A malloc() may have failed within the call to sqlite3_value_text16()
1574 ** above. If this is the case, then the db->mallocFailed flag needs to
1575 ** be cleared before returning. Do this directly, instead of via
1576 ** sqlite3ApiExit(), to avoid setting the database handle error message.
1578 db->mallocFailed = 0;
1580 sqlite3_mutex_leave(db->mutex);
1583 #endif /* SQLITE_OMIT_UTF16 */
1586 ** Return the most recent error code generated by an SQLite routine. If NULL is
1587 ** passed to this function, we assume a malloc() failed during sqlite3_open().
1589 int sqlite3_errcode(sqlite3 *db){
1590 if( db && !sqlite3SafetyCheckSickOrOk(db) ){
1591 return SQLITE_MISUSE_BKPT;
1593 if( !db || db->mallocFailed ){
1594 return SQLITE_NOMEM;
1596 return db->errCode & db->errMask;
1598 int sqlite3_extended_errcode(sqlite3 *db){
1599 if( db && !sqlite3SafetyCheckSickOrOk(db) ){
1600 return SQLITE_MISUSE_BKPT;
1602 if( !db || db->mallocFailed ){
1603 return SQLITE_NOMEM;
1609 ** Create a new collating function for database "db". The name is zName
1610 ** and the encoding is enc.
1612 static int createCollation(
1618 int(*xCompare)(void*,int,const void*,int,const void*),
1623 int nName = sqlite3Strlen30(zName);
1625 assert( sqlite3_mutex_held(db->mutex) );
1627 /* If SQLITE_UTF16 is specified as the encoding type, transform this
1628 ** to one of SQLITE_UTF16LE or SQLITE_UTF16BE using the
1629 ** SQLITE_UTF16NATIVE macro. SQLITE_UTF16 is not used internally.
1632 testcase( enc2==SQLITE_UTF16 );
1633 testcase( enc2==SQLITE_UTF16_ALIGNED );
1634 if( enc2==SQLITE_UTF16 || enc2==SQLITE_UTF16_ALIGNED ){
1635 enc2 = SQLITE_UTF16NATIVE;
1637 if( enc2<SQLITE_UTF8 || enc2>SQLITE_UTF16BE ){
1638 return SQLITE_MISUSE_BKPT;
1641 /* Check if this call is removing or replacing an existing collation
1642 ** sequence. If so, and there are active VMs, return busy. If there
1643 ** are no active VMs, invalidate any pre-compiled statements.
1645 pColl = sqlite3FindCollSeq(db, (u8)enc2, zName, 0);
1646 if( pColl && pColl->xCmp ){
1647 if( db->activeVdbeCnt ){
1648 sqlite3Error(db, SQLITE_BUSY,
1649 "unable to delete/modify collation sequence due to active statements");
1652 sqlite3ExpirePreparedStatements(db);
1654 /* If collation sequence pColl was created directly by a call to
1655 ** sqlite3_create_collation, and not generated by synthCollSeq(),
1656 ** then any copies made by synthCollSeq() need to be invalidated.
1657 ** Also, collation destructor - CollSeq.xDel() - function may need
1660 if( (pColl->enc & ~SQLITE_UTF16_ALIGNED)==enc2 ){
1661 CollSeq *aColl = sqlite3HashFind(&db->aCollSeq, zName, nName);
1664 CollSeq *p = &aColl[j];
1665 if( p->enc==pColl->enc ){
1675 pColl = sqlite3FindCollSeq(db, (u8)enc2, zName, 1);
1676 if( pColl==0 ) return SQLITE_NOMEM;
1677 pColl->xCmp = xCompare;
1678 pColl->pUser = pCtx;
1680 pColl->enc = (u8)(enc2 | (enc & SQLITE_UTF16_ALIGNED));
1681 pColl->type = collType;
1682 sqlite3Error(db, SQLITE_OK, 0);
1688 ** This array defines hard upper bounds on limit values. The
1689 ** initializer must be kept in sync with the SQLITE_LIMIT_*
1690 ** #defines in sqlite3.h.
1692 static const int aHardLimit[] = {
1694 SQLITE_MAX_SQL_LENGTH,
1696 SQLITE_MAX_EXPR_DEPTH,
1697 SQLITE_MAX_COMPOUND_SELECT,
1699 SQLITE_MAX_FUNCTION_ARG,
1700 SQLITE_MAX_ATTACHED,
1701 SQLITE_MAX_LIKE_PATTERN_LENGTH,
1702 SQLITE_MAX_VARIABLE_NUMBER,
1703 SQLITE_MAX_TRIGGER_DEPTH,
1707 ** Make sure the hard limits are set to reasonable values
1709 #if SQLITE_MAX_LENGTH<100
1710 # error SQLITE_MAX_LENGTH must be at least 100
1712 #if SQLITE_MAX_SQL_LENGTH<100
1713 # error SQLITE_MAX_SQL_LENGTH must be at least 100
1715 #if SQLITE_MAX_SQL_LENGTH>SQLITE_MAX_LENGTH
1716 # error SQLITE_MAX_SQL_LENGTH must not be greater than SQLITE_MAX_LENGTH
1718 #if SQLITE_MAX_COMPOUND_SELECT<2
1719 # error SQLITE_MAX_COMPOUND_SELECT must be at least 2
1721 #if SQLITE_MAX_VDBE_OP<40
1722 # error SQLITE_MAX_VDBE_OP must be at least 40
1724 #if SQLITE_MAX_FUNCTION_ARG<0 || SQLITE_MAX_FUNCTION_ARG>1000
1725 # error SQLITE_MAX_FUNCTION_ARG must be between 0 and 1000
1727 #if SQLITE_MAX_ATTACHED<0 || SQLITE_MAX_ATTACHED>62
1728 # error SQLITE_MAX_ATTACHED must be between 0 and 62
1730 #if SQLITE_MAX_LIKE_PATTERN_LENGTH<1
1731 # error SQLITE_MAX_LIKE_PATTERN_LENGTH must be at least 1
1733 #if SQLITE_MAX_COLUMN>32767
1734 # error SQLITE_MAX_COLUMN must not exceed 32767
1736 #if SQLITE_MAX_TRIGGER_DEPTH<1
1737 # error SQLITE_MAX_TRIGGER_DEPTH must be at least 1
1742 ** Change the value of a limit. Report the old value.
1743 ** If an invalid limit index is supplied, report -1.
1744 ** Make no changes but still report the old value if the
1745 ** new limit is negative.
1747 ** A new lower limit does not shrink existing constructs.
1748 ** It merely prevents new constructs that exceed the limit
1751 int sqlite3_limit(sqlite3 *db, int limitId, int newLimit){
1755 /* EVIDENCE-OF: R-30189-54097 For each limit category SQLITE_LIMIT_NAME
1756 ** there is a hard upper bound set at compile-time by a C preprocessor
1757 ** macro called SQLITE_MAX_NAME. (The "_LIMIT_" in the name is changed to
1760 assert( aHardLimit[SQLITE_LIMIT_LENGTH]==SQLITE_MAX_LENGTH );
1761 assert( aHardLimit[SQLITE_LIMIT_SQL_LENGTH]==SQLITE_MAX_SQL_LENGTH );
1762 assert( aHardLimit[SQLITE_LIMIT_COLUMN]==SQLITE_MAX_COLUMN );
1763 assert( aHardLimit[SQLITE_LIMIT_EXPR_DEPTH]==SQLITE_MAX_EXPR_DEPTH );
1764 assert( aHardLimit[SQLITE_LIMIT_COMPOUND_SELECT]==SQLITE_MAX_COMPOUND_SELECT);
1765 assert( aHardLimit[SQLITE_LIMIT_VDBE_OP]==SQLITE_MAX_VDBE_OP );
1766 assert( aHardLimit[SQLITE_LIMIT_FUNCTION_ARG]==SQLITE_MAX_FUNCTION_ARG );
1767 assert( aHardLimit[SQLITE_LIMIT_ATTACHED]==SQLITE_MAX_ATTACHED );
1768 assert( aHardLimit[SQLITE_LIMIT_LIKE_PATTERN_LENGTH]==
1769 SQLITE_MAX_LIKE_PATTERN_LENGTH );
1770 assert( aHardLimit[SQLITE_LIMIT_VARIABLE_NUMBER]==SQLITE_MAX_VARIABLE_NUMBER);
1771 assert( aHardLimit[SQLITE_LIMIT_TRIGGER_DEPTH]==SQLITE_MAX_TRIGGER_DEPTH );
1772 assert( SQLITE_LIMIT_TRIGGER_DEPTH==(SQLITE_N_LIMIT-1) );
1775 if( limitId<0 || limitId>=SQLITE_N_LIMIT ){
1778 oldLimit = db->aLimit[limitId];
1779 if( newLimit>=0 ){ /* IMP: R-52476-28732 */
1780 if( newLimit>aHardLimit[limitId] ){
1781 newLimit = aHardLimit[limitId]; /* IMP: R-51463-25634 */
1783 db->aLimit[limitId] = newLimit;
1785 return oldLimit; /* IMP: R-53341-35419 */
1789 ** This routine does the work of opening a database on behalf of
1790 ** sqlite3_open() and sqlite3_open16(). The database filename "zFilename"
1791 ** is UTF-8 encoded.
1793 static int openDatabase(
1794 const char *zFilename, /* Database filename UTF-8 encoded */
1795 sqlite3 **ppDb, /* OUT: Returned database handle */
1796 unsigned flags, /* Operational flags */
1797 const char *zVfs /* Name of the VFS to use */
1804 #ifndef SQLITE_OMIT_AUTOINIT
1805 rc = sqlite3_initialize();
1809 /* Only allow sensible combinations of bits in the flags argument.
1810 ** Throw an error if any non-sense combination is used. If we
1811 ** do not block illegal combinations here, it could trigger
1812 ** assert() statements in deeper layers. Sensible combinations
1815 ** 1: SQLITE_OPEN_READONLY
1816 ** 2: SQLITE_OPEN_READWRITE
1817 ** 6: SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE
1819 assert( SQLITE_OPEN_READONLY == 0x01 );
1820 assert( SQLITE_OPEN_READWRITE == 0x02 );
1821 assert( SQLITE_OPEN_CREATE == 0x04 );
1822 testcase( (1<<(flags&7))==0x02 ); /* READONLY */
1823 testcase( (1<<(flags&7))==0x04 ); /* READWRITE */
1824 testcase( (1<<(flags&7))==0x40 ); /* READWRITE | CREATE */
1825 if( ((1<<(flags&7)) & 0x46)==0 ) return SQLITE_MISUSE;
1827 if( sqlite3GlobalConfig.bCoreMutex==0 ){
1829 }else if( flags & SQLITE_OPEN_NOMUTEX ){
1831 }else if( flags & SQLITE_OPEN_FULLMUTEX ){
1834 isThreadsafe = sqlite3GlobalConfig.bFullMutex;
1836 if( flags & SQLITE_OPEN_PRIVATECACHE ){
1837 flags &= ~SQLITE_OPEN_SHAREDCACHE;
1838 }else if( sqlite3GlobalConfig.sharedCacheEnabled ){
1839 flags |= SQLITE_OPEN_SHAREDCACHE;
1842 /* Remove harmful bits from the flags parameter
1844 ** The SQLITE_OPEN_NOMUTEX and SQLITE_OPEN_FULLMUTEX flags were
1845 ** dealt with in the previous code block. Besides these, the only
1846 ** valid input flags for sqlite3_open_v2() are SQLITE_OPEN_READONLY,
1847 ** SQLITE_OPEN_READWRITE, SQLITE_OPEN_CREATE, SQLITE_OPEN_SHAREDCACHE,
1848 ** SQLITE_OPEN_PRIVATECACHE, and some reserved bits. Silently mask
1849 ** off all other flags.
1851 flags &= ~( SQLITE_OPEN_DELETEONCLOSE |
1852 SQLITE_OPEN_EXCLUSIVE |
1853 SQLITE_OPEN_MAIN_DB |
1854 SQLITE_OPEN_TEMP_DB |
1855 SQLITE_OPEN_TRANSIENT_DB |
1856 SQLITE_OPEN_MAIN_JOURNAL |
1857 SQLITE_OPEN_TEMP_JOURNAL |
1858 SQLITE_OPEN_SUBJOURNAL |
1859 SQLITE_OPEN_MASTER_JOURNAL |
1860 SQLITE_OPEN_NOMUTEX |
1861 SQLITE_OPEN_FULLMUTEX |
1865 /* Allocate the sqlite data structure */
1866 db = sqlite3MallocZero( sizeof(sqlite3) );
1867 if( db==0 ) goto opendb_out;
1869 db->mutex = sqlite3MutexAlloc(SQLITE_MUTEX_RECURSIVE);
1876 sqlite3_mutex_enter(db->mutex);
1879 db->magic = SQLITE_MAGIC_BUSY;
1880 db->aDb = db->aDbStatic;
1882 assert( sizeof(db->aLimit)==sizeof(aHardLimit) );
1883 memcpy(db->aLimit, aHardLimit, sizeof(db->aLimit));
1885 db->nextAutovac = -1;
1886 db->nextPagesize = 0;
1887 db->flags |= SQLITE_ShortColNames | SQLITE_AutoIndex | SQLITE_EnableTrigger
1888 #if SQLITE_DEFAULT_FILE_FORMAT<4
1889 | SQLITE_LegacyFileFmt
1891 #ifdef SQLITE_ENABLE_LOAD_EXTENSION
1892 | SQLITE_LoadExtension
1894 #if SQLITE_DEFAULT_RECURSIVE_TRIGGERS
1895 | SQLITE_RecTriggers
1897 #if defined(SQLITE_DEFAULT_FOREIGN_KEYS) && SQLITE_DEFAULT_FOREIGN_KEYS
1898 | SQLITE_ForeignKeys
1901 sqlite3HashInit(&db->aCollSeq);
1902 #ifndef SQLITE_OMIT_VIRTUALTABLE
1903 sqlite3HashInit(&db->aModule);
1906 db->pVfs = sqlite3_vfs_find(zVfs);
1909 sqlite3Error(db, rc, "no such vfs: %s", zVfs);
1913 /* Add the default collation sequence BINARY. BINARY works for both UTF-8
1914 ** and UTF-16, so add a version for each to avoid any unnecessary
1915 ** conversions. The only error that can occur here is a malloc() failure.
1917 createCollation(db, "BINARY", SQLITE_UTF8, SQLITE_COLL_BINARY, 0,
1919 createCollation(db, "BINARY", SQLITE_UTF16BE, SQLITE_COLL_BINARY, 0,
1921 createCollation(db, "BINARY", SQLITE_UTF16LE, SQLITE_COLL_BINARY, 0,
1923 createCollation(db, "RTRIM", SQLITE_UTF8, SQLITE_COLL_USER, (void*)1,
1925 if( db->mallocFailed ){
1928 db->pDfltColl = sqlite3FindCollSeq(db, SQLITE_UTF8, "BINARY", 0);
1929 assert( db->pDfltColl!=0 );
1931 /* Also add a UTF-8 case-insensitive collation sequence. */
1932 createCollation(db, "NOCASE", SQLITE_UTF8, SQLITE_COLL_NOCASE, 0,
1933 nocaseCollatingFunc, 0);
1935 /* Open the backend database driver */
1936 db->openFlags = flags;
1937 rc = sqlite3BtreeOpen(zFilename, db, &db->aDb[0].pBt, 0,
1938 flags | SQLITE_OPEN_MAIN_DB);
1939 if( rc!=SQLITE_OK ){
1940 if( rc==SQLITE_IOERR_NOMEM ){
1943 sqlite3Error(db, rc, 0);
1946 db->aDb[0].pSchema = sqlite3SchemaGet(db, db->aDb[0].pBt);
1947 db->aDb[1].pSchema = sqlite3SchemaGet(db, 0);
1950 /* The default safety_level for the main database is 'full'; for the temp
1951 ** database it is 'NONE'. This matches the pager layer defaults.
1953 db->aDb[0].zName = "main";
1954 db->aDb[0].safety_level = 3;
1955 db->aDb[1].zName = "temp";
1956 db->aDb[1].safety_level = 1;
1958 db->magic = SQLITE_MAGIC_OPEN;
1959 if( db->mallocFailed ){
1963 /* Register all built-in functions, but do not attempt to read the
1964 ** database schema yet. This is delayed until the first time the database
1967 sqlite3Error(db, SQLITE_OK, 0);
1968 sqlite3RegisterBuiltinFunctions(db);
1970 /* Load automatic extensions - extensions that have been registered
1971 ** using the sqlite3_automatic_extension() API.
1973 sqlite3AutoLoadExtensions(db);
1974 rc = sqlite3_errcode(db);
1975 if( rc!=SQLITE_OK ){
1979 #ifdef SQLITE_ENABLE_FTS1
1980 if( !db->mallocFailed ){
1981 extern int sqlite3Fts1Init(sqlite3*);
1982 rc = sqlite3Fts1Init(db);
1986 #ifdef SQLITE_ENABLE_FTS2
1987 if( !db->mallocFailed && rc==SQLITE_OK ){
1988 extern int sqlite3Fts2Init(sqlite3*);
1989 rc = sqlite3Fts2Init(db);
1993 #ifdef SQLITE_ENABLE_FTS3
1994 if( !db->mallocFailed && rc==SQLITE_OK ){
1995 rc = sqlite3Fts3Init(db);
1999 #ifdef SQLITE_ENABLE_ICU
2000 if( !db->mallocFailed && rc==SQLITE_OK ){
2001 rc = sqlite3IcuInit(db);
2005 #ifdef SQLITE_ENABLE_RTREE
2006 if( !db->mallocFailed && rc==SQLITE_OK){
2007 rc = sqlite3RtreeInit(db);
2011 sqlite3Error(db, rc, 0);
2013 /* -DSQLITE_DEFAULT_LOCKING_MODE=1 makes EXCLUSIVE the default locking
2014 ** mode. -DSQLITE_DEFAULT_LOCKING_MODE=0 make NORMAL the default locking
2015 ** mode. Doing nothing at all also makes NORMAL the default.
2017 #ifdef SQLITE_DEFAULT_LOCKING_MODE
2018 db->dfltLockMode = SQLITE_DEFAULT_LOCKING_MODE;
2019 sqlite3PagerLockingMode(sqlite3BtreePager(db->aDb[0].pBt),
2020 SQLITE_DEFAULT_LOCKING_MODE);
2023 /* Enable the lookaside-malloc subsystem */
2024 setupLookaside(db, 0, sqlite3GlobalConfig.szLookaside,
2025 sqlite3GlobalConfig.nLookaside);
2027 sqlite3_wal_autocheckpoint(db, SQLITE_DEFAULT_WAL_AUTOCHECKPOINT);
2031 assert( db->mutex!=0 || isThreadsafe==0 || sqlite3GlobalConfig.bFullMutex==0 );
2032 sqlite3_mutex_leave(db->mutex);
2034 rc = sqlite3_errcode(db);
2035 if( rc==SQLITE_NOMEM ){
2038 }else if( rc!=SQLITE_OK ){
2039 db->magic = SQLITE_MAGIC_SICK;
2042 return sqlite3ApiExit(0, rc);
2046 ** Open a new database handle.
2049 const char *zFilename,
2052 return openDatabase(zFilename, ppDb,
2053 SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE, 0);
2055 int sqlite3_open_v2(
2056 const char *filename, /* Database filename (UTF-8) */
2057 sqlite3 **ppDb, /* OUT: SQLite db handle */
2058 int flags, /* Flags */
2059 const char *zVfs /* Name of VFS module to use */
2061 return openDatabase(filename, ppDb, flags, zVfs);
2064 #ifndef SQLITE_OMIT_UTF16
2066 ** Open a new database handle.
2069 const void *zFilename,
2072 char const *zFilename8; /* zFilename encoded in UTF-8 instead of UTF-16 */
2073 sqlite3_value *pVal;
2076 assert( zFilename );
2079 #ifndef SQLITE_OMIT_AUTOINIT
2080 rc = sqlite3_initialize();
2083 pVal = sqlite3ValueNew(0);
2084 sqlite3ValueSetStr(pVal, -1, zFilename, SQLITE_UTF16NATIVE, SQLITE_STATIC);
2085 zFilename8 = sqlite3ValueText(pVal, SQLITE_UTF8);
2087 rc = openDatabase(zFilename8, ppDb,
2088 SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE, 0);
2089 assert( *ppDb || rc==SQLITE_NOMEM );
2090 if( rc==SQLITE_OK && !DbHasProperty(*ppDb, 0, DB_SchemaLoaded) ){
2091 ENC(*ppDb) = SQLITE_UTF16NATIVE;
2096 sqlite3ValueFree(pVal);
2098 return sqlite3ApiExit(0, rc);
2100 #endif /* SQLITE_OMIT_UTF16 */
2103 ** Register a new collation sequence with the database handle db.
2105 int sqlite3_create_collation(
2110 int(*xCompare)(void*,int,const void*,int,const void*)
2113 sqlite3_mutex_enter(db->mutex);
2114 assert( !db->mallocFailed );
2115 rc = createCollation(db, zName, (u8)enc, SQLITE_COLL_USER, pCtx, xCompare, 0);
2116 rc = sqlite3ApiExit(db, rc);
2117 sqlite3_mutex_leave(db->mutex);
2122 ** Register a new collation sequence with the database handle db.
2124 int sqlite3_create_collation_v2(
2129 int(*xCompare)(void*,int,const void*,int,const void*),
2133 sqlite3_mutex_enter(db->mutex);
2134 assert( !db->mallocFailed );
2135 rc = createCollation(db, zName, (u8)enc, SQLITE_COLL_USER, pCtx, xCompare, xDel);
2136 rc = sqlite3ApiExit(db, rc);
2137 sqlite3_mutex_leave(db->mutex);
2141 #ifndef SQLITE_OMIT_UTF16
2143 ** Register a new collation sequence with the database handle db.
2145 int sqlite3_create_collation16(
2150 int(*xCompare)(void*,int,const void*,int,const void*)
2154 sqlite3_mutex_enter(db->mutex);
2155 assert( !db->mallocFailed );
2156 zName8 = sqlite3Utf16to8(db, zName, -1, SQLITE_UTF16NATIVE);
2158 rc = createCollation(db, zName8, (u8)enc, SQLITE_COLL_USER, pCtx, xCompare, 0);
2159 sqlite3DbFree(db, zName8);
2161 rc = sqlite3ApiExit(db, rc);
2162 sqlite3_mutex_leave(db->mutex);
2165 #endif /* SQLITE_OMIT_UTF16 */
2168 ** Register a collation sequence factory callback with the database handle
2169 ** db. Replace any previously installed collation sequence factory.
2171 int sqlite3_collation_needed(
2173 void *pCollNeededArg,
2174 void(*xCollNeeded)(void*,sqlite3*,int eTextRep,const char*)
2176 sqlite3_mutex_enter(db->mutex);
2177 db->xCollNeeded = xCollNeeded;
2178 db->xCollNeeded16 = 0;
2179 db->pCollNeededArg = pCollNeededArg;
2180 sqlite3_mutex_leave(db->mutex);
2184 #ifndef SQLITE_OMIT_UTF16
2186 ** Register a collation sequence factory callback with the database handle
2187 ** db. Replace any previously installed collation sequence factory.
2189 int sqlite3_collation_needed16(
2191 void *pCollNeededArg,
2192 void(*xCollNeeded16)(void*,sqlite3*,int eTextRep,const void*)
2194 sqlite3_mutex_enter(db->mutex);
2195 db->xCollNeeded = 0;
2196 db->xCollNeeded16 = xCollNeeded16;
2197 db->pCollNeededArg = pCollNeededArg;
2198 sqlite3_mutex_leave(db->mutex);
2201 #endif /* SQLITE_OMIT_UTF16 */
2203 #ifndef SQLITE_OMIT_DEPRECATED
2205 ** This function is now an anachronism. It used to be used to recover from a
2206 ** malloc() failure, but SQLite now does this automatically.
2208 int sqlite3_global_recover(void){
2214 ** Test to see whether or not the database connection is in autocommit
2215 ** mode. Return TRUE if it is and FALSE if not. Autocommit mode is on
2216 ** by default. Autocommit is disabled by a BEGIN statement and reenabled
2217 ** by the next COMMIT or ROLLBACK.
2219 ******* THIS IS AN EXPERIMENTAL API AND IS SUBJECT TO CHANGE ******
2221 int sqlite3_get_autocommit(sqlite3 *db){
2222 return db->autoCommit;
2226 ** The following routines are subtitutes for constants SQLITE_CORRUPT,
2227 ** SQLITE_MISUSE, SQLITE_CANTOPEN, SQLITE_IOERR and possibly other error
2228 ** constants. They server two purposes:
2230 ** 1. Serve as a convenient place to set a breakpoint in a debugger
2231 ** to detect when version error conditions occurs.
2233 ** 2. Invoke sqlite3_log() to provide the source code location where
2234 ** a low-level error is first detected.
2236 int sqlite3CorruptError(int lineno){
2237 testcase( sqlite3GlobalConfig.xLog!=0 );
2238 sqlite3_log(SQLITE_CORRUPT,
2239 "database corruption at line %d of [%.10s]",
2240 lineno, 20+sqlite3_sourceid());
2241 return SQLITE_CORRUPT;
2243 int sqlite3MisuseError(int lineno){
2244 testcase( sqlite3GlobalConfig.xLog!=0 );
2245 sqlite3_log(SQLITE_MISUSE,
2246 "misuse at line %d of [%.10s]",
2247 lineno, 20+sqlite3_sourceid());
2248 return SQLITE_MISUSE;
2250 int sqlite3CantopenError(int lineno){
2251 testcase( sqlite3GlobalConfig.xLog!=0 );
2252 sqlite3_log(SQLITE_CANTOPEN,
2253 "cannot open file at line %d of [%.10s]",
2254 lineno, 20+sqlite3_sourceid());
2255 return SQLITE_CANTOPEN;
2259 #ifndef SQLITE_OMIT_DEPRECATED
2261 ** This is a convenience routine that makes sure that all thread-specific
2262 ** data for this thread has been deallocated.
2264 ** SQLite no longer uses thread-specific data so this routine is now a
2265 ** no-op. It is retained for historical compatibility.
2267 void sqlite3_thread_cleanup(void){
2272 ** Return meta information about a specific column of a database table.
2273 ** See comment in sqlite3.h (sqlite.h.in) for details.
2275 #ifdef SQLITE_ENABLE_COLUMN_METADATA
2276 int sqlite3_table_column_metadata(
2277 sqlite3 *db, /* Connection handle */
2278 const char *zDbName, /* Database name or NULL */
2279 const char *zTableName, /* Table name */
2280 const char *zColumnName, /* Column name */
2281 char const **pzDataType, /* OUTPUT: Declared data type */
2282 char const **pzCollSeq, /* OUTPUT: Collation sequence name */
2283 int *pNotNull, /* OUTPUT: True if NOT NULL constraint exists */
2284 int *pPrimaryKey, /* OUTPUT: True if column part of PK */
2285 int *pAutoinc /* OUTPUT: True if column is auto-increment */
2293 char const *zDataType = 0;
2294 char const *zCollSeq = 0;
2299 /* Ensure the database schema has been loaded */
2300 sqlite3_mutex_enter(db->mutex);
2301 sqlite3BtreeEnterAll(db);
2302 rc = sqlite3Init(db, &zErrMsg);
2303 if( SQLITE_OK!=rc ){
2307 /* Locate the table in question */
2308 pTab = sqlite3FindTable(db, zTableName, zDbName);
2309 if( !pTab || pTab->pSelect ){
2314 /* Find the column for which info is requested */
2315 if( sqlite3IsRowid(zColumnName) ){
2318 pCol = &pTab->aCol[iCol];
2321 for(iCol=0; iCol<pTab->nCol; iCol++){
2322 pCol = &pTab->aCol[iCol];
2323 if( 0==sqlite3StrICmp(pCol->zName, zColumnName) ){
2327 if( iCol==pTab->nCol ){
2333 /* The following block stores the meta information that will be returned
2334 ** to the caller in local variables zDataType, zCollSeq, notnull, primarykey
2335 ** and autoinc. At this point there are two possibilities:
2337 ** 1. The specified column name was rowid", "oid" or "_rowid_"
2338 ** and there is no explicitly declared IPK column.
2340 ** 2. The table is not a view and the column name identified an
2341 ** explicitly declared column. Copy meta information from *pCol.
2344 zDataType = pCol->zType;
2345 zCollSeq = pCol->zColl;
2346 notnull = pCol->notNull!=0;
2347 primarykey = pCol->isPrimKey!=0;
2348 autoinc = pTab->iPKey==iCol && (pTab->tabFlags & TF_Autoincrement)!=0;
2350 zDataType = "INTEGER";
2354 zCollSeq = "BINARY";
2358 sqlite3BtreeLeaveAll(db);
2360 /* Whether the function call succeeded or failed, set the output parameters
2361 ** to whatever their local counterparts contain. If an error did occur,
2362 ** this has the effect of zeroing all output parameters.
2364 if( pzDataType ) *pzDataType = zDataType;
2365 if( pzCollSeq ) *pzCollSeq = zCollSeq;
2366 if( pNotNull ) *pNotNull = notnull;
2367 if( pPrimaryKey ) *pPrimaryKey = primarykey;
2368 if( pAutoinc ) *pAutoinc = autoinc;
2370 if( SQLITE_OK==rc && !pTab ){
2371 sqlite3DbFree(db, zErrMsg);
2372 zErrMsg = sqlite3MPrintf(db, "no such table column: %s.%s", zTableName,
2376 sqlite3Error(db, rc, (zErrMsg?"%s":0), zErrMsg);
2377 sqlite3DbFree(db, zErrMsg);
2378 rc = sqlite3ApiExit(db, rc);
2379 sqlite3_mutex_leave(db->mutex);
2385 ** Sleep for a little while. Return the amount of time slept.
2387 int sqlite3_sleep(int ms){
2390 pVfs = sqlite3_vfs_find(0);
2391 if( pVfs==0 ) return 0;
2393 /* This function works in milliseconds, but the underlying OsSleep()
2394 ** API uses microseconds. Hence the 1000's.
2396 rc = (sqlite3OsSleep(pVfs, 1000*ms)/1000);
2401 ** Enable or disable the extended result codes.
2403 int sqlite3_extended_result_codes(sqlite3 *db, int onoff){
2404 sqlite3_mutex_enter(db->mutex);
2405 db->errMask = onoff ? 0xffffffff : 0xff;
2406 sqlite3_mutex_leave(db->mutex);
2411 ** Invoke the xFileControl method on a particular database.
2413 int sqlite3_file_control(sqlite3 *db, const char *zDbName, int op, void *pArg){
2414 int rc = SQLITE_ERROR;
2416 sqlite3_mutex_enter(db->mutex);
2420 for(iDb=0; iDb<db->nDb; iDb++){
2421 if( strcmp(db->aDb[iDb].zName, zDbName)==0 ) break;
2425 Btree *pBtree = db->aDb[iDb].pBt;
2429 sqlite3BtreeEnter(pBtree);
2430 pPager = sqlite3BtreePager(pBtree);
2431 assert( pPager!=0 );
2432 fd = sqlite3PagerFile(pPager);
2434 if( op==SQLITE_FCNTL_FILE_POINTER ){
2435 *(sqlite3_file**)pArg = fd;
2437 }else if( fd->pMethods ){
2438 rc = sqlite3OsFileControl(fd, op, pArg);
2440 rc = SQLITE_NOTFOUND;
2442 sqlite3BtreeLeave(pBtree);
2445 sqlite3_mutex_leave(db->mutex);
2450 ** Interface to the testing logic.
2452 int sqlite3_test_control(int op, ...){
2454 #ifndef SQLITE_OMIT_BUILTIN_TEST
2460 ** Save the current state of the PRNG.
2462 case SQLITE_TESTCTRL_PRNG_SAVE: {
2463 sqlite3PrngSaveState();
2468 ** Restore the state of the PRNG to the last state saved using
2469 ** PRNG_SAVE. If PRNG_SAVE has never before been called, then
2470 ** this verb acts like PRNG_RESET.
2472 case SQLITE_TESTCTRL_PRNG_RESTORE: {
2473 sqlite3PrngRestoreState();
2478 ** Reset the PRNG back to its uninitialized state. The next call
2479 ** to sqlite3_randomness() will reseed the PRNG using a single call
2480 ** to the xRandomness method of the default VFS.
2482 case SQLITE_TESTCTRL_PRNG_RESET: {
2483 sqlite3PrngResetState();
2488 ** sqlite3_test_control(BITVEC_TEST, size, program)
2490 ** Run a test against a Bitvec object of size. The program argument
2491 ** is an array of integers that defines the test. Return -1 on a
2492 ** memory allocation error, 0 on success, or non-zero for an error.
2493 ** See the sqlite3BitvecBuiltinTest() for additional information.
2495 case SQLITE_TESTCTRL_BITVEC_TEST: {
2496 int sz = va_arg(ap, int);
2497 int *aProg = va_arg(ap, int*);
2498 rc = sqlite3BitvecBuiltinTest(sz, aProg);
2503 ** sqlite3_test_control(BENIGN_MALLOC_HOOKS, xBegin, xEnd)
2505 ** Register hooks to call to indicate which malloc() failures
2508 case SQLITE_TESTCTRL_BENIGN_MALLOC_HOOKS: {
2509 typedef void (*void_function)(void);
2510 void_function xBenignBegin;
2511 void_function xBenignEnd;
2512 xBenignBegin = va_arg(ap, void_function);
2513 xBenignEnd = va_arg(ap, void_function);
2514 sqlite3BenignMallocHooks(xBenignBegin, xBenignEnd);
2519 ** sqlite3_test_control(SQLITE_TESTCTRL_PENDING_BYTE, unsigned int X)
2521 ** Set the PENDING byte to the value in the argument, if X>0.
2522 ** Make no changes if X==0. Return the value of the pending byte
2523 ** as it existing before this routine was called.
2525 ** IMPORTANT: Changing the PENDING byte from 0x40000000 results in
2526 ** an incompatible database file format. Changing the PENDING byte
2527 ** while any database connection is open results in undefined and
2528 ** dileterious behavior.
2530 case SQLITE_TESTCTRL_PENDING_BYTE: {
2532 #ifndef SQLITE_OMIT_WSD
2534 unsigned int newVal = va_arg(ap, unsigned int);
2535 if( newVal ) sqlite3PendingByte = newVal;
2542 ** sqlite3_test_control(SQLITE_TESTCTRL_ASSERT, int X)
2544 ** This action provides a run-time test to see whether or not
2545 ** assert() was enabled at compile-time. If X is true and assert()
2546 ** is enabled, then the return value is true. If X is true and
2547 ** assert() is disabled, then the return value is zero. If X is
2548 ** false and assert() is enabled, then the assertion fires and the
2549 ** process aborts. If X is false and assert() is disabled, then the
2550 ** return value is zero.
2552 case SQLITE_TESTCTRL_ASSERT: {
2554 assert( (x = va_arg(ap,int))!=0 );
2561 ** sqlite3_test_control(SQLITE_TESTCTRL_ALWAYS, int X)
2563 ** This action provides a run-time test to see how the ALWAYS and
2564 ** NEVER macros were defined at compile-time.
2566 ** The return value is ALWAYS(X).
2568 ** The recommended test is X==2. If the return value is 2, that means
2569 ** ALWAYS() and NEVER() are both no-op pass-through macros, which is the
2570 ** default setting. If the return value is 1, then ALWAYS() is either
2571 ** hard-coded to true or else it asserts if its argument is false.
2572 ** The first behavior (hard-coded to true) is the case if
2573 ** SQLITE_TESTCTRL_ASSERT shows that assert() is disabled and the second
2574 ** behavior (assert if the argument to ALWAYS() is false) is the case if
2575 ** SQLITE_TESTCTRL_ASSERT shows that assert() is enabled.
2577 ** The run-time test procedure might look something like this:
2579 ** if( sqlite3_test_control(SQLITE_TESTCTRL_ALWAYS, 2)==2 ){
2580 ** // ALWAYS() and NEVER() are no-op pass-through macros
2581 ** }else if( sqlite3_test_control(SQLITE_TESTCTRL_ASSERT, 1) ){
2582 ** // ALWAYS(x) asserts that x is true. NEVER(x) asserts x is false.
2584 ** // ALWAYS(x) is a constant 1. NEVER(x) is a constant 0.
2587 case SQLITE_TESTCTRL_ALWAYS: {
2588 int x = va_arg(ap,int);
2593 /* sqlite3_test_control(SQLITE_TESTCTRL_RESERVE, sqlite3 *db, int N)
2595 ** Set the nReserve size to N for the main database on the database
2598 case SQLITE_TESTCTRL_RESERVE: {
2599 sqlite3 *db = va_arg(ap, sqlite3*);
2600 int x = va_arg(ap,int);
2601 sqlite3_mutex_enter(db->mutex);
2602 sqlite3BtreeSetPageSize(db->aDb[0].pBt, 0, x, 0);
2603 sqlite3_mutex_leave(db->mutex);
2607 /* sqlite3_test_control(SQLITE_TESTCTRL_OPTIMIZATIONS, sqlite3 *db, int N)
2609 ** Enable or disable various optimizations for testing purposes. The
2610 ** argument N is a bitmask of optimizations to be disabled. For normal
2611 ** operation N should be 0. The idea is that a test program (like the
2612 ** SQL Logic Test or SLT test module) can run the same SQL multiple times
2613 ** with various optimizations disabled to verify that the same answer
2614 ** is obtained in every case.
2616 case SQLITE_TESTCTRL_OPTIMIZATIONS: {
2617 sqlite3 *db = va_arg(ap, sqlite3*);
2618 int x = va_arg(ap,int);
2619 db->flags = (x & SQLITE_OptMask) | (db->flags & ~SQLITE_OptMask);
2623 #ifdef SQLITE_N_KEYWORD
2624 /* sqlite3_test_control(SQLITE_TESTCTRL_ISKEYWORD, const char *zWord)
2626 ** If zWord is a keyword recognized by the parser, then return the
2627 ** number of keywords. Or if zWord is not a keyword, return 0.
2629 ** This test feature is only available in the amalgamation since
2630 ** the SQLITE_N_KEYWORD macro is not defined in this file if SQLite
2631 ** is built using separate source files.
2633 case SQLITE_TESTCTRL_ISKEYWORD: {
2634 const char *zWord = va_arg(ap, const char*);
2635 int n = sqlite3Strlen30(zWord);
2636 rc = (sqlite3KeywordCode((u8*)zWord, n)!=TK_ID) ? SQLITE_N_KEYWORD : 0;
2641 /* sqlite3_test_control(SQLITE_TESTCTRL_PGHDRSZ)
2643 ** Return the size of a pcache header in bytes.
2645 case SQLITE_TESTCTRL_PGHDRSZ: {
2650 /* sqlite3_test_control(SQLITE_TESTCTRL_SCRATCHMALLOC, sz, &pNew, pFree);
2652 ** Pass pFree into sqlite3ScratchFree().
2653 ** If sz>0 then allocate a scratch buffer into pNew.
2655 case SQLITE_TESTCTRL_SCRATCHMALLOC: {
2656 void *pFree, **ppNew;
2658 sz = va_arg(ap, int);
2659 ppNew = va_arg(ap, void**);
2660 pFree = va_arg(ap, void*);
2661 if( sz ) *ppNew = sqlite3ScratchMalloc(sz);
2662 sqlite3ScratchFree(pFree);
2668 #endif /* SQLITE_OMIT_BUILTIN_TEST */