main.c.svn-base
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- /*
- ** 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.
- **
- *************************************************************************
- ** Main file for the SQLite library. The routines in this file
- ** implement the programmer interface to the library. Routines in
- ** other files are for internal use by SQLite and should not be
- ** accessed by users of the library.
- **
- ** $Id: main.c,v 1.434 2008/04/16 00:49:12 drh Exp $
- */
- #include "sqliteInt.h"
- #include <ctype.h>
- #ifdef SQLITE_ENABLE_FTS3
- # include "fts3.h"
- #endif
- /*
- ** The version of the library
- */
- const char sqlite3_version[] = SQLITE_VERSION;
- const char *sqlite3_libversion(void){ return sqlite3_version; }
- int sqlite3_libversion_number(void){ return SQLITE_VERSION_NUMBER; }
- int sqlite3_threadsafe(void){ return SQLITE_THREADSAFE; }
- /*
- ** If the following function pointer is not NULL and if
- ** SQLITE_ENABLE_IOTRACE is enabled, then messages describing
- ** I/O active are written using this function. These messages
- ** are intended for debugging activity only.
- */
- void (*sqlite3IoTrace)(const char*, ...) = 0;
- /*
- ** If the following global variable points to a string which is the
- ** name of a directory, then that directory will be used to store
- ** temporary files.
- **
- ** See also the "PRAGMA temp_store_directory" SQL command.
- */
- char *sqlite3_temp_directory = 0;
- /*
- ** Routine needed to support the testcase() macro.
- */
- #ifdef SQLITE_COVERAGE_TEST
- void sqlite3Coverage(int x){
- static int dummy = 0;
- dummy += x;
- }
- #endif
- /*
- ** Return true if the buffer z[0..n-1] contains all spaces.
- */
- static int allSpaces(const char *z, int n){
- while( n>0 && z[n-1]==' ' ){ n--; }
- return n==0;
- }
- /*
- ** This is the default collating function named "BINARY" which is always
- ** available.
- **
- ** If the padFlag argument is not NULL then space padding at the end
- ** of strings is ignored. This implements the RTRIM collation.
- */
- static int binCollFunc(
- void *padFlag,
- int nKey1, const void *pKey1,
- int nKey2, const void *pKey2
- ){
- int rc, n;
- n = nKey1<nKey2 ? nKey1 : nKey2;
- rc = memcmp(pKey1, pKey2, n);
- if( rc==0 ){
- if( padFlag
- && allSpaces(((char*)pKey1)+n, nKey1-n)
- && allSpaces(((char*)pKey2)+n, nKey2-n)
- ){
- /* Leave rc unchanged at 0 */
- }else{
- rc = nKey1 - nKey2;
- }
- }
- return rc;
- }
- /*
- ** Another built-in collating sequence: NOCASE.
- **
- ** This collating sequence is intended to be used for "case independant
- ** comparison". SQLite's knowledge of upper and lower case equivalents
- ** extends only to the 26 characters used in the English language.
- **
- ** At the moment there is only a UTF-8 implementation.
- */
- static int nocaseCollatingFunc(
- void *NotUsed,
- int nKey1, const void *pKey1,
- int nKey2, const void *pKey2
- ){
- int r = sqlite3StrNICmp(
- (const char *)pKey1, (const char *)pKey2, (nKey1<nKey2)?nKey1:nKey2);
- if( 0==r ){
- r = nKey1-nKey2;
- }
- return r;
- }
- /*
- ** Return the ROWID of the most recent insert
- */
- sqlite_int64 sqlite3_last_insert_rowid(sqlite3 *db){
- return db->lastRowid;
- }
- /*
- ** Return the number of changes in the most recent call to sqlite3_exec().
- */
- int sqlite3_changes(sqlite3 *db){
- return db->nChange;
- }
- /*
- ** Return the number of changes since the database handle was opened.
- */
- int sqlite3_total_changes(sqlite3 *db){
- return db->nTotalChange;
- }
- /*
- ** Close an existing SQLite database
- */
- int sqlite3_close(sqlite3 *db){
- HashElem *i;
- int j;
- if( !db ){
- return SQLITE_OK;
- }
- if( !sqlite3SafetyCheckSickOrOk(db) ){
- return SQLITE_MISUSE;
- }
- sqlite3_mutex_enter(db->mutex);
- #ifdef SQLITE_SSE
- {
- extern void sqlite3SseCleanup(sqlite3*);
- sqlite3SseCleanup(db);
- }
- #endif
- sqlite3ResetInternalSchema(db, 0);
- /* If a transaction is open, the ResetInternalSchema() call above
- ** will not have called the xDisconnect() method on any virtual
- ** tables in the db->aVTrans[] array. The following sqlite3VtabRollback()
- ** call will do so. We need to do this before the check for active
- ** SQL statements below, as the v-table implementation may be storing
- ** some prepared statements internally.
- */
- sqlite3VtabRollback(db);
- /* If there are any outstanding VMs, return SQLITE_BUSY. */
- if( db->pVdbe ){
- sqlite3Error(db, SQLITE_BUSY,
- "Unable to close due to unfinalised statements");
- sqlite3_mutex_leave(db->mutex);
- return SQLITE_BUSY;
- }
- assert( sqlite3SafetyCheckSickOrOk(db) );
- for(j=0; j<db->nDb; j++){
- struct Db *pDb = &db->aDb[j];
- if( pDb->pBt ){
- sqlite3BtreeClose(pDb->pBt);
- pDb->pBt = 0;
- if( j!=1 ){
- pDb->pSchema = 0;
- }
- }
- }
- sqlite3ResetInternalSchema(db, 0);
- assert( db->nDb<=2 );
- assert( db->aDb==db->aDbStatic );
- for(i=sqliteHashFirst(&db->aFunc); i; i=sqliteHashNext(i)){
- FuncDef *pFunc, *pNext;
- for(pFunc = (FuncDef*)sqliteHashData(i); pFunc; pFunc=pNext){
- pNext = pFunc->pNext;
- sqlite3_free(pFunc);
- }
- }
- for(i=sqliteHashFirst(&db->aCollSeq); i; i=sqliteHashNext(i)){
- CollSeq *pColl = (CollSeq *)sqliteHashData(i);
- /* Invoke any destructors registered for collation sequence user data. */
- for(j=0; j<3; j++){
- if( pColl[j].xDel ){
- pColl[j].xDel(pColl[j].pUser);
- }
- }
- sqlite3_free(pColl);
- }
- sqlite3HashClear(&db->aCollSeq);
- #ifndef SQLITE_OMIT_VIRTUALTABLE
- for(i=sqliteHashFirst(&db->aModule); i; i=sqliteHashNext(i)){
- Module *pMod = (Module *)sqliteHashData(i);
- if( pMod->xDestroy ){
- pMod->xDestroy(pMod->pAux);
- }
- sqlite3_free(pMod);
- }
- sqlite3HashClear(&db->aModule);
- #endif
- sqlite3HashClear(&db->aFunc);
- sqlite3Error(db, SQLITE_OK, 0); /* Deallocates any cached error strings. */
- if( db->pErr ){
- sqlite3ValueFree(db->pErr);
- }
- sqlite3CloseExtensions(db);
- db->magic = SQLITE_MAGIC_ERROR;
- /* The temp-database schema is allocated differently from the other schema
- ** objects (using sqliteMalloc() directly, instead of sqlite3BtreeSchema()).
- ** So it needs to be freed here. Todo: Why not roll the temp schema into
- ** the same sqliteMalloc() as the one that allocates the database
- ** structure?
- */
- sqlite3_free(db->aDb[1].pSchema);
- sqlite3_mutex_leave(db->mutex);
- db->magic = SQLITE_MAGIC_CLOSED;
- sqlite3_mutex_free(db->mutex);
- sqlite3_free(db);
- return SQLITE_OK;
- }
- /*
- ** Rollback all database files.
- */
- void sqlite3RollbackAll(sqlite3 *db){
- int i;
- int inTrans = 0;
- assert( sqlite3_mutex_held(db->mutex) );
- sqlite3FaultBenign(SQLITE_FAULTINJECTOR_MALLOC, 1);
- for(i=0; i<db->nDb; i++){
- if( db->aDb[i].pBt ){
- if( sqlite3BtreeIsInTrans(db->aDb[i].pBt) ){
- inTrans = 1;
- }
- sqlite3BtreeRollback(db->aDb[i].pBt);
- db->aDb[i].inTrans = 0;
- }
- }
- sqlite3VtabRollback(db);
- sqlite3FaultBenign(SQLITE_FAULTINJECTOR_MALLOC, 0);
- if( db->flags&SQLITE_InternChanges ){
- sqlite3ExpirePreparedStatements(db);
- sqlite3ResetInternalSchema(db, 0);
- }
- /* If one has been configured, invoke the rollback-hook callback */
- if( db->xRollbackCallback && (inTrans || !db->autoCommit) ){
- db->xRollbackCallback(db->pRollbackArg);
- }
- }
- /*
- ** Return a static string that describes the kind of error specified in the
- ** argument.
- */
- const char *sqlite3ErrStr(int rc){
- const char *z;
- switch( rc & 0xff ){
- case SQLITE_ROW:
- case SQLITE_DONE:
- case SQLITE_OK: z = "not an error"; break;
- case SQLITE_ERROR: z = "SQL logic error or missing database"; break;
- case SQLITE_PERM: z = "access permission denied"; break;
- case SQLITE_ABORT: z = "callback requested query abort"; break;
- case SQLITE_BUSY: z = "database is locked"; break;
- case SQLITE_LOCKED: z = "database table is locked"; break;
- case SQLITE_NOMEM: z = "out of memory"; break;
- case SQLITE_READONLY: z = "attempt to write a readonly database"; break;
- case SQLITE_INTERRUPT: z = "interrupted"; break;
- case SQLITE_IOERR: z = "disk I/O error"; break;
- case SQLITE_CORRUPT: z = "database disk image is malformed"; break;
- case SQLITE_FULL: z = "database or disk is full"; break;
- case SQLITE_CANTOPEN: z = "unable to open database file"; break;
- case SQLITE_EMPTY: z = "table contains no data"; break;
- case SQLITE_SCHEMA: z = "database schema has changed"; break;
- case SQLITE_TOOBIG: z = "String or BLOB exceeded size limit"; break;
- case SQLITE_CONSTRAINT: z = "constraint failed"; break;
- case SQLITE_MISMATCH: z = "datatype mismatch"; break;
- case SQLITE_MISUSE: z = "library routine called out of sequence";break;
- case SQLITE_NOLFS: z = "kernel lacks large file support"; break;
- case SQLITE_AUTH: z = "authorization denied"; break;
- case SQLITE_FORMAT: z = "auxiliary database format error"; break;
- case SQLITE_RANGE: z = "bind or column index out of range"; break;
- case SQLITE_NOTADB: z = "file is encrypted or is not a database";break;
- default: z = "unknown error"; break;
- }
- return z;
- }
- /*
- ** This routine implements a busy callback that sleeps and tries
- ** again until a timeout value is reached. The timeout value is
- ** an integer number of milliseconds passed in as the first
- ** argument.
- */
- static int sqliteDefaultBusyCallback(
- void *ptr, /* Database connection */
- int count /* Number of times table has been busy */
- ){
- #if OS_WIN || (defined(HAVE_USLEEP) && HAVE_USLEEP)
- static const u8 delays[] =
- { 1, 2, 5, 10, 15, 20, 25, 25, 25, 50, 50, 100 };
- static const u8 totals[] =
- { 0, 1, 3, 8, 18, 33, 53, 78, 103, 128, 178, 228 };
- # define NDELAY (sizeof(delays)/sizeof(delays[0]))
- sqlite3 *db = (sqlite3 *)ptr;
- int timeout = db->busyTimeout;
- int delay, prior;
- assert( count>=0 );
- if( count < NDELAY ){
- delay = delays[count];
- prior = totals[count];
- }else{
- delay = delays[NDELAY-1];
- prior = totals[NDELAY-1] + delay*(count-(NDELAY-1));
- }
- if( prior + delay > timeout ){
- delay = timeout - prior;
- if( delay<=0 ) return 0;
- }
- sqlite3OsSleep(db->pVfs, delay*1000);
- return 1;
- #else
- sqlite3 *db = (sqlite3 *)ptr;
- int timeout = ((sqlite3 *)ptr)->busyTimeout;
- if( (count+1)*1000 > timeout ){
- return 0;
- }
- sqlite3OsSleep(db->pVfs, 1000000);
- return 1;
- #endif
- }
- /*
- ** Invoke the given busy handler.
- **
- ** This routine is called when an operation failed with a lock.
- ** If this routine returns non-zero, the lock is retried. If it
- ** returns 0, the operation aborts with an SQLITE_BUSY error.
- */
- int sqlite3InvokeBusyHandler(BusyHandler *p){
- int rc;
- if( p==0 || p->xFunc==0 || p->nBusy<0 ) return 0;
- rc = p->xFunc(p->pArg, p->nBusy);
- if( rc==0 ){
- p->nBusy = -1;
- }else{
- p->nBusy++;
- }
- return rc;
- }
- /*
- ** This routine sets the busy callback for an Sqlite database to the
- ** given callback function with the given argument.
- */
- int sqlite3_busy_handler(
- sqlite3 *db,
- int (*xBusy)(void*,int),
- void *pArg
- ){
- sqlite3_mutex_enter(db->mutex);
- db->busyHandler.xFunc = xBusy;
- db->busyHandler.pArg = pArg;
- db->busyHandler.nBusy = 0;
- sqlite3_mutex_leave(db->mutex);
- return SQLITE_OK;
- }
- #ifndef SQLITE_OMIT_PROGRESS_CALLBACK
- /*
- ** This routine sets the progress callback for an Sqlite database to the
- ** given callback function with the given argument. The progress callback will
- ** be invoked every nOps opcodes.
- */
- void sqlite3_progress_handler(
- sqlite3 *db,
- int nOps,
- int (*xProgress)(void*),
- void *pArg
- ){
- if( sqlite3SafetyCheckOk(db) ){
- sqlite3_mutex_enter(db->mutex);
- if( nOps>0 ){
- db->xProgress = xProgress;
- db->nProgressOps = nOps;
- db->pProgressArg = pArg;
- }else{
- db->xProgress = 0;
- db->nProgressOps = 0;
- db->pProgressArg = 0;
- }
- sqlite3_mutex_leave(db->mutex);
- }
- }
- #endif
- /*
- ** This routine installs a default busy handler that waits for the
- ** specified number of milliseconds before returning 0.
- */
- int sqlite3_busy_timeout(sqlite3 *db, int ms){
- if( ms>0 ){
- db->busyTimeout = ms;
- sqlite3_busy_handler(db, sqliteDefaultBusyCallback, (void*)db);
- }else{
- sqlite3_busy_handler(db, 0, 0);
- }
- return SQLITE_OK;
- }
- /*
- ** Cause any pending operation to stop at its earliest opportunity.
- */
- void sqlite3_interrupt(sqlite3 *db){
- if( sqlite3SafetyCheckOk(db) ){
- db->u1.isInterrupted = 1;
- }
- }
- /*
- ** This function is exactly the same as sqlite3_create_function(), except
- ** that it is designed to be called by internal code. The difference is
- ** that if a malloc() fails in sqlite3_create_function(), an error code
- ** is returned and the mallocFailed flag cleared.
- */
- int sqlite3CreateFunc(
- sqlite3 *db,
- const char *zFunctionName,
- int nArg,
- int enc,
- void *pUserData,
- void (*xFunc)(sqlite3_context*,int,sqlite3_value **),
- void (*xStep)(sqlite3_context*,int,sqlite3_value **),
- void (*xFinal)(sqlite3_context*)
- ){
- FuncDef *p;
- int nName;
- assert( sqlite3_mutex_held(db->mutex) );
- if( zFunctionName==0 ||
- (xFunc && (xFinal || xStep)) ||
- (!xFunc && (xFinal && !xStep)) ||
- (!xFunc && (!xFinal && xStep)) ||
- (nArg<-1 || nArg>127) ||
- (255<(nName = strlen(zFunctionName))) ){
- sqlite3Error(db, SQLITE_ERROR, "bad parameters");
- return SQLITE_ERROR;
- }
-
- #ifndef SQLITE_OMIT_UTF16
- /* If SQLITE_UTF16 is specified as the encoding type, transform this
- ** to one of SQLITE_UTF16LE or SQLITE_UTF16BE using the
- ** SQLITE_UTF16NATIVE macro. SQLITE_UTF16 is not used internally.
- **
- ** If SQLITE_ANY is specified, add three versions of the function
- ** to the hash table.
- */
- if( enc==SQLITE_UTF16 ){
- enc = SQLITE_UTF16NATIVE;
- }else if( enc==SQLITE_ANY ){
- int rc;
- rc = sqlite3CreateFunc(db, zFunctionName, nArg, SQLITE_UTF8,
- pUserData, xFunc, xStep, xFinal);
- if( rc==SQLITE_OK ){
- rc = sqlite3CreateFunc(db, zFunctionName, nArg, SQLITE_UTF16LE,
- pUserData, xFunc, xStep, xFinal);
- }
- if( rc!=SQLITE_OK ){
- return rc;
- }
- enc = SQLITE_UTF16BE;
- }
- #else
- enc = SQLITE_UTF8;
- #endif
-
- /* Check if an existing function is being overridden or deleted. If so,
- ** and there are active VMs, then return SQLITE_BUSY. If a function
- ** is being overridden/deleted but there are no active VMs, allow the
- ** operation to continue but invalidate all precompiled statements.
- */
- p = sqlite3FindFunction(db, zFunctionName, nName, nArg, enc, 0);
- if( p && p->iPrefEnc==enc && p->nArg==nArg ){
- if( db->activeVdbeCnt ){
- sqlite3Error(db, SQLITE_BUSY,
- "Unable to delete/modify user-function due to active statements");
- assert( !db->mallocFailed );
- return SQLITE_BUSY;
- }else{
- sqlite3ExpirePreparedStatements(db);
- }
- }
- p = sqlite3FindFunction(db, zFunctionName, nName, nArg, enc, 1);
- assert(p || db->mallocFailed);
- if( !p ){
- return SQLITE_NOMEM;
- }
- p->flags = 0;
- p->xFunc = xFunc;
- p->xStep = xStep;
- p->xFinalize = xFinal;
- p->pUserData = pUserData;
- p->nArg = nArg;
- return SQLITE_OK;
- }
- /*
- ** Create new user functions.
- */
- int sqlite3_create_function(
- sqlite3 *db,
- const char *zFunctionName,
- int nArg,
- int enc,
- void *p,
- void (*xFunc)(sqlite3_context*,int,sqlite3_value **),
- void (*xStep)(sqlite3_context*,int,sqlite3_value **),
- void (*xFinal)(sqlite3_context*)
- ){
- int rc;
- sqlite3_mutex_enter(db->mutex);
- rc = sqlite3CreateFunc(db, zFunctionName, nArg, enc, p, xFunc, xStep, xFinal);
- rc = sqlite3ApiExit(db, rc);
- sqlite3_mutex_leave(db->mutex);
- return rc;
- }
- #ifndef SQLITE_OMIT_UTF16
- int sqlite3_create_function16(
- sqlite3 *db,
- const void *zFunctionName,
- int nArg,
- int eTextRep,
- void *p,
- void (*xFunc)(sqlite3_context*,int,sqlite3_value**),
- void (*xStep)(sqlite3_context*,int,sqlite3_value**),
- void (*xFinal)(sqlite3_context*)
- ){
- int rc;
- char *zFunc8;
- sqlite3_mutex_enter(db->mutex);
- assert( !db->mallocFailed );
- zFunc8 = sqlite3Utf16to8(db, zFunctionName, -1);
- rc = sqlite3CreateFunc(db, zFunc8, nArg, eTextRep, p, xFunc, xStep, xFinal);
- sqlite3_free(zFunc8);
- rc = sqlite3ApiExit(db, rc);
- sqlite3_mutex_leave(db->mutex);
- return rc;
- }
- #endif
- /*
- ** Declare that a function has been overloaded by a virtual table.
- **
- ** If the function already exists as a regular global function, then
- ** this routine is a no-op. If the function does not exist, then create
- ** a new one that always throws a run-time error.
- **
- ** When virtual tables intend to provide an overloaded function, they
- ** should call this routine to make sure the global function exists.
- ** A global function must exist in order for name resolution to work
- ** properly.
- */
- int sqlite3_overload_function(
- sqlite3 *db,
- const char *zName,
- int nArg
- ){
- int nName = strlen(zName);
- int rc;
- sqlite3_mutex_enter(db->mutex);
- if( sqlite3FindFunction(db, zName, nName, nArg, SQLITE_UTF8, 0)==0 ){
- sqlite3CreateFunc(db, zName, nArg, SQLITE_UTF8,
- 0, sqlite3InvalidFunction, 0, 0);
- }
- rc = sqlite3ApiExit(db, SQLITE_OK);
- sqlite3_mutex_leave(db->mutex);
- return rc;
- }
- #ifndef SQLITE_OMIT_TRACE
- /*
- ** Register a trace function. The pArg from the previously registered trace
- ** is returned.
- **
- ** A NULL trace function means that no tracing is executes. A non-NULL
- ** trace is a pointer to a function that is invoked at the start of each
- ** SQL statement.
- */
- void *sqlite3_trace(sqlite3 *db, void (*xTrace)(void*,const char*), void *pArg){
- void *pOld;
- sqlite3_mutex_enter(db->mutex);
- pOld = db->pTraceArg;
- db->xTrace = xTrace;
- db->pTraceArg = pArg;
- sqlite3_mutex_leave(db->mutex);
- return pOld;
- }
- /*
- ** Register a profile function. The pArg from the previously registered
- ** profile function is returned.
- **
- ** A NULL profile function means that no profiling is executes. A non-NULL
- ** profile is a pointer to a function that is invoked at the conclusion of
- ** each SQL statement that is run.
- */
- void *sqlite3_profile(
- sqlite3 *db,
- void (*xProfile)(void*,const char*,sqlite_uint64),
- void *pArg
- ){
- void *pOld;
- sqlite3_mutex_enter(db->mutex);
- pOld = db->pProfileArg;
- db->xProfile = xProfile;
- db->pProfileArg = pArg;
- sqlite3_mutex_leave(db->mutex);
- return pOld;
- }
- #endif /* SQLITE_OMIT_TRACE */
- /*** EXPERIMENTAL ***
- **
- ** Register a function to be invoked when a transaction comments.
- ** If the invoked function returns non-zero, then the commit becomes a
- ** rollback.
- */
- void *sqlite3_commit_hook(
- sqlite3 *db, /* Attach the hook to this database */
- int (*xCallback)(void*), /* Function to invoke on each commit */
- void *pArg /* Argument to the function */
- ){
- void *pOld;
- sqlite3_mutex_enter(db->mutex);
- pOld = db->pCommitArg;
- db->xCommitCallback = xCallback;
- db->pCommitArg = pArg;
- sqlite3_mutex_leave(db->mutex);
- return pOld;
- }
- /*
- ** Register a callback to be invoked each time a row is updated,
- ** inserted or deleted using this database connection.
- */
- void *sqlite3_update_hook(
- sqlite3 *db, /* Attach the hook to this database */
- void (*xCallback)(void*,int,char const *,char const *,sqlite_int64),
- void *pArg /* Argument to the function */
- ){
- void *pRet;
- sqlite3_mutex_enter(db->mutex);
- pRet = db->pUpdateArg;
- db->xUpdateCallback = xCallback;
- db->pUpdateArg = pArg;
- sqlite3_mutex_leave(db->mutex);
- return pRet;
- }
- /*
- ** Register a callback to be invoked each time a transaction is rolled
- ** back by this database connection.
- */
- void *sqlite3_rollback_hook(
- sqlite3 *db, /* Attach the hook to this database */
- void (*xCallback)(void*), /* Callback function */
- void *pArg /* Argument to the function */
- ){
- void *pRet;
- sqlite3_mutex_enter(db->mutex);
- pRet = db->pRollbackArg;
- db->xRollbackCallback = xCallback;
- db->pRollbackArg = pArg;
- sqlite3_mutex_leave(db->mutex);
- return pRet;
- }
- /*
- ** This routine is called to create a connection to a database BTree
- ** driver. If zFilename is the name of a file, then that file is
- ** opened and used. If zFilename is the magic name ":memory:" then
- ** the database is stored in memory (and is thus forgotten as soon as
- ** the connection is closed.) If zFilename is NULL then the database
- ** is a "virtual" database for transient use only and is deleted as
- ** soon as the connection is closed.
- **
- ** A virtual database can be either a disk file (that is automatically
- ** deleted when the file is closed) or it an be held entirely in memory,
- ** depending on the values of the TEMP_STORE compile-time macro and the
- ** db->temp_store variable, according to the following chart:
- **
- ** TEMP_STORE db->temp_store Location of temporary database
- ** ---------- -------------- ------------------------------
- ** 0 any file
- ** 1 1 file
- ** 1 2 memory
- ** 1 0 file
- ** 2 1 file
- ** 2 2 memory
- ** 2 0 memory
- ** 3 any memory
- */
- int sqlite3BtreeFactory(
- const sqlite3 *db, /* Main database when opening aux otherwise 0 */
- const char *zFilename, /* Name of the file containing the BTree database */
- int omitJournal, /* if TRUE then do not journal this file */
- int nCache, /* How many pages in the page cache */
- int vfsFlags, /* Flags passed through to vfsOpen */
- Btree **ppBtree /* Pointer to new Btree object written here */
- ){
- int btFlags = 0;
- int rc;
-
- assert( sqlite3_mutex_held(db->mutex) );
- assert( ppBtree != 0);
- if( omitJournal ){
- btFlags |= BTREE_OMIT_JOURNAL;
- }
- if( db->flags & SQLITE_NoReadlock ){
- btFlags |= BTREE_NO_READLOCK;
- }
- if( zFilename==0 ){
- #if TEMP_STORE==0
- /* Do nothing */
- #endif
- #ifndef SQLITE_OMIT_MEMORYDB
- #if TEMP_STORE==1
- if( db->temp_store==2 ) zFilename = ":memory:";
- #endif
- #if TEMP_STORE==2
- if( db->temp_store!=1 ) zFilename = ":memory:";
- #endif
- #if TEMP_STORE==3
- zFilename = ":memory:";
- #endif
- #endif /* SQLITE_OMIT_MEMORYDB */
- }
- if( (vfsFlags & SQLITE_OPEN_MAIN_DB)!=0 && (zFilename==0 || *zFilename==0) ){
- vfsFlags = (vfsFlags & ~SQLITE_OPEN_MAIN_DB) | SQLITE_OPEN_TEMP_DB;
- }
- rc = sqlite3BtreeOpen(zFilename, (sqlite3 *)db, ppBtree, btFlags, vfsFlags);
- if( rc==SQLITE_OK ){
- sqlite3BtreeSetCacheSize(*ppBtree, nCache);
- }
- return rc;
- }
- /*
- ** Return UTF-8 encoded English language explanation of the most recent
- ** error.
- */
- const char *sqlite3_errmsg(sqlite3 *db){
- const char *z;
- if( !db ){
- return sqlite3ErrStr(SQLITE_NOMEM);
- }
- if( !sqlite3SafetyCheckSickOrOk(db) || db->errCode==SQLITE_MISUSE ){
- return sqlite3ErrStr(SQLITE_MISUSE);
- }
- sqlite3_mutex_enter(db->mutex);
- assert( !db->mallocFailed );
- z = (char*)sqlite3_value_text(db->pErr);
- if( z==0 ){
- z = sqlite3ErrStr(db->errCode);
- }
- sqlite3_mutex_leave(db->mutex);
- return z;
- }
- #ifndef SQLITE_OMIT_UTF16
- /*
- ** Return UTF-16 encoded English language explanation of the most recent
- ** error.
- */
- const void *sqlite3_errmsg16(sqlite3 *db){
- /* Because all the characters in the string are in the unicode
- ** range 0x00-0xFF, if we pad the big-endian string with a
- ** zero byte, we can obtain the little-endian string with
- ** &big_endian[1].
- */
- static const char outOfMemBe[] = {
- 0, 'o', 0, 'u', 0, 't', 0, ' ',
- 0, 'o', 0, 'f', 0, ' ',
- 0, 'm', 0, 'e', 0, 'm', 0, 'o', 0, 'r', 0, 'y', 0, 0, 0
- };
- static const char misuseBe [] = {
- 0, 'l', 0, 'i', 0, 'b', 0, 'r', 0, 'a', 0, 'r', 0, 'y', 0, ' ',
- 0, 'r', 0, 'o', 0, 'u', 0, 't', 0, 'i', 0, 'n', 0, 'e', 0, ' ',
- 0, 'c', 0, 'a', 0, 'l', 0, 'l', 0, 'e', 0, 'd', 0, ' ',
- 0, 'o', 0, 'u', 0, 't', 0, ' ',
- 0, 'o', 0, 'f', 0, ' ',
- 0, 's', 0, 'e', 0, 'q', 0, 'u', 0, 'e', 0, 'n', 0, 'c', 0, 'e', 0, 0, 0
- };
- const void *z;
- if( !db ){
- return (void *)(&outOfMemBe[SQLITE_UTF16NATIVE==SQLITE_UTF16LE?1:0]);
- }
- if( !sqlite3SafetyCheckSickOrOk(db) || db->errCode==SQLITE_MISUSE ){
- return (void *)(&misuseBe[SQLITE_UTF16NATIVE==SQLITE_UTF16LE?1:0]);
- }
- sqlite3_mutex_enter(db->mutex);
- assert( !db->mallocFailed );
- z = sqlite3_value_text16(db->pErr);
- if( z==0 ){
- sqlite3ValueSetStr(db->pErr, -1, sqlite3ErrStr(db->errCode),
- SQLITE_UTF8, SQLITE_STATIC);
- z = sqlite3_value_text16(db->pErr);
- }
- sqlite3ApiExit(0, 0);
- sqlite3_mutex_leave(db->mutex);
- return z;
- }
- #endif /* SQLITE_OMIT_UTF16 */
- /*
- ** Return the most recent error code generated by an SQLite routine. If NULL is
- ** passed to this function, we assume a malloc() failed during sqlite3_open().
- */
- int sqlite3_errcode(sqlite3 *db){
- if( db && !sqlite3SafetyCheckSickOrOk(db) ){
- return SQLITE_MISUSE;
- }
- if( !db || db->mallocFailed ){
- return SQLITE_NOMEM;
- }
- return db->errCode & db->errMask;
- }
- /*
- ** Create a new collating function for database "db". The name is zName
- ** and the encoding is enc.
- */
- static int createCollation(
- sqlite3* db,
- const char *zName,
- int enc,
- void* pCtx,
- int(*xCompare)(void*,int,const void*,int,const void*),
- void(*xDel)(void*)
- ){
- CollSeq *pColl;
- int enc2;
-
- assert( sqlite3_mutex_held(db->mutex) );
- /* If SQLITE_UTF16 is specified as the encoding type, transform this
- ** to one of SQLITE_UTF16LE or SQLITE_UTF16BE using the
- ** SQLITE_UTF16NATIVE macro. SQLITE_UTF16 is not used internally.
- */
- enc2 = enc & ~SQLITE_UTF16_ALIGNED;
- if( enc2==SQLITE_UTF16 ){
- enc2 = SQLITE_UTF16NATIVE;
- }
- if( (enc2&~3)!=0 ){
- sqlite3Error(db, SQLITE_ERROR, "unknown encoding");
- return SQLITE_ERROR;
- }
- /* Check if this call is removing or replacing an existing collation
- ** sequence. If so, and there are active VMs, return busy. If there
- ** are no active VMs, invalidate any pre-compiled statements.
- */
- pColl = sqlite3FindCollSeq(db, (u8)enc2, zName, strlen(zName), 0);
- if( pColl && pColl->xCmp ){
- if( db->activeVdbeCnt ){
- sqlite3Error(db, SQLITE_BUSY,
- "Unable to delete/modify collation sequence due to active statements");
- return SQLITE_BUSY;
- }
- sqlite3ExpirePreparedStatements(db);
- /* If collation sequence pColl was created directly by a call to
- ** sqlite3_create_collation, and not generated by synthCollSeq(),
- ** then any copies made by synthCollSeq() need to be invalidated.
- ** Also, collation destructor - CollSeq.xDel() - function may need
- ** to be called.
- */
- if( (pColl->enc & ~SQLITE_UTF16_ALIGNED)==enc2 ){
- CollSeq *aColl = sqlite3HashFind(&db->aCollSeq, zName, strlen(zName));
- int j;
- for(j=0; j<3; j++){
- CollSeq *p = &aColl[j];
- if( p->enc==pColl->enc ){
- if( p->xDel ){
- p->xDel(p->pUser);
- }
- p->xCmp = 0;
- }
- }
- }
- }
- pColl = sqlite3FindCollSeq(db, (u8)enc2, zName, strlen(zName), 1);
- if( pColl ){
- pColl->xCmp = xCompare;
- pColl->pUser = pCtx;
- pColl->xDel = xDel;
- pColl->enc = enc2 | (enc & SQLITE_UTF16_ALIGNED);
- }
- sqlite3Error(db, SQLITE_OK, 0);
- return SQLITE_OK;
- }
- /*
- ** This array defines hard upper bounds on limit values. The
- ** initializer must be kept in sync with the SQLITE_LIMIT_*
- ** #defines in sqlite3.h.
- */
- static const int aHardLimit[] = {
- SQLITE_MAX_LENGTH,
- SQLITE_MAX_SQL_LENGTH,
- SQLITE_MAX_COLUMN,
- SQLITE_MAX_EXPR_DEPTH,
- SQLITE_MAX_COMPOUND_SELECT,
- SQLITE_MAX_VDBE_OP,
- SQLITE_MAX_FUNCTION_ARG,
- SQLITE_MAX_ATTACHED,
- SQLITE_MAX_LIKE_PATTERN_LENGTH,
- SQLITE_MAX_VARIABLE_NUMBER,
- };
- /*
- ** Make sure the hard limits are set to reasonable values
- */
- #if SQLITE_MAX_LENGTH<100
- # error SQLITE_MAX_LENGTH must be at least 100
- #endif
- #if SQLITE_MAX_SQL_LENGTH<100
- # error SQLITE_MAX_SQL_LENGTH must be at least 100
- #endif
- #if SQLITE_MAX_SQL_LENGTH>SQLITE_MAX_LENGTH
- # error SQLITE_MAX_SQL_LENGTH must not be greater than SQLITE_MAX_LENGTH
- #endif
- #if SQLITE_MAX_COLUMN<1
- # error SQLITE_MAX_COLUMN must be at least 1
- #endif
- #if SQLITE_MAX_EXPR_DEPTH<1
- # error SQLITE_MAX_EXPR_DEPTH must be at least 1
- #endif
- #if SQLITE_MAX_COMPOUND_SELECT<2
- # error SQLITE_MAX_COMPOUND_SELECT must be at least 2
- #endif
- #if SQLITE_MAX_VDBE_OP<40
- # error SQLITE_MAX_VDBE_OP must be at least 40
- #endif
- #if SQLITE_MAX_FUNCTION_ARG<0 || SQLITE_MAX_FUNCTION_ARG>255
- # error SQLITE_MAX_FUNCTION_ARG must be between 0 and 255
- #endif
- #if SQLITE_MAX_ATTACH<0 || SQLITE_MAX_ATTACH>30
- # error SQLITE_MAX_ATTACH must be between 0 and 30
- #endif
- #if SQLITE_MAX_LIKE_PATTERN_LENGTH<1
- # error SQLITE_MAX_LIKE_PATTERN_LENGTH must be at least 1
- #endif
- #if SQLITE_MAX_VARIABLE_NUMBER<1
- # error SQLITE_MAX_VARIABLE_NUMBER must be at least 1
- #endif
- /*
- ** Change the value of a limit. Report the old value.
- ** If an invalid limit index is supplied, report -1.
- ** Make no changes but still report the old value if the
- ** new limit is negative.
- **
- ** A new lower limit does not shrink existing constructs.
- ** It merely prevents new constructs that exceed the limit
- ** from forming.
- */
- int sqlite3_limit(sqlite3 *db, int limitId, int newLimit){
- int oldLimit;
- if( limitId<0 || limitId>=SQLITE_N_LIMIT ){
- return -1;
- }
- oldLimit = db->aLimit[limitId];
- if( newLimit>=0 ){
- if( newLimit>aHardLimit[limitId] ){
- newLimit = aHardLimit[limitId];
- }
- db->aLimit[limitId] = newLimit;
- }
- return oldLimit;
- }
- /*
- ** This routine does the work of opening a database on behalf of
- ** sqlite3_open() and sqlite3_open16(). The database filename "zFilename"
- ** is UTF-8 encoded.
- */
- static int openDatabase(
- const char *zFilename, /* Database filename UTF-8 encoded */
- sqlite3 **ppDb, /* OUT: Returned database handle */
- unsigned flags, /* Operational flags */
- const char *zVfs /* Name of the VFS to use */
- ){
- sqlite3 *db;
- int rc;
- CollSeq *pColl;
- /* Remove harmful bits from the flags parameter */
- flags &= ~( SQLITE_OPEN_DELETEONCLOSE |
- SQLITE_OPEN_MAIN_DB |
- SQLITE_OPEN_TEMP_DB |
- SQLITE_OPEN_TRANSIENT_DB |
- SQLITE_OPEN_MAIN_JOURNAL |
- SQLITE_OPEN_TEMP_JOURNAL |
- SQLITE_OPEN_SUBJOURNAL |
- SQLITE_OPEN_MASTER_JOURNAL
- );
- /* Allocate the sqlite data structure */
- db = sqlite3MallocZero( sizeof(sqlite3) );
- if( db==0 ) goto opendb_out;
- db->mutex = sqlite3_mutex_alloc(SQLITE_MUTEX_RECURSIVE);
- if( db->mutex==0 ){
- sqlite3_free(db);
- db = 0;
- goto opendb_out;
- }
- sqlite3_mutex_enter(db->mutex);
- db->errMask = 0xff;
- db->priorNewRowid = 0;
- db->nDb = 2;
- db->magic = SQLITE_MAGIC_BUSY;
- db->aDb = db->aDbStatic;
- assert( sizeof(db->aLimit)==sizeof(aHardLimit) );
- memcpy(db->aLimit, aHardLimit, sizeof(db->aLimit));
- db->autoCommit = 1;
- db->nextAutovac = -1;
- db->nextPagesize = 0;
- db->flags |= SQLITE_ShortColNames
- #if SQLITE_DEFAULT_FILE_FORMAT<4
- | SQLITE_LegacyFileFmt
- #endif
- #ifdef SQLITE_ENABLE_LOAD_EXTENSION
- | SQLITE_LoadExtension
- #endif
- ;
- sqlite3HashInit(&db->aFunc, SQLITE_HASH_STRING, 0);
- sqlite3HashInit(&db->aCollSeq, SQLITE_HASH_STRING, 0);
- #ifndef SQLITE_OMIT_VIRTUALTABLE
- sqlite3HashInit(&db->aModule, SQLITE_HASH_STRING, 0);
- #endif
- db->pVfs = sqlite3_vfs_find(zVfs);
- if( !db->pVfs ){
- rc = SQLITE_ERROR;
- db->magic = SQLITE_MAGIC_SICK;
- sqlite3Error(db, rc, "no such vfs: %s", zVfs);
- goto opendb_out;
- }
- /* Add the default collation sequence BINARY. BINARY works for both UTF-8
- ** and UTF-16, so add a version for each to avoid any unnecessary
- ** conversions. The only error that can occur here is a malloc() failure.
- */
- createCollation(db, "BINARY", SQLITE_UTF8, 0, binCollFunc, 0);
- createCollation(db, "BINARY", SQLITE_UTF16BE, 0, binCollFunc, 0);
- createCollation(db, "BINARY", SQLITE_UTF16LE, 0, binCollFunc, 0);
- createCollation(db, "RTRIM", SQLITE_UTF8, (void*)1, binCollFunc, 0);
- if( db->mallocFailed ){
- db->magic = SQLITE_MAGIC_SICK;
- goto opendb_out;
- }
- db->pDfltColl = sqlite3FindCollSeq(db, SQLITE_UTF8, "BINARY", 6, 0);
- assert( db->pDfltColl!=0 );
- /* Also add a UTF-8 case-insensitive collation sequence. */
- createCollation(db, "NOCASE", SQLITE_UTF8, 0, nocaseCollatingFunc, 0);
- /* Set flags on the built-in collating sequences */
- db->pDfltColl->type = SQLITE_COLL_BINARY;
- pColl = sqlite3FindCollSeq(db, SQLITE_UTF8, "NOCASE", 6, 0);
- if( pColl ){
- pColl->type = SQLITE_COLL_NOCASE;
- }
- /* Open the backend database driver */
- db->openFlags = flags;
- rc = sqlite3BtreeFactory(db, zFilename, 0, SQLITE_DEFAULT_CACHE_SIZE,
- flags | SQLITE_OPEN_MAIN_DB,
- &db->aDb[0].pBt);
- if( rc!=SQLITE_OK ){
- sqlite3Error(db, rc, 0);
- db->magic = SQLITE_MAGIC_SICK;
- goto opendb_out;
- }
- db->aDb[0].pSchema = sqlite3SchemaGet(db, db->aDb[0].pBt);
- db->aDb[1].pSchema = sqlite3SchemaGet(db, 0);
- /* The default safety_level for the main database is 'full'; for the temp
- ** database it is 'NONE'. This matches the pager layer defaults.
- */
- db->aDb[0].zName = "main";
- db->aDb[0].safety_level = 3;
- #ifndef SQLITE_OMIT_TEMPDB
- db->aDb[1].zName = "temp";
- db->aDb[1].safety_level = 1;
- #endif
- db->magic = SQLITE_MAGIC_OPEN;
- if( db->mallocFailed ){
- goto opendb_out;
- }
- /* Register all built-in functions, but do not attempt to read the
- ** database schema yet. This is delayed until the first time the database
- ** is accessed.
- */
- sqlite3Error(db, SQLITE_OK, 0);
- sqlite3RegisterBuiltinFunctions(db);
- /* Load automatic extensions - extensions that have been registered
- ** using the sqlite3_automatic_extension() API.
- */
- (void)sqlite3AutoLoadExtensions(db);
- if( sqlite3_errcode(db)!=SQLITE_OK ){
- goto opendb_out;
- }
- #ifdef SQLITE_ENABLE_FTS1
- if( !db->mallocFailed ){
- extern int sqlite3Fts1Init(sqlite3*);
- rc = sqlite3Fts1Init(db);
- }
- #endif
- #ifdef SQLITE_ENABLE_FTS2
- if( !db->mallocFailed && rc==SQLITE_OK ){
- extern int sqlite3Fts2Init(sqlite3*);
- rc = sqlite3Fts2Init(db);
- }
- #endif
- #ifdef SQLITE_ENABLE_FTS3
- if( !db->mallocFailed && rc==SQLITE_OK ){
- rc = sqlite3Fts3Init(db);
- }
- #endif
- #ifdef SQLITE_ENABLE_ICU
- if( !db->mallocFailed && rc==SQLITE_OK ){
- extern int sqlite3IcuInit(sqlite3*);
- rc = sqlite3IcuInit(db);
- }
- #endif
- sqlite3Error(db, rc, 0);
- /* -DSQLITE_DEFAULT_LOCKING_MODE=1 makes EXCLUSIVE the default locking
- ** mode. -DSQLITE_DEFAULT_LOCKING_MODE=0 make NORMAL the default locking
- ** mode. Doing nothing at all also makes NORMAL the default.
- */
- #ifdef SQLITE_DEFAULT_LOCKING_MODE
- db->dfltLockMode = SQLITE_DEFAULT_LOCKING_MODE;
- sqlite3PagerLockingMode(sqlite3BtreePager(db->aDb[0].pBt),
- SQLITE_DEFAULT_LOCKING_MODE);
- #endif
- opendb_out:
- if( db ){
- assert( db->mutex!=0 );
- sqlite3_mutex_leave(db->mutex);
- }
- if( SQLITE_NOMEM==(rc = sqlite3_errcode(db)) ){
- sqlite3_close(db);
- db = 0;
- }
- *ppDb = db;
- return sqlite3ApiExit(0, rc);
- }
- /*
- ** Open a new database handle.
- */
- int sqlite3_open(
- const char *zFilename,
- sqlite3 **ppDb
- ){
- return openDatabase(zFilename, ppDb,
- SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE, 0);
- }
- 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 */
- ){
- return openDatabase(filename, ppDb, flags, zVfs);
- }
- #ifndef SQLITE_OMIT_UTF16
- /*
- ** Open a new database handle.
- */
- int sqlite3_open16(
- const void *zFilename,
- sqlite3 **ppDb
- ){
- char const *zFilename8; /* zFilename encoded in UTF-8 instead of UTF-16 */
- sqlite3_value *pVal;
- int rc = SQLITE_NOMEM;
- assert( zFilename );
- assert( ppDb );
- *ppDb = 0;
- pVal = sqlite3ValueNew(0);
- sqlite3ValueSetStr(pVal, -1, zFilename, SQLITE_UTF16NATIVE, SQLITE_STATIC);
- zFilename8 = sqlite3ValueText(pVal, SQLITE_UTF8);
- if( zFilename8 ){
- rc = openDatabase(zFilename8, ppDb,
- SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE, 0);
- assert( *ppDb || rc==SQLITE_NOMEM );
- if( rc==SQLITE_OK ){
- ENC(*ppDb) = SQLITE_UTF16NATIVE;
- if( rc!=SQLITE_OK ){
- sqlite3_close(*ppDb);
- *ppDb = 0;
- }
- }
- }
- sqlite3ValueFree(pVal);
- return sqlite3ApiExit(0, rc);
- }
- #endif /* SQLITE_OMIT_UTF16 */
- /*
- ** Register a new collation sequence with the database handle db.
- */
- int sqlite3_create_collation(
- sqlite3* db,
- const char *zName,
- int enc,
- void* pCtx,
- int(*xCompare)(void*,int,const void*,int,const void*)
- ){
- int rc;
- sqlite3_mutex_enter(db->mutex);
- assert( !db->mallocFailed );
- rc = createCollation(db, zName, enc, pCtx, xCompare, 0);
- rc = sqlite3ApiExit(db, rc);
- sqlite3_mutex_leave(db->mutex);
- return rc;
- }
- /*
- ** Register a new collation sequence with the database handle db.
- */
- int sqlite3_create_collation_v2(
- sqlite3* db,
- const char *zName,
- int enc,
- void* pCtx,
- int(*xCompare)(void*,int,const void*,int,const void*),
- void(*xDel)(void*)
- ){
- int rc;
- sqlite3_mutex_enter(db->mutex);
- assert( !db->mallocFailed );
- rc = createCollation(db, zName, enc, pCtx, xCompare, xDel);
- rc = sqlite3ApiExit(db, rc);
- sqlite3_mutex_leave(db->mutex);
- return rc;
- }
- #ifndef SQLITE_OMIT_UTF16
- /*
- ** Register a new collation sequence with the database handle db.
- */
- int sqlite3_create_collation16(
- sqlite3* db,
- const char *zName,
- int enc,
- void* pCtx,
- int(*xCompare)(void*,int,const void*,int,const void*)
- ){
- int rc = SQLITE_OK;
- char *zName8;
- sqlite3_mutex_enter(db->mutex);
- assert( !db->mallocFailed );
- zName8 = sqlite3Utf16to8(db, zName, -1);
- if( zName8 ){
- rc = createCollation(db, zName8, enc, pCtx, xCompare, 0);
- sqlite3_free(zName8);
- }
- rc = sqlite3ApiExit(db, rc);
- sqlite3_mutex_leave(db->mutex);
- return rc;
- }
- #endif /* SQLITE_OMIT_UTF16 */
- /*
- ** Register a collation sequence factory callback with the database handle
- ** db. Replace any previously installed collation sequence factory.
- */
- int sqlite3_collation_needed(
- sqlite3 *db,
- void *pCollNeededArg,
- void(*xCollNeeded)(void*,sqlite3*,int eTextRep,const char*)
- ){
- sqlite3_mutex_enter(db->mutex);
- db->xCollNeeded = xCollNeeded;
- db->xCollNeeded16 = 0;
- db->pCollNeededArg = pCollNeededArg;
- sqlite3_mutex_leave(db->mutex);
- return SQLITE_OK;
- }
- #ifndef SQLITE_OMIT_UTF16
- /*
- ** Register a collation sequence factory callback with the database handle
- ** db. Replace any previously installed collation sequence factory.
- */
- int sqlite3_collation_needed16(
- sqlite3 *db,
- void *pCollNeededArg,
- void(*xCollNeeded16)(void*,sqlite3*,int eTextRep,const void*)
- ){
- sqlite3_mutex_enter(db->mutex);
- db->xCollNeeded = 0;
- db->xCollNeeded16 = xCollNeeded16;
- db->pCollNeededArg = pCollNeededArg;
- sqlite3_mutex_leave(db->mutex);
- return SQLITE_OK;
- }
- #endif /* SQLITE_OMIT_UTF16 */
- #ifndef SQLITE_OMIT_GLOBALRECOVER
- /*
- ** This function is now an anachronism. It used to be used to recover from a
- ** malloc() failure, but SQLite now does this automatically.
- */
- int sqlite3_global_recover(void){
- return SQLITE_OK;
- }
- #endif
- /*
- ** Test to see whether or not the database connection is in autocommit
- ** mode. Return TRUE if it is and FALSE if not. Autocommit mode is on
- ** by default. Autocommit is disabled by a BEGIN statement and reenabled
- ** by the next COMMIT or ROLLBACK.
- **
- ******* THIS IS AN EXPERIMENTAL API AND IS SUBJECT TO CHANGE ******
- */
- int sqlite3_get_autocommit(sqlite3 *db){
- return db->autoCommit;
- }
- #ifdef SQLITE_DEBUG
- /*
- ** The following routine is subtituted for constant SQLITE_CORRUPT in
- ** debugging builds. This provides a way to set a breakpoint for when
- ** corruption is first detected.
- */
- int sqlite3Corrupt(void){
- return SQLITE_CORRUPT;
- }
- #endif
- /*
- ** This is a convenience routine that makes sure that all thread-specific
- ** data for this thread has been deallocated.
- **
- ** SQLite no longer uses thread-specific data so this routine is now a
- ** no-op. It is retained for historical compatibility.
- */
- void sqlite3_thread_cleanup(void){
- }
- /*
- ** Return meta information about a specific column of a database table.
- ** See comment in sqlite3.h (sqlite.h.in) for details.
- */
- #ifdef SQLITE_ENABLE_COLUMN_METADATA
- int sqlite3_table_column_metadata(
- sqlite3 *db, /* Connection handle */
- const char *zDbName, /* Database name or NULL */
- const char *zTableName, /* Table name */
- const char *zColumnName, /* Column name */
- char const **pzDataType, /* OUTPUT: Declared data type */
- char const **pzCollSeq, /* OUTPUT: Collation sequence name */
- int *pNotNull, /* OUTPUT: True if NOT NULL constraint exists */
- int *pPrimaryKey, /* OUTPUT: True if column part of PK */
- int *pAutoinc /* OUTPUT: True if colums is auto-increment */
- ){
- int rc;
- char *zErrMsg = 0;
- Table *pTab = 0;
- Column *pCol = 0;
- int iCol;
- char const *zDataType = 0;
- char const *zCollSeq = 0;
- int notnull = 0;
- int primarykey = 0;
- int autoinc = 0;
- /* Ensure the database schema has been loaded */
- sqlite3_mutex_enter(db->mutex);
- (void)sqlite3SafetyOn(db);
- sqlite3BtreeEnterAll(db);
- rc = sqlite3Init(db, &zErrMsg);
- sqlite3BtreeLeaveAll(db);
- if( SQLITE_OK!=rc ){
- goto error_out;
- }
- /* Locate the table in question */
- pTab = sqlite3FindTable(db, zTableName, zDbName);
- if( !pTab || pTab->pSelect ){
- pTab = 0;
- goto error_out;
- }
- /* Find the column for which info is requested */
- if( sqlite3IsRowid(zColumnName) ){
- iCol = pTab->iPKey;
- if( iCol>=0 ){
- pCol = &pTab->aCol[iCol];
- }
- }else{
- for(iCol=0; iCol<pTab->nCol; iCol++){
- pCol = &pTab->aCol[iCol];
- if( 0==sqlite3StrICmp(pCol->zName, zColumnName) ){
- break;
- }
- }
- if( iCol==pTab->nCol ){
- pTab = 0;
- goto error_out;
- }
- }
- /* The following block stores the meta information that will be returned
- ** to the caller in local variables zDataType, zCollSeq, notnull, primarykey
- ** and autoinc. At this point there are two possibilities:
- **
- ** 1. The specified column name was rowid", "oid" or "_rowid_"
- ** and there is no explicitly declared IPK column.
- **
- ** 2. The table is not a view and the column name identified an
- ** explicitly declared column. Copy meta information from *pCol.
- */
- if( pCol ){
- zDataType = pCol->zType;
- zCollSeq = pCol->zColl;
- notnull = (pCol->notNull?1:0);
- primarykey = (pCol->isPrimKey?1:0);
- autoinc = ((pTab->iPKey==iCol && pTab->autoInc)?1:0);
- }else{
- zDataType = "INTEGER";
- primarykey = 1;
- }
- if( !zCollSeq ){
- zCollSeq = "BINARY";
- }
- error_out:
- (void)sqlite3SafetyOff(db);
- /* Whether the function call succeeded or failed, set the output parameters
- ** to whatever their local counterparts contain. If an error did occur,
- ** this has the effect of zeroing all output parameters.
- */
- if( pzDataType ) *pzDataType = zDataType;
- if( pzCollSeq ) *pzCollSeq = zCollSeq;
- if( pNotNull ) *pNotNull = notnull;
- if( pPrimaryKey ) *pPrimaryKey = primarykey;
- if( pAutoinc ) *pAutoinc = autoinc;
- if( SQLITE_OK==rc && !pTab ){
- sqlite3SetString(&zErrMsg, "no such table column: ", zTableName, ".",
- zColumnName, 0);
- rc = SQLITE_ERROR;
- }
- sqlite3Error(db, rc, (zErrMsg?"%s":0), zErrMsg);
- sqlite3_free(zErrMsg);
- rc = sqlite3ApiExit(db, rc);
- sqlite3_mutex_leave(db->mutex);
- return rc;
- }
- #endif
- /*
- ** Sleep for a little while. Return the amount of time slept.
- */
- int sqlite3_sleep(int ms){
- sqlite3_vfs *pVfs;
- int rc;
- pVfs = sqlite3_vfs_find(0);
- /* This function works in milliseconds, but the underlying OsSleep()
- ** API uses microseconds. Hence the 1000's.
- */
- rc = (sqlite3OsSleep(pVfs, 1000*ms)/1000);
- return rc;
- }
- /*
- ** Enable or disable the extended result codes.
- */
- int sqlite3_extended_result_codes(sqlite3 *db, int onoff){
- sqlite3_mutex_enter(db->mutex);
- db->errMask = onoff ? 0xffffffff : 0xff;
- sqlite3_mutex_leave(db->mutex);
- return SQLITE_OK;
- }
- /*
- ** Invoke the xFileControl method on a particular database.
- */
- int sqlite3_file_control(sqlite3 *db, const char *zDbName, int op, void *pArg){
- int rc = SQLITE_ERROR;
- int iDb;
- sqlite3_mutex_enter(db->mutex);
- if( zDbName==0 ){
- iDb = 0;
- }else{
- for(iDb=0; iDb<db->nDb; iDb++){
- if( strcmp(db->aDb[iDb].zName, zDbName)==0 ) break;
- }
- }
- if( iDb<db->nDb ){
- Btree *pBtree = db->aDb[iDb].pBt;
- if( pBtree ){
- Pager *pPager;
- sqlite3_file *fd;
- sqlite3BtreeEnter(pBtree);
- pPager = sqlite3BtreePager(pBtree);
- assert( pPager!=0 );
- fd = sqlite3PagerFile(pPager);
- assert( fd!=0 );
- if( fd->pMethods ){
- rc = sqlite3OsFileControl(fd, op, pArg);
- }
- sqlite3BtreeLeave(pBtree);
- }
- }
- sqlite3_mutex_leave(db->mutex);
- return rc;
- }
- /*
- ** Interface to the testing logic.
- */
- int sqlite3_test_control(int op, ...){
- int rc = 0;
- #ifndef SQLITE_OMIT_BUILTIN_TEST
- va_list ap;
- va_start(ap, op);
- switch( op ){
- /*
- ** sqlite3_test_control(FAULT_CONFIG, fault_id, nDelay, nRepeat)
- **
- ** Configure a fault injector. The specific fault injector is
- ** identified by the fault_id argument. (ex: SQLITE_FAULTINJECTOR_MALLOC)
- ** The fault will occur after a delay of nDelay calls. The fault
- ** will repeat nRepeat times.
- */
- case SQLITE_TESTCTRL_FAULT_CONFIG: {
- int id = va_arg(ap, int);
- int nDelay = va_arg(ap, int);
- int nRepeat = va_arg(ap, int);
- sqlite3FaultConfig(id, nDelay, nRepeat);
- break;
- }
- /*
- ** sqlite3_test_control(FAULT_FAILURES, fault_id)
- **
- ** Return the number of faults (both hard and benign faults) that have
- ** occurred since the injector identified by fault_id) was last configured.
- */
- case SQLITE_TESTCTRL_FAULT_FAILURES: {
- int id = va_arg(ap, int);
- rc = sqlite3FaultFailures(id);
- break;
- }
- /*
- ** sqlite3_test_control(FAULT_BENIGN_FAILURES, fault_id)
- **
- ** Return the number of benign faults that have occurred since the
- ** injector identified by fault_id was last configured.
- */
- case SQLITE_TESTCTRL_FAULT_BENIGN_FAILURES: {
- int id = va_arg(ap, int);
- rc = sqlite3FaultBenignFailures(id);
- break;
- }
- /*
- ** sqlite3_test_control(FAULT_PENDING, fault_id)
- **
- ** Return the number of successes that will occur before the next
- ** scheduled failure on fault injector fault_id.
- ** If no failures are scheduled, return -1.
- */
- case SQLITE_TESTCTRL_FAULT_PENDING: {
- int id = va_arg(ap, int);
- rc = sqlite3FaultPending(id);
- break;
- }
- /*
- ** Save the current state of the PRNG.
- */
- case SQLITE_TESTCTRL_PRNG_SAVE: {
- sqlite3PrngSaveState();
- break;
- }
- /*
- ** Restore the state of the PRNG to the last state saved using
- ** PRNG_SAVE. If PRNG_SAVE has never before been called, then
- ** this verb acts like PRNG_RESET.
- */
- case SQLITE_TESTCTRL_PRNG_RESTORE: {
- sqlite3PrngRestoreState();
- break;
- }
- /*
- ** Reset the PRNG back to its uninitialized state. The next call
- ** to sqlite3_randomness() will reseed the PRNG using a single call
- ** to the xRandomness method of the default VFS.
- */
- case SQLITE_TESTCTRL_PRNG_RESET: {
- sqlite3PrngResetState();
- break;
- }
- /*
- ** sqlite3_test_control(BITVEC_TEST, size, program)
- **
- ** Run a test against a Bitvec object of size. The program argument
- ** is an array of integers that defines the test. Return -1 on a
- ** memory allocation error, 0 on success, or non-zero for an error.
- ** See the sqlite3BitvecBuiltinTest() for additional information.
- */
- case SQLITE_TESTCTRL_BITVEC_TEST: {
- int sz = va_arg(ap, int);
- int *aProg = va_arg(ap, int*);
- rc = sqlite3BitvecBuiltinTest(sz, aProg);
- break;
- }
- }
- va_end(ap);
- #endif /* SQLITE_OMIT_BUILTIN_TEST */
- return rc;
- }