diff options
Diffstat (limited to 'chromium/third_party/sqlite/sqlite-src-3240000/src/prepare.c')
| -rw-r--r-- | chromium/third_party/sqlite/sqlite-src-3240000/src/prepare.c | 906 |
1 files changed, 0 insertions, 906 deletions
diff --git a/chromium/third_party/sqlite/sqlite-src-3240000/src/prepare.c b/chromium/third_party/sqlite/sqlite-src-3240000/src/prepare.c deleted file mode 100644 index c745f45a5ab..00000000000 --- a/chromium/third_party/sqlite/sqlite-src-3240000/src/prepare.c +++ /dev/null @@ -1,906 +0,0 @@ -/* -** 2005 May 25 -** -** The author disclaims copyright to this source code. In place of -** a legal notice, here is a blessing: -** -** May you do good and not evil. -** May you find forgiveness for yourself and forgive others. -** May you share freely, never taking more than you give. -** -************************************************************************* -** This file contains the implementation of the sqlite3_prepare() -** interface, and routines that contribute to loading the database schema -** from disk. -*/ -#include "sqliteInt.h" - -/* -** Fill the InitData structure with an error message that indicates -** that the database is corrupt. -*/ -static void corruptSchema( - InitData *pData, /* Initialization context */ - const char *zObj, /* Object being parsed at the point of error */ - const char *zExtra /* Error information */ -){ - sqlite3 *db = pData->db; - if( !db->mallocFailed && (db->flags & SQLITE_WriteSchema)==0 ){ - char *z; - if( zObj==0 ) zObj = "?"; - z = sqlite3MPrintf(db, "malformed database schema (%s)", zObj); - if( zExtra && zExtra[0] ) z = sqlite3MPrintf(db, "%z - %s", z, zExtra); - sqlite3DbFree(db, *pData->pzErrMsg); - *pData->pzErrMsg = z; - } - pData->rc = db->mallocFailed ? SQLITE_NOMEM_BKPT : SQLITE_CORRUPT_BKPT; -} - -/* -** This is the callback routine for the code that initializes the -** database. See sqlite3Init() below for additional information. -** This routine is also called from the OP_ParseSchema opcode of the VDBE. -** -** Each callback contains the following information: -** -** argv[0] = name of thing being created -** argv[1] = root page number for table or index. 0 for trigger or view. -** argv[2] = SQL text for the CREATE statement. -** -*/ -int sqlite3InitCallback(void *pInit, int argc, char **argv, char **NotUsed){ - InitData *pData = (InitData*)pInit; - sqlite3 *db = pData->db; - int iDb = pData->iDb; - - assert( argc==3 ); - UNUSED_PARAMETER2(NotUsed, argc); - assert( sqlite3_mutex_held(db->mutex) ); - DbClearProperty(db, iDb, DB_Empty); - if( db->mallocFailed ){ - corruptSchema(pData, argv[0], 0); - return 1; - } - - assert( iDb>=0 && iDb<db->nDb ); - if( argv==0 ) return 0; /* Might happen if EMPTY_RESULT_CALLBACKS are on */ - if( argv[1]==0 ){ - corruptSchema(pData, argv[0], 0); - }else if( sqlite3_strnicmp(argv[2],"create ",7)==0 ){ - /* Call the parser to process a CREATE TABLE, INDEX or VIEW. - ** But because db->init.busy is set to 1, no VDBE code is generated - ** or executed. All the parser does is build the internal data - ** structures that describe the table, index, or view. - */ - int rc; - u8 saved_iDb = db->init.iDb; - sqlite3_stmt *pStmt; - TESTONLY(int rcp); /* Return code from sqlite3_prepare() */ - - assert( db->init.busy ); - db->init.iDb = iDb; - db->init.newTnum = sqlite3Atoi(argv[1]); - db->init.orphanTrigger = 0; - TESTONLY(rcp = ) sqlite3_prepare(db, argv[2], -1, &pStmt, 0); - rc = db->errCode; - assert( (rc&0xFF)==(rcp&0xFF) ); - db->init.iDb = saved_iDb; - assert( saved_iDb==0 || (db->mDbFlags & DBFLAG_Vacuum)!=0 ); - if( SQLITE_OK!=rc ){ - if( db->init.orphanTrigger ){ - assert( iDb==1 ); - }else{ - pData->rc = rc; - if( rc==SQLITE_NOMEM ){ - sqlite3OomFault(db); - }else if( rc!=SQLITE_INTERRUPT && (rc&0xFF)!=SQLITE_LOCKED ){ - corruptSchema(pData, argv[0], sqlite3_errmsg(db)); - } - } - } - sqlite3_finalize(pStmt); - }else if( argv[0]==0 || (argv[2]!=0 && argv[2][0]!=0) ){ - corruptSchema(pData, argv[0], 0); - }else{ - /* If the SQL column is blank it means this is an index that - ** was created to be the PRIMARY KEY or to fulfill a UNIQUE - ** constraint for a CREATE TABLE. The index should have already - ** been created when we processed the CREATE TABLE. All we have - ** to do here is record the root page number for that index. - */ - Index *pIndex; - pIndex = sqlite3FindIndex(db, argv[0], db->aDb[iDb].zDbSName); - if( pIndex==0 ){ - /* This can occur if there exists an index on a TEMP table which - ** has the same name as another index on a permanent index. Since - ** the permanent table is hidden by the TEMP table, we can also - ** safely ignore the index on the permanent table. - */ - /* Do Nothing */; - }else if( sqlite3GetInt32(argv[1], &pIndex->tnum)==0 ){ - corruptSchema(pData, argv[0], "invalid rootpage"); - } - } - return 0; -} - -/* -** Attempt to read the database schema and initialize internal -** data structures for a single database file. The index of the -** database file is given by iDb. iDb==0 is used for the main -** database. iDb==1 should never be used. iDb>=2 is used for -** auxiliary databases. Return one of the SQLITE_ error codes to -** indicate success or failure. -*/ -static int sqlite3InitOne(sqlite3 *db, int iDb, char **pzErrMsg){ - int rc; - int i; -#ifndef SQLITE_OMIT_DEPRECATED - int size; -#endif - Db *pDb; - char const *azArg[4]; - int meta[5]; - InitData initData; - const char *zMasterName; - int openedTransaction = 0; - - assert( (db->mDbFlags & DBFLAG_SchemaKnownOk)==0 ); - assert( iDb>=0 && iDb<db->nDb ); - assert( db->aDb[iDb].pSchema ); - assert( sqlite3_mutex_held(db->mutex) ); - assert( iDb==1 || sqlite3BtreeHoldsMutex(db->aDb[iDb].pBt) ); - - db->init.busy = 1; - - /* Construct the in-memory representation schema tables (sqlite_master or - ** sqlite_temp_master) by invoking the parser directly. The appropriate - ** table name will be inserted automatically by the parser so we can just - ** use the abbreviation "x" here. The parser will also automatically tag - ** the schema table as read-only. */ - azArg[0] = zMasterName = SCHEMA_TABLE(iDb); - azArg[1] = "1"; - azArg[2] = "CREATE TABLE x(type text,name text,tbl_name text," - "rootpage int,sql text)"; - azArg[3] = 0; - initData.db = db; - initData.iDb = iDb; - initData.rc = SQLITE_OK; - initData.pzErrMsg = pzErrMsg; - sqlite3InitCallback(&initData, 3, (char **)azArg, 0); - if( initData.rc ){ - rc = initData.rc; - goto error_out; - } - - /* Create a cursor to hold the database open - */ - pDb = &db->aDb[iDb]; - if( pDb->pBt==0 ){ - assert( iDb==1 ); - DbSetProperty(db, 1, DB_SchemaLoaded); - rc = SQLITE_OK; - goto error_out; - } - - /* If there is not already a read-only (or read-write) transaction opened - ** on the b-tree database, open one now. If a transaction is opened, it - ** will be closed before this function returns. */ - sqlite3BtreeEnter(pDb->pBt); - if( !sqlite3BtreeIsInReadTrans(pDb->pBt) ){ - rc = sqlite3BtreeBeginTrans(pDb->pBt, 0); - if( rc!=SQLITE_OK ){ - sqlite3SetString(pzErrMsg, db, sqlite3ErrStr(rc)); - goto initone_error_out; - } - openedTransaction = 1; - } - - /* Get the database meta information. - ** - ** Meta values are as follows: - ** meta[0] Schema cookie. Changes with each schema change. - ** meta[1] File format of schema layer. - ** meta[2] Size of the page cache. - ** meta[3] Largest rootpage (auto/incr_vacuum mode) - ** meta[4] Db text encoding. 1:UTF-8 2:UTF-16LE 3:UTF-16BE - ** meta[5] User version - ** meta[6] Incremental vacuum mode - ** meta[7] unused - ** meta[8] unused - ** meta[9] unused - ** - ** Note: The #defined SQLITE_UTF* symbols in sqliteInt.h correspond to - ** the possible values of meta[4]. - */ - for(i=0; i<ArraySize(meta); i++){ - sqlite3BtreeGetMeta(pDb->pBt, i+1, (u32 *)&meta[i]); - } - if( (db->flags & SQLITE_ResetDatabase)!=0 ){ - memset(meta, 0, sizeof(meta)); - } - pDb->pSchema->schema_cookie = meta[BTREE_SCHEMA_VERSION-1]; - - /* If opening a non-empty database, check the text encoding. For the - ** main database, set sqlite3.enc to the encoding of the main database. - ** For an attached db, it is an error if the encoding is not the same - ** as sqlite3.enc. - */ - if( meta[BTREE_TEXT_ENCODING-1] ){ /* text encoding */ - if( iDb==0 ){ -#ifndef SQLITE_OMIT_UTF16 - u8 encoding; - /* If opening the main database, set ENC(db). */ - encoding = (u8)meta[BTREE_TEXT_ENCODING-1] & 3; - if( encoding==0 ) encoding = SQLITE_UTF8; - ENC(db) = encoding; -#else - ENC(db) = SQLITE_UTF8; -#endif - }else{ - /* If opening an attached database, the encoding much match ENC(db) */ - if( meta[BTREE_TEXT_ENCODING-1]!=ENC(db) ){ - sqlite3SetString(pzErrMsg, db, "attached databases must use the same" - " text encoding as main database"); - rc = SQLITE_ERROR; - goto initone_error_out; - } - } - }else{ - DbSetProperty(db, iDb, DB_Empty); - } - pDb->pSchema->enc = ENC(db); - - if( pDb->pSchema->cache_size==0 ){ -#ifndef SQLITE_OMIT_DEPRECATED - size = sqlite3AbsInt32(meta[BTREE_DEFAULT_CACHE_SIZE-1]); - if( size==0 ){ size = SQLITE_DEFAULT_CACHE_SIZE; } - pDb->pSchema->cache_size = size; -#else - pDb->pSchema->cache_size = SQLITE_DEFAULT_CACHE_SIZE; -#endif - sqlite3BtreeSetCacheSize(pDb->pBt, pDb->pSchema->cache_size); - } - - /* - ** file_format==1 Version 3.0.0. - ** file_format==2 Version 3.1.3. // ALTER TABLE ADD COLUMN - ** file_format==3 Version 3.1.4. // ditto but with non-NULL defaults - ** file_format==4 Version 3.3.0. // DESC indices. Boolean constants - */ - pDb->pSchema->file_format = (u8)meta[BTREE_FILE_FORMAT-1]; - if( pDb->pSchema->file_format==0 ){ - pDb->pSchema->file_format = 1; - } - if( pDb->pSchema->file_format>SQLITE_MAX_FILE_FORMAT ){ - sqlite3SetString(pzErrMsg, db, "unsupported file format"); - rc = SQLITE_ERROR; - goto initone_error_out; - } - - /* Ticket #2804: When we open a database in the newer file format, - ** clear the legacy_file_format pragma flag so that a VACUUM will - ** not downgrade the database and thus invalidate any descending - ** indices that the user might have created. - */ - if( iDb==0 && meta[BTREE_FILE_FORMAT-1]>=4 ){ - db->flags &= ~SQLITE_LegacyFileFmt; - } - - /* Read the schema information out of the schema tables - */ - assert( db->init.busy ); - { - char *zSql; - zSql = sqlite3MPrintf(db, - "SELECT name, rootpage, sql FROM \"%w\".%s ORDER BY rowid", - db->aDb[iDb].zDbSName, zMasterName); -#ifndef SQLITE_OMIT_AUTHORIZATION - { - sqlite3_xauth xAuth; - xAuth = db->xAuth; - db->xAuth = 0; -#endif - rc = sqlite3_exec(db, zSql, sqlite3InitCallback, &initData, 0); -#ifndef SQLITE_OMIT_AUTHORIZATION - db->xAuth = xAuth; - } -#endif - if( rc==SQLITE_OK ) rc = initData.rc; - sqlite3DbFree(db, zSql); -#ifndef SQLITE_OMIT_ANALYZE - if( rc==SQLITE_OK ){ - sqlite3AnalysisLoad(db, iDb); - } -#endif - } - if( db->mallocFailed ){ - rc = SQLITE_NOMEM_BKPT; - sqlite3ResetAllSchemasOfConnection(db); - } - if( rc==SQLITE_OK || (db->flags&SQLITE_WriteSchema)){ - /* Black magic: If the SQLITE_WriteSchema flag is set, then consider - ** the schema loaded, even if errors occurred. In this situation the - ** current sqlite3_prepare() operation will fail, but the following one - ** will attempt to compile the supplied statement against whatever subset - ** of the schema was loaded before the error occurred. The primary - ** purpose of this is to allow access to the sqlite_master table - ** even when its contents have been corrupted. - */ - DbSetProperty(db, iDb, DB_SchemaLoaded); - rc = SQLITE_OK; - } - - /* Jump here for an error that occurs after successfully allocating - ** curMain and calling sqlite3BtreeEnter(). For an error that occurs - ** before that point, jump to error_out. - */ -initone_error_out: - if( openedTransaction ){ - sqlite3BtreeCommit(pDb->pBt); - } - sqlite3BtreeLeave(pDb->pBt); - -error_out: - if( rc ){ - if( rc==SQLITE_NOMEM || rc==SQLITE_IOERR_NOMEM ){ - sqlite3OomFault(db); - } - sqlite3ResetOneSchema(db, iDb); - } - db->init.busy = 0; - return rc; -} - -/* -** Initialize all database files - the main database file, the file -** used to store temporary tables, and any additional database files -** created using ATTACH statements. Return a success code. If an -** error occurs, write an error message into *pzErrMsg. -** -** After a database is initialized, the DB_SchemaLoaded bit is set -** bit is set in the flags field of the Db structure. If the database -** file was of zero-length, then the DB_Empty flag is also set. -*/ -int sqlite3Init(sqlite3 *db, char **pzErrMsg){ - int i, rc; - int commit_internal = !(db->mDbFlags&DBFLAG_SchemaChange); - - assert( sqlite3_mutex_held(db->mutex) ); - assert( sqlite3BtreeHoldsMutex(db->aDb[0].pBt) ); - assert( db->init.busy==0 ); - ENC(db) = SCHEMA_ENC(db); - assert( db->nDb>0 ); - /* Do the main schema first */ - if( !DbHasProperty(db, 0, DB_SchemaLoaded) ){ - rc = sqlite3InitOne(db, 0, pzErrMsg); - if( rc ) return rc; - } - /* All other schemas after the main schema. The "temp" schema must be last */ - for(i=db->nDb-1; i>0; i--){ - assert( i==1 || sqlite3BtreeHoldsMutex(db->aDb[i].pBt) ); - if( !DbHasProperty(db, i, DB_SchemaLoaded) ){ - rc = sqlite3InitOne(db, i, pzErrMsg); - if( rc ) return rc; - } - } - if( commit_internal ){ - sqlite3CommitInternalChanges(db); - } - return SQLITE_OK; -} - -/* -** This routine is a no-op if the database schema is already initialized. -** Otherwise, the schema is loaded. An error code is returned. -*/ -int sqlite3ReadSchema(Parse *pParse){ - int rc = SQLITE_OK; - sqlite3 *db = pParse->db; - assert( sqlite3_mutex_held(db->mutex) ); - if( !db->init.busy ){ - rc = sqlite3Init(db, &pParse->zErrMsg); - if( rc!=SQLITE_OK ){ - pParse->rc = rc; - pParse->nErr++; - }else if( db->noSharedCache ){ - db->mDbFlags |= DBFLAG_SchemaKnownOk; - } - } - return rc; -} - - -/* -** Check schema cookies in all databases. If any cookie is out -** of date set pParse->rc to SQLITE_SCHEMA. If all schema cookies -** make no changes to pParse->rc. -*/ -static void schemaIsValid(Parse *pParse){ - sqlite3 *db = pParse->db; - int iDb; - int rc; - int cookie; - - assert( pParse->checkSchema ); - assert( sqlite3_mutex_held(db->mutex) ); - for(iDb=0; iDb<db->nDb; iDb++){ - int openedTransaction = 0; /* True if a transaction is opened */ - Btree *pBt = db->aDb[iDb].pBt; /* Btree database to read cookie from */ - if( pBt==0 ) continue; - - /* If there is not already a read-only (or read-write) transaction opened - ** on the b-tree database, open one now. If a transaction is opened, it - ** will be closed immediately after reading the meta-value. */ - if( !sqlite3BtreeIsInReadTrans(pBt) ){ - rc = sqlite3BtreeBeginTrans(pBt, 0); - if( rc==SQLITE_NOMEM || rc==SQLITE_IOERR_NOMEM ){ - sqlite3OomFault(db); - } - if( rc!=SQLITE_OK ) return; - openedTransaction = 1; - } - - /* Read the schema cookie from the database. If it does not match the - ** value stored as part of the in-memory schema representation, - ** set Parse.rc to SQLITE_SCHEMA. */ - sqlite3BtreeGetMeta(pBt, BTREE_SCHEMA_VERSION, (u32 *)&cookie); - assert( sqlite3SchemaMutexHeld(db, iDb, 0) ); - if( cookie!=db->aDb[iDb].pSchema->schema_cookie ){ - sqlite3ResetOneSchema(db, iDb); - pParse->rc = SQLITE_SCHEMA; - } - - /* Close the transaction, if one was opened. */ - if( openedTransaction ){ - sqlite3BtreeCommit(pBt); - } - } -} - -/* -** Convert a schema pointer into the iDb index that indicates -** which database file in db->aDb[] the schema refers to. -** -** If the same database is attached more than once, the first -** attached database is returned. -*/ -int sqlite3SchemaToIndex(sqlite3 *db, Schema *pSchema){ - int i = -1000000; - - /* If pSchema is NULL, then return -1000000. This happens when code in - ** expr.c is trying to resolve a reference to a transient table (i.e. one - ** created by a sub-select). In this case the return value of this - ** function should never be used. - ** - ** We return -1000000 instead of the more usual -1 simply because using - ** -1000000 as the incorrect index into db->aDb[] is much - ** more likely to cause a segfault than -1 (of course there are assert() - ** statements too, but it never hurts to play the odds). - */ - assert( sqlite3_mutex_held(db->mutex) ); - if( pSchema ){ - for(i=0; 1; i++){ - assert( i<db->nDb ); - if( db->aDb[i].pSchema==pSchema ){ - break; - } - } - assert( i>=0 && i<db->nDb ); - } - return i; -} - -/* -** Free all memory allocations in the pParse object -*/ -void sqlite3ParserReset(Parse *pParse){ - sqlite3 *db = pParse->db; - sqlite3DbFree(db, pParse->aLabel); - sqlite3ExprListDelete(db, pParse->pConstExpr); - if( db ){ - assert( db->lookaside.bDisable >= pParse->disableLookaside ); - db->lookaside.bDisable -= pParse->disableLookaside; - } - pParse->disableLookaside = 0; -} - -/* -** Compile the UTF-8 encoded SQL statement zSql into a statement handle. -*/ -static int sqlite3Prepare( - sqlite3 *db, /* Database handle. */ - const char *zSql, /* UTF-8 encoded SQL statement. */ - int nBytes, /* Length of zSql in bytes. */ - u32 prepFlags, /* Zero or more SQLITE_PREPARE_* flags */ - Vdbe *pReprepare, /* VM being reprepared */ - sqlite3_stmt **ppStmt, /* OUT: A pointer to the prepared statement */ - const char **pzTail /* OUT: End of parsed string */ -){ - char *zErrMsg = 0; /* Error message */ - int rc = SQLITE_OK; /* Result code */ - int i; /* Loop counter */ - Parse sParse; /* Parsing context */ - - memset(&sParse, 0, PARSE_HDR_SZ); - memset(PARSE_TAIL(&sParse), 0, PARSE_TAIL_SZ); - sParse.pReprepare = pReprepare; - assert( ppStmt && *ppStmt==0 ); - /* assert( !db->mallocFailed ); // not true with SQLITE_USE_ALLOCA */ - assert( sqlite3_mutex_held(db->mutex) ); - - /* For a long-term use prepared statement avoid the use of - ** lookaside memory. - */ - if( prepFlags & SQLITE_PREPARE_PERSISTENT ){ - sParse.disableLookaside++; - db->lookaside.bDisable++; - } - - /* Check to verify that it is possible to get a read lock on all - ** database schemas. The inability to get a read lock indicates that - ** some other database connection is holding a write-lock, which in - ** turn means that the other connection has made uncommitted changes - ** to the schema. - ** - ** Were we to proceed and prepare the statement against the uncommitted - ** schema changes and if those schema changes are subsequently rolled - ** back and different changes are made in their place, then when this - ** prepared statement goes to run the schema cookie would fail to detect - ** the schema change. Disaster would follow. - ** - ** This thread is currently holding mutexes on all Btrees (because - ** of the sqlite3BtreeEnterAll() in sqlite3LockAndPrepare()) so it - ** is not possible for another thread to start a new schema change - ** while this routine is running. Hence, we do not need to hold - ** locks on the schema, we just need to make sure nobody else is - ** holding them. - ** - ** Note that setting READ_UNCOMMITTED overrides most lock detection, - ** but it does *not* override schema lock detection, so this all still - ** works even if READ_UNCOMMITTED is set. - */ - for(i=0; i<db->nDb; i++) { - Btree *pBt = db->aDb[i].pBt; - if( pBt ){ - assert( sqlite3BtreeHoldsMutex(pBt) ); - rc = sqlite3BtreeSchemaLocked(pBt); - if( rc ){ - const char *zDb = db->aDb[i].zDbSName; - sqlite3ErrorWithMsg(db, rc, "database schema is locked: %s", zDb); - testcase( db->flags & SQLITE_ReadUncommit ); - goto end_prepare; - } - } - } - - sqlite3VtabUnlockList(db); - - sParse.db = db; - if( nBytes>=0 && (nBytes==0 || zSql[nBytes-1]!=0) ){ - char *zSqlCopy; - int mxLen = db->aLimit[SQLITE_LIMIT_SQL_LENGTH]; - testcase( nBytes==mxLen ); - testcase( nBytes==mxLen+1 ); - if( nBytes>mxLen ){ - sqlite3ErrorWithMsg(db, SQLITE_TOOBIG, "statement too long"); - rc = sqlite3ApiExit(db, SQLITE_TOOBIG); - goto end_prepare; - } - zSqlCopy = sqlite3DbStrNDup(db, zSql, nBytes); - if( zSqlCopy ){ - sqlite3RunParser(&sParse, zSqlCopy, &zErrMsg); - sParse.zTail = &zSql[sParse.zTail-zSqlCopy]; - sqlite3DbFree(db, zSqlCopy); - }else{ - sParse.zTail = &zSql[nBytes]; - } - }else{ - sqlite3RunParser(&sParse, zSql, &zErrMsg); - } - assert( 0==sParse.nQueryLoop ); - - if( sParse.rc==SQLITE_DONE ) sParse.rc = SQLITE_OK; - if( sParse.checkSchema ){ - schemaIsValid(&sParse); - } - if( db->mallocFailed ){ - sParse.rc = SQLITE_NOMEM_BKPT; - } - if( pzTail ){ - *pzTail = sParse.zTail; - } - rc = sParse.rc; - -#ifndef SQLITE_OMIT_EXPLAIN - if( rc==SQLITE_OK && sParse.pVdbe && sParse.explain ){ - static const char * const azColName[] = { - "addr", "opcode", "p1", "p2", "p3", "p4", "p5", "comment", - "id", "parent", "notused", "detail" - }; - int iFirst, mx; - if( sParse.explain==2 ){ - sqlite3VdbeSetNumCols(sParse.pVdbe, 4); - iFirst = 8; - mx = 12; - }else{ - sqlite3VdbeSetNumCols(sParse.pVdbe, 8); - iFirst = 0; - mx = 8; - } - for(i=iFirst; i<mx; i++){ - sqlite3VdbeSetColName(sParse.pVdbe, i-iFirst, COLNAME_NAME, - azColName[i], SQLITE_STATIC); - } - } -#endif - - if( db->init.busy==0 ){ - sqlite3VdbeSetSql(sParse.pVdbe, zSql, (int)(sParse.zTail-zSql), prepFlags); - } - if( sParse.pVdbe && (rc!=SQLITE_OK || db->mallocFailed) ){ - sqlite3VdbeFinalize(sParse.pVdbe); - assert(!(*ppStmt)); - }else{ - *ppStmt = (sqlite3_stmt*)sParse.pVdbe; - } - - if( zErrMsg ){ - sqlite3ErrorWithMsg(db, rc, "%s", zErrMsg); - sqlite3DbFree(db, zErrMsg); - }else{ - sqlite3Error(db, rc); - } - - /* Delete any TriggerPrg structures allocated while parsing this statement. */ - while( sParse.pTriggerPrg ){ - TriggerPrg *pT = sParse.pTriggerPrg; - sParse.pTriggerPrg = pT->pNext; - sqlite3DbFree(db, pT); - } - -end_prepare: - - sqlite3ParserReset(&sParse); - return rc; -} -static int sqlite3LockAndPrepare( - sqlite3 *db, /* Database handle. */ - const char *zSql, /* UTF-8 encoded SQL statement. */ - int nBytes, /* Length of zSql in bytes. */ - u32 prepFlags, /* Zero or more SQLITE_PREPARE_* flags */ - Vdbe *pOld, /* VM being reprepared */ - sqlite3_stmt **ppStmt, /* OUT: A pointer to the prepared statement */ - const char **pzTail /* OUT: End of parsed string */ -){ - int rc; - int cnt = 0; - -#ifdef SQLITE_ENABLE_API_ARMOR - if( ppStmt==0 ) return SQLITE_MISUSE_BKPT; -#endif - *ppStmt = 0; - if( !sqlite3SafetyCheckOk(db)||zSql==0 ){ - return SQLITE_MISUSE_BKPT; - } - sqlite3_mutex_enter(db->mutex); - sqlite3BtreeEnterAll(db); - do{ - /* Make multiple attempts to compile the SQL, until it either succeeds - ** or encounters a permanent error. A schema problem after one schema - ** reset is considered a permanent error. */ - rc = sqlite3Prepare(db, zSql, nBytes, prepFlags, pOld, ppStmt, pzTail); - assert( rc==SQLITE_OK || *ppStmt==0 ); - }while( rc==SQLITE_ERROR_RETRY - || (rc==SQLITE_SCHEMA && (sqlite3ResetOneSchema(db,-1), cnt++)==0) ); - sqlite3BtreeLeaveAll(db); - rc = sqlite3ApiExit(db, rc); - assert( (rc&db->errMask)==rc ); - sqlite3_mutex_leave(db->mutex); - return rc; -} - -/* -** Rerun the compilation of a statement after a schema change. -** -** If the statement is successfully recompiled, return SQLITE_OK. Otherwise, -** if the statement cannot be recompiled because another connection has -** locked the sqlite3_master table, return SQLITE_LOCKED. If any other error -** occurs, return SQLITE_SCHEMA. -*/ -int sqlite3Reprepare(Vdbe *p){ - int rc; - sqlite3_stmt *pNew; - const char *zSql; - sqlite3 *db; - u8 prepFlags; - - assert( sqlite3_mutex_held(sqlite3VdbeDb(p)->mutex) ); - zSql = sqlite3_sql((sqlite3_stmt *)p); - assert( zSql!=0 ); /* Reprepare only called for prepare_v2() statements */ - db = sqlite3VdbeDb(p); - assert( sqlite3_mutex_held(db->mutex) ); - prepFlags = sqlite3VdbePrepareFlags(p); - rc = sqlite3LockAndPrepare(db, zSql, -1, prepFlags, p, &pNew, 0); - if( rc ){ - if( rc==SQLITE_NOMEM ){ - sqlite3OomFault(db); - } - assert( pNew==0 ); - return rc; - }else{ - assert( pNew!=0 ); - } - sqlite3VdbeSwap((Vdbe*)pNew, p); - sqlite3TransferBindings(pNew, (sqlite3_stmt*)p); - sqlite3VdbeResetStepResult((Vdbe*)pNew); - sqlite3VdbeFinalize((Vdbe*)pNew); - return SQLITE_OK; -} - - -/* -** Two versions of the official API. Legacy and new use. In the legacy -** version, the original SQL text is not saved in the prepared statement -** and so if a schema change occurs, SQLITE_SCHEMA is returned by -** sqlite3_step(). In the new version, the original SQL text is retained -** and the statement is automatically recompiled if an schema change -** occurs. -*/ -int sqlite3_prepare( - sqlite3 *db, /* Database handle. */ - const char *zSql, /* UTF-8 encoded SQL statement. */ - int nBytes, /* Length of zSql in bytes. */ - sqlite3_stmt **ppStmt, /* OUT: A pointer to the prepared statement */ - const char **pzTail /* OUT: End of parsed string */ -){ - int rc; - rc = sqlite3LockAndPrepare(db,zSql,nBytes,0,0,ppStmt,pzTail); - assert( rc==SQLITE_OK || ppStmt==0 || *ppStmt==0 ); /* VERIFY: F13021 */ - return rc; -} -int sqlite3_prepare_v2( - sqlite3 *db, /* Database handle. */ - const char *zSql, /* UTF-8 encoded SQL statement. */ - int nBytes, /* Length of zSql in bytes. */ - sqlite3_stmt **ppStmt, /* OUT: A pointer to the prepared statement */ - const char **pzTail /* OUT: End of parsed string */ -){ - int rc; - /* EVIDENCE-OF: R-37923-12173 The sqlite3_prepare_v2() interface works - ** exactly the same as sqlite3_prepare_v3() with a zero prepFlags - ** parameter. - ** - ** Proof in that the 5th parameter to sqlite3LockAndPrepare is 0 */ - rc = sqlite3LockAndPrepare(db,zSql,nBytes,SQLITE_PREPARE_SAVESQL,0, - ppStmt,pzTail); - assert( rc==SQLITE_OK || ppStmt==0 || *ppStmt==0 ); - return rc; -} -int sqlite3_prepare_v3( - sqlite3 *db, /* Database handle. */ - const char *zSql, /* UTF-8 encoded SQL statement. */ - int nBytes, /* Length of zSql in bytes. */ - unsigned int prepFlags, /* Zero or more SQLITE_PREPARE_* flags */ - sqlite3_stmt **ppStmt, /* OUT: A pointer to the prepared statement */ - const char **pzTail /* OUT: End of parsed string */ -){ - int rc; - /* EVIDENCE-OF: R-56861-42673 sqlite3_prepare_v3() differs from - ** sqlite3_prepare_v2() only in having the extra prepFlags parameter, - ** which is a bit array consisting of zero or more of the - ** SQLITE_PREPARE_* flags. - ** - ** Proof by comparison to the implementation of sqlite3_prepare_v2() - ** directly above. */ - rc = sqlite3LockAndPrepare(db,zSql,nBytes, - SQLITE_PREPARE_SAVESQL|(prepFlags&SQLITE_PREPARE_MASK), - 0,ppStmt,pzTail); - assert( rc==SQLITE_OK || ppStmt==0 || *ppStmt==0 ); - return rc; -} - - -#ifndef SQLITE_OMIT_UTF16 -/* -** Compile the UTF-16 encoded SQL statement zSql into a statement handle. -*/ -static int sqlite3Prepare16( - sqlite3 *db, /* Database handle. */ - const void *zSql, /* UTF-16 encoded SQL statement. */ - int nBytes, /* Length of zSql in bytes. */ - u32 prepFlags, /* Zero or more SQLITE_PREPARE_* flags */ - sqlite3_stmt **ppStmt, /* OUT: A pointer to the prepared statement */ - const void **pzTail /* OUT: End of parsed string */ -){ - /* This function currently works by first transforming the UTF-16 - ** encoded string to UTF-8, then invoking sqlite3_prepare(). The - ** tricky bit is figuring out the pointer to return in *pzTail. - */ - char *zSql8; - const char *zTail8 = 0; - int rc = SQLITE_OK; - -#ifdef SQLITE_ENABLE_API_ARMOR - if( ppStmt==0 ) return SQLITE_MISUSE_BKPT; -#endif - *ppStmt = 0; - if( !sqlite3SafetyCheckOk(db)||zSql==0 ){ - return SQLITE_MISUSE_BKPT; - } - if( nBytes>=0 ){ - int sz; - const char *z = (const char*)zSql; - for(sz=0; sz<nBytes && (z[sz]!=0 || z[sz+1]!=0); sz += 2){} - nBytes = sz; - } - sqlite3_mutex_enter(db->mutex); - zSql8 = sqlite3Utf16to8(db, zSql, nBytes, SQLITE_UTF16NATIVE); - if( zSql8 ){ - rc = sqlite3LockAndPrepare(db, zSql8, -1, prepFlags, 0, ppStmt, &zTail8); - } - - if( zTail8 && pzTail ){ - /* If sqlite3_prepare returns a tail pointer, we calculate the - ** equivalent pointer into the UTF-16 string by counting the unicode - ** characters between zSql8 and zTail8, and then returning a pointer - ** the same number of characters into the UTF-16 string. - */ - int chars_parsed = sqlite3Utf8CharLen(zSql8, (int)(zTail8-zSql8)); - *pzTail = (u8 *)zSql + sqlite3Utf16ByteLen(zSql, chars_parsed); - } - sqlite3DbFree(db, zSql8); - rc = sqlite3ApiExit(db, rc); - sqlite3_mutex_leave(db->mutex); - return rc; -} - -/* -** Two versions of the official API. Legacy and new use. In the legacy -** version, the original SQL text is not saved in the prepared statement -** and so if a schema change occurs, SQLITE_SCHEMA is returned by -** sqlite3_step(). In the new version, the original SQL text is retained -** and the statement is automatically recompiled if an schema change -** occurs. -*/ -int sqlite3_prepare16( - sqlite3 *db, /* Database handle. */ - const void *zSql, /* UTF-16 encoded SQL statement. */ - int nBytes, /* Length of zSql in bytes. */ - sqlite3_stmt **ppStmt, /* OUT: A pointer to the prepared statement */ - const void **pzTail /* OUT: End of parsed string */ -){ - int rc; - rc = sqlite3Prepare16(db,zSql,nBytes,0,ppStmt,pzTail); - assert( rc==SQLITE_OK || ppStmt==0 || *ppStmt==0 ); /* VERIFY: F13021 */ - return rc; -} -int sqlite3_prepare16_v2( - sqlite3 *db, /* Database handle. */ - const void *zSql, /* UTF-16 encoded SQL statement. */ - int nBytes, /* Length of zSql in bytes. */ - sqlite3_stmt **ppStmt, /* OUT: A pointer to the prepared statement */ - const void **pzTail /* OUT: End of parsed string */ -){ - int rc; - rc = sqlite3Prepare16(db,zSql,nBytes,SQLITE_PREPARE_SAVESQL,ppStmt,pzTail); - assert( rc==SQLITE_OK || ppStmt==0 || *ppStmt==0 ); /* VERIFY: F13021 */ - return rc; -} -int sqlite3_prepare16_v3( - sqlite3 *db, /* Database handle. */ - const void *zSql, /* UTF-16 encoded SQL statement. */ - int nBytes, /* Length of zSql in bytes. */ - unsigned int prepFlags, /* Zero or more SQLITE_PREPARE_* flags */ - sqlite3_stmt **ppStmt, /* OUT: A pointer to the prepared statement */ - const void **pzTail /* OUT: End of parsed string */ -){ - int rc; - rc = sqlite3Prepare16(db,zSql,nBytes, - SQLITE_PREPARE_SAVESQL|(prepFlags&SQLITE_PREPARE_MASK), - ppStmt,pzTail); - assert( rc==SQLITE_OK || ppStmt==0 || *ppStmt==0 ); /* VERIFY: F13021 */ - return rc; -} - -#endif /* SQLITE_OMIT_UTF16 */ |