/* ** This routine is a no-op if the database schema is already initialised. ** Otherwise, the schema is loaded. An error code is returned. */ int sqlite3ReadSchema(Parse *pParse){ int rc = SQLITE_OK; sqlite3 *db = pParse->db; if( !db->init.busy ){ rc = sqlite3Init(db, &pParse->zErrMsg); } if( rc!=SQLITE_OK ){ pParse->rc = rc; pParse->nErr++; } return rc; }
/* ** This routine is a no-op if the database schema is already initialised. ** Otherwise, the schema is loaded. An error code is returned. */ int sqlite3ReadSchema(Parse *pParse){ int rc = SQLITE_OK; sqlite3 *db = pParse->db; if( !db->init.busy ){ if( (db->flags & SQLITE_Initialized)==0 ){ rc = sqlite3Init(db, &pParse->zErrMsg); } } assert( rc!=SQLITE_OK || (db->flags & SQLITE_Initialized)||db->init.busy ); if( rc!=SQLITE_OK ){ pParse->rc = rc; pParse->nErr++; } return rc; }
/* ** This routine implements the OP_Vacuum opcode of the VDBE. */ int sqlite3RunVacuum(char **pzErrMsg, sqlite3 *db) { int rc; Btree *p; p = db->aDb[0].pBt; rc = SQLITE_OK; if (p->pBt->dbStorage != DB_STORE_NAMED) return SQLITE_OK; if ((rc = sqlite3Init(db, pzErrMsg)) != SQLITE_OK) return rc; if (!db->autoCommit) { sqlite3SetString(pzErrMsg, db, "cannot VACUUM from within a transaction"); return SQLITE_ERROR; } assert(sqlite3_mutex_held(db->mutex)); rc = btreeVacuum(p, pzErrMsg); return rc; }
/* ** An SQL user-function registered to do the work of an ATTACH statement. The ** three arguments to the function come directly from an attach statement: ** ** ATTACH DATABASE x AS y KEY z ** ** SELECT sqlite_attach(x, y, z) ** ** If the optional "KEY z" syntax is omitted, an SQL NULL is passed as the ** third argument. */ static void attachFunc( sqlite3_context *context, int NotUsed, sqlite3_value **argv ){ int i; int rc = 0; sqlite3 *db = sqlite3_context_db_handle(context); const char *zName; const char *zFile; Db *aNew; char *zErrDyn = 0; UNUSED_PARAMETER(NotUsed); zFile = (const char *)sqlite3_value_text(argv[0]); zName = (const char *)sqlite3_value_text(argv[1]); if( zFile==0 ) zFile = ""; if( zName==0 ) zName = ""; /* Check for the following errors: ** ** * Too many attached databases, ** * Transaction currently open ** * Specified database name already being used. */ if( db->nDb>=db->aLimit[SQLITE_LIMIT_ATTACHED]+2 ){ zErrDyn = sqlite3MPrintf(db, "too many attached databases - max %d", db->aLimit[SQLITE_LIMIT_ATTACHED] ); goto attach_error; } if( !db->autoCommit ){ zErrDyn = sqlite3MPrintf(db, "cannot ATTACH database within transaction"); goto attach_error; } for(i=0; i<db->nDb; i++){ char *z = db->aDb[i].zName; assert( z && zName ); if( sqlite3StrICmp(z, zName)==0 ){ zErrDyn = sqlite3MPrintf(db, "database %s is already in use", zName); goto attach_error; } } /* Allocate the new entry in the db->aDb[] array and initialise the schema ** hash tables. */ if( db->aDb==db->aDbStatic ){ aNew = sqlite3DbMallocRaw(db, sizeof(db->aDb[0])*3 ); if( aNew==0 ) return; memcpy(aNew, db->aDb, sizeof(db->aDb[0])*2); }else{ aNew = sqlite3DbRealloc(db, db->aDb, sizeof(db->aDb[0])*(db->nDb+1) ); if( aNew==0 ) return; } db->aDb = aNew; aNew = &db->aDb[db->nDb]; memset(aNew, 0, sizeof(*aNew)); /* Open the database file. If the btree is successfully opened, use ** it to obtain the database schema. At this point the schema may ** or may not be initialised. */ rc = sqlite3BtreeFactory(db, zFile, 0, SQLITE_DEFAULT_CACHE_SIZE, db->openFlags | SQLITE_OPEN_MAIN_DB, &aNew->pBt); db->nDb++; if( rc==SQLITE_CONSTRAINT ){ rc = SQLITE_ERROR; zErrDyn = sqlite3MPrintf(db, "database is already attached"); }else if( rc==SQLITE_OK ){ Pager *pPager; aNew->pSchema = sqlite3SchemaGet(db, aNew->pBt); if( !aNew->pSchema ){ rc = SQLITE_NOMEM; }else if( aNew->pSchema->file_format && aNew->pSchema->enc!=ENC(db) ){ zErrDyn = sqlite3MPrintf(db, "attached databases must use the same text encoding as main database"); rc = SQLITE_ERROR; } pPager = sqlite3BtreePager(aNew->pBt); sqlite3PagerLockingMode(pPager, db->dfltLockMode); sqlite3PagerJournalMode(pPager, db->dfltJournalMode); } aNew->zName = sqlite3DbStrDup(db, zName); aNew->safety_level = 3; #if SQLITE_HAS_CODEC { extern int sqlite3CodecAttach(sqlite3*, int, const void*, int); extern void sqlite3CodecGetKey(sqlite3*, int, void**, int*); int nKey; char *zKey; int t = sqlite3_value_type(argv[2]); switch( t ){ case SQLITE_INTEGER: case SQLITE_FLOAT: zErrDyn = sqlite3DbStrDup(db, "Invalid key value"); rc = SQLITE_ERROR; break; case SQLITE_TEXT: case SQLITE_BLOB: nKey = sqlite3_value_bytes(argv[2]); zKey = (char *)sqlite3_value_blob(argv[2]); sqlite3CodecAttach(db, db->nDb-1, zKey, nKey); break; case SQLITE_NULL: /* No key specified. Use the key from the main database */ sqlite3CodecGetKey(db, 0, (void**)&zKey, &nKey); sqlite3CodecAttach(db, db->nDb-1, zKey, nKey); break; } } #endif /* If the file was opened successfully, read the schema for the new database. ** If this fails, or if opening the file failed, then close the file and ** remove the entry from the db->aDb[] array. i.e. put everything back the way ** we found it. */ if( rc==SQLITE_OK ){ (void)sqlite3SafetyOn(db); sqlite3BtreeEnterAll(db); rc = sqlite3Init(db, &zErrDyn); sqlite3BtreeLeaveAll(db); (void)sqlite3SafetyOff(db); } if( rc ){ int iDb = db->nDb - 1; assert( iDb>=2 ); if( db->aDb[iDb].pBt ){ sqlite3BtreeClose(db->aDb[iDb].pBt); db->aDb[iDb].pBt = 0; db->aDb[iDb].pSchema = 0; } sqlite3ResetInternalSchema(db, 0); db->nDb = iDb; if( rc==SQLITE_NOMEM || rc==SQLITE_IOERR_NOMEM ){ db->mallocFailed = 1; sqlite3DbFree(db, zErrDyn); zErrDyn = sqlite3MPrintf(db, "out of memory"); }else if( zErrDyn==0 ){ zErrDyn = sqlite3MPrintf(db, "unable to open database: %s", zFile); } goto attach_error; } return; attach_error: /* Return an error if we get here */ if( zErrDyn ){ sqlite3_result_error(context, zErrDyn, -1); sqlite3DbFree(db, zErrDyn); } if( rc ) sqlite3_result_error_code(context, rc); }
/* ** An SQL user-function registered to do the work of an ATTACH statement. The ** three arguments to the function come directly from an attach statement: ** ** ATTACH DATABASE x AS y KEY z ** ** SELECT sqlite_attach(x, y, z) ** ** If the optional "KEY z" syntax is omitted, an SQL NULL is passed as the ** third argument. */ static void attachFunc( sqlite3_context *context, int argc, sqlite3_value **argv ){ int i; int rc = 0; sqlite3 *db = sqlite3_user_data(context); const char *zName; const char *zFile; Db *aNew; char zErr[128]; char *zErrDyn = 0; zFile = (const char *)sqlite3_value_text(argv[0]); zName = (const char *)sqlite3_value_text(argv[1]); /* Check for the following errors: ** ** * Too many attached databases, ** * Transaction currently open ** * Specified database name already being used. */ if( db->nDb>=MAX_ATTACHED+2 ){ sqlite3_snprintf( 127, zErr, "too many attached databases - max %d", MAX_ATTACHED ); goto attach_error; } if( !db->autoCommit ){ strcpy(zErr, "cannot ATTACH database within transaction"); goto attach_error; } for(i=0; i<db->nDb; i++){ char *z = db->aDb[i].zName; if( z && sqlite3StrICmp(z, zName)==0 ){ sqlite3_snprintf(127, zErr, "database %s is already in use", zName); goto attach_error; } } /* Allocate the new entry in the db->aDb[] array and initialise the schema ** hash tables. */ if( db->aDb==db->aDbStatic ){ aNew = sqliteMalloc( sizeof(db->aDb[0])*3 ); if( aNew==0 ){ return; } memcpy(aNew, db->aDb, sizeof(db->aDb[0])*2); }else{ aNew = sqliteRealloc(db->aDb, sizeof(db->aDb[0])*(db->nDb+1) ); if( aNew==0 ){ return; } } db->aDb = aNew; aNew = &db->aDb[db->nDb++]; memset(aNew, 0, sizeof(*aNew)); /* Open the database file. If the btree is successfully opened, use ** it to obtain the database schema. At this point the schema may ** or may not be initialised. */ rc = sqlite3BtreeFactory(db, zFile, 0, MAX_PAGES, &aNew->pBt); if( rc==SQLITE_OK ){ aNew->pSchema = sqlite3SchemaGet(aNew->pBt); if( !aNew->pSchema ){ rc = SQLITE_NOMEM; }else if( aNew->pSchema->file_format && aNew->pSchema->enc!=ENC(db) ){ strcpy(zErr, "attached databases must use the same text encoding as main database"); goto attach_error; } } aNew->zName = sqliteStrDup(zName); aNew->safety_level = 3; #if SQLITE_HAS_CODEC { extern int sqlite3CodecAttach(sqlite3*, int, void*, int); extern void sqlite3CodecGetKey(sqlite3*, int, void**, int*); int nKey; char *zKey; int t = sqlite3_value_type(argv[2]); switch( t ){ case SQLITE_INTEGER: case SQLITE_FLOAT: zErrDyn = sqliteStrDup("Invalid key value"); rc = SQLITE_ERROR; break; case SQLITE_TEXT: case SQLITE_BLOB: nKey = sqlite3_value_bytes(argv[2]); zKey = (char *)sqlite3_value_blob(argv[2]); sqlite3CodecAttach(db, db->nDb-1, zKey, nKey); break; case SQLITE_NULL: /* No key specified. Use the key from the main database */ sqlite3CodecGetKey(db, 0, (void**)&zKey, &nKey); sqlite3CodecAttach(db, db->nDb-1, zKey, nKey); break; } } #endif /* If the file was opened successfully, read the schema for the new database. ** If this fails, or if opening the file failed, then close the file and ** remove the entry from the db->aDb[] array. i.e. put everything back the way ** we found it. */ if( rc==SQLITE_OK ){ sqlite3SafetyOn(db); rc = sqlite3Init(db, &zErrDyn); sqlite3SafetyOff(db); } if( rc ){ int i = db->nDb - 1; assert( i>=2 ); if( db->aDb[i].pBt ){ sqlite3BtreeClose(db->aDb[i].pBt); db->aDb[i].pBt = 0; db->aDb[i].pSchema = 0; } sqlite3ResetInternalSchema(db, 0); db->nDb = i; sqlite3_snprintf(127, zErr, "unable to open database: %s", zFile); goto attach_error; } return; attach_error: /* Return an error if we get here */ if( zErrDyn ){ sqlite3_result_error(context, zErrDyn, -1); sqliteFree(zErrDyn); }else{ zErr[sizeof(zErr)-1] = 0; sqlite3_result_error(context, zErr, -1); } }
/* ** An SQL user-function registered to do the work of an ATTACH statement. The ** three arguments to the function come directly from an attach statement: ** ** ATTACH DATABASE x AS y KEY z ** ** SELECT sqlite_attach(x, y, z) ** ** If the optional "KEY z" syntax is omitted, an SQL NULL is passed as the ** third argument. */ static void attachFunc( sqlite3_context *context, int NotUsed, sqlite3_value **argv ){ int i; int rc = 0; sqlite3 *db = sqlite3_context_db_handle(context); const char *zName; const char *zFile; char *zPath = 0; char *zErr = 0; unsigned int flags; Db *aNew; char *zErrDyn = 0; sqlite3_vfs *pVfs; UNUSED_PARAMETER(NotUsed); zFile = (const char *)sqlite3_value_text(argv[0]); zName = (const char *)sqlite3_value_text(argv[1]); if( zFile==0 ) zFile = ""; if( zName==0 ) zName = ""; /* Check for the following errors: ** ** * Too many attached databases, ** * Transaction currently open ** * Specified database name already being used. */ if( db->nDb>=db->aLimit[SQLITE_LIMIT_ATTACHED]+2 ){ zErrDyn = sqlite3MPrintf(db, "too many attached databases - max %d", db->aLimit[SQLITE_LIMIT_ATTACHED] ); goto attach_error; } if( !db->autoCommit ){ zErrDyn = sqlite3MPrintf(db, "cannot ATTACH database within transaction"); goto attach_error; } for(i=0; i<db->nDb; i++){ char *z = db->aDb[i].zName; assert( z && zName ); if( sqlite3StrICmp(z, zName)==0 ){ zErrDyn = sqlite3MPrintf(db, "database %s is already in use", zName); goto attach_error; } } /* Allocate the new entry in the db->aDb[] array and initialize the schema ** hash tables. */ if( db->aDb==db->aDbStatic ){ aNew = sqlite3DbMallocRawNN(db, sizeof(db->aDb[0])*3 ); if( aNew==0 ) return; memcpy(aNew, db->aDb, sizeof(db->aDb[0])*2); }else{ aNew = sqlite3DbRealloc(db, db->aDb, sizeof(db->aDb[0])*(db->nDb+1) ); if( aNew==0 ) return; } db->aDb = aNew; aNew = &db->aDb[db->nDb]; memset(aNew, 0, sizeof(*aNew)); /* Open the database file. If the btree is successfully opened, use ** it to obtain the database schema. At this point the schema may ** or may not be initialized. */ flags = db->openFlags; rc = sqlite3ParseUri(db->pVfs->zName, zFile, &flags, &pVfs, &zPath, &zErr); if( rc!=SQLITE_OK ){ if( rc==SQLITE_NOMEM ) sqlite3OomFault(db); sqlite3_result_error(context, zErr, -1); sqlite3_free(zErr); return; } assert( pVfs ); flags |= SQLITE_OPEN_MAIN_DB; rc = sqlite3BtreeOpen(pVfs, zPath, db, &aNew->pBt, 0, flags); sqlite3_free( zPath ); db->nDb++; if( rc==SQLITE_CONSTRAINT ){ rc = SQLITE_ERROR; zErrDyn = sqlite3MPrintf(db, "database is already attached"); }else if( rc==SQLITE_OK ){ Pager *pPager; aNew->pSchema = sqlite3SchemaGet(db, aNew->pBt); if( !aNew->pSchema ){ rc = SQLITE_NOMEM; }else if( aNew->pSchema->file_format && aNew->pSchema->enc!=ENC(db) ){ zErrDyn = sqlite3MPrintf(db, "attached databases must use the same text encoding as main database"); rc = SQLITE_ERROR; } sqlite3BtreeEnter(aNew->pBt); pPager = sqlite3BtreePager(aNew->pBt); sqlite3PagerLockingMode(pPager, db->dfltLockMode); sqlite3BtreeSecureDelete(aNew->pBt, sqlite3BtreeSecureDelete(db->aDb[0].pBt,-1) ); #ifndef SQLITE_OMIT_PAGER_PRAGMAS sqlite3BtreeSetPagerFlags(aNew->pBt, PAGER_SYNCHRONOUS_FULL | (db->flags & PAGER_FLAGS_MASK)); #endif sqlite3BtreeLeave(aNew->pBt); } aNew->safety_level = 3; aNew->zName = sqlite3DbStrDup(db, zName); if( rc==SQLITE_OK && aNew->zName==0 ){ rc = SQLITE_NOMEM; } #ifdef SQLITE_HAS_CODEC if( rc==SQLITE_OK ){ extern int sqlite3CodecAttach(sqlite3*, int, const void*, int); extern void sqlite3CodecGetKey(sqlite3*, int, void**, int*); int nKey; char *zKey; int t = sqlite3_value_type(argv[2]); switch( t ){ case SQLITE_INTEGER: case SQLITE_FLOAT: zErrDyn = sqlite3DbStrDup(db, "Invalid key value"); rc = SQLITE_ERROR; break; case SQLITE_TEXT: case SQLITE_BLOB: nKey = sqlite3_value_bytes(argv[2]); zKey = (char *)sqlite3_value_blob(argv[2]); rc = sqlite3CodecAttach(db, db->nDb-1, zKey, nKey); break; case SQLITE_NULL: /* No key specified. Use the key from the main database */ sqlite3CodecGetKey(db, 0, (void**)&zKey, &nKey); if( nKey>0 || sqlite3BtreeGetOptimalReserve(db->aDb[0].pBt)>0 ){ rc = sqlite3CodecAttach(db, db->nDb-1, zKey, nKey); } break; } } #endif /* If the file was opened successfully, read the schema for the new database. ** If this fails, or if opening the file failed, then close the file and ** remove the entry from the db->aDb[] array. i.e. put everything back the way ** we found it. */ if( rc==SQLITE_OK ){ sqlite3BtreeEnterAll(db); rc = sqlite3Init(db, &zErrDyn); sqlite3BtreeLeaveAll(db); } #ifdef SQLITE_USER_AUTHENTICATION if( rc==SQLITE_OK ){ u8 newAuth = 0; rc = sqlite3UserAuthCheckLogin(db, zName, &newAuth); if( newAuth<db->auth.authLevel ){ rc = SQLITE_AUTH_USER; } } #endif if( rc ){ int iDb = db->nDb - 1; assert( iDb>=2 ); if( db->aDb[iDb].pBt ){ sqlite3BtreeClose(db->aDb[iDb].pBt); db->aDb[iDb].pBt = 0; db->aDb[iDb].pSchema = 0; } sqlite3ResetAllSchemasOfConnection(db); db->nDb = iDb; if( rc==SQLITE_NOMEM || rc==SQLITE_IOERR_NOMEM ){ sqlite3OomFault(db); sqlite3DbFree(db, zErrDyn); zErrDyn = sqlite3MPrintf(db, "out of memory"); }else if( zErrDyn==0 ){ zErrDyn = sqlite3MPrintf(db, "unable to open database: %s", zFile); } goto attach_error; } return; attach_error: /* Return an error if we get here */ if( zErrDyn ){ sqlite3_result_error(context, zErrDyn, -1); sqlite3DbFree(db, zErrDyn); } if( rc ) sqlite3_result_error_code(context, rc); }
static void attachFunc( sqlite3_context *context, int NotUsed, sqlite3_value **argv ){ int i; int rc = 0; sqlite3 *db = sqlite3_context_db_handle(context); const char *zName; const char *zFile; Db *aNew; char *zErrDyn = 0; UNUSED_PARAMETER(NotUsed); zFile = (const char *)sqlite3_value_text(argv[0]); zName = (const char *)sqlite3_value_text(argv[1]); if( zFile==0 ) zFile = ""; if( zName==0 ) zName = ""; if( db->nDb>=db->aLimit[SQLITE_LIMIT_ATTACHED]+2 ){ zErrDyn = sqlite3MPrintf(db, "too many attached databases - max %d", db->aLimit[SQLITE_LIMIT_ATTACHED] ); goto attach_error; } if( !db->autoCommit ){ zErrDyn = sqlite3MPrintf(db, "cannot ATTACH database within transaction"); goto attach_error; } for(i=0; i<db->nDb; i++){ char *z = db->aDb[i].zName; assert( z && zName ); if( sqlite3StrICmp(z, zName)==0 ){ zErrDyn = sqlite3MPrintf(db, "database %s is already in use", zName); goto attach_error; } } if( db->aDb==db->aDbStatic ){ aNew = sqlite3DbMallocRaw(db, sizeof(db->aDb[0])*3 ); if( aNew==0 ) return; memcpy(aNew, db->aDb, sizeof(db->aDb[0])*2); }else{ aNew = sqlite3DbRealloc(db, db->aDb, sizeof(db->aDb[0])*(db->nDb+1) ); if( aNew==0 ) return; } db->aDb = aNew; aNew = &db->aDb[db->nDb]; memset(aNew, 0, sizeof(*aNew)); rc = sqlite3BtreeOpen(zFile, db, &aNew->pBt, 0, db->openFlags | SQLITE_OPEN_MAIN_DB); db->nDb++; if( rc==SQLITE_CONSTRAINT ){ rc = SQLITE_ERROR; zErrDyn = sqlite3MPrintf(db, "database is already attached"); }else if( rc==SQLITE_OK ){ Pager *pPager; aNew->pSchema = sqlite3SchemaGet(db, aNew->pBt); if( !aNew->pSchema ){ rc = SQLITE_NOMEM; }else if( aNew->pSchema->file_format && aNew->pSchema->enc!=ENC(db) ){ zErrDyn = sqlite3MPrintf(db, "attached databases must use the same text encoding as main database"); rc = SQLITE_ERROR; } pPager = sqlite3BtreePager(aNew->pBt); sqlite3PagerLockingMode(pPager, db->dfltLockMode); sqlite3BtreeSecureDelete(aNew->pBt, sqlite3BtreeSecureDelete(db->aDb[0].pBt,-1) ); } aNew->safety_level = 3; aNew->zName = sqlite3DbStrDup(db, zName); if( rc==SQLITE_OK && aNew->zName==0 ){ rc = SQLITE_NOMEM; } #ifdef SQLITE_HAS_CODEC if( rc==SQLITE_OK ){ extern int sqlite3CodecAttach(sqlite3*, int, const void*, int); extern void sqlite3CodecGetKey(sqlite3*, int, void**, int*); int nKey; char *zKey; int t = sqlite3_value_type(argv[2]); switch( t ){ case SQLITE_INTEGER: case SQLITE_FLOAT: zErrDyn = sqlite3DbStrDup(db, "Invalid key value"); rc = SQLITE_ERROR; break; case SQLITE_TEXT: case SQLITE_BLOB: nKey = sqlite3_value_bytes(argv[2]); zKey = (char *)sqlite3_value_blob(argv[2]); rc = sqlite3CodecAttach(db, db->nDb-1, zKey, nKey); break; case SQLITE_NULL: sqlite3CodecGetKey(db, 0, (void**)&zKey, &nKey); if( nKey>0 || sqlite3BtreeGetReserve(db->aDb[0].pBt)>0 ){ rc = sqlite3CodecAttach(db, db->nDb-1, zKey, nKey); } break; } } #endif if( rc==SQLITE_OK ){ sqlite3BtreeEnterAll(db); rc = sqlite3Init(db, &zErrDyn); sqlite3BtreeLeaveAll(db); } if( rc ){ int iDb = db->nDb - 1; assert( iDb>=2 ); if( db->aDb[iDb].pBt ){ sqlite3BtreeClose(db->aDb[iDb].pBt); db->aDb[iDb].pBt = 0; db->aDb[iDb].pSchema = 0; } sqlite3ResetInternalSchema(db, -1); db->nDb = iDb; if( rc==SQLITE_NOMEM || rc==SQLITE_IOERR_NOMEM ){ db->mallocFailed = 1; sqlite3DbFree(db, zErrDyn); zErrDyn = sqlite3MPrintf(db, "out of memory"); }else if( zErrDyn==0 ){ zErrDyn = sqlite3MPrintf(db, "unable to open database: %s", zFile); } goto attach_error; } return; attach_error: if( zErrDyn ){ sqlite3_result_error(context, zErrDyn, -1); sqlite3DbFree(db, zErrDyn); } if( rc ) sqlite3_result_error_code(context, rc); }
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 */ if( sqlite3SafetyOn(db) ){ return SQLITE_MISUSE; } rc = sqlite3Init(db, &zErrMsg); 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: if( sqlite3SafetyOff(db) ){ rc = SQLITE_MISUSE; } /* 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); sqliteFree(zErrMsg); return sqlite3ApiExit(db, rc); }