/* ** The parser calls this routine when it sees the first token ** of an argument to the module name in a CREATE VIRTUAL TABLE statement. */ SQLITE_PRIVATE void sqlite3VtabArgInit(Parse *pParse){ addArgumentToVtab(pParse); pParse->sArg.z = 0; pParse->sArg.n = 0; }
/* ** The parser calls this routine after the CREATE VIRTUAL TABLE statement ** has been completely parsed. */ void sqlite3VtabFinishParse(Parse *pParse, Token *pEnd){ Table *pTab = pParse->pNewTable; /* The table being constructed */ sqlite3 *db = pParse->db; /* The database connection */ if( pTab==0 ) return; addArgumentToVtab(pParse); pParse->sArg.z = 0; if( pTab->nModuleArg<1 ) return; /* If the CREATE VIRTUAL TABLE statement is being entered for the ** first time (in other words if the virtual table is actually being ** created now instead of just being read out of sqlite_master) then ** do additional initialization work and store the statement text ** in the sqlite_master table. */ if( !db->init.busy ){ char *zStmt; char *zWhere; int iDb; Vdbe *v; /* Compute the complete text of the CREATE VIRTUAL TABLE statement */ if( pEnd ){ pParse->sNameToken.n = (int)(pEnd->z - pParse->sNameToken.z) + pEnd->n; } zStmt = sqlite3MPrintf(db, "CREATE VIRTUAL TABLE %T", &pParse->sNameToken); /* A slot for the record has already been allocated in the ** SQLITE_MASTER table. We just need to update that slot with all ** the information we've collected. ** ** The VM register number pParse->regRowid holds the rowid of an ** entry in the sqlite_master table tht was created for this vtab ** by sqlite3StartTable(). */ iDb = sqlite3SchemaToIndex(db, pTab->pSchema); sqlite3NestedParse(pParse, "UPDATE %Q.%s " "SET type='table', name=%Q, tbl_name=%Q, rootpage=0, sql=%Q " "WHERE rowid=#%d", db->aDb[iDb].zName, SCHEMA_TABLE(iDb), pTab->zName, pTab->zName, zStmt, pParse->regRowid ); sqlite3DbFree(db, zStmt); v = sqlite3GetVdbe(pParse); sqlite3ChangeCookie(pParse, iDb); sqlite3VdbeAddOp2(v, OP_Expire, 0, 0); zWhere = sqlite3MPrintf(db, "name='%q' AND type='table'", pTab->zName); sqlite3VdbeAddParseSchemaOp(v, iDb, zWhere); sqlite3VdbeAddOp4(v, OP_VCreate, iDb, 0, 0, pTab->zName, sqlite3Strlen30(pTab->zName) + 1); } /* If we are rereading the sqlite_master table create the in-memory ** record of the table. The xConnect() method is not called until ** the first time the virtual table is used in an SQL statement. This ** allows a schema that contains virtual tables to be loaded before ** the required virtual table implementations are registered. */ else { Table *pOld; Schema *pSchema = pTab->pSchema; const char *zName = pTab->zName; int nName = sqlite3Strlen30(zName); assert( sqlite3SchemaMutexHeld(db, 0, pSchema) ); pOld = sqlite3HashInsert(&pSchema->tblHash, zName, nName, pTab); if( pOld ){ db->mallocFailed = 1; assert( pTab==pOld ); /* Malloc must have failed inside HashInsert() */ return; } pParse->pNewTable = 0; } }
/* ** The parser calls this routine after the CREATE VIRTUAL TABLE statement ** has been completely parsed. */ void sqlite3VtabFinishParse(Parse *pParse, Token *pEnd){ Table *pTab; /* The table being constructed */ sqlite3 *db; /* The database connection */ char *zModule; /* The module name of the table: USING modulename */ Module *pMod = 0; addArgumentToVtab(pParse); pParse->sArg.z = 0; /* Lookup the module name. */ pTab = pParse->pNewTable; if( pTab==0 ) return; db = pParse->db; if( pTab->nModuleArg<1 ) return; zModule = pTab->azModuleArg[0]; pMod = (Module *)sqlite3HashFind(&db->aModule, zModule, strlen(zModule)); pTab->pMod = pMod; /* If the CREATE VIRTUAL TABLE statement is being entered for the ** first time (in other words if the virtual table is actually being ** created now instead of just being read out of sqlite_master) then ** do additional initialization work and store the statement text ** in the sqlite_master table. */ if( !db->init.busy ){ char *zStmt; char *zWhere; int iDb; Vdbe *v; /* Compute the complete text of the CREATE VIRTUAL TABLE statement */ if( pEnd ){ pParse->sNameToken.n = pEnd->z - pParse->sNameToken.z + pEnd->n; } zStmt = sqlite3MPrintf(db, "CREATE VIRTUAL TABLE %T", &pParse->sNameToken); /* A slot for the record has already been allocated in the ** SQLITE_MASTER table. We just need to update that slot with all ** the information we've collected. ** ** The VM register number pParse->regRowid holds the rowid of an ** entry in the sqlite_master table tht was created for this vtab ** by sqlite3StartTable(). */ iDb = sqlite3SchemaToIndex(db, pTab->pSchema); sqlite3NestedParse(pParse, "UPDATE %Q.%s " "SET type='table', name=%Q, tbl_name=%Q, rootpage=0, sql=%Q " "WHERE rowid=#%d", db->aDb[iDb].zName, SCHEMA_TABLE(iDb), pTab->zName, pTab->zName, zStmt, pParse->regRowid ); sqlite3_free(zStmt); v = sqlite3GetVdbe(pParse); sqlite3ChangeCookie(pParse, iDb); sqlite3VdbeAddOp2(v, OP_Expire, 0, 0); zWhere = sqlite3MPrintf(db, "name='%q'", pTab->zName); sqlite3VdbeAddOp4(v, OP_ParseSchema, iDb, 1, 0, zWhere, P4_DYNAMIC); sqlite3VdbeAddOp4(v, OP_VCreate, iDb, 0, 0, pTab->zName, strlen(pTab->zName) + 1); } /* If we are rereading the sqlite_master table create the in-memory ** record of the table. If the module has already been registered, ** also call the xConnect method here. */ else { Table *pOld; Schema *pSchema = pTab->pSchema; const char *zName = pTab->zName; int nName = strlen(zName) + 1; pOld = sqlite3HashInsert(&pSchema->tblHash, zName, nName, pTab); if( pOld ){ db->mallocFailed = 1; assert( pTab==pOld ); /* Malloc must have failed inside HashInsert() */ return; } pSchema->db = pParse->db; pParse->pNewTable = 0; } }