584 lines
17 KiB
C
584 lines
17 KiB
C
/*
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** 2005 May 25
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**
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** The author disclaims copyright to this source code. In place of
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** a legal notice, here is a blessing:
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**
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** May you do good and not evil.
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** May you find forgiveness for yourself and forgive others.
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** May you share freely, never taking more than you give.
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**
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*************************************************************************
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** This file contains the implementation of the sqlite3_prepare()
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** interface, and routines that contribute to loading the database schema
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** from disk.
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**
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** $Id$
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*/
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#include "sqliteInt.h"
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#include "os.h"
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#include <ctype.h>
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/*
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** Fill the InitData structure with an error message that indicates
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** that the database is corrupt.
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*/
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static void corruptSchema(InitData *pData, const char *zExtra){
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if( !sqlite3MallocFailed() ){
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sqlite3SetString(pData->pzErrMsg, "malformed database schema",
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zExtra!=0 && zExtra[0]!=0 ? " - " : (char*)0, zExtra, (char*)0);
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}
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}
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/*
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** This is the callback routine for the code that initializes the
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** database. See sqlite3Init() below for additional information.
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** This routine is also called from the OP_ParseSchema opcode of the VDBE.
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**
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** Each callback contains the following information:
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**
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** argv[0] = name of thing being created
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** argv[1] = root page number for table or index. NULL for trigger or view.
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** argv[2] = SQL text for the CREATE statement.
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** argv[3] = "1" for temporary files, "0" for main database, "2" or more
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** for auxiliary database files.
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**
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*/
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int sqlite3InitCallback(void *pInit, int argc, char **argv, char **azColName){
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InitData *pData = (InitData*)pInit;
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sqlite3 *db = pData->db;
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int iDb;
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if( sqlite3MallocFailed() ){
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return SQLITE_NOMEM;
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}
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assert( argc==4 );
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if( argv==0 ) return 0; /* Might happen if EMPTY_RESULT_CALLBACKS are on */
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if( argv[1]==0 || argv[3]==0 ){
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corruptSchema(pData, 0);
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return 1;
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}
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iDb = atoi(argv[3]);
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assert( iDb>=0 && iDb<db->nDb );
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if( argv[2] && argv[2][0] ){
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/* Call the parser to process a CREATE TABLE, INDEX or VIEW.
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** But because db->init.busy is set to 1, no VDBE code is generated
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** or executed. All the parser does is build the internal data
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** structures that describe the table, index, or view.
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*/
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char *zErr;
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int rc;
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assert( db->init.busy );
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db->init.iDb = iDb;
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db->init.newTnum = atoi(argv[1]);
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rc = sqlite3_exec(db, argv[2], 0, 0, &zErr);
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db->init.iDb = 0;
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assert( rc!=SQLITE_OK || zErr==0 );
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if( SQLITE_OK!=rc ){
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if( rc==SQLITE_NOMEM ){
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sqlite3FailedMalloc();
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}else{
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corruptSchema(pData, zErr);
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}
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sqlite3_free(zErr);
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return rc;
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}
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}else{
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/* If the SQL column is blank it means this is an index that
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** was created to be the PRIMARY KEY or to fulfill a UNIQUE
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** constraint for a CREATE TABLE. The index should have already
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** been created when we processed the CREATE TABLE. All we have
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** to do here is record the root page number for that index.
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*/
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Index *pIndex;
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pIndex = sqlite3FindIndex(db, argv[0], db->aDb[iDb].zName);
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if( pIndex==0 || pIndex->tnum!=0 ){
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/* This can occur if there exists an index on a TEMP table which
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** has the same name as another index on a permanent index. Since
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** the permanent table is hidden by the TEMP table, we can also
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** safely ignore the index on the permanent table.
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*/
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/* Do Nothing */;
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}else{
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pIndex->tnum = atoi(argv[1]);
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}
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}
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return 0;
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}
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/*
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** Attempt to read the database schema and initialize internal
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** data structures for a single database file. The index of the
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** database file is given by iDb. iDb==0 is used for the main
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** database. iDb==1 should never be used. iDb>=2 is used for
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** auxiliary databases. Return one of the SQLITE_ error codes to
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** indicate success or failure.
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*/
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static int sqlite3InitOne(sqlite3 *db, int iDb, char **pzErrMsg){
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int rc;
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BtCursor *curMain;
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int size;
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Table *pTab;
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Db *pDb;
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char const *azArg[5];
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char zDbNum[30];
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int meta[10];
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InitData initData;
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char const *zMasterSchema;
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char const *zMasterName = SCHEMA_TABLE(iDb);
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/*
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** The master database table has a structure like this
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*/
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static const char master_schema[] =
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"CREATE TABLE sqlite_master(\n"
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" type text,\n"
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" name text,\n"
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" tbl_name text,\n"
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" rootpage integer,\n"
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" sql text\n"
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")"
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;
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#ifndef SQLITE_OMIT_TEMPDB
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static const char temp_master_schema[] =
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"CREATE TEMP TABLE sqlite_temp_master(\n"
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" type text,\n"
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" name text,\n"
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" tbl_name text,\n"
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" rootpage integer,\n"
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" sql text\n"
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")"
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;
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#else
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#define temp_master_schema 0
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#endif
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assert( iDb>=0 && iDb<db->nDb );
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assert( db->aDb[iDb].pSchema );
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/* zMasterSchema and zInitScript are set to point at the master schema
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** and initialisation script appropriate for the database being
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** initialised. zMasterName is the name of the master table.
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*/
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if( !OMIT_TEMPDB && iDb==1 ){
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zMasterSchema = temp_master_schema;
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}else{
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zMasterSchema = master_schema;
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}
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zMasterName = SCHEMA_TABLE(iDb);
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/* Construct the schema tables. */
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sqlite3SafetyOff(db);
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azArg[0] = zMasterName;
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azArg[1] = "1";
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azArg[2] = zMasterSchema;
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sprintf(zDbNum, "%d", iDb);
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azArg[3] = zDbNum;
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azArg[4] = 0;
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initData.db = db;
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initData.pzErrMsg = pzErrMsg;
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rc = sqlite3InitCallback(&initData, 4, (char **)azArg, 0);
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if( rc!=SQLITE_OK ){
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sqlite3SafetyOn(db);
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return rc;
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}
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pTab = sqlite3FindTable(db, zMasterName, db->aDb[iDb].zName);
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if( pTab ){
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pTab->readOnly = 1;
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}
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sqlite3SafetyOn(db);
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/* Create a cursor to hold the database open
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*/
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pDb = &db->aDb[iDb];
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if( pDb->pBt==0 ){
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if( !OMIT_TEMPDB && iDb==1 ){
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DbSetProperty(db, 1, DB_SchemaLoaded);
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}
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return SQLITE_OK;
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}
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rc = sqlite3BtreeCursor(pDb->pBt, MASTER_ROOT, 0, 0, 0, &curMain);
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if( rc!=SQLITE_OK && rc!=SQLITE_EMPTY ){
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sqlite3SetString(pzErrMsg, sqlite3ErrStr(rc), (char*)0);
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return rc;
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}
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/* Get the database meta information.
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**
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** Meta values are as follows:
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** meta[0] Schema cookie. Changes with each schema change.
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** meta[1] File format of schema layer.
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** meta[2] Size of the page cache.
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** meta[3] Use freelist if 0. Autovacuum if greater than zero.
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** meta[4] Db text encoding. 1:UTF-8 3:UTF-16 LE 4:UTF-16 BE
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** meta[5] The user cookie. Used by the application.
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** meta[6]
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** meta[7]
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** meta[8]
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** meta[9]
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**
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** Note: The #defined SQLITE_UTF* symbols in sqliteInt.h correspond to
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** the possible values of meta[4].
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*/
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if( rc==SQLITE_OK ){
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int i;
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for(i=0; rc==SQLITE_OK && i<sizeof(meta)/sizeof(meta[0]); i++){
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rc = sqlite3BtreeGetMeta(pDb->pBt, i+1, (u32 *)&meta[i]);
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}
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if( rc ){
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sqlite3SetString(pzErrMsg, sqlite3ErrStr(rc), (char*)0);
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sqlite3BtreeCloseCursor(curMain);
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return rc;
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}
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}else{
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memset(meta, 0, sizeof(meta));
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}
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pDb->pSchema->schema_cookie = meta[0];
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/* If opening a non-empty database, check the text encoding. For the
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** main database, set sqlite3.enc to the encoding of the main database.
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** For an attached db, it is an error if the encoding is not the same
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** as sqlite3.enc.
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*/
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if( meta[4] ){ /* text encoding */
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if( iDb==0 ){
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/* If opening the main database, set ENC(db). */
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ENC(db) = (u8)meta[4];
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db->pDfltColl = sqlite3FindCollSeq(db, SQLITE_UTF8, "BINARY", 6, 0);
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}else{
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/* If opening an attached database, the encoding much match ENC(db) */
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if( meta[4]!=ENC(db) ){
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sqlite3BtreeCloseCursor(curMain);
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sqlite3SetString(pzErrMsg, "attached databases must use the same"
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" text encoding as main database", (char*)0);
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return SQLITE_ERROR;
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}
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}
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}else{
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DbSetProperty(db, iDb, DB_Empty);
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}
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pDb->pSchema->enc = ENC(db);
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size = meta[2];
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if( size==0 ){ size = MAX_PAGES; }
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pDb->pSchema->cache_size = size;
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sqlite3BtreeSetCacheSize(pDb->pBt, pDb->pSchema->cache_size);
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/*
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** file_format==1 Version 3.0.0.
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** file_format==2 Version 3.1.3. // ALTER TABLE ADD COLUMN
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** file_format==3 Version 3.1.4. // ditto but with non-NULL defaults
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** file_format==4 Version 3.3.0. // DESC indices. Boolean constants
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*/
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pDb->pSchema->file_format = meta[1];
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if( pDb->pSchema->file_format==0 ){
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pDb->pSchema->file_format = 1;
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}
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if( pDb->pSchema->file_format>SQLITE_MAX_FILE_FORMAT ){
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sqlite3BtreeCloseCursor(curMain);
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sqlite3SetString(pzErrMsg, "unsupported file format", (char*)0);
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return SQLITE_ERROR;
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}
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/* Read the schema information out of the schema tables
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*/
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assert( db->init.busy );
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if( rc==SQLITE_EMPTY ){
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/* For an empty database, there is nothing to read */
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rc = SQLITE_OK;
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}else{
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char *zSql;
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zSql = sqlite3MPrintf(
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"SELECT name, rootpage, sql, '%s' FROM '%q'.%s",
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zDbNum, db->aDb[iDb].zName, zMasterName);
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sqlite3SafetyOff(db);
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rc = sqlite3_exec(db, zSql, sqlite3InitCallback, &initData, 0);
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sqlite3SafetyOn(db);
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sqliteFree(zSql);
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#ifndef SQLITE_OMIT_ANALYZE
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if( rc==SQLITE_OK ){
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sqlite3AnalysisLoad(db, iDb);
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}
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#endif
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sqlite3BtreeCloseCursor(curMain);
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}
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if( sqlite3MallocFailed() ){
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/* sqlite3SetString(pzErrMsg, "out of memory", (char*)0); */
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rc = SQLITE_NOMEM;
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sqlite3ResetInternalSchema(db, 0);
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}
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if( rc==SQLITE_OK ){
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DbSetProperty(db, iDb, DB_SchemaLoaded);
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}else{
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sqlite3ResetInternalSchema(db, iDb);
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}
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return rc;
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}
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/*
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** Initialize all database files - the main database file, the file
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** used to store temporary tables, and any additional database files
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** created using ATTACH statements. Return a success code. If an
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** error occurs, write an error message into *pzErrMsg.
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**
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** After a database is initialized, the DB_SchemaLoaded bit is set
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** bit is set in the flags field of the Db structure. If the database
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** file was of zero-length, then the DB_Empty flag is also set.
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*/
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int sqlite3Init(sqlite3 *db, char **pzErrMsg){
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int i, rc;
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int called_initone = 0;
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if( db->init.busy ) return SQLITE_OK;
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rc = SQLITE_OK;
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db->init.busy = 1;
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for(i=0; rc==SQLITE_OK && i<db->nDb; i++){
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if( DbHasProperty(db, i, DB_SchemaLoaded) || i==1 ) continue;
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rc = sqlite3InitOne(db, i, pzErrMsg);
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if( rc ){
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sqlite3ResetInternalSchema(db, i);
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}
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called_initone = 1;
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}
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/* Once all the other databases have been initialised, load the schema
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** for the TEMP database. This is loaded last, as the TEMP database
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** schema may contain references to objects in other databases.
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*/
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#ifndef SQLITE_OMIT_TEMPDB
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if( rc==SQLITE_OK && db->nDb>1 && !DbHasProperty(db, 1, DB_SchemaLoaded) ){
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rc = sqlite3InitOne(db, 1, pzErrMsg);
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if( rc ){
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sqlite3ResetInternalSchema(db, 1);
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}
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called_initone = 1;
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}
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#endif
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db->init.busy = 0;
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if( rc==SQLITE_OK && called_initone ){
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sqlite3CommitInternalChanges(db);
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}
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return rc;
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}
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/*
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** This routine is a no-op if the database schema is already initialised.
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** Otherwise, the schema is loaded. An error code is returned.
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*/
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int sqlite3ReadSchema(Parse *pParse){
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int rc = SQLITE_OK;
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sqlite3 *db = pParse->db;
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if( !db->init.busy ){
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rc = sqlite3Init(db, &pParse->zErrMsg);
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}
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if( rc!=SQLITE_OK ){
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pParse->rc = rc;
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pParse->nErr++;
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}
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return rc;
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}
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/*
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** Check schema cookies in all databases. If any cookie is out
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** of date, return 0. If all schema cookies are current, return 1.
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*/
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static int schemaIsValid(sqlite3 *db){
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int iDb;
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int rc;
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BtCursor *curTemp;
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int cookie;
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int allOk = 1;
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for(iDb=0; allOk && iDb<db->nDb; iDb++){
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Btree *pBt;
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pBt = db->aDb[iDb].pBt;
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if( pBt==0 ) continue;
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rc = sqlite3BtreeCursor(pBt, MASTER_ROOT, 0, 0, 0, &curTemp);
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if( rc==SQLITE_OK ){
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rc = sqlite3BtreeGetMeta(pBt, 1, (u32 *)&cookie);
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if( rc==SQLITE_OK && cookie!=db->aDb[iDb].pSchema->schema_cookie ){
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allOk = 0;
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}
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sqlite3BtreeCloseCursor(curTemp);
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}
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}
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return allOk;
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}
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|
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/*
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** Convert a schema pointer into the iDb index that indicates
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** which database file in db->aDb[] the schema refers to.
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**
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** If the same database is attached more than once, the first
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** attached database is returned.
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*/
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int sqlite3SchemaToIndex(sqlite3 *db, Schema *pSchema){
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int i = -1000000;
|
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|
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/* 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
|
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** created by a sub-select). In this case the return value of this
|
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** function should never be used.
|
|
**
|
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** We return -1000000 instead of the more usual -1 simply because using
|
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** -1000000 as incorrectly using -1000000 index into db->aDb[] is much
|
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** more likely to cause a segfault than -1 (of course there are assert()
|
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** statements too, but it never hurts to play the odds).
|
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*/
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if( pSchema ){
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for(i=0; i<db->nDb; i++){
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if( db->aDb[i].pSchema==pSchema ){
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break;
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}
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|
}
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assert( i>=0 &&i>=0 && i<db->nDb );
|
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}
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return i;
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|
}
|
|
|
|
/*
|
|
** Compile the UTF-8 encoded SQL statement zSql into a statement handle.
|
|
*/
|
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int sqlite3_prepare(
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sqlite3 *db, /* Database handle. */
|
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const char *zSql, /* UTF-8 encoded SQL statement. */
|
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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 */
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|
){
|
|
Parse sParse;
|
|
char *zErrMsg = 0;
|
|
int rc = SQLITE_OK;
|
|
int i;
|
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|
|
/* Assert that malloc() has not failed */
|
|
assert( !sqlite3MallocFailed() );
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|
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assert( ppStmt );
|
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*ppStmt = 0;
|
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if( sqlite3SafetyOn(db) ){
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return SQLITE_MISUSE;
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}
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|
|
/* If any attached database schemas are locked, do not proceed with
|
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** compilation. Instead return SQLITE_LOCKED immediately.
|
|
*/
|
|
for(i=0; i<db->nDb; i++) {
|
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Btree *pBt = db->aDb[i].pBt;
|
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if( pBt && sqlite3BtreeSchemaLocked(pBt) ){
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const char *zDb = db->aDb[i].zName;
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sqlite3Error(db, SQLITE_LOCKED, "database schema is locked: %s", zDb);
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sqlite3SafetyOff(db);
|
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return SQLITE_LOCKED;
|
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}
|
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}
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|
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memset(&sParse, 0, sizeof(sParse));
|
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sParse.db = db;
|
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if( nBytes>=0 && zSql[nBytes]!=0 ){
|
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char *zSqlCopy = sqlite3StrNDup(zSql, nBytes);
|
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sqlite3RunParser(&sParse, zSqlCopy, &zErrMsg);
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sParse.zTail += zSql - zSqlCopy;
|
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sqliteFree(zSqlCopy);
|
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}else{
|
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sqlite3RunParser(&sParse, zSql, &zErrMsg);
|
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}
|
|
|
|
if( sqlite3MallocFailed() ){
|
|
sParse.rc = SQLITE_NOMEM;
|
|
}
|
|
if( sParse.rc==SQLITE_DONE ) sParse.rc = SQLITE_OK;
|
|
if( sParse.checkSchema && !schemaIsValid(db) ){
|
|
sParse.rc = SQLITE_SCHEMA;
|
|
}
|
|
if( sParse.rc==SQLITE_SCHEMA ){
|
|
sqlite3ResetInternalSchema(db, 0);
|
|
}
|
|
if( pzTail ) *pzTail = sParse.zTail;
|
|
rc = sParse.rc;
|
|
|
|
#ifndef SQLITE_OMIT_EXPLAIN
|
|
if( rc==SQLITE_OK && sParse.pVdbe && sParse.explain ){
|
|
if( sParse.explain==2 ){
|
|
sqlite3VdbeSetNumCols(sParse.pVdbe, 3);
|
|
sqlite3VdbeSetColName(sParse.pVdbe, 0, COLNAME_NAME, "order", P3_STATIC);
|
|
sqlite3VdbeSetColName(sParse.pVdbe, 1, COLNAME_NAME, "from", P3_STATIC);
|
|
sqlite3VdbeSetColName(sParse.pVdbe, 2, COLNAME_NAME, "detail", P3_STATIC);
|
|
}else{
|
|
sqlite3VdbeSetNumCols(sParse.pVdbe, 5);
|
|
sqlite3VdbeSetColName(sParse.pVdbe, 0, COLNAME_NAME, "addr", P3_STATIC);
|
|
sqlite3VdbeSetColName(sParse.pVdbe, 1, COLNAME_NAME, "opcode", P3_STATIC);
|
|
sqlite3VdbeSetColName(sParse.pVdbe, 2, COLNAME_NAME, "p1", P3_STATIC);
|
|
sqlite3VdbeSetColName(sParse.pVdbe, 3, COLNAME_NAME, "p2", P3_STATIC);
|
|
sqlite3VdbeSetColName(sParse.pVdbe, 4, COLNAME_NAME, "p3", P3_STATIC);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
if( sqlite3SafetyOff(db) ){
|
|
rc = SQLITE_MISUSE;
|
|
}
|
|
if( rc==SQLITE_OK ){
|
|
*ppStmt = (sqlite3_stmt*)sParse.pVdbe;
|
|
}else if( sParse.pVdbe ){
|
|
sqlite3_finalize((sqlite3_stmt*)sParse.pVdbe);
|
|
}
|
|
|
|
if( zErrMsg ){
|
|
sqlite3Error(db, rc, "%s", zErrMsg);
|
|
sqliteFree(zErrMsg);
|
|
}else{
|
|
sqlite3Error(db, rc, 0);
|
|
}
|
|
|
|
rc = sqlite3ApiExit(db, rc);
|
|
sqlite3ReleaseThreadData();
|
|
return rc;
|
|
}
|
|
|
|
#ifndef SQLITE_OMIT_UTF16
|
|
/*
|
|
** Compile the UTF-16 encoded SQL statement zSql into a statement handle.
|
|
*/
|
|
int sqlite3_prepare16(
|
|
sqlite3 *db, /* Database handle. */
|
|
const void *zSql, /* UTF-8 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 */
|
|
){
|
|
/* 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;
|
|
|
|
if( sqlite3SafetyCheck(db) ){
|
|
return SQLITE_MISUSE;
|
|
}
|
|
zSql8 = sqlite3utf16to8(zSql, nBytes);
|
|
if( zSql8 ){
|
|
rc = sqlite3_prepare(db, zSql8, -1, 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, zTail8-zSql8);
|
|
*pzTail = (u8 *)zSql + sqlite3utf16ByteLen(zSql, chars_parsed);
|
|
}
|
|
sqliteFree(zSql8);
|
|
return sqlite3ApiExit(db, rc);
|
|
}
|
|
#endif /* SQLITE_OMIT_UTF16 */
|