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312 lines
8.7 KiB
312 lines
8.7 KiB
/*
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** 2003 April 6
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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 code used to implement the ATTACH and DETACH commands.
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**
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** $Id: attach.c 326789 2004-07-07 21:25:56Z pahlibar $
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*/
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#include "sqliteInt.h"
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/*
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** This routine is called by the parser to process an ATTACH statement:
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**
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** ATTACH DATABASE filename AS dbname
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**
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** The pFilename and pDbname arguments are the tokens that define the
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** filename and dbname in the ATTACH statement.
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*/
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void sqliteAttach(Parse *pParse, Token *pFilename, Token *pDbname, Token *pKey){
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Db *aNew;
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int rc, i;
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char *zFile, *zName;
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sqlite *db;
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Vdbe *v;
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v = sqliteGetVdbe(pParse);
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sqliteVdbeAddOp(v, OP_Halt, 0, 0);
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if( pParse->explain ) return;
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db = pParse->db;
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if( db->file_format<4 ){
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sqliteErrorMsg(pParse, "cannot attach auxiliary databases to an "
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"older format master database", 0);
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pParse->rc = SQLITE_ERROR;
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return;
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}
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if( db->nDb>=MAX_ATTACHED+2 ){
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sqliteErrorMsg(pParse, "too many attached databases - max %d",
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MAX_ATTACHED);
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pParse->rc = SQLITE_ERROR;
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return;
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}
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zFile = 0;
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sqliteSetNString(&zFile, pFilename->z, pFilename->n, 0);
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if( zFile==0 ) return;
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sqliteDequote(zFile);
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#ifndef SQLITE_OMIT_AUTHORIZATION
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if( sqliteAuthCheck(pParse, SQLITE_ATTACH, zFile, 0, 0)!=SQLITE_OK ){
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sqliteFree(zFile);
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return;
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}
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#endif /* SQLITE_OMIT_AUTHORIZATION */
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zName = 0;
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sqliteSetNString(&zName, pDbname->z, pDbname->n, 0);
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if( zName==0 ) return;
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sqliteDequote(zName);
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for(i=0; i<db->nDb; i++){
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if( db->aDb[i].zName && sqliteStrICmp(db->aDb[i].zName, zName)==0 ){
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sqliteErrorMsg(pParse, "database %z is already in use", zName);
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pParse->rc = SQLITE_ERROR;
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sqliteFree(zFile);
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return;
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}
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}
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if( db->aDb==db->aDbStatic ){
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aNew = sqliteMalloc( sizeof(db->aDb[0])*3 );
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if( aNew==0 ) return;
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memcpy(aNew, db->aDb, sizeof(db->aDb[0])*2);
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}else{
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aNew = sqliteRealloc(db->aDb, sizeof(db->aDb[0])*(db->nDb+1) );
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if( aNew==0 ) return;
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}
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db->aDb = aNew;
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aNew = &db->aDb[db->nDb++];
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memset(aNew, 0, sizeof(*aNew));
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sqliteHashInit(&aNew->tblHash, SQLITE_HASH_STRING, 0);
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sqliteHashInit(&aNew->idxHash, SQLITE_HASH_STRING, 0);
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sqliteHashInit(&aNew->trigHash, SQLITE_HASH_STRING, 0);
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sqliteHashInit(&aNew->aFKey, SQLITE_HASH_STRING, 1);
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aNew->zName = zName;
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rc = sqliteBtreeFactory(db, zFile, 0, MAX_PAGES, &aNew->pBt);
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if( rc ){
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sqliteErrorMsg(pParse, "unable to open database: %s", zFile);
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}
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#if SQLITE_HAS_CODEC
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{
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extern int sqliteCodecAttach(sqlite*, int, void*, int);
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char *zKey = 0;
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int nKey;
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if( pKey && pKey->z && pKey->n ){
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sqliteSetNString(&zKey, pKey->z, pKey->n, 0);
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sqliteDequote(zKey);
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nKey = strlen(zKey);
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}else{
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zKey = 0;
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nKey = 0;
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}
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sqliteCodecAttach(db, db->nDb-1, zKey, nKey);
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}
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#endif
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sqliteFree(zFile);
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db->flags &= ~SQLITE_Initialized;
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if( pParse->nErr ) return;
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if( rc==SQLITE_OK ){
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rc = sqliteInit(pParse->db, &pParse->zErrMsg);
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}
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if( rc ){
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int i = db->nDb - 1;
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assert( i>=2 );
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if( db->aDb[i].pBt ){
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sqliteBtreeClose(db->aDb[i].pBt);
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db->aDb[i].pBt = 0;
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}
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sqliteResetInternalSchema(db, 0);
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pParse->nErr++;
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pParse->rc = SQLITE_ERROR;
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}
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}
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/*
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** This routine is called by the parser to process a DETACH statement:
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**
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** DETACH DATABASE dbname
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**
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** The pDbname argument is the name of the database in the DETACH statement.
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*/
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void sqliteDetach(Parse *pParse, Token *pDbname){
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int i;
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sqlite *db;
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Vdbe *v;
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Db *pDb;
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v = sqliteGetVdbe(pParse);
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sqliteVdbeAddOp(v, OP_Halt, 0, 0);
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if( pParse->explain ) return;
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db = pParse->db;
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for(i=0; i<db->nDb; i++){
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pDb = &db->aDb[i];
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if( pDb->pBt==0 || pDb->zName==0 ) continue;
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if( strlen(pDb->zName)!=pDbname->n ) continue;
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if( sqliteStrNICmp(pDb->zName, pDbname->z, pDbname->n)==0 ) break;
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}
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if( i>=db->nDb ){
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sqliteErrorMsg(pParse, "no such database: %T", pDbname);
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return;
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}
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if( i<2 ){
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sqliteErrorMsg(pParse, "cannot detach database %T", pDbname);
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return;
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}
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#ifndef SQLITE_OMIT_AUTHORIZATION
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if( sqliteAuthCheck(pParse,SQLITE_DETACH,db->aDb[i].zName,0,0)!=SQLITE_OK ){
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return;
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}
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#endif /* SQLITE_OMIT_AUTHORIZATION */
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sqliteBtreeClose(pDb->pBt);
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pDb->pBt = 0;
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sqliteFree(pDb->zName);
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sqliteResetInternalSchema(db, i);
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if( pDb->pAux && pDb->xFreeAux ) pDb->xFreeAux(pDb->pAux);
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db->nDb--;
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if( i<db->nDb ){
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db->aDb[i] = db->aDb[db->nDb];
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memset(&db->aDb[db->nDb], 0, sizeof(db->aDb[0]));
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sqliteResetInternalSchema(db, i);
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}
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}
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/*
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** Initialize a DbFixer structure. This routine must be called prior
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** to passing the structure to one of the sqliteFixAAAA() routines below.
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**
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** The return value indicates whether or not fixation is required. TRUE
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** means we do need to fix the database references, FALSE means we do not.
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*/
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int sqliteFixInit(
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DbFixer *pFix, /* The fixer to be initialized */
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Parse *pParse, /* Error messages will be written here */
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int iDb, /* This is the database that must must be used */
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const char *zType, /* "view", "trigger", or "index" */
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const Token *pName /* Name of the view, trigger, or index */
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){
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sqlite *db;
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if( iDb<0 || iDb==1 ) return 0;
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db = pParse->db;
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assert( db->nDb>iDb );
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pFix->pParse = pParse;
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pFix->zDb = db->aDb[iDb].zName;
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pFix->zType = zType;
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pFix->pName = pName;
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return 1;
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}
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/*
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** The following set of routines walk through the parse tree and assign
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** a specific database to all table references where the database name
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** was left unspecified in the original SQL statement. The pFix structure
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** must have been initialized by a prior call to sqliteFixInit().
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**
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** These routines are used to make sure that an index, trigger, or
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** view in one database does not refer to objects in a different database.
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** (Exception: indices, triggers, and views in the TEMP database are
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** allowed to refer to anything.) If a reference is explicitly made
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** to an object in a different database, an error message is added to
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** pParse->zErrMsg and these routines return non-zero. If everything
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** checks out, these routines return 0.
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*/
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int sqliteFixSrcList(
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DbFixer *pFix, /* Context of the fixation */
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SrcList *pList /* The Source list to check and modify */
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){
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int i;
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const char *zDb;
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if( pList==0 ) return 0;
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zDb = pFix->zDb;
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for(i=0; i<pList->nSrc; i++){
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if( pList->a[i].zDatabase==0 ){
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pList->a[i].zDatabase = sqliteStrDup(zDb);
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}else if( sqliteStrICmp(pList->a[i].zDatabase,zDb)!=0 ){
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sqliteErrorMsg(pFix->pParse,
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"%s %z cannot reference objects in database %s",
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pFix->zType, sqliteStrNDup(pFix->pName->z, pFix->pName->n),
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pList->a[i].zDatabase);
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return 1;
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}
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if( sqliteFixSelect(pFix, pList->a[i].pSelect) ) return 1;
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if( sqliteFixExpr(pFix, pList->a[i].pOn) ) return 1;
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}
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return 0;
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}
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int sqliteFixSelect(
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DbFixer *pFix, /* Context of the fixation */
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Select *pSelect /* The SELECT statement to be fixed to one database */
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){
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while( pSelect ){
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if( sqliteFixExprList(pFix, pSelect->pEList) ){
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return 1;
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}
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if( sqliteFixSrcList(pFix, pSelect->pSrc) ){
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return 1;
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}
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if( sqliteFixExpr(pFix, pSelect->pWhere) ){
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return 1;
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}
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if( sqliteFixExpr(pFix, pSelect->pHaving) ){
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return 1;
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}
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pSelect = pSelect->pPrior;
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}
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return 0;
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}
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int sqliteFixExpr(
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DbFixer *pFix, /* Context of the fixation */
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Expr *pExpr /* The expression to be fixed to one database */
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){
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while( pExpr ){
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if( sqliteFixSelect(pFix, pExpr->pSelect) ){
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return 1;
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}
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if( sqliteFixExprList(pFix, pExpr->pList) ){
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return 1;
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}
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if( sqliteFixExpr(pFix, pExpr->pRight) ){
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return 1;
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}
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pExpr = pExpr->pLeft;
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}
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return 0;
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}
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int sqliteFixExprList(
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DbFixer *pFix, /* Context of the fixation */
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ExprList *pList /* The expression to be fixed to one database */
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){
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int i;
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if( pList==0 ) return 0;
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for(i=0; i<pList->nExpr; i++){
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if( sqliteFixExpr(pFix, pList->a[i].pExpr) ){
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return 1;
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}
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}
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return 0;
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}
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int sqliteFixTriggerStep(
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DbFixer *pFix, /* Context of the fixation */
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TriggerStep *pStep /* The trigger step be fixed to one database */
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){
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while( pStep ){
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if( sqliteFixSelect(pFix, pStep->pSelect) ){
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return 1;
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}
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if( sqliteFixExpr(pFix, pStep->pWhere) ){
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return 1;
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}
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if( sqliteFixExprList(pFix, pStep->pExprList) ){
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return 1;
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}
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pStep = pStep->pNext;
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}
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return 0;
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}
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