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/*
** 2003 April 6
**
** 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 code used to implement the ATTACH and DETACH commands.
**
** $Id$
*/
#include "sqliteInt.h"
/*
** This routine is called by the parser to process an ATTACH statement:
**
** ATTACH DATABASE filename AS dbname
**
** The pFilename and pDbname arguments are the tokens that define the
** filename and dbname in the ATTACH statement.
*/
void sqliteAttach(Parse *pParse, Token *pFilename, Token *pDbname){
Db *aNew;
int rc, i;
char *zFile, *zName;
sqlite *db;
if( pParse->explain ) return;
db = pParse->db;
if( db->file_format<4 ){
sqliteErrorMsg(pParse, "cannot attach auxiliary databases to an "
"older format master database", 0);
pParse->rc = SQLITE_ERROR;
return;
}
if( db->nDb>=MAX_ATTACHED+2 ){
sqliteErrorMsg(pParse, "too many attached databases - max %d",
MAX_ATTACHED);
pParse->rc = SQLITE_ERROR;
return;
}
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));
sqliteHashInit(&aNew->tblHash, SQLITE_HASH_STRING, 0);
sqliteHashInit(&aNew->idxHash, SQLITE_HASH_STRING, 0);
sqliteHashInit(&aNew->trigHash, SQLITE_HASH_STRING, 0);
sqliteHashInit(&aNew->aFKey, SQLITE_HASH_STRING, 1);
zName = 0;
sqliteSetNString(&zName, pDbname->z, pDbname->n, 0);
if( zName==0 ) return;
sqliteDequote(zName);
for(i=0; i<db->nDb; i++){
if( db->aDb[i].zName && sqliteStrICmp(db->aDb[i].zName, zName)==0 ){
sqliteErrorMsg(pParse, "database %z is already in use", zName);
db->nDb--;
pParse->rc = SQLITE_ERROR;
return;
}
}
aNew->zName = zName;
zFile = 0;
sqliteSetNString(&zFile, pFilename->z, pFilename->n, 0);
if( zFile==0 ) return;
sqliteDequote(zFile);
rc = sqliteBtreeFactory(db, zFile, 0, MAX_PAGES, &aNew->pBt);
if( rc ){
sqliteErrorMsg(pParse, "unable to open database: %s", zFile);
}
sqliteFree(zFile);
db->flags &= ~SQLITE_Initialized;
if( pParse->nErr ) return;
rc = sqliteInit(pParse->db, &pParse->zErrMsg);
if( rc ){
sqliteResetInternalSchema(db, 0);
pParse->nErr++;
pParse->rc = SQLITE_ERROR;
}
}
/*
** This routine is called by the parser to process a DETACH statement:
**
** DETACH DATABASE dbname
**
** The pDbname argument is the name of the database in the DETACH statement.
*/
void sqliteDetach(Parse *pParse, Token *pDbname){
int i;
sqlite *db;
if( pParse->explain ) return;
db = pParse->db;
for(i=0; i<db->nDb; i++){
if( db->aDb[i].pBt==0 || db->aDb[i].zName==0 ) continue;
if( strlen(db->aDb[i].zName)!=pDbname->n ) continue;
if( sqliteStrNICmp(db->aDb[i].zName, pDbname->z, pDbname->n)==0 ) break;
}
if( i>=db->nDb ){
sqliteErrorMsg(pParse, "no such database: %T", pDbname);
return;
}
if( i<2 ){
sqliteErrorMsg(pParse, "cannot detach database %T", pDbname);
return;
}
sqliteBtreeClose(db->aDb[i].pBt);
db->aDb[i].pBt = 0;
sqliteFree(db->aDb[i].zName);
sqliteResetInternalSchema(db, i);
db->nDb--;
if( i<db->nDb ){
db->aDb[i] = db->aDb[db->nDb];
memset(&db->aDb[db->nDb], 0, sizeof(db->aDb[0]));
sqliteResetInternalSchema(db, i);
}
}
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