/*
** 2001 September 15
**
** 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 C code routines that are called by the parser
** in order to generate code for DELETE FROM statements.
**
** $Id: delete.c,v 1.207 2009/08/08 18:01:08 drh Exp $
**
*************************************************************************
** Included in SQLite3 port to C#-SQLite; 2008 Noah B Hart
** C#-SQLite is an independent reimplementation of the SQLite software library
**
** $Header$
*************************************************************************
*/
//#include "sqliteInt.h"
/*
** Look up every table that is named in pSrc. If any table is not found,
** add an error message to pParse.zErrMsg and return NULL. If all tables
** are found, return a pointer to the last table.
*/
static Table sqlite3SrcListLookup(Parse pParse, SrcList pSrc)
{
SrcList_item pItem = pSrc.a[0];
Table pTab;
Debug.Assert(pItem != null && pSrc.nSrc == 1);
pTab = sqlite3LocateTable(pParse, 0, pItem.zName, pItem.zDatabase);
sqlite3DeleteTable(ref pItem.pTab);
pItem.pTab = pTab;
if (pTab != null)
{
pTab.nRef++;
}
if (sqlite3IndexedByLookup(pParse, pItem) != 0)
{
pTab = null;
}
return(pTab);
}
/*
** If the source-list item passed as an argument was augmented with an
** INDEXED BY clause, then try to locate the specified index. If there
** was such a clause and the named index cannot be found, return
** SQLITE_ERROR and leave an error in pParse. Otherwise, populate
** pFrom.pIndex and return SQLITE_OK.
*/
static int sqlite3IndexedByLookup( Parse pParse, SrcList_item pFrom )
{
if ( pFrom.pTab != null && pFrom.zIndex != null && pFrom.zIndex.Length != 0 )
{
Table pTab = pFrom.pTab;
string zIndex = pFrom.zIndex;
Index pIdx;
for ( pIdx = pTab.pIndex;
pIdx != null && !pIdx.zName.Equals( zIndex, StringComparison.OrdinalIgnoreCase );
pIdx = pIdx.pNext
)
;
if ( null == pIdx )
{
sqlite3ErrorMsg( pParse, "no such index: %s", zIndex );
pParse.checkSchema = 1;
return SQLITE_ERROR;
}
pFrom.pIndex = pIdx;
}
return SQLITE_OK;
}
/*
** If the source-list item passed as an argument was augmented with an
** INDEXED BY clause, then try to locate the specified index. If there
** was such a clause and the named index cannot be found, return
** SQLITE_ERROR and leave an error in pParse. Otherwise, populate
** pFrom.pIndex and return SQLITE_OK.
*/
static int sqlite3IndexedByLookup( Parse pParse, SrcList_item pFrom )
{
if ( pFrom.pTab != null && pFrom.zIndex != null && pFrom.zIndex.Length != 0 )
{
Table pTab = pFrom.pTab;
string zIndex = pFrom.zIndex;
Index pIdx;
for ( pIdx = pTab.pIndex;
pIdx != null && sqlite3StrICmp( pIdx.zName, zIndex ) != 0;
pIdx = pIdx.pNext
) ;
if ( null == pIdx )
{
sqlite3ErrorMsg( pParse, "no such index: %s", zIndex );
return SQLITE_ERROR;
}
pFrom.pIndex = pIdx;
}
return SQLITE_OK;
}