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Add initial infrastructure for cursors. In where.c, optimize out clauses

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of the form "ORDER BY rowid" if a table scan is being performed.  Do a
reverse table scan if "ORDER BY rowid DESC" is present. (CVS 2141)

FossilOrigin-Name: fc8c1393c86017a816beb52725b68af3b973f979
This commit is contained in:
drh
2004-11-22 19:12:19 +00:00
parent 8237d45ed8
commit b6c29897eb
17 changed files with 671 additions and 93 deletions
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20
src/pragma.c
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@@ -11,7 +11,7 @@
*************************************************************************
** This file contains code used to implement the PRAGMA command.
**
** $Id: pragma.c,v 1.78 2004/11/13 15:59:15 drh Exp $
** $Id: pragma.c,v 1.79 2004/11/22 19:12:21 drh Exp $
*/
#include "sqliteInt.h"
#include <ctype.h>
@@ -478,6 +478,24 @@ void sqlite3Pragma(
sqlite3VdbeAddOp(v, OP_Callback, 3, 0);
}
}else
#ifndef SQLITE_OMIT_CURSOR
if( sqlite3StrICmp(zLeft, "cursor_list")==0 ){
int i;
if( sqlite3ReadSchema(pParse) ) goto pragma_out;
sqlite3VdbeSetNumCols(v, 2);
sqlite3VdbeSetColName(v, 0, "seq", P3_STATIC);
sqlite3VdbeSetColName(v, 1, "name", P3_STATIC);
for(i=0; i<db->nSqlCursor; i++){
SqlCursor *p = db->apSqlCursor[i];
if( p==0 ) continue;
assert( p->zName!=0 );
sqlite3VdbeAddOp(v, OP_Integer, i, 0);
sqlite3VdbeOp3(v, OP_String8, 0, 0, p->zName, 0);
sqlite3VdbeAddOp(v, OP_Callback, 2, 0);
}
}else
#endif /* SQLITE_OMIT_CURSOR */
#endif /* SQLITE_OMIT_SCHEMA_PRAGMAS */
#ifndef SQLITE_OMIT_FOREIGN_KEY