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Added support for the COUNT_CHANGES pragma in order to help out the

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ODBC driver.  Fixed a but on count(*) when applied to empty tables. (CVS 289)

FossilOrigin-Name: 747bf1b30b74cfd0e9c27e7c0bc5172637f35520
This commit is contained in:
drh
2001-10-15 00:44:35 +00:00
parent f2d6a64495
commit 1bee3d7b43
19 changed files with 349 additions and 101 deletions
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14
src/btree.c
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@@ -9,7 +9,7 @@
** May you share freely, never taking more than you give.
**
*************************************************************************
** $Id: btree.c,v 1.33 2001/10/06 16:33:02 drh Exp $
** $Id: btree.c,v 1.34 2001/10/15 00:44:35 drh Exp $
**
** This file implements a external (disk-based) database using BTrees.
** For a detailed discussion of BTrees, refer to
@@ -597,8 +597,8 @@ static void pageDestructor(void *pData){
** until the first page is loaded.
**
** zFilename is the name of the database file. If zFilename is NULL
** a new database with a random name is created. The database will be
** destroyed when sqliteBtreeClose() is called.
** a new database with a random name is created. This randomly named
** database file will be deleted when sqliteBtreeClose() is called.
*/
int sqliteBtreeOpen(
const char *zFilename, /* Name of the file containing the BTree database */
@@ -807,6 +807,13 @@ int sqliteBtreeRollback(Btree *pBt){
** Create a new cursor for the BTree whose root is on the page
** iTable. The act of acquiring a cursor gets a read lock on
** the database file.
**
** If wrFlag==0, then the cursor can only be used for reading.
** If wrFlag==1, then the cursor can be used for reading or writing.
** A read/write cursor requires exclusive access to its table. There
** cannot be two or more cursors open on the same table is any one of
** cursors is a read/write cursor. But there can be two or more
** read-only cursors open on the same table.
*/
int sqliteBtreeCursor(Btree *pBt, int iTable, int wrFlag, BtCursor **ppCur){
int rc;
@@ -1357,6 +1364,7 @@ int sqliteBtreeMoveto(BtCursor *pCur, const void *pKey, int nKey, int *pRes){
int sqliteBtreeNext(BtCursor *pCur, int *pRes){
int rc;
if( pCur->pPage==0 ){
if( pRes ) *pRes = 1;
return SQLITE_ABORT;
}
if( pCur->bSkipNext ){