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Incremental check-in of changes that will ultimately lead to a

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working autoincrement. (CVS 2056)

FossilOrigin-Name: 10c3d88305e404b9e4cc4eef0b8e5dc7864a5937
This commit is contained in:
drh
2004-11-05 00:43:11 +00:00
parent 40e016e492
commit 205f48e635
9 changed files with 154 additions and 32 deletions
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21
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 1.204 2004/11/04 14:30:05 danielk1977 Exp $
** $Id: btree.c,v 1.205 2004/11/05 00:43:12 drh Exp $
**
** This file implements a external (disk-based) database using BTrees.
** For a detailed discussion of BTrees, refer to
@@ -4412,6 +4412,18 @@ int sqlite3BtreeClearTable(Btree *pBt, int iTable){
**
** This routine will fail with SQLITE_LOCKED if there are any open
** cursors on the table.
**
** If AUTOVACUUM is enabled and the page at iTable is not the last
** root page in the database file, then the last root page
** in the database file is moved into the slot formerly occupied by
** iTable and that last slot formerly occupied by the last root page
** is added to the freelist instead of iTable. In this say, all
** root pages are kept at the beginning of the database file, which
** is necessary for AUTOVACUUM to work right. *piMoved is set to the
** page number that used to be the last root page in the file before
** the move. If no page gets moved, *piMoved is set to 0.
** The last root page is recorded in meta[3] and the value of
** meta[3] is updated by this procedure.
*/
int sqlite3BtreeDropTable(Btree *pBt, int iTable, int *piMoved){
int rc;
@@ -4434,7 +4446,7 @@ int sqlite3BtreeDropTable(Btree *pBt, int iTable, int *piMoved){
rc = sqlite3BtreeClearTable(pBt, iTable);
if( rc ) return rc;
if( piMoved ) *piMoved = 0;
*piMoved = 0;
if( iTable>1 ){
#ifdef SQLITE_OMIT_AUTOVACUUM
@@ -4521,8 +4533,9 @@ int sqlite3BtreeGetMeta(Btree *pBt, int idx, u32 *pMeta){
*pMeta = get4byte(&pP1[36 + idx*4]);
sqlite3pager_unref(pP1);
/* The current implementation is unable to handle writes to an autovacuumed
** database. So make such a database readonly. */
/* If autovacuumed is disabled in the implementation but we are
** trying to access an autovacuumed database, then make the
** database readonly. */
#ifdef SQLITE_OMIT_AUTOVACUUM
if( idx==4 && *pMeta>0 ) pBt->readOnly = 1;
#endif