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The btree layer now tracks when a database is empty at the start of a

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transaction and rolls back to that state.

FossilOrigin-Name: 01ef6c1944507c188a83a434ff00e98ad767f744
This commit is contained in:
drh
2010-03-29 21:13:12 +00:00
parent 5e0ccc216d
commit 25a80ad0b1
4 changed files with 14 additions and 11 deletions
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2
src/btree.c
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@@ -2484,6 +2484,7 @@ int sqlite3BtreeBeginTrans(Btree *p, int wrflag){
rc = querySharedCacheTableLock(p, MASTER_ROOT, READ_LOCK);
if( SQLITE_OK!=rc ) goto trans_begun;
pBt->initiallyEmpty = pBt->nPage==0;
do {
/* Call lockBtree() until either pBt->pPage1 is populated or
** lockBtree() returns something other than SQLITE_OK. lockBtree()
@@ -3264,6 +3265,7 @@ int sqlite3BtreeSavepoint(Btree *p, int op, int iSavepoint){
sqlite3BtreeEnter(p);
rc = sqlite3PagerSavepoint(pBt->pPager, op, iSavepoint);
if( rc==SQLITE_OK ){
if( iSavepoint<0 && pBt->initiallyEmpty ) pBt->nPage = 0;
rc = newDatabase(pBt);
pBt->nPage = get4byte(28 + pBt->pPage1->aData);
}