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Allow sqlite3_snapshot_open() to be called to change the snapshot after a read

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transaction is already open on database.

FossilOrigin-Name: 41399169954f9bef53c3fa89879f39823b80bd127f76cf60abbe24217878a571
This commit is contained in:
dan
2018-08-15 14:03:26 +00:00
parent 8430450674 fa3d4c19a9
commit 588032fe33
11 changed files with 341 additions and 36 deletions
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24
src/main.c
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@@ -4209,11 +4209,29 @@ int sqlite3_snapshot_open(
iDb = sqlite3FindDbName(db, zDb);
if( iDb==0 || iDb>1 ){
Btree *pBt = db->aDb[iDb].pBt;
if( 0==sqlite3BtreeIsInReadTrans(pBt) ){
rc = sqlite3PagerSnapshotOpen(sqlite3BtreePager(pBt), pSnapshot);
if( sqlite3BtreeIsInTrans(pBt)==0 ){
Pager *pPager = sqlite3BtreePager(pBt);
int bUnlock = 0;
if( sqlite3BtreeIsInReadTrans(pBt) ){
if( db->nVdbeActive==0 ){
rc = sqlite3PagerSnapshotCheck(pPager, pSnapshot);
if( rc==SQLITE_OK ){
bUnlock = 1;
rc = sqlite3BtreeCommit(pBt);
}
}
}else{
rc = SQLITE_OK;
}
if( rc==SQLITE_OK ){
rc = sqlite3PagerSnapshotOpen(pPager, pSnapshot);
}
if( rc==SQLITE_OK ){
rc = sqlite3BtreeBeginTrans(pBt, 0, 0);
sqlite3PagerSnapshotOpen(sqlite3BtreePager(pBt), 0);
sqlite3PagerSnapshotOpen(pPager, 0);
}
if( bUnlock ){
sqlite3PagerSnapshotUnlock(pPager);
}
}
}