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-rw-r--r--src/vdbeblob.c33
1 files changed, 24 insertions, 9 deletions
diff --git a/src/vdbeblob.c b/src/vdbeblob.c
index 42edcf7de..a15fec6c4 100644
--- a/src/vdbeblob.c
+++ b/src/vdbeblob.c
@@ -385,7 +385,7 @@ static int blobReadWrite(
int iOffset,
int (*xCall)(BtCursor*, u32, u32, void*)
){
- int rc;
+ int rc = SQLITE_OK;
Incrblob *p = (Incrblob *)pBlob;
Vdbe *v;
sqlite3 *db;
@@ -425,17 +425,32 @@ static int blobReadWrite(
** using the incremental-blob API, this works. For the sessions module
** anyhow.
*/
- sqlite3_int64 iKey;
- iKey = sqlite3BtreeIntegerKey(p->pCsr);
- assert( v->apCsr[0]!=0 );
- assert( v->apCsr[0]->eCurType==CURTYPE_BTREE );
- sqlite3VdbePreUpdateHook(
- v, v->apCsr[0], SQLITE_DELETE, p->zDb, p->pTab, iKey, -1, p->iCol
- );
+ if( sqlite3BtreeCursorIsValidNN(p->pCsr)==0 ){
+ /* If the cursor is not currently valid, try to reseek it. This
+ ** always either fails or finds the correct row - the cursor will
+ ** have been marked permanently CURSOR_INVALID if the open row has
+ ** been deleted. */
+ int bDiff = 0;
+ rc = sqlite3BtreeCursorRestore(p->pCsr, &bDiff);
+ assert( bDiff==0 || sqlite3BtreeCursorIsValidNN(p->pCsr)==0 );
+ }
+ if( sqlite3BtreeCursorIsValidNN(p->pCsr) ){
+ sqlite3_int64 iKey;
+ iKey = sqlite3BtreeIntegerKey(p->pCsr);
+ assert( v->apCsr[0]!=0 );
+ assert( v->apCsr[0]->eCurType==CURTYPE_BTREE );
+ sqlite3VdbePreUpdateHook(
+ v, v->apCsr[0], SQLITE_DELETE, p->zDb, p->pTab, iKey, -1, p->iCol
+ );
+ }
}
+ if( rc==SQLITE_OK ){
+ rc = xCall(p->pCsr, iOffset+p->iOffset, n, z);
+ }
+#else
+ rc = xCall(p->pCsr, iOffset+p->iOffset, n, z);
#endif
- rc = xCall(p->pCsr, iOffset+p->iOffset, n, z);
sqlite3BtreeLeaveCursor(p->pCsr);
if( rc==SQLITE_ABORT ){
sqlite3VdbeFinalize(v);