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-rw-r--r--src/btree.c24
1 files changed, 24 insertions, 0 deletions
diff --git a/src/btree.c b/src/btree.c
index 00cdc9760..a931b0d12 100644
--- a/src/btree.c
+++ b/src/btree.c
@@ -5667,6 +5667,30 @@ int sqlite3BtreeFirst(BtCursor *pCur, int *pRes){
return rc;
}
+/* Set *pRes to 1 (true) if the BTree pointed to by cursor pCur contains zero
+** rows of content. Set *pRes to 0 (false) if the table contains content.
+** Return SQLITE_OK on success or some error code (ex: SQLITE_NOMEM) if
+** something goes wrong.
+*/
+int sqlite3BtreeIsEmpty(BtCursor *pCur, int *pRes){
+ int rc;
+
+ assert( cursorOwnsBtShared(pCur) );
+ assert( sqlite3_mutex_held(pCur->pBtree->db->mutex) );
+ if( pCur->eState==CURSOR_VALID ){
+ *pRes = 0;
+ return SQLITE_OK;
+ }
+ rc = moveToRoot(pCur);
+ if( rc==SQLITE_EMPTY ){
+ *pRes = 1;
+ rc = SQLITE_OK;
+ }else{
+ *pRes = 0;
+ }
+ return rc;
+}
+
#ifdef SQLITE_DEBUG
/* The cursors is CURSOR_VALID and has BTCF_AtLast set. Verify that
** this flags are true for a consistent database.