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Remember if last cursor op was a delete

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If so, don't advance cursor on next NEXT. Also, init xcursor
on the next GET_CURRENT.
This commit is contained in:
Howard Chu 2013-09-03 16:10:20 -07:00
parent 3d59ca3558
commit 5f6fa8c042
1 changed files with 16 additions and 2 deletions
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18
libraries/liblmdb/mdb.c
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@ -933,6 +933,7 @@ struct MDB_cursor {
#define C_INITIALIZED 0x01 /**< cursor has been initialized and is valid */
#define C_EOF 0x02 /**< No more data */
#define C_SUB 0x04 /**< Cursor is a sub-cursor */
#define C_DEL 0x08 /**< last op was a cursor_del */
#define C_SPLITTING 0x20 /**< Cursor is in page_split */
#define C_UNTRACK 0x40 /**< Un-track cursor when closing */
/** @} */
@ -5006,6 +5007,8 @@ mdb_cursor_next(MDB_cursor *mc, MDB_val *key, MDB_val *data, MDB_cursor_op op)
}
DPRINTF(("cursor_next: top page is %"Z"u in cursor %p", mp->mp_pgno, (void *) mc));
if (mc->mc_flags & C_DEL)
goto skip;
if (mc->mc_ki[mc->mc_top] + 1u >= NUMKEYS(mp)) {
DPUTS("=====> move to next sibling page");
@ -5018,6 +5021,7 @@ mdb_cursor_next(MDB_cursor *mc, MDB_val *key, MDB_val *data, MDB_cursor_op op)
} else
mc->mc_ki[mc->mc_top]++;
skip:
DPRINTF(("==> cursor points to page %"Z"u with %u keys, key index %u",
mp->mp_pgno, NUMKEYS(mp), mc->mc_ki[mc->mc_top]));
@ -5432,6 +5436,8 @@ mdb_cursor_get(MDB_cursor *mc, MDB_val *key, MDB_val *data,
MDB_GET_KEY(leaf, key);
if (data) {
if (F_ISSET(leaf->mn_flags, F_DUPDATA)) {
if (mc->mc_flags & C_DEL)
mdb_xcursor_init1(mc, leaf);
rc = mdb_cursor_get(&mc->mc_xcursor->mx_cursor, data, NULL, MDB_GET_CURRENT);
} else {
rc = mdb_node_read(mc->mc_txn, leaf, data);
@ -5556,6 +5562,9 @@ fetchm:
break;
}
if (mc->mc_flags & C_DEL)
mc->mc_flags ^= C_DEL;
return rc;
}
@ -6105,6 +6114,7 @@ mdb_cursor_del(MDB_cursor *mc, unsigned int flags)
}
}
mc->mc_db->md_entries--;
mc->mc_flags |= C_DEL;
return rc;
}
/* otherwise fall thru and delete the sub-DB */
@ -7280,12 +7290,16 @@ mdb_cursor_del0(MDB_cursor *mc, MDB_node *leaf)
if (!(m2->mc_flags & C_INITIALIZED))
continue;
if (m2->mc_pg[mc->mc_top] == mp) {
if (m2->mc_ki[mc->mc_top] > ki)
m2->mc_ki[mc->mc_top]--;
if (m2->mc_ki[mc->mc_top] >= ki) {
m2->mc_flags |= C_DEL;
if (m2->mc_ki[mc->mc_top] > ki)
m2->mc_ki[mc->mc_top]--;
}
if (m2->mc_ki[mc->mc_top] >= nkeys)
mdb_cursor_sibling(m2, 1);
}
}
mc->mc_flags |= C_DEL;
}
return rc;