diff options
| -rw-r--r-- | django/core/cache/backends/db.py | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/django/core/cache/backends/db.py b/django/core/cache/backends/db.py index fb05851e4b..af343ffc5d 100644 --- a/django/core/cache/backends/db.py +++ b/django/core/cache/backends/db.py @@ -135,7 +135,13 @@ class DatabaseCache(BaseDatabaseCache): cursor.execute("SELECT COUNT(*) FROM %s" % table) num = cursor.fetchone()[0] if num > self._max_entries: - cursor.execute("SELECT cache_key FROM %s ORDER BY cache_key LIMIT 1 OFFSET %%s" % table, [num / self._cull_frequency]) + cull_num = num / self._cull_frequency + if connections[db].vendor == 'oracle': + # Special case for Oracle because it doesn't support LIMIT + OFFSET + cursor.execute("SELECT cache_key FROM (SELECT ROW_NUMBER() OVER (ORDER BY cache_key) AS counter, cache_key FROM %s) WHERE counter > %%s AND COUNTER <= %%s" % table, [cull_num, cull_num + 1]) + else: + # This isn't standard SQL, it's likely to break with some non officially supported databases + cursor.execute("SELECT cache_key FROM %s ORDER BY cache_key LIMIT 1 OFFSET %%s" % table, [cull_num]) cursor.execute("DELETE FROM %s WHERE cache_key < %%s" % table, [cursor.fetchone()[0]]) def clear(self): |