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[1.3.x] Fixed #16481 -- Adapted one raw SQL query in cull implementation of the database-based cache backend so it works with Oracle. Backport of r16635 from trunk. 

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.3.X@17805 bcc190cf-cafb-0310-a4f2-bffc1f526a37
This commit is contained in:
Aymeric Augustin 2012-03-24 12:26:46 +00:00
parent fd2efb35fb
commit 8e73302070
1 changed files with 7 additions and 1 deletions
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8
django/core/cache/backends/db.py vendored
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@ -132,7 +132,13 @@ class DatabaseCache(BaseDatabaseCache):
cursor.execute("SELECT COUNT(*) FROM %s" % table) cursor.execute("SELECT COUNT(*) FROM %s" % table)
num = cursor.fetchone()[0] num = cursor.fetchone()[0]
if num > self._max_entries: 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]]) cursor.execute("DELETE FROM %s WHERE cache_key < %%s" % table, [cursor.fetchone()[0]])
def clear(self): def clear(self):