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Fixed #18330 - Made cache culling 3rd party db backend friendly

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This is Ian Kelly's patch from #15580 with minor modifications.
This commit is contained in:
Anssi Kääriäinen
2012-07-05 17:20:48 +03:00
parent 0f49b2bce2
commit d3c2eb103f
3 changed files with 20 additions and 11 deletions
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14
django/core/cache/backends/db.py vendored
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@@ -167,17 +167,9 @@ class DatabaseCache(BaseDatabaseCache):
num = cursor.fetchone()[0]
if num > self._max_entries:
cull_num = num / self._cull_frequency
if connections[db].vendor == 'oracle':
# Oracle 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(
connections[db].ops.cache_key_culling_sql() % table,
[cull_num])
cursor.execute("DELETE FROM %s "
"WHERE cache_key < %%s" % table,
[cursor.fetchone()[0]])