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Fixed #16481 -- Adapted one raw SQL query in cull immplementation of the database-based cache backend so it works with Oracle. Thanks Aymeric Augustin for the report and patch.
git-svn-id: http://code.djangoproject.com/svn/django/trunk@16635 bcc190cf-cafb-0310-a4f2-bffc1f526a37
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django/core/cache/backends/db.py
vendored
8
django/core/cache/backends/db.py
vendored
@ -135,7 +135,13 @@ class DatabaseCache(BaseDatabaseCache):
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cursor.execute("SELECT COUNT(*) FROM %s" % table)
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num = cursor.fetchone()[0]
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if num > self._max_entries:
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cursor.execute("SELECT cache_key FROM %s ORDER BY cache_key LIMIT 1 OFFSET %%s" % table, [num / self._cull_frequency])
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cull_num = num / self._cull_frequency
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if connections[db].vendor == 'oracle':
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# Special case for Oracle because it doesn't support LIMIT + OFFSET
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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])
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else:
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# This isn't standard SQL, it's likely to break with some non officially supported databases
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cursor.execute("SELECT cache_key FROM %s ORDER BY cache_key LIMIT 1 OFFSET %%s" % table, [cull_num])
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cursor.execute("DELETE FROM %s WHERE cache_key < %%s" % table, [cursor.fetchone()[0]])
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def clear(self):
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