Fixed #19896 -- Committed after clearing cache in the database.

        table = connections[db].ops.quote_name(self._table)

        cursor = connections[db].cursor()

        cursor.execute('DELETE FROM %s' % table)

        transaction.commit_unless_managed(using=db)

# For backwards compatibility

class CacheClass(DatabaseCache):

from django.core.cache import get_cache

from django.core.cache.backends.base import (CacheKeyWarning,

    InvalidCacheBackendError)

from django.db import router

from django.db import router, transaction

from django.http import (HttpResponse, HttpRequest, StreamingHttpResponse,

    QueryDict)

from django.middleware.cache import (FetchFromCacheMiddleware,

                interactive=False

            )

    def test_clear_commits_transaction(self):

        # Ensure the database transaction is committed (#19896)

        self.cache.set("key1", "spam")

        self.cache.clear()

        transaction.rollback()

        self.assertEqual(self.cache.get("key1"), None)

@override_settings(USE_TZ=True)

class DBCacheWithTimeZoneTests(DBCacheTests):