def savepoint_rollback(self, sid):
        if not self._savepoint_allowed():
            return

        self.validate_thread_sharing()
        self._savepoint_rollback(sid)
Rolls back to a savepoint. Does nothing if savepoints are not supported.
dataset/ETHPy150Open cloudera/hue/desktop/core/ext-py/Django-1.6.10/django/db/backends/__init__.py/BaseDatabaseWrapper.savepoint_rollback