def _savepoint_rollback(self, sid):
    if (not self.features.uses_savepoints):
        return
    self.cursor().execute(self.ops.savepoint_rollback_sql(sid))
def _savepoint_rollback(self, sid):
    if (not self.features.uses_savepoints):
        return
    self.cursor().execute(self.ops.savepoint_rollback_sql(sid))