def close(self):
		'''关闭与数据库的连接'''
		if VERBOSE:
			print 'Database connection CLOSE.'
		self.conn.close()
def toggle_ignoring_sigint_v2_engine(cls, toggle: bool) -> None:
        assert cls._signal_handler is not None
        cls._signal_handler._toggle_ignoring_sigint_v2_engine(toggle)