def close(self):
		'''关闭与数据库的连接'''
		if VERBOSE:
			print 'Database connection CLOSE.'
		self.conn.close()
def do_register_cli_opts(opt, ignore_errors=False):
    # TODO: This function has broken name, it should work with lists :/
    if not isinstance(opt, (list, tuple)):
        opts = [opt]
    else:
        opts = opt

    try:
        cfg.CONF.register_cli_opts(opts)
    except:
        if not ignore_errors:
            raise