def close(self):
		'''关闭与数据库的连接'''
		if VERBOSE:
			print 'Database connection CLOSE.'
		self.conn.close()
def normalizerootdir(dir, funcname):
    if dir == ".":
        util.nouideprecwarn(
            "match.%s() no longer accepts '.', use '' instead." % funcname, "20190805"
        )
        return ""
    return dir