def close(self):
		'''关闭与数据库的连接'''
		if VERBOSE:
			print 'Database connection CLOSE.'
		self.conn.close()
def do_register_opts(opts, group=None, ignore_errors=False):
    try:
        cfg.CONF.register_opts(opts, group=group)
    except:
        if not ignore_errors:
            raise