def close(self):
		'''关闭与数据库的连接'''
		if VERBOSE:
			print 'Database connection CLOSE.'
		self.conn.close()
def parsed_error_msg(self):
        """
        Sometimes, the error message we've received needs to be parsed into
        something more human readable

        The default behavior is to return the current error message as is.
        """
        return self.error_msg