MySQL自定义函数时报错[Err] 1418

今天在我执行自定义MySQL函数的SQL时发生了错误，SQL如下：/**
自定义mysql函数 getChildList
*/
delimiter //
CREATE FUNCTION `pengwifi_wifi`.`getChildList`（rootId INT）
RETURNS varchar（1000）BEGIN
DECLARE sTemp VARCHAR（1000）;
DECLARE sTempChd VARCHAR（1000）;SET sTemp = "$";
SET sTempChd =cast（rootId as CHAR）;WHILE sTempChd is not null DO
SET sTemp = concat（sTemp,",",sTempChd）;
SELECT group_concat（id） INTO sTempChd FROM hui_class where FIND_IN_SET（parent_id,sTempChd）>0;
END WHILE;
RETURN sTemp;
END
//报错信息： [Err] 1418 - This function has none of DETERMINISTIC, NO SQL, or READS SQL DATA in its declaration and binary logging is enabled （you *might* want to use the less safe log_bin_trust_function_creators variable）解决方法：set global log_bin_trust_function_creators=TRUE;本文永久更新链接地址