MYSQL创建函数出错如何解决

-- 查看是否开启创建函数的功能
show variables like '%func%';
-- 开启创建函数的功能
set global log_bin_trust_function_creators = 1;

DROP FUNCTION IF EXISTS `nextval`;
DELIMITER ;;
CREATE DEFINER=`devop`@`%` FUNCTION `nextval`(`seq_name` VARCHAR(50)) RETURNS varchar(20) CHARSET utf8
BEGIN 
 DECLARE seq_max BIGINT(20);
 UPDATE sequenceconftable SET `max` = `max` + NEXT WHERE NAME = seq_name; 
 SELECT `max` INTO seq_max FROM sequenceconftable WHERE NAME = seq_name ;
 RETURN seq_max; 
END
;;
DELIMITER ;

ERROR 1418 (HY000): 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)

mysql> show variables like '%fun%'; 
+---------------------------------+-------+ 
| Variable_name     | Value | 
+---------------------------------+-------+ 
| log_bin_trust_function_creators | ON | 
+---------------------------------+-------+ 
1 row in set (0.00 sec) 
 
mysql> set global log_bin_trust_function_creators=1;        
Query OK, 0 rows affected (0.00 sec) 
 
mysql> show variables like '%fun%';            
+---------------------------------+-------+ 
| Variable_name     | Value | 
+---------------------------------+-------+ 
| log_bin_trust_function_creators | ON | 
+---------------------------------+-------+ 
1 row in set (0.00 sec)

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)  
(0 ms taken)

> set global log_bin_trust_function_creators ＝ 1;
> start slave;