Home Database Mysql Tutorial MYSQL 创建函数出错的解决方案_MySQL

MYSQL 创建函数出错的解决方案_MySQL

Jun 01, 2016 am 11:52 AM

在使用MySQL数据库时,有时会遇到MySQL函数不能创建的情况。下面就教您一个解决MySQL函数不能创建问题的方法,供您借鉴参考。

案例一:

目前在项目中,执行创建mysql的函数出错,

mysql 创建函数出错信息如下:

Error Code: 1227. Access denied; you need (at least one of) the SUPER privilege(s) for this operation

首先检查创建函数的功能是否开启,检查是否开启创建功能的SQL如下:

-- 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;
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执行完SQL之后发现已经开启了,随检查自己的SQL是否写错(因为SQL是别人给的,在别人环境没问题,在自己的环境就有可能)。

突然发现了确实是SQL出现问题,由于他创建的SQL有指定用户,所以导致出现问题,以下是他的SQL:

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 ;
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由于CREATE_FUNCTION规范,可以发现就是DEFINER这个参数是可以指定数据库用户的,但是自己的库却不是这个用户,所以导致问题。

目前问题已经解决。

-EOF-

案例二:

在MySQL创建用户自定义函数时,报以下错误:

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)
Copy after login

这是因为有一个安全参数没有开启,log_bin_trust_function_creators 默认为0,是不允许function的同步的,开启这个参数,就可以创建成功了。

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) 
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如果是在有master上开启了该参数,记得在slave端也要开启这个参数(salve需要stop后再重新start),否则在master上创建函数会导致replaction中断。

案例三:

Error Code : 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)  
(0 ms taken) 
Copy after login

分析:

根据系统提示,导致该错误的原因可能是一个安全设置方面的配置,查手册log_bin_trust_function_creators参数缺省0,是不允许function的同步的,一般我们在配置repliaction的时候,都忘记关注这个参数,这样在master更新funtion后,slave就会报告错误,然后slave stoped。

处理过程:

登陆mysql数据库

> set global log_bin_trust_function_creators = 1;
> start slave;
Copy after login

跟踪mysql的启动日志,slave正常运行,问题解决。

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