Home Database Mysql Tutorial MySQL错误:ERROR 1175: You are using safe update mode 解决方法

MySQL错误:ERROR 1175: You are using safe update mode 解决方法

Jun 07, 2016 pm 02:59 PM

操作MySQL数据库,删除表中的某一行数据提示如下错误:ERROR 1175 (HY000): You are using safe update mode and you tried to u

MySQL错误:ERROR 1175: You are using safe update mode 解决方法

[日期:2015-09-14] 来源:Linux社区  作者:mofansheng [字体:]

操作MySQL数据库,,删除表中的某一行数据提示如下错误:ERROR 1175 (HY000): You are using safe update mode and you tried to update a table without a WHERE that uses a KEY column 

错误提示:正在使用安全更新模式,尝试更新表没有使用键列的where条件; 

原因是:mysql有个叫SQL_SAFE_UPDATES的变量,为了数据库更新操作的安全性,此值默认为1,所以才会出现更新失败的情况。 

举例如下:

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mysql> select * from test;

+----+--------+

| id | name   |

+----+--------+

|  1 | anglea |

|  2 | baby   |

|  3 | jerry  |

|  4 | tom    |

|  5 | yong   |

+----+--------+

 

mysql> delete from test where name='yong'; 

ERROR 1175 (HY000): You are using safe update mode and you tried to update a table without a WHERE that uses a KEY column

查看设置:

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mysql> show variables like 'sql_safe%';

+------------------+-------+

| Variable_name    | Value |

+------------------+-------+

| sql_safe_updates | ON    |

+------------------+-------+

下面是SQL_SAFE_UPDATES变量为0和1时的取值说明:

SQL_SAFE_UPDATES有两个取值0和1, 或ON 和OFF;

SQL_SAFE_UPDATES = 1,ON时,不带where和limit条件的update和delete操作语句是无法执行的,即使是有where和limit条件但不带key column的update和delete也不能执行。 

SQL_SAFE_UPDATES =0,OFF时,update和delete操作将会顺利执行。那么很显然,此变量的默认值是1。 

所以,出现1175错误的时候,可以先设置SQL_SAFE_UPDATES的值为0 OFF,然后再执行更新;

以下2条命令都可以;

mysql> set sql_safe_updates=0; 

mysql> set sql_safe_updates=off;    

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mysql> show variables like 'sql_safe%';

+------------------+-------+

| Variable_name    | Value |

+------------------+-------+

| sql_safe_updates | OFF   |

+------------------+-------+

 

mysql> delete from test where name='yong';

Query OK, 1 row affected (0.00 sec)

更改只在当前生效,退出mysql,再次登录后恢复为默认。

本文永久更新链接地址

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