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HomeDatabaseMysql Tutorialmysql错误:ERROR 1175: You are using safe update mode 解决方法_MySQL

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:

 

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:

 

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;    

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。

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