MySQL 的 Safe Update Mode

删除mysql 的一个表的数据的时候报告如下错误：

mysql> delete from upload_images;

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

 

 

mysql> show variables like '%sql_safe%';

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

| Variable_name    | Value |

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

| sql_safe_updates | ON    |

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

1 row in set (0.00 sec)

 

 

 

mysql> set sql_safe_updates=0;

 

Query OK, 0 rows affected (0.00 sec)

 

mysql> show variables like '%sql_safe%';

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

| Variable_name    | Value |

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

| sql_safe_updates | OFF   |

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

1 row in set (0.00 sec)

 

mysql> delete from upload_images;

Query OK, 505 rows affected (0.01 sec)

 

然后再启用safe mode 

mysql> set sql_safe_updates=1;