有不少开发人员在操作MySQL数据库的时候都遇到过误操作的情况，例如更新数据库的时候update语句忘记加上where条件，就会造成极为悲剧的结果。本文就针对防止MySQL数据库误操作的方法做出如下详解：

1、mysql帮助说明

# mysql --help|grep dummy

-U, --i-am-a-dummy Synonym for option --safe-updates, -U.

i-am-a-dummy FALSE

在mysql命令加上选项-U后，当发出没有WHERE或LIMIT关键字的UPDATE或DELETE时，mysql程序就会拒绝执行

2、指定-U登录测试

# mysql -uroot -poldboy123 -S /data/3306/mysql.sock -U

Welcome to the MySQL monitor. Commands end with ; or g.

Your MySQL connection id is 14

Server version: 5.5.32-log MySQL Community Server (GPL)

Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its

affiliates. Other names may be trademarks of their respective

owners.

Type 'help;' or 'h' for help. Type 'c' to clear the current input statement.

mysql> delete from oldboy.student;

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> quit

Bye

提示：此处不加条件无法删除，目的达到。

3、做成别名防止DBA误操作

# alias mysql='mysql -U'

# mysql -uroot -poldboy123 -S /data/3306/mysql.sock

Welcome to the MySQL monitor. Commands end with ; or g.

Your MySQL connection id is 15

Server version: 5.5.32-log MySQL Community Server (GPL)

Type 'help;' or 'h' for help. Type 'c' to clear the current input statement.

mysql> delete from oldboy.student;

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> delete from oldboy.student where Sno=5;

Query OK, 1 row affected (0.02 sec)

mysql> quit

Bye

# echo "alias mysql='mysql -U'" >>/etc/profile

# . /etc/profile

# tail -1 /etc/profile

alias mysql='mysql -U'

结论：在mysql命令加上选项-U后，当发出没有WHERE或LIMIT关键字的UPDATE或DELETE时，mysql程序拒绝执行

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