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登录数据库update一个记录，结果忘了加where，悲剧发生了。
今天，我们不讲如何恢复误操作的数据，我们讲讲如何从源头上避免这样的问题，这才是避免类似问题的根本措施。好了。我们直接进入主题：
1、MySQL帮助说明
- [root@liuyazhuang151 ~]# mysql
- -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
- [root@liuyazhuang151 ~]# mysql -uroot -proot -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：不加条件无法删除，目的达到。
3、做成别名防止他人和DBA误操作
- [root@liuyazhuang151 ~]# alias mysql='mysql -U'
- [root@liuyazhuang151 ~]# 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
- [root@liuyazhuang151 ~]# echo "alias mysql='mysql -U'" >>/etc/profile
- [root@liuyazhuang151 ~]# . /etc/profile
- [root@liuyazhuang151 ~]# tail -1 /etc/profile
- alias mysql='mysql -U'
4、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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