防止人为误操作MySQL数据库技巧

转载：http://oldboy.blog.51cto.com/2561410/1321061

登录数据库update一个记录，结果忘了加where，于是悲剧发生了，这使得我对MySQL的增量恢复熟练度远超过其他的知识点，同时也很在意对内的数据库安全。

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1、mysql帮助说明

[oldboy_c64 ~]# 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

[oldboy_c64 ~]# mysql -uroot -poldboy123 -S /data/3306/mysql.sock -UWelcome to the MySQL monitor. Commands end with ; or \g.Your MySQL connection id is 14Server 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 itsaffiliates. Other names may be trademarks of their respectiveowners.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 columnmysql> quitBye

提示：不加条件无法删除，目的达到。

3、做成别名防止老大和DBA误操作

[oldboy_c64 ~]# alias mysql='mysql -U'[oldboy_c64 ~]# mysql -uroot -poldboy123 -S /data/3306/mysql.sockWelcome to the MySQL monitor. Commands end with ; or \g.Your MySQL connection id is 15Server 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 columnmysql> delete from oldboy.student where Sno=5;Query OK, 1 row affected (0.02 sec)mysql> quitBye[oldboy_c64 ~]# echo "alias mysql='mysql -U'" >>/etc/profile[oldboy_c64 ~]# . /etc/profile[oldboy_c64 ~]# tail -1 /etc/profilealias 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。