防止人为误操作MySQL数据库解决方法
时间：2015-06-26 阅读：次 QQ群：182913345
若干年前遇到一个“命案”，老大登录数据库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，并且每次讲课讲到此处，都会给学生讲这个领导的故事。
1、mysql帮助说明
1. [oldboy_c64 ~]# mysql --help|grep dummy
2. -U, --i-am-a-dummy Synonym for option --safe-updates, -U.
3. 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
1. [oldboy_c64 ~]# mysql -uroot -poldboy123 -S /data/3306/mysql.sock -U
2. Welcome to the MySQL monitor. Commands end with ; or \g.
3. Your MySQL connection id is 14
4. Server version: 5.5.32-log MySQL Community Server (GPL)
5. Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
6. Oracle is a registered trademark of Oracle Corporation and/or its
7. affiliates. Other names may be trademarks of their respective
8. owners.
9. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
10. mysql> delete from oldboy.student;
11. ERROR 1175 (HY000): You are using safe update mode and you tried to update a table without a WHERE that uses a KEY column
12. mysql> quit
13. Bye
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
1. [oldboy_c64 ~]# alias mysql='mysql -U'
2. [oldboy_c64 ~]# mysql -uroot -poldboy123 -S /data/3306/mysql.sock
3. Welcome to the MySQL monitor. Commands end with ; or \g.
4. Your MySQL connection id is 15
5. Server version: 5.5.32-log MySQL Community Server (GPL)
6. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
7. mysql> delete from oldboy.student;
8. ERROR 1175 (HY000): You are using safe update mode and you tried to update a table without a WHERE that uses a KEY column
9. mysql> delete from oldboy.student where Sno=5;
10. Query OK, 1 row affected (0.02 sec)
11. mysql> quit
12. Bye
13. [oldboy_c64 ~]# echo "alias mysql='mysql -U'" >>/etc/profile
14. [oldboy_c64 ~]# . /etc/profile
15. [oldboy_c64 ~]# tail -1 /etc/profile
16. 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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