MySQL数据库防止人为误操作的实例讲解

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

1. # mysql --help|grep dummy  
   
2. -U, --i-am-a-dummy Synonym for option --safe-updates, -U.
   
3. i-am-a-dummy  FALSE
   

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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. # 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

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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

1. # alias mysql='mysql -U'
   
2. # 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. # echo "alias mysql='mysql -U'" >>/etc/profile
    
14. # . /etc/profile
    
15. # tail -1 /etc/profile
    
16. alias mysql='mysql -U'

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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