(转)防止人为误操作MySQL数据库技巧一例

时间:2021-12-28 20:38:38
原创作品,允许转载,转载时请务必以超链接形式标明文章 原始出处 、作者信息和本声明。否则将追究法律责任。http://oldboy.blog.51cto.com/2561410/1321061

防止人为误操作MySQL数据库技巧一例
(本题来自老男孩培训内部学生问题,属于数据库安全技巧)

在若干年前,老男孩亲自遇到一个“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
2
3
[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

1
2
3
4
5
6
7
8
9
10
11
12
13
[oldboy_c64 ~]# 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: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
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
[oldboy_c64 ~]# alias mysql='mysql -U'
[oldboy_c64 ~]# 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
[oldboy_c64 ~]# echo "alias mysql='mysql -U'" >>/etc/profile
[oldboy_c64 ~]# . /etc/profile
[oldboy_c64 ~]# 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

本文出自 “老男孩linux培训” 博客,请务必保留此出处http://oldboy.blog.51cto.com/2561410/1321061