防止人為誤操作MySQL數據庫技巧一例
本題來自老男孩培訓內部學生問題,屬於數據庫安全技巧)
在若干年前,老男孩親自遇到一個“命案”,老大登錄數據庫update一個記錄,結果忘了加where,於是悲劇發生了,這使得我對MySQL的增量恢復熟練度遠超過其他的知識點,同時也很在意對內的數據庫安全,並且每次講課講到此處,都會給學生講這個領導的故事。
1、mysql幫助說明
- [oldboy_c64 ~]# mysql --help|grep dummy
- -U, --i-am-a-dummy Synonym for option --safe-updates, -U.
- i-am-a-dummy FALSE
在mysql命令加上選項-U後,當發出沒有WHERE或LIMIT關鍵字的UPDATE或DELETE時,mysql程序就會拒絕執行
2、指定-U登錄測試
- [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:不加條件無法刪除,目的達到。
3、做成別名防止老大和DBA誤操作
- [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'
結論:
在mysql命令加上選項-U後,當發出沒有WHERE或LIMIT關鍵字的UPDATE或DELETE時,mysql程序拒絕執行