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 程式師世界 >> 數據庫知識 >> MYSQL數據庫 >> 關於MYSQL數據庫 >> MySQL數據庫防止人為誤操作的實例講解

MySQL數據庫防止人為誤操作的實例講解

編輯:關於MYSQL數據庫

有不少開發人員在操作MySQL數據庫的時候都遇到過誤操作的情況,例如更新數據庫的時候update語句忘記加上where條件,就會造成極為悲劇的結果。本文就針對防止MySQL數據庫誤操作的方法做出如下詳解:

1、mysql幫助說明

# 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

# 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:此處不加條件無法刪除,目的達到。

3、做成別名防止DBA誤操作

# alias mysql='mysql -U' 
# 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 
# echo "alias mysql='mysql -U'" >>/etc/profile 
# . /etc/profile 
# 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

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