MySQL數(shù)據(jù)庫防止人為誤操作的實例講解

更新時間：2014年06月25日 09:53:01 投稿：shichen2014

這篇文章主要介紹了MySQL數(shù)據(jù)庫防止人為誤操作的方法,需要的朋友可以參考下

有不少開發(fā)人員在操作MySQL數(shù)據(jù)庫的時候都遇到過誤操作的情況，例如更新數(shù)據(jù)庫的時候update語句忘記加上where條件，就會造成極為悲劇的結(jié)果。本文就針對防止MySQL數(shù)據(jù)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后，當(dāng)發(fā)出沒有WHERE或LIMIT關(guān)鍵字的UPDATE或DELETE時，mysql程序就會拒絕執(zhí)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(dá)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(jié)論：在mysql命令加上選項-U后，當(dāng)發(fā)出沒有WHERE或LIMIT關(guān)鍵字的UPDATE或DELETE時，mysql程序拒絕執(zhí)行

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