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
[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 [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。
[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 原文链接：http://oldboy.blog.51cto.com/2561410/1321061