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
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-dummyFALSE
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 -UWelcome to the MySQL monitor. Commands end with ; or \g.Your MySQL connection id is 14Server version: 5.5.32-log MySQL Community Ser本文来源gao($daima.com搞@代@#码(网ver (GPL)Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.Oracle is a registered trademark of Oracle Corporation and/or itsaffiliates. Other names may be trademarks of their respectiveowners.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 columnmysql> quitBye
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
[oldboy_c64 ~]# alias mysql=’mysql -U'[oldboy_c64 ~]# mysql -uroot -poldboy123 -S /data/3306/mysql.sockWelcome to the MySQL monitor. Commands end with ; or \g.Your MySQL connection id is 15Server 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 columnmysql> delete from oldboy.student where Sno=5;Query OK, 1 row affected (0.02 sec)mysql> quitBye[oldboy_c64 ~]# echo “alias mysql=’mysql -U'” >>/etc/profile[oldboy_c64 ~]# . /etc/profile[oldboy_c64 ~]# tail -1 /etc/profilealias 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
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