(转)防止人为误操作MySQL数据库技巧一例

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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)

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。

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.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

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