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
-
-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。 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
(责任编辑:最模板) |