防止人为误操作MySQL数据库技巧
防止人为误操作MySQL数据库技巧
给大家说个真实事例：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，同时也很在意对内的数据库安全，
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。
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
看完以上内容希望大家都谨慎谨慎再谨慎!还有对数据必须做好备份以备不时之需。
文章来源：多备份 www.dbfen.com