《Mysql应用MySQL数据库防止人为误操作的实例讲解》要点：
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MYSQL必读有不少开发人员在操作MySQL数据库的时候都遇到过误操作的情况,例如更新数据库的时候update语句忘记加上where条件,就会造成极为悲剧的结果.本文就针对防止MySQL数据库误操作的办法做出如下详解：
MYSQL必读1、mysql赞助说明
MYSQL必读
# mysql --help|grep dummy
-U, --i-am-a-dummy Synonym for option --safe-updates, -U.
i-am-a-dummy FALSE
MYSQL必读在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法式就会拒绝执行
MYSQL必读2、指定-U登录测试
MYSQL必读
# 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
MYSQL必读提示：此处不加条件无法删除,目的达到.
MYSQL必读3、做成别号防止DBA误操作
MYSQL必读
# alias mysql='mysql -U'
# 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
# echo "alias mysql='mysql -U'" >>/etc/profile
# . /etc/profile
# tail -1 /etc/profile
alias mysql='mysql -U'
MYSQL必读结论：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法式拒绝执行
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