数据库|mysql教程
数据库,技巧,操作,人为,防止,
数据库-mysql教程
防止人为误操作MySQL数据库技巧一例
内部券网站源码,ubuntu裁剪图解,远程部署tomcat端口失败,爬虫宠物蟾蜍,php wnmp,花钱少的网络营销推广seolzw
(本题来自老男孩培训内部学生问题,属于数据库安全技巧)
易语言仓库管理源码,vscode 打开太慢,ubuntu设置串口打印,生成tomcat镜像,sqlite关取约束,js切图插件,前端页面的布局框架,python爬虫数据教学,win 安装php,url中文 seo,匿名社区网站源码,jq控制网页全屏,asp政府企业网站模板下载,jquery实现页面登录,华众6.5虚拟主机管理系统,人工神经网络bp算法源代码与演示程序lzw
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。
cpa 源码,ubuntu显示连接失败,scrapy爬虫网页新闻,llvm php,西城seo培训lzw
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 -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, , 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