生产环境中，DBA的粗心造成的数据错误最危险，为了防止无where条件的update语句出现错误，可使用如下方法。
1、加-U登录数据库

点击(此处)折叠或打开

[root@master ~]# mysql -uroot -pmysql -U
mysql: [Warning] Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 12
Server version: 5.7.19-log Source distribution
Copyright (c) 2000, 2017, 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>
mysql> use test;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
mysql> show tables;
+----------------+
| Tables_in_test |
+----------------+
| t1 |
+----------------+
1 row in set (0.00 sec)
mysql> show create table t1;
+-------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Table | Create Table |
+-------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| t1 | CREATE TABLE `t1` (
`admin_id` int(11) NOT NULL DEFAULT '0',
`admin_name` varchar(200) NOT NULL,
`password` varchar(200) NOT NULL,
`role` int(11) NOT NULL DEFAULT '1',
`last_login_time` datetime DEFAULT NULL,
`last_login_ip` varchar(16) DEFAULT '',
`admin_status` int(11) NOT NULL DEFAULT '1',
`create_time` datetime DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8 |
+-------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)
mysql> update t1 set admin_status=1234;
ERROR 1175 (HY000): You are using safe update mode and you tried to update a table without a WHERE that uses a KEY column

此处可以看到数据库给出了提示，不允许没有where条件的update操作。
2、根据这样的特性，对系统环境变量进行更改
vi /etc/profile
alias mysql='mysql -U'
source /etc/profile
3、正常命令登录MySQL，进行测试

点击(此处)折叠或打开

[root@master ~]# mysql -uroot -pmysql
mysql: [Warning] Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 14
Server version: 5.7.19-log Source distribution
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> use test;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
mysql> update t1 set admin_status=1234;
ERROR 1175 (HY000): You are using safe update mode and you tried to update a table without a WHERE that uses a KEY column

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MySQL防止无where条件update操作

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