本篇文章为大家展示了MySQL中怎么防止无where条件的update操作，内容简明扼要并且容易理解，绝对能使你眼前一亮，通过这篇文章的详细介绍希望你能有所收获。

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

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> 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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