mysql dba系统学习（15）mysql用户管理之二

一，创建和删除用户

mysql> select current_user();  查询当前的登录用户

+----------------+

| current_user() |

+----------------+

| root@localhost |

+----------------+

 创建用户的时候没有分配任何权限，%表示的是任何机器，但是不包括localhost和127.0.0.1

mysql> create user 'chenzhongyang'@'%' identified by '123456';

mysql> create user 'chen'@'127.0.0.1' identified by '123456';

删除用户

mysql> drop user 'chenzhongyang'@'%';

Query OK, 0 rows affected (0.04 sec)

[root@test4 /]# mysql -uchen -p123456 -h127.0.0.1

Welcome to the MySQL monitor.  Commands end with ; or g.

Your MySQL connection id is 4

Server version: 5.1.70-log Source distribution

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> select  user();

+----------------+

| user()         |

+----------------+

| chen@localhost |

+----------------+

1 row in set (0.01 sec)

刚刚创建的用户的权限是usage

mysql> show  grants;

+-------------------------------------------------------------------------------------------------------------+

| Grants for chen@127.0.0.1                                                                                   |

+-------------------------------------------------------------------------------------------------------------+

| GRANT USAGE ON *.* TO 'chen'@'127.0.0.1' IDENTIFIED BY PASSWORD '*6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9' |

+-------------------------------------------------------------------------------------------------------------+

1 row in set (0.02 sec)

修改用户名，这个时候密码和权限没有变化

mysql> rename  user 'chen'@'127.0.0.1'  to 'chenzhongyang'@'127.0.0.1';

二，匿名用户

创建匿名用户之后，那么任何机器的任何用户都可以登录到mysql，所以这样很危险

mysql> insert into user(host,user,password) values('%','','');

Query OK, 1 row affected, 3 warnings (0.17 sec)

mysql> flush privileges;   刷新权限将重新加载user表的内容

Query OK, 0 rows affected (0.03 sec)

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