MySQL系列—5.用户管理

1、MySQL用户介绍

2、用户创建

1.正常形式

2.隐式创建

3.查看用户权限

[4.root 用户创建](#4.root 用户创建)

1、MySQL用户介绍

用户名@'白名单'

比如 [email protected] [email protected]是两个不一样的用户

所有网段: 'dbadmin'@%

指定网段: 'dbadmin'@'10.%' or '192.168.%' or '172.21.120.%'

具体IP: 'dbadmin'@'192.168.120.21' 1

主机名: 'dbamdin'@localhost

#存在哪里？mysql.user即用户权限表

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select user,host from mysql.user;

2、用户创建

1.正常形式

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create user damin@'%' identified by 'xxxxx';

grant all privileges on *.* to 'damin'@'%' WITH GRANT OPTION; ; #赋 予超级权限

2.隐式创建

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grant all privileges on *.* to 'damin'@'%' identified by 'xxxxx' ;

3.查看用户权限

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mysql> show grants for 'saos_damin'@'%';

4.root 用户创建

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mysql> GRANT ALL PRIVILEGES ON *.* TO 'root'@'localhost' IDENTIFIED BY 'root' WITH GRANT OPTION;

mysql> flush privileges;

#user和privilige表中的用户信息/权限设置从mysql库(MySQL数据库的内置库)中加载到内存 里,不然其他session无法连接。

5.DML用户创建

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mysql> GRANT UPDATE, DELETE, INSERT, SELECT ON *.* TO 'test'@'%' identifie d by 'test' ；

mysql> flush privileges;

6.备份恢复用户权限

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mysql> GRANT INSERT, UPDATE, DELETE, CREATE, DROP, INDEX, ALTER,CREATE VIE W, SHOW VIEW, CREATE ROUTINE, ALTER ROUTINE, EVENT, TRIGGER ON *.* TO 'res tore'@'localhost' identified by '123456';

mysql> flush privileges;

7.复制用户

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mysql> GRANT PROCESS, REPLICATION SLAVE, REPLICATION CLIENT ON *.* TO 'rep l'@'%' IDENTIFIED BY '123456';

mysql> flush privileges;

3、用户删除

1.删除普通用户

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mysql> drop user 'USERNAME'@'HOST';

2.删除MySQL默认账户

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mysql> drop user 'root'@'127.0.0.1';

4、修改用户密码

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# MySQL 5.7

mysql> update mysql.user set authentication_string=PASSWORD('xxx') whe re user='xxxxxx';

mysql> flush privileges;

#8.0 密码修改

alter user 'xxx'@'localhost' identified with mysql_native_password by 'xxx';

5、密码找回

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#1.修改配置文件

[mysqld]

--skip-grant-tables

#2.重启MySQL

#3.设置root用户密码

mysql> alter user root@'localhost' identified by 'xxxxx';