Additions and deletions to the authorized user of mysql

First, the additions and deletions to new users

1. Add a new user

Allow local IP access to the localhost Mysql database:

mysql> create user 'common'@'localhost' identified by '123456';
Query OK, 0 rows affected (0.07 sec)

Allowing access to the external network IP database editest, this command contains the above order, all the database can access the IP

mysql> create user 'common'@'%' identified by '123456';
Query OK, 0 rows affected (0.06 sec)

After the user is created, refresh the authorization

mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)

2. Delete user

drop user "用户名"@"IP地址";

3. Modify the user

rename user "用户名"@"ip地址" to "新用户名"@"IP地址";

4. Change Password

set password for "用户名"@"ip地址" = password("新密码");

Second, the user authorization

1. Check the permissions

show grants for "用户名"@"ip地址";

2. Authorizes all permissions for a user, in addition to grant this order, grant only root can use the command

grant all privileges on db1.b1 to "用户名"@"%";　　某一个用户可以对db1下的b1表进行任何操作.

grant all privileges on db1.* to "用户名"@"%";　　某一个用户可以在任何ip下对db1数据库进行任何操作

grant all privileges on *.* to "用户名"@"%";　　某一个用户可以在任何ip下对任何数据库进行任何操作

3. deauthorize

revoke all on *.* from "用户名"@"%"　　取消某一个用户的全部权限

revoke all on db1.b1 from "用户名"@"%"　　取消某一个用户对db1下的b1表的所有授权

revoke select on db1.b1 from "用户名"@"%"　　取消某一个用户对db1下的b1表的查询授权