MySQL user management: add users, authorize, delete users, revoke permissions

table of Contents

1. Log in to the database as the root user and run the following command

Second, revoke authority

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1. Log in to the database as the root user and run the following command

1. Create the data_exchange database

create database data_exchange character set utf8; 

2. Create user kangll with a password of kangll 

CREATE USER 'kangll'@'%' IDENTIFIED BY 'kangll';

During the creation process, only the user name is given, but the host name is not specified, then the host name defaults to "%", which means a group of hosts, that is, permissions are open to all hosts.

Modify user password

update mysql.user set password = password('knagll') where user = 'knagll' and host = '%';
flush privileges;

3. Authorize kangll user to have all permissions of the data_exchange database (all permissions of a database)

grant all privileges on data_exchange.* to 'kangll'@'%' identified by 'kangll';

4. Set permissions on the data_exchange database (addition, deletion, modification, and check can be set to one or more) data_exchange: database, kangll: user

grant create, select, insert, update, delete on data_exchange.* to kangll@'%';
flush privileges;   //刷新系统权限表，即时生效

5. Delete user kangll

drop user kangll@'%';

6. Display the list of privileges authorized by kangll user

show grants for kangll@'%';

Second, revoke authority

1. Grant works on the entire MySQL server

grant select on *.* to kangll@localhost; -- kangll 可以查询 MySQL 中所有数据库中的表。 

grant all on *.* to kangll@localhost; -- knagll 可以管理 MySQL 中的所有数据库 

2. Revoke the user's authority to a database 

REVOKE privilege ON data_exchange.* FROM 'kangll'@'%';