Introduction to DCL

1 Introduction

The full name of DCL in English is (Data Control Language), which is used to manage database users and control database access permissions.

2. DCL management users

• Query user

Use mysql;
select * from user;

• Create user

create user '用户名'@'主机名' Identified by '密码'

• Change user password

alter user '用户名'@'主机名' identified with mysql_native_password by '新密码'

• delete users

drop user '用户名'@'主机名'

MySQL user information is stored in the user table of the MySQL system database.

3. DCL permission control

After creating a new user, its permissions will be restricted, causing many functions of the database to be unavailable. Here you can use DCL permission control statements to control the user's permissions. There are many permissions defined in mysql, but the most commonly used ones are as follows:

Permissions	illustrate
ALL,ALL PRIVILEGES	All permissions
Select	Query data
Insert	Insert data
update	change the data
Delete	delete data
alter	Modify table
drop	Delete database/table/view
create	Create database/table

• Query permissions

Show grants for '用户名'@'主机名'

• Granted permission

grant 权限列表 on 数据库名.表名 to '用户名'@'主机名'

• revoke permission

revoke 权限列表 on 数据库名.表名 from '用户名'@'主机名'