DCL statement of MySQL Foundation

DCL（Data Control Language） sentence ： Data control statement .

purpose ： Control database 、 surface 、 Field 、 User Access and security levels .

Common keywords ：grant、revoke etc.

It is generally used to manage the permissions of databases and users ​, Learn from practical examples grant（ Assign permissions ） and  revoke（ Take back authority ）

Take a common example , This example will be useful in the future

Example ： Assign permissions to a user for a database

The database server in a company may run databases of many projects at the same time . therefore , We should be able to Create different users according to different projects , Assign different permissions To manage and maintain the database .

create user 'usertest'@'%' indentified by '123456';
grant all privileges on mydb.* to 'usertest'@'%';

-- View the user's permissions 
show grants for 'usertest'@'%';

user usertest Yes mydb The database has all permissions （ALL PRIVILEGES）

Revoke delete permission

revoke delete on mydb.* from 'usertest'@'%'

Switch back to the root, Re execution revoke command

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-- View the user's permissions 
show grants for 'usertest'@'%';

In addition to deleting permissions , Other permissions are . You can also see here , A user has many operation permissions ​, And these permissions can be assigned independently .​

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