How to manage database users

Table of contents

1. Database user management

Create new user

Query users in database

Rename username

delete users

Modify current user password

Change other user's password

2. Database user authorization

Authorize

Allow users to remotely connect to MySQL on a specified terminal and have specified permissions

revoke permission

Summary of authorized user rights

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1. Database user management

Create new user

Command: create user 'username'@'source address' identified by 'password';

Query users in database

Instruction: use mysql;

select user,authentication_string,host from user;

Rename username

Command: rename user 'username'@'source address' to 'new username'@'source address';

delete users

Command: drop user 'username'@'source address';

Modify current user password

Command: set password=password('password');

Change other user's password

Command: set password for 'username'@'localhost'=password('password');

2. Database user authorization

Authorize

The Grant statement is specially used to set the access permissions of database users. When the specified user name does not exist, the Grant statement will create a new user. When the specified user name exists, the Grant statement is used to modify the user information. The status list is divided into For Select (query), update (modify), and insert (insert) permissions, use ALL to represent all permissions

Command: grant [permission] on [database name].[table name] to 'username'@'localhost' identified by 'password';

Only give query permission, and then log in to test whether there are other permissions.

Command: quit to exit

mysql -u username -p password

use lfh;

select * from lfh;

update lfh set a=10 where e=400;

Allow users to remotely connect to MySQL on a specified terminal and have specified permissions

Command: grant [permission] privileges on [database].[table name] to 'username'@'source address' identified by 'password';

show grants for 'username'@'source address'; #View the specified corresponding permissions

revoke permission

The Usage permission can only be used for database login and cannot perform any operations. The Usage permission cannot be revoked.

Command: revoke [permission] on [database name].[table name] from 'username'@'source address';

Summary of authorized user rights

insert #insert

select #query

update #modify

delete #Delete field content

drop #Delete libraries and tables

create #Create libraries and tables

index #Create index

alter #Change table attributes

create view #Create view

create routine #Create stored procedure

alter routine #Modify stored procedure

event #event

trigger on #Create desolver