Ubuntu and MySQL quick start tutorial

Write it at the front , as everyone knows , ECS is quite popular in the era , Create your own virtual cyberspace , I am full of expectations .

This article explains the existing Cloud server Under the premise of , This paper introduces the creation of a complete database and the cognition of user management , These are contents that cannot be accessed by large companies . after , Will fully introduce how to use springboot Set up the project , And design 、 Research and development 、 Test and release a app Or a little program , Understand the process and connection matters of each link of project management .

A little flowers , Go straight to the point ：

One 、 install mysql

sudo apt update

  to update apt Indexes ;

sudo apt install mysql-server

install mysql database , All the way 【yes】 down , No password setting option ;

sudo mysql_secure_installation

Run security scripts , Password detection plug-in 、 Set the password ;

mysql -V

Show installation mysql Information about , for example ： edition 、 System ;

Two 、 modify root User login method

sudo mysql

Get into mysql database ;

SELECT user,authentication_string,plugin,host FROM mysql.user;

Show the authentication methods of all users 【 Two types of ： Password authentication 、auth_socket Plug in authentication 】;

ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY ' Your database password ';

by root User set password ;

FLUSH PRIVILEGES;

take effect ;

SELECT user,authentication_string,plugin,host FROM mysql.user;

Check whether it is effective ;

exit;

sign out ;

sudo mysql;

Report errors , Because it has been changed to password authentication login ;

mysql -u root -p

Password authentication login , Just enter the password ;

3、 ... and 、 establish 、 Delete database

mysql -u root -p;

Use root Role users log into the database ;

show databases;

Show database list ;

create database srping;

Create a srping The database of ;

create database test;

Create a test  The database of ;

show databases;

Show database list , You can see that the above two databases have been created ;

drop database test;

Delete the name test The database of ;

show databases;

Show database list , Verify that the deletion was successful ;

Four 、 Create a new user , And authorize Authority

mysql -u root -p

Input password , Login database ;

CREATE USER 'xiaochun'@'localhost' IDENTIFIED BY ' Your high-strength password ';

Create user name as xiaochun Users of , And set the password as 【 Your high-strength password 】

show grants for 'xiaochun'@'localhost';

Show spring User's rights , Because permission is not granted , You can see the default permissions ：

// GRANT USAGE ON *.* TO 'xiaochun'@'localhost'

// namely   USAGE（ Only login is allowed ）

exit;

sign out ;

mysql -u xiaochun -p

Verify whether you can log in , Input password , Login database ;

exit;

sign out ;

mysql -u root -p

Replace with root user ;

// Introduce the format of authorization command ： grant A on B to C

// A： User operation permission ,SELECT,INSERT,UPDATE,privileges,all ,USAGE（ Only login is allowed ）

// B： Authorized person ,*.*  Represents all databases, all tables ; You can also specify a database 、 Table under database

// C： user name

grant all privileges on spring.* to 'xiaochun'@'localhost';

Give to users 【xiaochun】 Give the database the name 【 spring】 All operation rights ;

flush privileges;

Refresh permission table ;

show grants for 'xiaochun'@'localhost';

Check for authorization ;

exit;

sign out ;

mysql -u xiaochun -p

Change user login ;

show grants for 'xiaochun'@'localhost';

Verify whether authorization is given ;

exit;

thus , All training items are introduced , Next class , Introduce window Connect the remote server database locally under the platform .

 

Add

Revoke user privileges

REVOKE privilege ON databasename.tablename FROM 'username'@'host';

explain :

privilege, databasename, tablename： Same authorization part

Example :

REVOKE SELECT ON *.* FROM 'pig'@'%';

Set and change user passwords

SET PASSWORD FOR 'username'@'host' = PASSWORD('newpassword');

If it is the current login user :

SET PASSWORD = PASSWORD("newpassword");

Example :

SET PASSWORD FOR 'pig'@'%' = PASSWORD("123456");