[MySQL Self-study Road] Day 3 - Basic Operation of MySQL Database Service

Table of contents

foreword

Database initialization

Add environment variables

Compilation of database configuration file [my.ini]

Initialize the MySQL service

MySQL service operation

Install a MySQL service

Delete a MySQL service

Start your MySQL service

Shut down your MySQL service

View the MySQL service existing in the computer

other operations

login database

change Password

Login skip password verification

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foreword

In the previous section, we mentioned the relational operations between relational database database data, including basic union, difference, intersection, and Cartesian product operations, as well as complex relational operations such as selection, projection, connection, and division.

In this section, we mainly describe the basic operations of the MySQL database service, such as the opening, closing, and initialization of the MySQL service.

Note: If you have already configured the MySQL database, you can directly read the next chapter!

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Database initialization

The initialization here refers to starting from the download of the database compressed package.

Note: Here I put the compressed package of the database in C :\Program Files\mysql-5.7.36-winx64

Add environment variables

This step is essential, I believe you are already very proficient in configuring environment variables. 

计算机 --> 属性 --> 高级系统设置 --> 高级 --> 环境变量 --> 系统变量 --> Path Add the following path to:

C:\Program Files\mysql-5.7.36-winx64\bin

Compilation of database configuration file [my.ini]

After you download the compressed file, you need to write a my.ini configuration file and place it under the  C:\Program Files\mysql-5.7.36-winx64 directory:

Note:

1. There was no data folder at the beginning. 

 2. # in the configuration file represents comments

[mysqld]

port=3306

basedir=C:\\Program Files\\mysql-5.7.36-winx64

datadir=C:\\Program Files\\mysql-5.7.36-winx64\\data

You can also add in the configuration file:

[client]
default-character-set=utf8

 To set the default character set of the mysql client.

Note: Every time the my.ini configuration file is modified, the MySQL service must be restarted, otherwise it will not take effect.

Initialize the MySQL service

Note: The following steps are best run under cmd with administrator privileges.

Initialize MySQL (first login)

mysqld --initialize --console

Note: You will be given a string of passwords after execution, which is the initial password, please keep it in mind. 

Install MySQL (first login)

mysqld install

Note: After installing MySQL, you need to start the service. If you are in the process of installing MySQL, just look down. 

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MySQL service operation

If you have installed MySQL, you need to start the service.

If your MySQL service is down. You need to enable the service.

Note: It is best to use a command window with administrator privileges for the following operations.

Install a MySQL service

At this time, there may not be a MySQL service on your computer, so you need to install a MySQL service.

mysqld --install [服务名]
# 例如：mysqld --install mysql

Delete a MySQL service

If you are not satisfied with your MySQL service name, you can delete it.

sc delete [服务名]
# 例如：sc delete mysql

Start your MySQL service

net start [服务名]
# 例如：net start mysql

Note: If the net command is not recognized.

 please try:

.\net start [服务名]

Shut down your MySQL service

net stop [服务名]
# 例如：net stop mysql

NOTE: If the net command is not recognized, try:

.\net stop [服务名]

View the MySQL service existing in the computer

(1) Open the task manager

(2) Click on the service in the upper column

(3) Find out if there is a MySQL service in it.

 (4) Right-click a service and click to view details

(5) Check whether it is enabled by mysqld.exe:

 If yes, the service is the one started by MySQL.

 If it is not found, it means that the MySQL service has not been installed in the computer.

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other operations

login database

Prerequisite: Open the database service

mysql -h 主机名 -P 端口号 -u 用户名 -p 密码

Shorthand: (directly log in as the root user)

mysql -u root -p

change Password

If you are using the database for the first time, you need to change the password after you start the service, otherwise you cannot use any functions in it.

Method 1: Use mysqladmin.exe (no need to enter MySQL, but need to know the original password)

mysqladmin -u 用户名 -p 旧密码 password 新密码

Method 2: Use SQL statement (need to enter MySQL)

set password for username@localhost = password(newpwd);
# 例如：set password for root@localhost = password(123456);

Note: There are many ways to change the password, only 2 are listed here.

Login skip password verification

The MySQL database supports skipping password verification. It is not that you have to enter the password, but you can enter the database no matter what you enter.

Modify the my.ini configuration file to add:

skip-grant-tables

For example:

Note: After modifying the configuration file, you must restart the service, otherwise it will not take effect.