Let's talk about the installation and use of MySQL

MySQL is an open source relational database management system. It is one of the most popular databases currently. It has the characteristics of high performance, high reliability, and easy expansion, so it is widely used in the infrastructure of Web applications.

In this article, we will introduce the installation and use of MySQL, and explain in detail how to create a database, create a table, and operate the table.

1. Install MySQL

MySQL official website provides a variety of different installation methods and versions. Users can choose the appropriate installation method according to their own operating system and needs.

1. Installing MySQL on Windows platform

You can download the installation package in .msi format from the official website for direct installation. During the installation process, you need to pay attention to the following points:

a. When installing, you need to set the root user's password yourself. This password is very important. It is not only the MySQL access password, but also the password of the MySQL super administrator.

b. You need to decide whether to install the full version of MySQL based on your own needs. The full version of MySQL includes the MySQL server and client.

c. During the installation process, you need to select the path and file name of the slow query log, error log and other information. It is recommended to place them in the logs folder in the installation directory.

2. Installing MySQL on MacOS platform

You can install MySQL through Homebrew and other tools. The installation method is as follows:

a. Open a terminal window and enter the following command ：

brew install mysql

b. After the installation is complete, the terminal will prompt the MySQL default configuration file path and the root user's randomly generated password.

c. You can start the MySQL service through the following command:

mysql.server start

3. Linux platform to install MySQL

You can use Source code compilation and binary package installation methods are used to install. The commonly used binary package installation method is to use the yum command. Use the following command to install MySQL in the CentOS system:

yum install mysql-server mysql

installation After completion, you can use the following command to start the MySQL service:

service mysqld start

2. Use MySQL

1. to create the database

First You need to use the command line tool provided by MySQL to connect to the MySQL server. The command is as follows:

mysql -u root -p

After entering the password of the root user set previously, you can enter MySQL at the command line prompt.

Next, you can use the following command to create a database:

create database testdb;

This command will create a database named testdb.

2. Create data table

After creating the database, you need to create tables in the database. Data tables are important objects used to store and manage data.

Use the following command to create a table named users:

use testdb; // Use the testdb database just created
create table users(

id int primary key auto_increment,
name varchar(50),
age int,
email varchar(100)

);

In this command, use the use command to select the testdb database and create a table named users, which includes four fields: id, name, age, and email.

3. Operation on the data table

After successfully creating the data table, you can add, delete, modify, query, etc. to the data table.

3.1 Insert data

Use the following command to insert a record into the users table:

insert into users(name, age, email) values('Tom', 18, 'tom@email.com');

This command will insert a record into the users table, including three fields: name, age, and email.

3.2 Query data

Use the following command to query all records in the users table:

select * from users;

This command will query the users table all records in and return the results to the command line prompt.

3.3 Update data

Use the following command to update the record with id 1 in the users table:

update users set name='Tony', age=20, email=' tony@email.com' where id=1;

This command will update the name, age, and email fields of the record with id 1 to the specified values.

3.4 Delete data

Use the following command to delete the record with id 1 in the users table:

delete from users where id=1;

This command The record with id 1 will be deleted.

Conclusion:

MySQL is a powerful database management system. Its installation and use are very simple. You only need to follow the steps described in this article. Through MySQL, we can easily manage various data, including website data, application data, etc. At the same time, MySQL also provides a rich storage engine and functional modules to meet users with different needs.

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