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HomeWeb Front-endJS TutorialHow to install mysql module in nodejs

How to install the mysql module in nodejs: 1. Open the cmd window and execute the "npm install -g cnpm" command to install the cnpm tool; 2. Use the cd command to enter the project directory and execute "cnpm install mysql" in the project command to install the MySQL module.

How to install mysql module in nodejs

The operating environment of this tutorial: windows7 system, nodejs version 12.19.0, Dell G3 computer.

node installation and configuration Mysql module

①Install Mysql module

cmd install Taobao image

npm install -g cnpm

Enter the project directory and install the MySQL module in the project

cnpm install mysql

②. Configure environment variables

Add C:\Program Files\MySQL\MySQL Server 8.0\bin
to the environment variables. The variable name can be arbitrary. For example, mysql_home
variable value is C:\Program Files\MySQL\MySQL Server 8.0\bin

③. Error report

Client does not support authentication protocol requested by server

1. Enter the decompressed mysql root directory through the command line (C:\Program Files\MySQL\MySQL Server 8.0\bin)Down.

2. Log in to the database

mysql -u root -p

3. Enter the root password

Enter password: ******

4. Change the encryption method

mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'password' PASSWORD EXPIRE NEVER;

5. Change the password: In this example 123456 is the new password

mysql> ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY '123456';

6. Refresh:

mysql> FLUSH PRIVILEGES;

④.js file format

    var mysql = require('mysql');//引用Mysql
    var connection = mysql.createConnection({//配置连接
        host: 'localhost',//数据库地址
        user : "xxx",//数据库用户
        password: "xxx",//数据库密码
        database : "world"//需要连接的数据库
    });
    
    connection.connect();//连接数据库
    
    connection.query('select * from city',function(err,rows,fields){//执行sql语句
        if(err) throw err ;
        console.log('thesolution is:' ,rows[0]);
    });
    
    connection.end();//断开连接

[Recommended learning: "nodejs tutorial"]

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