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.

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

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