Funcionamiento básico de las conexiones MySQL Node.js

// npm init -y && npm i mysql
const mysql = require('mysql');

// 创建连接对象
const connection = mysql.createConnection({
  host: 'localhost',
  user: 'root',
  password: '',
  post: '3306',
  database: 'myblog'
});

// 开始连接
connection.connect();

// 执行SQL语句
const sql = 'select * from users;';
connection.query(sql, (err, res) => {
  if (err) {
    console.log(err);
    return;
  } else {
    console.log(res);
  }
});

// 关闭连接
connection.end();