Node接入Mysql步骤

1、本地下载mysql服务
2、用GUI 客户端（Workbench、navicat）创建数据库，建表。
3、node 里面需要用一个驱动mysqp2连接数据库。

// get the client
const mysql = require('mysql2');
// create the connection to database
const connection = mysql.createConnection({
  host: 'localhost',
  user: 'root',
  database: 'test'
});
// simple query
connection.query(
  'SELECT * FROM `table` WHERE `name` = "Page" AND `age` > 45',
  function(err, results, fields) {
    console.log(results); // results contains rows returned by server
    console.log(fields); // fields contains extra meta data about results, if available
  }
);
// with placeholder
connection.query(
  'SELECT * FROM `table` WHERE `name` = ? AND `age` > ?',
  ['Page', 45],
  function(err, results) {
    console.log(results);
  }
)