var mysql = require('mysql'); //調用MySQL模塊 mysql模塊要安裝 $ npm install mysql//創建一個connectionvar connection = mysql.createConnection({  host   : '127.0.0.1',    //主機  user   : 'root',        //MySQL認證用戶名  password : '',    //MySQL認證用戶密碼  port: '3306',          //端口號  database:''   //數據庫名});//創建一個connectionconnection.connect(function(err){  if(err){    console.log('[query] - :'+err);    return;  }  console.log('[connection connect] succeed!');});//執行SQL語句connection.query('SELECT 1 + 1 AS solution', function(err, rows, fields) {  if (err) {    console.log('[query] - :'+err);    return;  }  console.log('The solution is: ', rows[0].solution);});//關閉connectionconnection.end(function(err){  if(err){    return;  }  console.log('[connection end] succeed!');});