express+mysql+vue專案入門-express服務端連線mysql資料庫，此方法mysql為例：新增一個mysql連線模組並匯出，在服務端入口匯入使用即可

var mysql = require('mysql');

var connection = mysql.createConnection({
  host     : 'localhost',
  user     : 'root',
  password : 'root',
  port:3306,
  database:'mytest'
});
 
connection.connect(function(err) {
  if (err) {
  	console.log('mysql connection is exit error...')
    return false;
  }
  console.log('mysql connection already...')
});



module.exports = connection