node和数据库建立连接

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var express = require('express')   , app = express(); var querystring = require('querystring'); var util = require('util'); var mysql  = require('mysql');  var connection = mysql.createConnection({       host     : 'localhost',         user     : 'root',                password : '123456',         // port: '3306',                     database: 'test',  //数据库名称 });    connection.connect();