Node http和express和mysql

const http = require("http");
const express = require("express");
const mysql = require("mysql");

var pool = mysql.createPool({
host:'127.0.0.1',
user:'root',
password:'',
database:'jd',
connectionLimit:5
});

var app = express();
var server = http.createServer(app);
server.listen(80);
app.get("/",(req,res)=>{
res.sendFile(__dirname+"/public/users.html");
});
app.get("/jquery",(req,res)=>{
res.sendFile(__dirname+"/public/jquery-1.11.3.js");
});
app.get("/list.do",(req,res)=>{
pool.getConnection((err,conn)=>{
conn.query("select * from jd_user",(err,result)=>{
res.json(result);
});
});
});
app.get("/add",(req,res)=>{
res.sendFile(__dirname+"/public/user_add.html");
});
app.get("/add.do",(req,res)=>{
var u = req.query.uname;
var p = req.query.upwd;
pool.getConnection((err,conn)=>{
conn.query("insert into jd_user values(null,?,?)",[u,p],(err,result)=>{
res.json(result);
});
});
});