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Short tutorial on how to use Express and node-mysql
// Module dependencies
var express = require('express'),
mysql = require('mysql');
// Application initialization
var connection = mysql.createConnection({
host : 'localhost',
user : 'root',
password : 'password'
var app = module.exports = express.createServer();
// Database setup
connection.query('CREATE DATABASE IF NOT EXISTS test', function (err) {
if (err) throw err;
connection.query('USE test', function (err) {
if (err) throw err;
connection.query('CREATE TABLE IF NOT EXISTS users('
+ 'PRIMARY KEY(id),'
+ 'name VARCHAR(30)'
+ ')', function (err) {
if (err) throw err;
// Configuration
// Main route sends our HTML file
app.get('/', function(req, res) {
res.sendfile(__dirname + '/index.html');
// Update MySQL database'/users', function (req, res) {
connection.query('INSERT INTO users SET ?', req.body,
function (err, result) {
if (err) throw err;
res.send('User added to database with ID: ' + result.insertId);
// Begin listening
console.log("Express server listening on port %d in %s mode", app.address().port, app.settings.env);
<!doctype html>
<script type="text/javascript" src=""></script>
<script type="text/javascript">
$(document).ready(function () {
$('#user-submit').click(function () {
var payload = {
name: $('#user-name').val()
url: "/users",
type: "POST",
contentType: "application/json",
processData: false,
data: JSON.stringify(payload),
complete: function (data) {
<h3>Enter a username to enter into the database:</h3>
<input id="user-name" type="text" />
<input id="user-submit" type="submit" />
<p id="output"></p>
"name": "reddit-node-mysql"
, "description": "A demo of how to use Express and MySQL together"
, "author": "Clarence Leung <github@clarle>"
, "version": "0.0.1"
, "private": true
, "dependencies": {
"express": "~2.5",
"mysql": "~2.0"

nice demo code !


hi, question - if you would like to access 'connection' from another file, what would you do?


I got the below error when I tried to run this demo. Can you please help me to find out where is the problem?

D:\Nodejs>node app.js
Warning: express.createServer() is deprecated, express
applications no longer inherit from http.Server,
please use:

var express = require("express");
var app = express();

connect.multipart() will be removed in connect 3.0
visit for alternatives
connect.limit() will be removed in connect 3.0

console.log("Express server listening on port %d in %s mode", app.address().po
TypeError: Object function app(req, res, next){ app.handle(req, res, next); } ha
s no method 'address'
at Object. (D:\Nodejs\app.js:55:67)
at Module._compile (module.js:456:26)
at Object.Module._extensions..js (module.js:474:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Function.Module.runMain (module.js:497:10)
at startup (node.js:119:16)
at node.js:902:3


Hi all, I'll be updating this gist for Express 4.0 and the latest version of node-mysql shortly. Stay tuned!


Hey Clarence, I couldn't get this one to run (I think because of the various changes in middleware, etc... even though I'm using the suggested Express version). It looks very sweet and compact though, can't wait to see the updated one, thanks!

TypeError: Arguments to path.join must be strings
at path.js:360:15
at Array.filter (native)
at exports.join (path.js:358:36)
at exports.send (/home/user1/workspace/nodemaria/node_modules/express/node_modules/connect/lib/middleware/static.js:129:20)
at ServerResponse.res.sendfile (/home/user1/workspace/nodemaria/node_modules/express/lib/response.js:186:3)
at /home/user1/workspace/nodemaria/app.js:39:9
at callbacks (/home/user1/workspace/nodemaria/node_modules/express/lib/router/index.js:272:11)
at param (/home/user1/workspace/nodemaria/node_modules/express/lib/router/index.js:246:11)
at pass (/home/user1/workspace/nodemaria/node_modules/express/lib/router/index.js:253:5)
at Router._dispatch (/home/user1/workspace/nodemaria/node_modules/express/lib/router/index.js:280:5)


Nice easy to follow demo


Thanks for this :+1: And ohadpartuck if you wanted to move connection into a separate file you could just place it in, say, connection.js and in that file module.exports = connection then connection = require('./connection.js') in your main app.js file.


Its not working for me, So I just change

res.sendfile( '/index.html' , {root:__dirname}); //instead of res.sendfile( __dirname + '/index.html' );

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