Connect MongoDB with nodeJS

In following example will explain the how to make connection nodeJS with mongodb.

• create directory connectdb
• first create package.json file inside the connectdb directory and add following content. then cd to connectdb directory and install dependancy by using npm install command

	{
	"name": "cars",
	"description": "cars application",
	"version": "0.0.1",
	"private": true,
	"dependencies": {
	"express": "3.x",
	"mongodb": "1.1.8"
	},
	"engines": {
	"node": "0.8.4",
	"npm": "1.1.49"
	}
	}

view raw package.json hosted with ❤ by GitHub
• In this file contains dependency modules. 
• cd to connectdb directory and enter following command then dependency modules will be installed 

       npm install 

• Then create server.js/ app.js file.To run nodejs application run this server.js file. This is the entry point for the application.

	var express = require('express'),
	path = require('path'),
	http = require('http'),
	car = require('./routes/cars');
	var app = express();
	app.configure(function () {
	app.set('port', process.env.PORT || 3000);
	app.use(express.logger('dev')); /* 'default', 'short', 'tiny', 'dev' */
	app.use(express.bodyParser()),
	app.use(express.static(path.join(__dirname, 'public')));
	});
	app.get('/cars', car.findAll);
	app.get('/cars/:id', car.findById);
	app.delete('/cars/:id', car.deleteCar);
	http.createServer(app).listen(app.get('port'), function () {
	console.log("Express server listening on port " + app.get('port'));
	});

view raw server.js hosted with ❤ by GitHub

Create car module
Create routes/cars.js file. This contains car related code.
 

	var mongo = require('mongodb');
	var Server = mongo.Server,
	Db = mongo.Db,
	BSON = mongo.BSONPure;
	console.log("top");
	var server = new Server('localhost', 27017, {auto_reconnect: true});
	db = new Db('cardb', server, {safe: true});
	db.open(function(err, db) {
	if(!err) {
	console.log("Connected to 'cardb' database");
	db.collection('cars', {safe:true}, function(err, collection) {
	if (err) {
	console.log("The 'cars' collection doesn't exist. Creating it with sample data...");
	populateDB();
	}
	});
	}
	});
	exports.findById = function(req, res) {
	var id = req.params.id;
	console.log('Retrieving car: ' + id);
	db.collection('cars', function(err, collection) {
	collection.findOne({'_id':new BSON.ObjectID(id)}, function(err, item) {
	res.send(item);
	});
	});
	};
	exports.findAll = function(req, res) {
	db.collection('cars', function(err, collection) {
	collection.find().toArray(function(err, items) {
	res.send(items);
	});
	});
	};
	exports.deleteCar = function(req, res) {
	var id = req.params.id;
	console.log('Deleting car: ' + id);
	db.collection('cars', function(err, collection) {
	collection.remove({'_id':new BSON.ObjectID(id)}, {safe:true}, function(err, result) {
	if (err) {
	res.send({'error':'An error has occurred - ' + err});
	} else {
	console.log('' + result + ' document(s) deleted');
	res.send(req.body);
	}
	});
	});
	}
	/*--------------------------------------------------------------------------------------------------------------------*/
	// Populate database with sample data -- Only used once: the first time the application is started.
	// You'd typically not find this code in a real-life app, since the database would already exist.
	var populateDB = function() {
	var cars = [
	{
	name: "vitz",
	year: "2009",
	brand: "toyota",
	country: "Japan",
	region: "asia",
	description: "toyota Vitz car",
	picture: "saint_cosme.jpg"
	},
	{
	name: "priuse",
	year: "2009",
	brand: "toyota",
	country: "Japan",
	region: "asia",
	description: "toyota Priuse car",
	picture: "viticcio.jpg"
	},
	{
	name: "city",
	year: "2009",
	brand: "honda",
	country: "Japan",
	region: "asia",
	description: "honda city car",
	picture: "ex_umbris.jpg"
	}];
	db.collection('cars', function(err, collection) {
	collection.insert(cars, {safe:true}, function(err, result) {});
	});
	};

view raw car.js hosted with ❤ by GitHub

You can get code from following link
 https://github.com/cchathura/cmeanstack.git/branches/connectdb