Mongodb not working with Nodejs - node.js

Question

I'm trying to print name and job of people after taking input from via a html form on the browser. The program also allows deletion and update of record through simple links on the same page. The program is, however, not working.
I even tried creating a "newapp" database (created in the server file) and filled it with some dummy values, the program still wont work!
Following is my node.js file
var express= require("express"),
http= require("http"),
bodyparser= require('body-parser'),
mongo= require("mongodb");
var app= express(),
db= new mongo.Db("newapp",
new mongo.Server("localhost", 27017),
{safe:true}, {auto_reconnect: true}),
people= db.collection("people");
app.use(bodyparser.urlencoded({extended: true}));
app.get("/", function(req, res){
people.find().toArray(function(err, docs){
if(err)
throw err;
res.render("index.jade", {people: docs});
});
});
app.post("/", function(req, res){
people.insert({name: req.body.name, job: req.body.job},
function(err, doc){
if(err)
throw err;
res.redirect("/");
});
});
app.listen(3000);
My index.jade file is:
form(method="POST")
p Name:
input(type="text", name="name")
p Job:
input(type="text", name="job")
p: button Add
if(typeof(people)!=="undefined")
ul
each person in people
li
h2= person.name+ " ("+ person.job+ ")"
p
a(href="/update/#{person._id}") Update
a(href="/delete/#{person._id}") Delete
else
p No People
Any help is much appreciated. Thanks a lot!

Answer 1

The error was that I had not done db.open(...) anywhere in the program
Correct working code is:
var express= require("express"),
http= require("http"),
bodyparser= require("body-parser"),
mongo= require("mongodb");
var app= express(),
db= new mongo.Db("newapp", new mongo.Server("localhost", "27017"),
{safe:true}, {auto_reconnect: true});
app.use(bodyparser.urlencoded({extended: true}));
db.open(function(err, db){
if(err)
console.log(err);
people= db.collection("people");
app.get("/", function(req, res){
var cursor= people.find();
cursor.toArray(function(err, docs){
if(err)
throw err;
res.render("index.jade", {people: docs});
});
});
app.post("/", function(req, res){
people.insert({name: req.body.name, job: req.body.job},
function(err, doc){
if(err)
throw err;
res.redirect("/");
});
});
app.get("/update/:id", function(req, res){
people.findOne({_id: new mongo.ObjectID(req.params.id)},
function(err, doc){
if(err)
throw err;
res.render("update.jade", {person: doc});
});
});
app.post("/update/:id", function(req, res){
people.update({_id: new mongo.ObjectID(req.params.id)},{
name: req.body.name,
job: req.body.job
}, function(err, item){
if(err)
throw err;
res.redirect("/");
});
});
app.get("/delete/:id", function(req, res){
people.remove({_id: new mongo.ObjectID(req.params.id)},
function(err){
if(err)
throw err;
res.redirect("/");
});
});
});
app.listen(3000, function(){
console.log("Now Listening on port: 3000");
});
The index.jade (in views folder) is:
form(method="POST")
p Name:
input(type="text", name="name")
p Job:
input(type="text", name="job")
p: button Add
if(people!==NULL)
ul
each person in people
li
h2= person.name+ " ("+ person.job+ ")"
p
a(href="/update/#{person._id}") Update&nbsp
a(href="/delete/#{person._id}") Delete
else
p No People
The update.js (in views folder) is:
form(method="POST")
p Name:
input(type="text", name="name", value="#{person.name}")
p Job:
input(type="text", name="job", value="#{person.job}")
p: button Update

Answer 2

please check this hope this will work..
var express= require("express"),
http= require("http"),
bodyparser= require('body-parser'),
var MongoClient = require('mongodb').MongoClient;
var connect = require('connect'),
var app= express(),
MongoClient.connect("mongodb://localhost:27017/newapp", function(err, db) {
if(err) { return console.dir(err); }
var people = db.collection('people');
app.use(bodyparser.urlencoded({extended: true}));
app.get("/", function(req, res){
people.find().toArray(function(err, docs){
if(err)
throw err;
res.render("index.jade", {people: docs});
});
});
app.post("/", function(req, res){
people.insert({name: req.body.name, job: req.body.job},
function(err, doc){
if(err)
throw err;
res.redirect("/");
});
});
});
app.listen(3000);