1. MongoDB

var mongo = require('mongodb');

var host = '127.0.0.1';

var port = mongo.Connecton.DEFAULT_PORT;

var server = new mongo.Server(host,port,{auto_reconnect:true});

var db = new mongo.Db('node-mongo-examples',server,{safe:true});

db.open(function(err,db){

db.collection('users',function(err,collection){

collection.insert({name:'chuck'},function(err,docs){

});

collection.find({name:'book'}).toArray(function(err,docs){

});

collection.findOne({name:'book'},function(err,docs){

});

collection.update({name:'chuck'},{$set:{name:'w'}});

collection.remove({name:'chuck'});

});

});

db.on('close',function(err,db){

console.log('close');

});