Mongodb not returning promise (using package version 2.1.18 )

[Maisnam Raju]

I am trying to use promises to return the database connection in nodejs but the promise is returned in an asynchronous manner. 

"use strict";

var MongoClient = require('mongodb').MongoClient;

var Joi  = require('joi');

var co   = require('co');

var url  = 'mongodb://localhost:27017/blue_water';

var CrewModel = require('./crew');

var DB;

MongoClient.connect(url).then(function(db) {

    console.log(db);

});

console.log(2);

The console.log() is returned before the promise function is executed. Am I missing something here ?