Express - DB Connection

How to use DB with Express

• Express apps can use any database mechanism supported by Node
  -In order to use these you have to first install the database driver using NPM

Hello DB

//this works with older versions of  mongodb version ~ 2.2.33
const MongoClient = require('mongodb').MongoClient;

MongoClient.connect('mongodb://localhost:27017/animals', function(err, db) {
  if (err) throw err;

  db.collection('mammals').find().toArray(function (err, result) {
    if (err) throw err;

    console.log(result);
  });
});

//for mongodb version 3.0 and up
const MongoClient = require('mongodb').MongoClient;
MongoClient.connect('mongodb://localhost:27017/animals', function(err, client){
   if(err) throw err;

   let db = client.db('animals');
   db.collection('mammals').find().toArray(function(err, result){
     if(err) throw err;
     console.log(result);
     client.close();
   });
});