var mongoClient = require('mongodb').MongoClient;
mongoClient.connect('mongodb://localhost:27017/tut3', function (err, db) {
    if (err)throw err;

    var collection = db.collection('messages');
    var cursor = collection.find({}, {_id : true}, {limit : 50});
    cursor.count(function (err, doc) {
        console.log("---- CURSOR ----")
        console.dir(doc); // 120477

        cursor.each(function(err,doc){
            if(doc ==null){
                db.close()
            }
            console.dir(doc); //50

        });

    });


})