mongodb_sample.js

// http://mongodb.github.io/node-mongodb-native/2.0/getting-started/quick-tour/

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

// Connection URL
var url = 'mongodb://localhost:27017/myproject';

var insertDocuments = function(db, callback) {
  // Get the documents collection
  var collection = db.collection('documents');
  // Insert some documents
  collection.insertMany([
    {a : 1}, {a : 2}, {a : 3}
  ], function(err, result) {
    assert.equal(err, null);
    assert.equal(3, result.result.n);
    assert.equal(3, result.ops.length);
    console.log("Inserted 3 documents into the collection");
    callback(result);
  });
}

var findDocuments = function(query, db, callback) {
  // Get the documents collection
  var collection = db.collection('documents');
  // Find some documents
  collection.find(query).toArray(function(err, docs) {
    assert.equal(err, null);
    console.log("Found the following records");
    console.log(docs)
    callback(docs);
  });
}

var updateDocument = function(db, callback) {
  // Get the documents collection
  var collection = db.collection('documents');
  // Update document where a is 2, set b equal to 1
  collection.updateOne({ a : 2 }
    , { $set: { b : 1 } }, function(err, result) {
    assert.equal(err, null);
    assert.equal(1, result.result.n);
    console.log("Updated the document with the field a equal to 2");
    callback(result);
  });  
}

var removeDocument = function(db, callback) {
  // Get the documents collection
  var collection = db.collection('documents');
  // Insert some documents
  collection.deleteOne({ a : 3 }, function(err, result) {
    assert.equal(err, null);
    assert.equal(1, result.result.n);
    console.log("Removed the document with the field a equal to 3");
    callback(result);
  });    
}

var indexCollection = function(db, callback) {
  db.collection('documents').createIndex(
    { "a": 1 },
      null,
      function(err, results) {
        console.log(results);
        callback();
    }
  );
};

// Use connect method to connect to the server
MongoClient.connect(url, function(err, db) {
  assert.equal(null, err);
  console.log("Connected succesfully to server");

  var indexCallback = function () {
    db.close();
  };

  var removeCallback = function () {
  	indexCollection(db, indexCallback);
  };

  var updateCallback = function () {
    removeDocument(db, removeCallback);
  };

  var find3Callback = function () {
		updateDocument(db, updateCallback);
  };

	var findAllCallback = function () {
    findDocuments({a : 3}, db, find3Callback);
  };

	var insertCallback = function () {
    findDocuments({}, db, findAllCallback);
	};

  insertDocuments(db, insertCallback);
});