Added MongoDB demo.

Author: sayar

13_MongoDB/app.js

@@ -0,0 +1,77 @@
+// import the language driver
+var MongoClient = require('mongodb').MongoClient
+	, assert = require('assert');
+var ObjectID = require('mongodb').ObjectID;
+
+// Connection URL for local mongodb server
+var url = 'mongodb://127.0.0.1:27017/test';
+
+// Use connect method to connect to the Server
+MongoClient.connect(url, function (err, db) {
+	//ensure we've connected
+	assert.equal(null, err);
+
+	var bankData = db.collection('bank_data');
+
+	bankData.insertOne({
+		first_name: "Rami",
+		last_name: "Sayar",
+		accounts: [
+			{
+				account_balance: "50000000",
+				account_type: "Investment",
+				currency: "USD"
+			}]
+	}, function (err, op_result) {
+
+		if (err) {
+			return console.error(err);
+		}
+
+		console.log('inserted:');
+		console.log(op_result.ops[0]);
+
+		var updatedPerson = op_result.ops[0];
+		updatedPerson.accounts[0].account_balance += 100000;
+
+		bankData.updateOne({ _id: updatedPerson._id }, updatedPerson, { w: 1 }, function (err, op_result) {
+
+			if (err) {
+				return console.error(err);
+			}
+
+			console.log('sucessfully updated ' + op_result.result.n + ' person document');
+
+			//retrieve the inserted collection from mongodb
+			//should be the exact same object we just updated
+			bankData.findOne({ _id: updatedPerson._id }, function (err, doc) {
+
+				if (err) {
+					return console.error(err);
+				}
+
+				console.log('retrieved person: ' + doc.first_name + ' ' + doc.last_name);
+				console.log('accounts: ');
+				for (var i in doc.accounts) {
+					console.log('Type: ' + doc.accounts[i].account_type);
+					console.log('Balance: ' + doc.accounts[i].account_balance);
+				}
+
+				//now delete the document we just inserted
+
+				bankData.remove({ _id: updatedPerson._id }, function (err, count) {
+
+					if (err) {
+						db.close();
+						return console.error(err);
+					}
+					console.log('sucessfully deleted documents');
+
+					return db.close();
+				});
+			});
+		});
+		return;
+	});
+	return console.log("Connected correctly to server");
+});

13_MongoDB/package.json

@@ -0,0 +1,7 @@
+{
+  "name": "13_MongoDB",
+  "version": "0.0.0",
+  "dependencies": {
+    "mongodb": "^2.0.39"
+  }
+}