I am new in Node.js. Well i have experience in Backbone on Client side and Server side using PHP Laravel framework.
I want know is following connection/communication workflow is correct or possible:

Please suggest me what we can do here.
				
				Yes, Node.js is fantastic at building scalable CRUD JSON APIs to your backend database.
You can use MySQL, MongoDB, Redis or any other number of databases on the backend. You'll find support in NPMjs.org for all the popular databases.
In addition to enhanced performance of Node.js over PHP, you can also make multiple database calls in parallel with Node.js. That's something PHP can't do. In PHP you must make your database calls sequentially. In Node.js you can make several calls in parallel so long as the calls are not interdependent.