MVC Introduction

The Model-View-Controller (MVC) framework is an architectural pattern that separates an application into three main logical components Model, View, and Controller. Hence the abbreviation MVC. Each architecture component is built to handle specific development aspect of an application. MVC separates the business logic and presentation layer from each other. It was traditionally used for desktop graphical user interfaces (GUIs). Nowadays, MVC architecture has become popular for designing web applications as well as mobile apps.

Three important MVC the components are:

  • Model: It includes all the data and its related logic
  • View: Present data to the user or handles user interaction
  • Controller: An interface between Model and View components

Model

The model component stores data and its related logic. It represents data that is being transferred between controller components or any other related business logic. For example, a Controller object will retrieve the customer info from the database. It manipulates data and send back to the database or use it to render the same data.

It responds to the request from the views and also responds to instructions from the controller to update itself. It is also the lowest level of the pattern which is responsible for maintaining data.

View

A View is that part of the application that represents the presentation of data.

Views are created by the data collected from the model data. A view requests the model to give information so that it resents the output presentation to the user.

The view also represents the data from chats, diagrams, and table. For example, any customer view will include all the UI components like text boxes, drop downs, etc.

Controller

The Controller is that part of the application that handles the user interaction. The controller interprets the mouse and keyboard inputs from the user, informing model and the view to change as appropriate.

A Controller send’s commands to the model to update its state(E.g., Saving a specific document). The controller also sends commands to its associated view to change the view’s presentation (For example scrolling a particular document).

Advantages of MVC

– MVC architecture will separate the user interface from business logic and business logic
– Components are reusable.
– Easy o maintain.
– Different components of the application in MVC can be independently deployed and maintained.
– This architecture helpt to test components independently.

Disadvantages of MVC

-The complexity is high.
-Not suitable for small applications.
-The inefficiency of data access in view.

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