MVC Design Pattern Explained PDF

MVC MVC is a design pattern that separates an application into three interconnected components: Model (Data) View (UI) Controller (Logic). Separation of concerns to improve maintainability and scalability. Benefits of MVC Code organization: Promotes maintainable code, maki...

MVC MVC is a design pattern that separates an application into three interconnected components: Model (Data) View (UI) Controller (Logic). Separation of concerns to improve maintainability and scalability. Benefits of MVC Code organization: Promotes maintainable code, making it easier to locate specific components. Ease of development: Enables independent building and testing of components. Flexibility: Allows swapping views to present the same data in various formats (e.g., daily, weekly, or monthly calendar views). MVC Model: Handles data, logic, and rules. Example: Fetching user data from a database. View: Displays the user interface. Example: HTML/CSS for rendering user profiles. Controller: Manages user inputs and updates Model and View. Example: Processing a login form. MVC Workflow User sends a request via the View. The Controller processes the request. The Model retrieves or updates data. The Controller updates the View with the response. Model talks to data Which database table source to retrieve is the requested data and store data stored in? What SQL query will get me the data I need? View asks model for Would this text look data and presents better blue or red? In it in a user- the bottom corner or front and center? friendly format Should these items go in a dropdown list or radio buttons? Controller listens for the The user just clicked user to change the “hide details” data or state in button. I better tell the view. the UI, notifying the model or view accordingly The user just changed the event details. I better let the model know to update the data. Example 1 Model: Kitchen (stores and processes ingredients). View: Menu (what customers see). Controller: Waiter (takes orders and relays information). Example 2 Simple To-Do List Model: Handles tasks (add, delete, or update). View: Displays tasks to the user. Controller: Processes user actions (e.g., adding a task). Frameworks using MVC Laravel (PHP) Django (Python) Spring (Java) Ruby on Rails (Ruby)