ORM

Part 2: ORM Exercises (Object Relational Mapping)

1. Implement a Library System with ORM

	•	Use an ORM tool (like Django ORM, SQLAlchemy, or Hibernate) to implement the Library Management System from the OOD exercise.
	•	Create database tables for Book, Member, Librarian, and Loan.
	•	Add functionality:
	    •	Query the database for books on loan.
	    •	Update the database when a book is returned.

2. Build a Blogging Platform

	•	Implement models for User, Post, and Comment using an ORM.
	•	Add relationships:
	    •	A Post belongs to a User.
	    •	A Comment belongs to both a Post and a User.
	•	Perform queries:
	    •	Fetch all posts by a specific user.
	    •	Retrieve comments for a particular post.

3. Develop an E-commerce Platform

	•	Create models for User, Product, Cart, and Order.
	•	Add relationships:
	    •	A User has a Cart.
	    •	A Cart contains multiple Products.
	    •	An Order is linked to a User and a Cart.
	•	Practice queries:
	    •	Fetch the cart items for a user.
	    •	Retrieve the total price of an order.

4. Build a To-Do Application

	•	Use an ORM to model a Task table.
	•	Include attributes like id, title, description, due_date, and status.
	•	Add features:
	    •	Create, read, update, and delete tasks (CRUD operations).
	    •	Query tasks by status or due date.

5. Create a Forum System

	•	Implement models for User, Thread, Post, and Category.
	•	Add relationships:
	    •	A Thread belongs to a Category.
	    •	A Post belongs to a Thread.
	    •	A Post is authored by a User.
	•	Practice with queries:
	    •	Fetch all threads in a category.
	    •	Retrieve all posts in a thread.
	    •	Get all threads started by a specific user.