How does Django’s ORM work and what are QuerySets?

I-Hub Talent: The Best Full Stack Python Institute in Hyderabad

If you're looking for the best Full Stack Python institute in Hyderabad, I-Hub Talent is your ultimate destination. Known for its industry-focused curriculum, expert trainers, and hands-on projects, I-Hub Talent provides top-notch Full Stack Python training to help students and professionals master Python, Django, Flask, Frontend, Backend, and Database Technologies.

At I-Hub Talent, you will gain practical experience in HTML, CSS, JavaScript, React, SQL, NoSQL, REST APIs, and Cloud Deployment, making you job-ready. The institute offers real-time projects, career mentorship, and placement assistance, ensuring a smooth transition into the IT industry.

Join I-Hub Talent’s Full Stack Python course in Hyderabad and boost your career with the latest Python technologies, web development, and software engineering skills. Elevate your potential and land your dream job with expert guidance and hands-on training!

Django’s ORM (Object-Relational Mapping) is a powerful abstraction layer that allows developers to interact with databases using Python code instead of writing raw SQL queries. It translates Python classes and methods into database tables and queries, enabling seamless database operations.

How Django’s ORM Works:

  • Models as Python Classes:
    Each database table is represented by a Django model class. Model attributes map to database fields (columns).

  • Automatic SQL Generation:
    When you perform operations on models (create, read, update, delete), Django ORM converts these into optimized SQL queries behind the scenes.

  • Database Abstraction:
    ORM supports multiple databases (PostgreSQL, MySQL, SQLite, etc.) with the same Python code, making your app portable.

What are QuerySets?

  • A QuerySet is a collection of database queries constructed using Django’s ORM syntax.

  • It represents zero or more objects from the database and is lazy-evaluated — no database action happens until the QuerySet is actually iterated or explicitly evaluated.

  • QuerySets support filtering (filter()), ordering (order_by()), slicing, and chaining methods to refine queries.

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