Django ORM Practical Guide: CRUD Operations with SQLite Database

This article introduces the operation methods of Django framework combined with SQLite database, focusing on the use of ORM tools. Django ORM allows database operations through Python code, avoiding the need to write complex SQL statements. SQLite is lightweight and easy to use, making it suitable for development and learning. Preparatory work includes: creating a new Django project (`startproject`/`startapp`), configuring SQLite by default in `settings.py`, defining models (such as a `User` class), and executing `makemigrations` and `migrate` to generate database tables. The core is the CRUD operations of Django ORM: **Creation** can be done via `create()` or instantiation followed by `save()`; **Reading** uses `all()`, `filter()`, `get()` (supporting conditions and sorting); **Updating** uses `update()` for batch operations or querying first then modifying; **Deletion** uses `delete()` for batch operations or querying first then deleting. It is important to note the lazy execution of QuerySet, using `unique=True` to prevent duplicates, and exception handling for `get()`. Summary: By defining models, migrating table structures, and calling ORM methods, database operations can be completed. The code is concise and easy to maintain, making it suitable for quickly getting started with web development.