Can I just use SQLAlchemy directly?

Absolutely. SQLModel is literally just a wrapper around SQLAlchemy and Pydantic. If you have an existing SQLAlchemy codebase, it works perfectly with FastAPI. SQLModel is simply recommended for greenfield projects to reduce boilerplate.

What happens if an error occurs before I commit?

If your Python code throws an exception, the dependency's `with Session:` context manager will exit, the session will be closed, and the database transaction will automatically rollback. No half-written data will be saved.

How do I filter results?

Instead of `select(User)`, you use the `where()` method: `select(User).where(User.username == "Alice")`. The session will execute this as a `SELECT * FROM user WHERE username = 'Alice'` query.

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ORM Integration (SQLModel)

Master database integration in FastAPI using SQLModel. Learn how to define unified data models, safely inject database sessions, and execute CRUD (Create, Read, Update, Delete) operations using object-oriented queries.

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