How do I manage transactions in Flask-SQLAlchemy?

How do I manage transactions in Flask-SQLAlchemy?

In Flask-SQLAlchemy, you can manage transactions using the db.session object. You can start a transaction with db.session.begin(), and commit it with db.session.commit(). If something goes wrong, you can roll back with db.session.rollback().

Can you give me an example of using transactions?

Sure! Here's a simple example:

from yourapp import db

try:
    db.session.begin()
    # Your database operations here
    db.session.commit()
except Exception as e:
    db.session.rollback()
    print(f'Error: {e}')

What happens if I forget to commit?

If you forget to commit, the changes will not be saved to the database. They will be lost when the session is closed.

Is it possible to nest transactions?

Yes, you can nest transactions using savepoints. You can create a savepoint with db.session.begin_nested().