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Async SQLAlchemy 2 with FastAPI

Introduction

This repository contains a very simple example how to use FastAPI with Async SQLAlchemy 2.0, in ORM mode. I'll probably add an example for Core mode also. No effort has been made to make this a production ready application, it's just a simple demo since at the time of writing there were few clear examples of how to do this.

Last update 29th January 2024, and tested to work with the following versions:

  • Python 3.9+
  • FastAPI 0.109.0
  • SQLAlchemy 2.0.25

Why use Raw SQLAlchemy?

I was using FastAPI{:target="_blank"} and SQLAlchemy{:target="_blank"} combined with encode/databases{:target="_blank"} for a while. This worked fine originally but I felt I needed a bit more control over the database session management.

!!! info The databases{:target="_blank"} package is a great wrapper around SQLAlchemy that allows you to use async/await for database operations. It also has a nice way of managing the database session, which is why I used it originally.

However, this did not seem be be actively maintained at the time, so I decided to give the newer Async SQLAlchemy{:target="_blank"} a try instead.

This repository is the result of my exprimentation while converting my FastAPI-template{:target="_blank"} project to use Async SQLAlchemy instead of databases.