How can I use FastAPI with Async SQLAlchemy?

How can I use FastAPI with Async SQLAlchemy?

You can use FastAPI with Async SQLAlchemy by integrating the async capabilities of SQLAlchemy with FastAPI's async routes. First, ensure you have the necessary packages installed: fastapi, asyncpg, and sqlalchemy.

What are the benefits of using Async SQLAlchemy with FastAPI?

Using Async SQLAlchemy with FastAPI allows for non-blocking database operations, which can improve performance and scalability, especially under high load.

Can you provide a simple code example?

Sure! Here's a basic example:

from fastapi import FastAPI
from sqlalchemy.ext.asyncio import AsyncSession, create_async_engine
from sqlalchemy.orm import sessionmaker

app = FastAPI()

DATABASE_URL = "postgresql+asyncpg://user:password@localhost/dbname"
engine = create_async_engine(DATABASE_URL, echo=True)
AsyncSessionLocal = sessionmaker(bind=engine, class_=AsyncSession, expire_on_commit=False)

@app.get("/items/")
async def read_items():
    async with AsyncSessionLocal() as session:
        result = await session.execute(select(Item))
        return result.scalars().all()

This sets up a basic FastAPI app with an async database session.

What should I do if I encounter issues with database connections?

If you encounter issues with database connections, check your database URL, ensure the database server is running, and verify that your async driver is correctly installed.