aiohttp-sqlalchemy 0.8.0

SQLAlchemy 1.4 / 2.0 support for aiohttp.

SQLAlchemy 1.4 / 2.0 support for aiohttp.

Library forward a sqlalchemy.ext.asyncio.AsyncSession object as request['sa_main'] or SAView.sa_session() by default.

Documentation

https://aiohttp-sqlalchemy.readthedocs.io/

Installation

pip install aiohttp-sqlalchemy

Simple example

Install aiosqlite for work with sqlite3:

pip install aiosqlite

Copy and paste this code in a file and run:

from aiohttp import web
import aiohttp_sqlalchemy
from aiohttp_sqlalchemy import sa_bind, sa_middleware
from datetime import datetime
import sqlalchemy as sa
from sqlalchemy import orm
from sqlalchemy.ext.asyncio import AsyncSession, create_async_engine


metadata = sa.MetaData()
Base = orm.declarative_base(metadata=metadata)


class MyModel(Base):
    __tablename__ = 'my_table'
    id = sa.Column(sa.Integer, primary_key=True)
    timestamp = sa.Column(sa.DateTime(), default=datetime.now)


async def main(request):
    async with request['sa_main'].bind.begin() as conn:
        await conn.run_sync(Base.metadata.create_all)

    async with request['sa_main'].begin():
        request['sa_main'].add_all([MyModel()])
        result = await request['sa_main'].execute(sa.select(MyModel))
        data = {r.id: r.timestamp.isoformat() for r in result.scalars()}
        return web.json_response(data)


app = web.Application()

engine = create_async_engine('sqlite+aiosqlite:///')
Session = orm.sessionmaker(engine, AsyncSession)
aiohttp_sqlalchemy.setup(app, [sa_bind(Session)])

app.add_routes([web.get('/', main)])
web.run_app(app)