aiohttp-sqlalchemy 0.9.3

SQLAlchemy 1.4 / 2.0 support for aiohttp.

SQLAlchemy 1.4 / 2.0 support for aiohttp.

The library provides the next features:

• forwarding SQLAlchemy asynchronous sessions for function handlers, class organized handlers, and class based view methods;

• a middleware factory sa_middleware(key: str = 'sa_main')' for forwarding sessions as request[key] for all your request handlers;

• a decorator sa_decorator(key: str = 'sa_main') for forwarding sessions as request[key] for your chosen handlers;

• a parent class SAView for forwarding sessions as SAView.sa_session(key: str = 'sa_main') method.

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
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)])

if __name__ == '__main__':
    web.run_app(app)