aiohttp-sqlalchemy 0.13.2

SQLAlchemy 1.4 / 2.0 support for aiohttp.

SQLAlchemy 1.4 / 2.0 support for aiohttp.

The library provides the next features:

• initializing asynchronous sessions through a middlewares;

• initializing asynchronous sessions through a decorators;

• simple access to one asynchronous session by default key;

• preventing attributes from being expired after commit by default;

• support for different types of request handlers.

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_session
from datetime import datetime
import sqlalchemy as sa
from sqlalchemy import orm


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


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


async def main(request):
    db_session = sa_session(request)

    async with db_session.bind.begin() as connection:
        await connection.run_sync(Base.metadata.create_all)

    async with db_session.begin():
        db_session.add_all([MyModel()])
        result = await db_session.execute(sa.select(MyModel))
        items = result.scalars().all()

    data = {}
    for item in items:
        data[item.pk] = item.timestamp.isoformat()

    return web.json_response(data)


app = web.Application()
binding = sa_bind('sqlite+aiosqlite:///')
aiohttp_sqlalchemy.setup(app, [binding])
app.add_routes([web.get('/', main)])

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