SQLAlchemy 1.4 / 2.0 support for aiohttp.
Project description
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
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_init_db, 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.begin():
db_session.add_all([MyModel()])
stmt = sa.select(MyModel)
result = await db_session.execute(stmt)
items = result.scalars().all()
data = {}
for item in items:
data[item.pk] = item.timestamp.isoformat()
return web.json_response(data)
async def app_factory():
app = web.Application()
sa_binding = sa_bind('sqlite+aiosqlite:///')
aiohttp_sqlalchemy.setup(app, [sa_binding])
await sa_init_db(app, metadata)
app.add_routes([web.get('/', main)])
return app
if __name__ == '__main__':
web.run_app(app_factory())
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