sqlargon 0.3.2

SQLAlchemy utils for Postgres and Sqlite

SQLArgon

Wrapper around SQLAlchemy async session, core and Postgres native features

---

Version: 0.3.2

Documentation: https://performancemedia.github.io/sqlargon/

Repository: https://github.com/performancemedia/sqlargon

---

About

This library provides glue code to use sqlalchemy async sessions, core queries and orm models from one object which provides somewhat of repository pattern. This solution has few advantages:

• no need to pass session object to every function/method. It is stored (and optionally injected) in repository object
• write data access queries in one place
• no need to import insert,update, delete, select from sqlalchemy over and over again
• Implicit cast of results to .scalars().all() or .one()
• Your view model (e.g. FastAPI routes) does not need to know about the underlying storage. Repository class can be replaced at any moment any object providing similar interface.

Usage

import sqlalchemy as sa
from sqlalchemy.orm import Mapped
from sqlargon import GUID, GenerateUUID, Database, Base, SQLAlchemyRepository

db = Database(url=...)

class User(Base):
        id = sa.Column(
            GUID(), primary_key=True, server_default=GenerateUUID(), nullable=False
        )
        name: Mapped[str] = sa.Column(sa.Unicode(255))


class UserRepository(SQLAlchemyRepository[User]):

    async def get_user_by_name(self, name: str):
        # custom user function
        return await self.select().filter_by(name=name).one()

user_repository = UserRepository(db)

# select
await user_repository.all()
await user_repository.list(User.name == "test", User.id >= 18)


# insert
user = await user_repository.insert({"name": "test"}).one()

await user_repository.commit()



# delete
await user_repository.delete().filter(name="John").one()

# custom sqlalchemy core functions

users = await user_repository.select().join(...).filter(
    User.name == "test"
).filter_by(...).order_by(User.created_at).limit(2).all()

Sessions

Manager object needs sqlalchemy.ext.asyncio.AsyncSession, but it's possible to provide the session object by yourself, by subclassing Manager class e.g.

from sqlargon import Database, SQLAlchemyRepository
from fastapi import Depends

db = Database(url="sqlite+aiosqlite:///:memory:")


class UserRepository(SQLAlchemyRepository[User]):
    ...



    
from fastapi import FastAPI

app = FastAPI()


@app.get("/users")
async def get_users(user_repository: UserRepository = db.Depends(UserRepository)):
    return await user_repository.all()