Flask-SQLAlchemy-compat-backend-py37

Flask SQLAlchemy backend supporting the Python 3.7 version of Flask SQLAlchemy compat.

This package is forked from an unofficial version of Flask SQLAlchemy. The motication of uploading this fork to PyPI includes:

1. Bring the DeclarativeBase feature to Python 3.7. The official version is up to 3.0.5 which is not compatible with the sqlalchemy2 style.

2. Serve as a backend support of the package flask-sqlalchemy-compat when using Python 3.7

If you are using Pyhon<3.7, you should not use flask-sqlalchemy-compat, the only available choice is flask-sqlalchemy.

If you are using Python>=3.8, you do not need this package, because flask-sqlalchemy is already compatible with Python>=3.8.

Flask-SQLAlchemy

> The following part is from the original README file.

Flask-SQLAlchemy is an extension for Flask that adds support for SQLAlchemy to your application. It aims to simplify using SQLAlchemy with Flask by providing useful defaults and extra helpers that make it easier to accomplish common tasks.

Installing

Install and update using pip:

$ pip install -U Flask-SQLAlchemy

A Simple Example

from flask import Flask
from flask_sqlalchemy import SQLAlchemy
from sqlalchemy.orm import DeclarativeBase, Mapped, mapped_column

app = Flask(__name__)
app.config["SQLALCHEMY_DATABASE_URI"] = "sqlite:///example.sqlite"

class Base(DeclarativeBase):
  pass

db = SQLAlchemy(app, model_class=Base)

class User(db.Model):
    id: Mapped[int] = mapped_column(db.Integer, primary_key=True)
    username: Mapped[str] = mapped_column(db.String, unique=True, nullable=False)

with app.app_context():
    db.create_all()

    db.session.add(User(username="example"))
    db.session.commit()

    users = db.session.execute(db.select(User)).scalars()

Contributing

For guidance on setting up a development environment and how to make a contribution to Flask-SQLAlchemy, see the contributing guidelines.

Donate

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