Add SQLAlchemy support to your Flask application.

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  • License: BSD License
  • Maintainer: Pallets
  • Requires: Python >=3.8
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Project description

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.

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