Flask-SQLAlchemy

Code

from flask import Flask
from flask_sqlalchemy import SQLAlchemy

app = Flask(__name__)
app.config["SQLALCHEMY_DATABASE_URI"] = "sqlite:///app.db"
app.config["SQLALCHEMY_TRACK_MODIFICATIONS"] = False
db = SQLAlchemy(app)

class User(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    name = db.Column(db.String(80), nullable=False)
    email = db.Column(db.String(120), unique=True)

with app.app_context():
    db.create_all()
    db.session.add(User(name="Alice", email="[email protected]"))
    db.session.commit()

    users = User.query.filter_by(name="Alice").all()
    print(users[0].email)

Explanation

Flask-SQLAlchemy wraps SQLAlchemy and exposes a db object for models and sessions. Models inherit db.Model and define columns with db.Column; db.session tracks changes until commit. The Model.query attribute provides a query interface for filters and retrieval.

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