Flask-SQLAlchemy User Management System

This code implements a user management system based on Flask-SQLAlchemy, including functions to create a user, retrieve a user by email, update a user's email, and delete a user.

Technology Stack : Flask, Flask-SQLAlchemy, SQLite database

Code Type : The type of code

Code Difficulty :

                
                    
from flask import Flask
from flask_sqlalchemy import SQLAlchemy

app = Flask(__name__)
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///example.db'
db = SQLAlchemy(app)

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

def create_user(username, email):
    new_user = User(username=username, email=email)
    db.session.add(new_user)
    db.session.commit()

def retrieve_user_by_email(email):
    return User.query.filter_by(email=email).first()

def update_user_email(user_id, new_email):
    user = User.query.get(user_id)
    if user:
        user.email = new_email
        db.session.commit()

def delete_user(user_id):
    user = User.query.get(user_id)
    if user:
        db.session.delete(user)
        db.session.commit()