Crud Operations Development Tutorials, Guides & Insights

You can use a tool like Postman or curl to test the endpoints.

   curl -X GET http://localhost:8000/books

from flask import Flask, render_template, request, redirect, url_for
from flask_sqlalchemy import SQLAlchemy

app = Flask(__name__)
app.config['SQLALCHEMY_DATABASE_URI'] = 'postgresql://username:password@localhost:5432/mydatabase'
app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
db = SQLAlchemy(app)

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

    def __repr__(self):
        return f'<User {self.username}>'

@app.route('/')
def index():
    users = User.query.all()
    return render_template('index.html', users=users)

@app.route('/add', methods=['POST'])
def add_user():
    username = request.form['username']
    email = request.form['email']
    new_user = User(username=username, email=email)
    db.session.add(new_user)
    db.session.commit()
    return redirect(url_for('index'))

if __name__ == '__main__':
    app.run(debug=True)

Create a directory named templates and add a file named index.html:

  curl -X PUT -H "Content-Type: application/json" -d '{"name": "Updated Item 2"}' http://127.0.0.1:5000/api/items/2

• Delete an item: