app.py

from flask import Flask, render_template,request,redirect

from flask_sqlalchemy import SQLAlchemy
from datetime import datetime

app = Flask(__name__)

app.config['SQLALCHEMY_DATABASE_URI']='sqlite:///todo.db'
app.config['SQLALCHEMY_TRACK_MODIFICATIONS']=False
db=SQLAlchemy(app)



class Todo(db.Model):
    sno=db.Column(db.Integer,primary_key=True)
    title=db.Column(db.String(200),nullable=False)
    desc=db.Column(db.String(500),nullable=False)
    date_created=db.Column(db.DateTime,default=datetime.utcnow)

    def __repr__(self) -> str:
        return f"{self.sno} - {self.title}"



@app.route('/',methods=['GET','POST'])
def hello_world():
    if request.method=='POST':
        title=request.form['title']
        desc=request.form['desc']
        todo=Todo(title=title,desc=desc)
        db.session.add(todo)
        db.session.commit()
    allTodo=Todo.query.all()
    return render_template('index.html',allTodo=allTodo)

    

@app.route('/show')
def products():
    allTodo=Todo.query.all()
    print(allTodo)
    return 'this is products page'

@app.route('/update/<int:sno>',methods=['GET','POST'])
def update(sno):
    if request.method=='POST':
        title=request.form['title']
        desc=request.form['desc']
        todo=Todo.query.filter_by(sno=sno).first()
        todo.title=title
        todo.desc=desc
        db.session.add(todo)
        db.session.commit()
        return redirect("/")

    todo=Todo.query.filter_by(sno=sno).first()
    return render_template('update.html',todo=todo)
   

@app.route('/delete/<int:sno>')
def delete(sno):
    todo=Todo.query.filter_by(sno=sno).first()
    db.session.delete(todo)
    db.session.commit()
    return redirect("/")

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