app.py

from flask import Flask, render_template, request, redirect
from flask_sqlalchemy import SQLAlchemy
from datetime import date

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)
    datec = db.Column(db.DateTime, default = date.today())

@app.route('/searchbar', methods = ['GET', 'POST'])
def search():
    bar = ''
    if request.method == 'POST' and 'bar' in request.form:
        bar = request.form['bar']
    alltodo = Todo.query.filter_by(title=bar).all()
    return render_template('index.html', alltodos=alltodo)

@app.route('/', methods = ['GET', 'POST'])
def hw():
    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()
    # print(alltodo)
    return render_template('index.html', alltodos=alltodo)

@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('/')

@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)

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