Flask CRUD Application Delete Data From MySQL Database

Flask CRUD

About Lesson

In this Flask CRUD Application lesson we are going to learn about Flask CRUD Application Delete Data From MySQL Database, we have already learned the retrieve, insert and update functionalities in our Flask CRUD Application, and the last functionality is the delete functionality that we want to learn.

Open your App.py file and add a method for deleting the data in your Flask CRUD Application.

@app.route('/delete/<id>/', methods=['GET', 'POST'])
def delete(id):
    my_data = Data.query.get(id)
    db.session.delete(my_data)
    db.session.commit()
    flash("Employee Deleted Successfully")

    return redirect(url_for('Index'))

@app.route('/delete/<id>/', methods=['GET', 'POST'])

def delete(id):

my_data = Data.query.get(id)

db.session.delete(my_data)

db.session.commit()

flash("Employee Deleted Successfully")

return redirect(url_for('Index'))

This is our complete code for App.py file.

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




#create the object of Flask
app  = Flask(__name__)
app.secret_key = "geekscoderssecretkey"
#SqlAlchemy Database Configuration With Mysql
app.config['SQLALCHEMY_DATABASE_URI'] = 'mysql://root:''@localhost/crud'
app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False


db = SQLAlchemy(app)


# Creating model table for our CRUD database
class Data(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    name = db.Column(db.String(100))
    email = db.Column(db.String(100))
    phone = db.Column(db.String(100))

    def __init__(self, name, email, phone):
        self.name = name
        self.email = email
        self.phone = phone


#creating our routes
@app.route('/')
def Index():
    all_data = Data.query.all()
    return render_template("index.html", employees=all_data)


# this route is for inserting data
# to mysql database via html forms
@app.route('/insert', methods=['POST'])
def insert():
    if request.method == 'POST':
        name = request.form['name']
        email = request.form['email']
        phone = request.form['phone']

        my_data = Data(name, email, phone)
        db.session.add(my_data)
        db.session.commit()

        flash("Employee Inserted Successfully")

        return redirect(url_for('Index'))


# this is our update route where we are going to
# update our employee
@app.route('/update', methods=['GET', 'POST'])
def update():
    if request.method == 'POST':
        my_data = Data.query.get(request.form.get('id'))

        my_data.name = request.form['name']
        my_data.email = request.form['email']
        my_data.phone = request.form['phone']

        db.session.commit()
        flash("Employee Updated Successfully")

        return redirect(url_for('Index'))


# This route is for deleting our employee
@app.route('/delete/<id>/', methods=['GET', 'POST'])
def delete(id):
    my_data = Data.query.get(id)
    db.session.delete(my_data)
    db.session.commit()
    flash("Employee Deleted Successfully")

    return redirect(url_for('Index'))

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

from flask import Flask, render_template, redirect, flash, \

request, url_for

from flask_sqlalchemy import SQLAlchemy

#create the object of Flask

app = Flask(__name__)

app.secret_key = "geekscoderssecretkey"

#SqlAlchemy Database Configuration With Mysql

app.config['SQLALCHEMY_DATABASE_URI'] = 'mysql://root:''@localhost/crud'

app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False

db = SQLAlchemy(app)

# Creating model table for our CRUD database

class Data(db.Model):

id = db.Column(db.Integer, primary_key=True)

name = db.Column(db.String(100))

email = db.Column(db.String(100))

phone = db.Column(db.String(100))

def __init__(self, name, email, phone):

self.name = name

self.email = email

self.phone = phone

#creating our routes

@app.route('/')

def Index():

all_data = Data.query.all()

return render_template("index.html", employees=all_data)

# this route is for inserting data

# to mysql database via html forms

@app.route('/insert', methods=['POST'])

def insert():

if request.method == 'POST':

name = request.form['name']

email = request.form['email']

phone = request.form['phone']

my_data = Data(name, email, phone)

db.session.add(my_data)

db.session.commit()

flash("Employee Inserted Successfully")

return redirect(url_for('Index'))

# this is our update route where we are going to

# update our employee

@app.route('/update', methods=['GET', 'POST'])

def update():

if request.method == 'POST':

my_data = Data.query.get(request.form.get('id'))

my_data.name = request.form['name']

my_data.email = request.form['email']

my_data.phone = request.form['phone']

db.session.commit()

flash("Employee Updated Successfully")

return redirect(url_for('Index'))

# This route is for deleting our employee

@app.route('/delete/<id>/', methods=['GET', 'POST'])

def delete(id):

my_data = Data.query.get(id)

db.session.delete(my_data)

db.session.commit()

flash("Employee Deleted Successfully")

return redirect(url_for('Index'))

#run flask app

if __name__ == "__main__":

app.run(debug=True)

Open your index.html file and bring changes to the delete button, basically we want to track the id of the deleted item.

 <a href="/delete/{{row.id}}" class="btn btn-danger btn-xs" 
          onclick="return confirm('Are You Sure To Delete ?')">
         Delete</a>

<a href="/delete/{{row.id}}" class="btn btn-danger btn-xs"

onclick="return confirm('Are You Sure To Delete ?')">

Delete</a>

This is our complete index.html file.

{% extends 'base.html' %}
{% include 'header.html' %}


{% block title %} Home {% endblock %}


{% block body %}

<div class="container">
 <div class="row">
  <div class="col md-12">

   <div class="jumbotron p-3">

    <h2>Manage <b>Employees </b>
     <button type="button" class="btn btn-success float-right"
             data-toggle="modal" data-target="#mymodal">Add New Employees
     </button>
    </h2>


    {% with messages = get_flashed_messages() %}

    {% if messages %}

    {% for message in messages %}

    <div class="alert alert-success alert-dismissable" role="alert">

     <button type="button" class="close" data-dismiss="alert" aria-label="close">

      <span aria-hidden="true">x</span>

     </button>


     {{message}}


    </div>


    {% endfor %}

    {% endif %}
    {% endwith %}


    <table class="table table-hover table-dark">

     <tr>

      <th>ID</th>
      <th>Name</th>
      <th>Email</th>
      <th>Phone</th>
      <th>Action</th>

     </tr>


     {% for row in employees %}
     <tr>
      <td>{{row.id}}</td>
      <td>{{row.name}}</td>
      <td>{{row.email}}</td>
      <td>{{row.phone}}</td>

      <td>
       <a href="/update/{{row.id}}" class="btn btn-warning btn-xs" data-toggle="modal"
          data-target="#modaledit{{row.id}}">Edit</a>
       <a href="/delete/{{row.id}}" class="btn btn-danger btn-xs"
          onclick="return confirm('Are You Sure To Delete ?')">
         Delete</a>


      </td>

     </tr>


     <!-- Modal Edit Employee-->
     <div id="modaledit{{row.id}}" class="modal fade" role="dialog">
      <div class="modal-dialog">


       <div class="modal-content">


        <div class="modal-header">


         <h4 class="modal-title">Update Information</h4>


        </div>


        <div class="modal-body">


         <form action="{{url_for('update')}}" method="POST">


          <div class="form-group">


           <label>Name:</label>
           <input type="hidden" name="id" value="{{row.id}}">

           <input type="text" class="form-control" name="name" value="{{row.name}}">


          </div>


          <div class="form-group">


           <label>Email:</label>

           <input type="text" class="form-control" name="email" value="{{row.email}}">


          </div>


          <div class="form-group">


           <label>Phone:</label>

           <input type="text" class="form-control" name="phone" value="{{row.phone}}">


          </div>


          <div class="form-group">


           <button class="btn btn-primary" type="submit">Update</button>


          </div>


         </form>


        </div>


        <div class="modal-footer">


         <button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>


        </div>


       </div>


      </div>

     </div>

     {% endfor %}


    </table>


   </div>


   <!-- Modal Add Employee-->


   <div id="mymodal" class="modal fade" role="dialog">
    <div class="modal-dialog">
     <div class="modal-content">
      <div class="modal-header">

       <h4 class="modal-title">Add Employee</h4>
      </div>
      <div class="modal-body">

       <form action="{{url_for('insert')}}" method="POST">


        <div class="form-group">

         <label>Name:</label>
         <input type="text" class="form-control" name="name" required="1">


        </div>


        <div class="form-group">


         <label>Email:</label>
         <input type="email" class="form-control" name="email" required="1">


        </div>


        <div class="form-group">


         <label>Phone:</label>
         <input type="number" class="form-control" name="phone" required="1">


        </div>


        <div class="form-group">


         <button class="btn btn-primary" type="submit">Add Employee</button>


        </div>


       </form>


      </div>


      <div class="modal-footer">


       <button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>


      </div>


     </div>


    </div>


   </div>


  </div>

 </div>


</div>


{% endblock %}

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{% extends 'base.html' %}

{% include 'header.html' %}

{% block title %} Home {% endblock %}

{% block body %}

<h2>Manage <b>Employees </b>

<button type="button" class="btn btn-success float-right"

data-toggle="modal" data-target="#mymodal">Add New Employees

</button>

</h2>

{% with messages = get_flashed_messages() %}

{% if messages %}

{% for message in messages %}

</button>

</div>

{% endfor %}

{% endif %}

{% endwith %}

<tr>

<th>Email</th>

<th>Phone</th>

<th>Action</th>

</tr>

{% for row in employees %}

<tr>

<td>{{row.email}}</td>

<td>{{row.phone}}</td>

<td>

<a href="/update/{{row.id}}" class="btn btn-warning btn-xs" data-toggle="modal"

data-target="#modaledit{{row.id}}">Edit</a>

<a href="/delete/{{row.id}}" class="btn btn-danger btn-xs"

onclick="return confirm('Are You Sure To Delete ?')">

Delete</a>

</td>

</tr>

<h4 class="modal-title">Update Information</h4>

</div>

</div>

<label>Email:</label>

</div>

<label>Phone:</label>

</div>

<button class="btn btn-primary" type="submit">Update</button>

</div>

</form>

</div>

<button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>

</div>

{% endfor %}

</table>

</div>

<h4 class="modal-title">Add Employee</h4>

</div>

</div>

<label>Email:</label>

</div>

<label>Phone:</label>

</div>

<button class="btn btn-primary" type="submit">Add Employee</button>

</div>

</form>

</div>

<button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>

</div>

{% endblock %}

templates/header.html

{% extends 'base.html' %}



{% block title %} Flask CRUD {% endblock %}



{% block body %}

<div class="jumbotron p-3">
    <div class="well text-center">

        <h1>Flask CRUD Application - Geekscoders.com</h1>

    </div>


</div>


{% endblock %}

{% extends 'base.html' %}

{% block title %} Flask CRUD {% endblock %}

{% block body %}

<h1>Flask CRUD Application - Geekscoders.com</h1>

</div>

{% endblock %}

templates/base.html

<!DOCTYPE html>
<html lang="en">
<head>


<link rel="stylesheet"
href="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css">

    <meta charset="UTF-8">
    <title>{% block title %} {% endblock %} </title>
</head>
<body>

{% block body %} {% endblock %}


<script
 src="https://code.jquery.com/jquery-3.4.1.slim.min.js">
</script>
<script
src="https://cdn.jsdelivr.net/npm/popper.js@1.16.0/dist/umd/popper.min.js">
</script>
<script
src="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/js/bootstrap.min.js">

</script>

</body>
</html>

<!DOCTYPE html>

<head>

href="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css">

<title>{% block title %} {% endblock %} </title>

</head>

<body>

{% block body %} {% endblock %}

<script

src="https://code.jquery.com/jquery-3.4.1.slim.min.js">

</script>

<script

src="https://cdn.jsdelivr.net/npm/popper.js@1.16.0/dist/umd/popper.min.js">

</script>

<script

src="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/js/bootstrap.min.js">

</script>

</body>

</html>

Run your Flask Application and now you can delete data.

Flask CRUD Application Delete Data From MySQL Database