In this article we are going to learn Flask CRUD Application with SQLAlchemy , we are going to build web application that you can create employee, read employee data from mysql database, update employee data and also delete employee. also we are using SQLAlchemy for this tutorial, if your interested in the video for this course you can check below.
Python Web Development Tutorials 1: Flask Web Development Tutorials
2: Django Web Development Tutorials
Also you can read more articles on Python GUI Development
1: TKinter GUI Development Tutorials
2: Pyside2 GUI Development Tutorials
3: wxPython GUI Development Tutorials
4: Kivy GUI Development Tutorials
What is Flask ? Flask is a web framework. This means flask provides you with tools, libraries and technologies that allow you to build a web application. This web application can be some web pages, a blog, a wiki or go as big as a web-based calendar application or a commercial website.
Flask is part of the categories of the micro-framework. Micro-framework are normally framework with little to no dependencies to external libraries. This has pros and cons. Pros would be that the framework is light, there are little dependency to update and watch for security bugs, cons is that some time you will have to do more work by yourself or increase yourself the list of dependencies by adding plugins.
What is SQLAlchemy ? SQLAlchemy is the Python SQL toolkit and Object Relational Mapper that gives application developers the full power and flexibility of SQL.
It provides a full suite of well known enterprise-level persistence patterns, designed for efficient and high-performing database access, adapted into a simple and Pythonic domain language.
What is Flask-SQLAlchemy ? Flask-SQLAlchemy is an extension for Flask that adds support for SQLAlchemy to your application. It aims to simplify using SQLAlchemy with Flask by providing useful defaults and extra helpers that make it easier to accomplish common tasks.
See the SQLAlchemy documentation to learn how to work with the ORM in depth. The following documentation is a brief overview of the most common tasks, as well as the features specific to Flask-SQLAlchemy.
Also you can watch the complete video for Flask CRUD Application with SQLAlchemy
VIDEO
Installation For this article first you need to install flask, and after that you need to install flask-sqlalchemy.
pip install Flask - SQLAlchemy
OK after the installation first you need to create a database, iam using Wamp Server Pycharm IDE BootstrapCDN .
Flask CRUD Project Structure
So you can see i have static folder, but because iam using BootstrapCDN, iam not going to add bootstrap and jquery files in their. in the templates folder i have the HTML files that i need for this tutorial.
Let’s add our codes in our app.py .
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
from flask import Flask , render_template , request , redirect , url_for , flash
from flask_sqlalchemy import SQLAlchemy
app = Flask ( __name__ )
app . secret_key = "Secret Key"
#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
#This is the index route where we are going to
#query on all our employee data
@ 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' ) )
if __name__ == "__main__" :
app . run ( debug = True )
In this code we have created our Mysql Database configuration. you can see that our database
name is crud.
#SqlAlchemy Database Configuration With Mysql
app . config [ 'SQLALCHEMY_DATABASE_URI' ] = 'mysql://root:' '@localhost/crud'
app . config [ 'SQLALCHEMY_TRACK_MODIFICATIONS' ] = False
And this is our database model.
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
This is our base.html .
templates/base.html
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
< ! DOCTYPE html >
< html lang = "en" >
< head >
< link rel = "stylesheet" href = "https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css" integrity = "sha384-Vkoo8x4CGsO3+Hhxv8T/Q5PaXtkKtu6ug5TOeNV6gBiFeWPGFN9MuhOf23Q9Ifjh" crossorigin = "anonymous" >
< 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" integrity = "sha384-J6qa4849blE2+poT4WnyKhv5vZF5SrPo0iEjwBvKU7imGFAV0wwj1yYfoRSJoZ+n" crossorigin = "anonymous" > </script>
<script src = "https://cdn.jsdelivr.net/npm/popper.js@1.16.0/dist/umd/popper.min.js" integrity = "sha384-Q6E9RHvbIyZFJoft+2mJbHaEWldlvI9IOYy5n3zV9zzTtmI3UksdQRVvoxMfooAo" crossorigin = "anonymous" > </script>
<script src = "https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/js/bootstrap.min.js" integrity = "sha384-wfSDF2E50Y2D1uUdj0O3uMBJnjuUD4Ih7YwaYd1iqfktj0Uod8GCExl3Og8ifwB6" crossorigin = "anonymous" > </script>
< / body >
< / html >
In here we have created our header.html .
templates/header.html
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
{ % extends 'base.html' % }
{ % block title % } Flask CRUD { % endblock % }
{ % block body % }
< div class = "jumbotron p-3" >
< div class = "well text-center" >
< h1 > Python Flask CRUD Web Application Development < / h1 >
< / div >
< / div >
{ % endblock % }
And this is our index.html.
templates/index.html
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
{ % 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 % }
So now run the complete project and this will be the result.
Flask CRUD Application with SQLAlchemy Subscribe and Get Free Video Courses & Articles in your Email
If it was useful, Please share the article
