Web application development with Django framework

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Web Application Development Django Framework Fabrizio Lapiello IT Eng. Student http://flapiello.com

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Table of contents “Step by Step” 2

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Table of contents “Step by Step” Step 0: Django Introduction Step 1: Admin Panel Step 2: URL Step 3: Creating an application 2

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Step 0 Introduction: DjangoFramework 3

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Step 0 Introduction: Django Framework 0) The Framework 1) MTV Pattern 2) DBMS 3) Setup 4) “Hello World” 4.1) Creating and compiling 4.2) Creating a View 3

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The Framework: What isDjango? 4

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The Framework: What is Django? Django is a great framework for building Web 2.0 applications! It 'was designed to improve development time and quality. http://www.djangoproject.org 4

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MTV Pattern “Model-Template-View” 5

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MTV Pattern “Model-Template-View” A pattern that helps to separate the user interface level from the other parts of the system. Model - contains classes whose instances represent the data to display and manipulate. Template - contains objects that control and manage user interaction with the model and view layers. View - contains the objects used in the UI to display the data in the model. 5

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DBMS “Database management system” Some of the most well-known DBMS used in Django: 6

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DBMS “Database management system” Some of the most well-known DBMS used in Django: 6

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Prior Knowledge 7

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Prior Knowledge ...that’s all! 7

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Good reasons tolearn Python Well-known companies have adopted it for their business: 8

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Good reasons tolearn Python Well-known companies have adopted it for their business: 8

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Setup 9

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Setup Download: http://www.djangoproject.com/download/ Setup Guide: http://docs.djangoproject.com/en/dev/intro/install/ Official Documentation: http://docs.djangoproject.com/ 9

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Creating and compilingproject 10

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Creating and compilingproject $ django-admin.py startproject hello -> __Init__.py manage.py settings.py urls.py $ python manage.py runserver -> 0 Error Found http://127.0.0.1:8000 -> Worked!! 10

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Creating a view First Step 11

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Creating a view First Step First of all combining a URL to a view -> http://127.0.0.1:8000/hello Open the file urls.py and insert the following string as the last parameter: -> (r’^hello/$’, “views.hello”) 11

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Creating a view First Step First of all combining a URL to a view -> http://127.0.0.1:8000/hello Open the file urls.py and insert the following string as the last parameter: -> (r’^hello/$’, “views.hello”) 11

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Creating a view First Step First of all combining a URL to a view -> http://127.0.0.1:8000/hello Open the file urls.py and insert the following string as the last parameter: -> (r’^hello/$’, “views.hello”) Regular expression that indicates the beginning and the end of the URL. 11

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Creating a view First Step First of all combining a URL to a view -> http://127.0.0.1:8000/hello Open the file urls.py and insert the following string as the last parameter: -> (r’^hello/$’, “views.hello”) Regular expression that indicates the beginning and the end of the URL. 11

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Creating a view First Step First of all combining a URL to a view -> http://127.0.0.1:8000/hello Open the file urls.py and insert the following string as the last parameter: -> (r’^hello/$’, “views.hello”) Regular expression that indicates the beginning Combining Url/Vista and the end of the URL. 11

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Creating a view Second Step The view is simply a Python method that returns the data. In the root of the project we create the views.py file and insert the following method: from django.http import HttpResponse def hello(request): return HttpResponse(“Hello World”) Now type in a terminal: $ python manage.py runserver 12

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Step 1 Admin Panel 13

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Step 1 Admin Panel 0) Creating applications 1) Creating models 2) Add a Database 3) ORM 4) Creating Admin Panel 13

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Creating Applications Is goodpractice to structure the project into sub-applications in order to have greater control over the entire system to be developed! $ python manage.py startapp test If there aren't errors in the root of the project should have a folder named "test" with the following files inside __init__.py models.py views.py Inatalled_Apps indicate the presence in the settings.py file, application "test" by simply inserting his name in quotes at the bottom of the list. 14

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Creating models Change themodels.py file in the folder "test "... from django.db import models class Persona (models.Model): nome = models.CharField(max_length=50) cognome = models.CharField(max_length=50) def __unicode__(self): return u"%s %s" % (self.nome, self.cognome) class Meta: verbose_name_plural ="Persone" 15

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Add a Database Editthe settings.py file in the following way: DATABASES = { 'default': { 'ENGINE': 'sqlite3', #NAME del dbms es (oracle, mysql etc..) 'NAME': 'test.db', #DB NAME 'USER': '', #USERNAME 'PASSWORD': '', #Password 'HOST': '', #DMBS ADDRESS 'PORT': '', #PORT } } 16

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ORM “Object-Relational Mapping” 17

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ORM “Object-Relational Mapping” An ORM is a kind of linker between objects and relational databases. 17

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ORM “Object-Relational Mapping” An ORM is a kind of linker between objects and relational databases. Through this linker the created objects with a high-level language are included in the relational database. 17

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ORM “Object-Relational Mapping” An ORM is a kind of linker between objects and relational databases. Through this linker the created objects with a high-level language are included in the relational database. $ python manage.py syncdb 17

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Creating Admin Panel First Step Open the file settings.py INSTALLED_APPS and insert in the application for the board of directors as follows: INSTALLED_APPS = ( 'django.contrib.auth', 'django.contrib.contenttypes', 'django.contrib.sessions', 'django.contrib.sites', 'django.contrib.messages', 'django.contrib.admin', ) 18

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Creating Admin Panel Second Step Associate a URL to the application, then edit the urls.py file as follows: from django.contrib import admin admin.autodiscover() urlpatterns = patterns('', (r'^admin/', include(admin.site.urls)), (r'^hello/$', "views.hello"), ) 19

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Creating Admin Panel Second Step Associate a URL to the application, then edit the urls.py file as follows: from django.contrib import admin admin.autodiscover() urlpatterns = patterns('', ! (r'^admin/', include(admin.site.urls)), là (r'^hello/$', "views.hello"), oi ) E t V 19

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Step 2 URL 20

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Step 2 URL 0) URL 1) Creating an URL 20

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URL Uniform Resource Locator Benefit of having "ordered" URL - Easy to remember - Palatability by search engines - Durable Example: 1) http://nomedominio.com/index.php?option=com_content&view=category&layout=blog&id=3&Itemid=17 2) http://nomedominio.com/blog 21

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URL Uniform Resource Locator Benefit of having "ordered" URL - Easy to remember - Palatability by search engines - Durable n g! yi r rif Ho Example: 1) http://nomedominio.com/index.php?option=com_content&view=category&layout=blog&id=3&Itemid=17 2) http://nomedominio.com/blog 21

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URL Uniform Resource Locator Benefit of having "ordered" URL - Easy to remember - Palatability by search engines - Durable n g! yi r rif Ho Example: 1) http://nomedominio.com/index.php?option=com_content&view=category&layout=blog&id=3&Itemid=17 2) http://nomedominio.com/blog 21

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URL Uniform Resource Locator Benefit of having "ordered" URL - Easy to remember - Palatability by search engines - Durable n g! yi r rif Ho Example: 1) http://nomedominio.com/index.php?option=com_content&view=category&layout=blog&id=3&Itemid=17 2) http://nomedominio.com/blog to be rep lac ed 21

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Creating URL To createa URL like the following -> http://127.0.0.1:8000/hello you have to combine the view of the URL, so, you have to open the file urls.py and insert the following string as the last parameter: -> (r’^hello/$’, “views.hello”) 22

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Creating URL To createa URL like the following -> http://127.0.0.1:8000/hello you have to combine the view of the URL, so, you have to open the file urls.py and insert the following string as the last parameter: -> (r’^hello/$’, “views.hello”) Regular expression that indicates the beginning and the end of the URL. 22

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Creating URL To createa URL like the following -> http://127.0.0.1:8000/hello you have to combine the view of the URL, so, you have to open the file urls.py and insert the following string as the last parameter: -> (r’^hello/$’, “views.hello”) Regular expression that indicates the beginning Combining Url/Vista and the end of the URL. 22

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Step 3 Creating anapplication 23

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Step 3 Creating anapplication DEMO 23

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Contacts A Q F Fabrizio Lapiello IT Eng. Student Email: flapiello@aol.com Web: http://lfapiello.com

Web application development with Django framework

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