Django tutorial

Django Workshop Rapid Web application Development Sarath Lakshman http://www.sarathlakshman.info FOSSMeet
@ NITC 2010

Django Workshop

Django Workshop Overview of this Tutorial ➔ Brief introduction and
philosophy ➔ Views ➔ URL Conf ➔ Templates ➔ Admin interface ➔ Hands-on code ➔ Building a quick blog application

Django Workshop Django's Mission Statement “Django is a high-level Python
web framework that encourages rapid development and clean, pragmatic design.”

Django Workshop MVC Model View Controller

Django Workshop Django Requirements ➔ Python (2.3+) ➔ PostgreSQL /
MySQL / SQLite / ... ➔ Apache + mod_python / FastCGI / ...

Django Workshop Installation $ sudo apt-get install python-django OR $
wget http://www.djangoproject.com/download/1.1.1/tarball/ $ tar xzvf Django-1.1.1.tar.gz $ cd Django-1.1.1 $ sudo python setup.py install

Django Workshop “Projects” $ django-admin.py startproject $ django-admin.py startproject myproject
myproject

Django Workshop myproject/ myproject/ __init__.py __init__.py manage.py manage.py settings.py settings.py
urls.py urls.py

Django Workshop $ ./manage.py runserver $ ./manage.py runserver Validating models...
0 errors found. Django version 1.1.1, using settings 'myproject.settings' Development server is running at http://127.0.0.1:8000/ Quit the server with CONTROL-C. Development server

Django Workshop

Django Workshop “Apps” $ django-admin.py startapp helloweb $ django-admin.py startapp
helloweb INSTALLED_APPS INSTALLED_APPS 'myproject.helloweb' 'myproject.helloweb'

Django Workshop myproject/ helloweb/ __init__.py models.py views.py __init__.py manage.py settings.py
urls.py

Django Workshop Project settings settings.py

Django Workshop URL Conf Collection URL maps which describes which
url show map to which view function arranged in urls.py

Django Workshop “Views” Collection of functions which return html data
for different pages arranged in views.py

Django Workshop Templates Template is what 'template' means. html..css..javascript..etc kept
in a file for repeated usage.

Django Workshop “Models” In Django, Models are the Data store.
Models are high level object oriented interfaces for databases where the object schema is defined in model.py Forget about messes with “SELECT * FROM TABLE.. blah blah”

Django Workshop Concept to Code 1. Create project – django-admin
createproject 2. Settings - settings.py 3. Create application - ./manage.py startapp 4. Write Models scheme – models.py 5. Sync database - ./manage syncdb 6. Views & templates – view.py 7. URLConf – urls.py 8. Done

Django Workshop Code Hands-on A helloweb application

Django Workshop Views from django.http import HttpResponse from django.http import
HttpResponse def index(request): def index(request): html = “<h1>Hello Web !</h1>” html = “<h1>Hello Web !</h1>” return HttpResponse(html) return HttpResponse(html) views.py

Django Workshop URL Conf from django.conf.urls.defaults import * from django.conf.urls.defaults
import * urlpatterns = patterns('', urlpatterns = patterns('', (r'^helloweb/$', 'helloweb.views.index'), (r'^helloweb/$', 'helloweb.views.index'), ) ) urls.py

Django Workshop More on Views # Processing GET # Processing
GET request request def process_get(request): def process_get(request): html = “Not a GET request” html = “Not a GET request” if request.GET.has_key('page_no'): if request.GET.has_key('page_no'): html = “You have requested %d” % html = “You have requested %d” % request.GET['page_no'] request.GET['page_no'] return HttpResponse(html) return HttpResponse(html) Other dictionary objects Other dictionary objects request.POST request.POST request.session request.session

Django Workshop Using Templates settings.py TEMPLATE_DIRS = ( "/home/slynux/helloweb/html_templates" )
/home/slynux/helloweb/html_templates/template1.html <html> <head><title>HelloWeb django</title></head> <body> <p> This is a sample page</p> <table> <tr><td>Student</td><td>Roll No</td></tr> <tr><td>Sarath</td><td>22</td></tr> <tr><td>Slynux</td><td>44</td></tr> </table> </body> </html>

Django Workshop Using Templates File: /home/slynux/helloweb/html_templates/template2.html <html> <head><title>HelloWeb django</title></head> <body>
<p> This is a sample page</p> <table> <tr><td>Student</td><td>Roll No</td></tr> {% for name,rollno in student_list.items() %} <tr> <td>{{ name }}</td> <td>{{ rollno }}</td> </tr> {% endfor %} </table> </body> </html>

Django Workshop View with Template def template_view1(request): from django.shortcuts import
render_to_response return render_to_response('template1.html',{}) def template_view2(request): from django.shortcuts import render_to_response students = { 'Sarath':22, 'Slynux':34 } return render_to_response('template2.html', {'student_list':students } )

Django Workshop Using Models / Datastore settings.py DATABASE_ENGINE = 'sqlite3'
DATABASE_NAME = '/home/slynux/fossmeet.in/db.sqlite' models.py from django.db.models class StudentRegister(models.Model): name = models.CharField(max_length=30) rollno = models.IntegerField() admission_date = models.DateTimeField() $ ./manage.py syncdb Creating student_studentregister Loading 'initial_data' fixtures... No fixtures found. $./manage.py sql helloweb

Django Workshop Using Models in Views students = { 'Sarath':22,
'Slynux':34 } is static. We can use dynamic content from database from helloweb.student.models import StudentRegister slist = StudentRegister.objects.all() students = {} for s in slist: students[s.name] = s.rollno

Django Workshop Using Models The django python shell $ ./manage
shell >>> from helloweb.student.models import StudentRegister >>> sobj = StudentRegister() >>> sobj.name = “Slynux” >>> sobj.rollno = 40 >>> sobj.admission_date = '2009-11-01' >>> sobj.save() >>> StudentRegister.objects.all() [<StudentRegister: StudentRegister object>] >>> sob = StudentRegister.objects.get(name='Slynux') >>> sob.delete()

Django Workshop Admin interface Django comes with a builtin Admin
interface which can be further customized.

Django Workshop Admin interface

Django Workshop Activating Admin settings.py Add 'django.contrib.admin', to INSTALLED_APPS tuple
urls.py #Uncomment from django.contrib import admin admin.autodiscover() (r'^admin/', include(admin.site.urls)), $ ./manage.py syncdb

Django Workshop Adding Models to Admin Application directory/admin.py from django.contrib
import admin from myproject.hellweb.models import StudentRegister admin.site.register(StudentRegister)

Django Workshop Hands-on code Writing a Blogging web application •
Using template.html • Models title,post,category,date • Admin interface • Content search • Filter post by category

Django Workshop Google Appengine http://code.google.com/appengine

Django Workshop Thank you for listening. Sarath Lakshman [email protected] http://www.sarathlakshman.info
http://twitter.com/t3rm1n4l

Django Workshop

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