Part 1: Project, Database, Application, API

Original: http://docs.djangoproject.com/en/dev/intro/tutorial01/

Beispiel: Umfrage (Poll) mit Stimmen (Votes)

Creating a project

Project: DB-Config, installierte Applikationen, keine Models, wenig Python Code, in der Regel

nur einmal installiert.

Applikation: Models, Python Code, ... wiederverwendbar.

Ein Projekt besteht aus N Applikationen.

django-admin.py startproject mysite

Erstellt:

mysite/
    __init__.py
    manage.py
    settings.py
    urls.py

The development server

python manage.py runserver:

Validating models...
0 errors found.

Django version 1.0, using settings 'mysite.settings'
Development server is running at http://127.0.0.1:8000/
Quit the server with CONTROL-C.

firefox http://127.0.0.1:8000/

Database setup

Edit settings.py.

DATABASE_ENGINE (Tipp: postgresql_psycopg2 oder sqlite3), DATABASE_NAME, DATABASE_USER ...

INSTALLED_APPS:

• django.contrib.auth – User, Group, Permission ...
• django.contrib.sessions

python manage.py syncdb

Entsprechend den Models der installlierten Applikationen werden Tabellen in der DB erstellt.

Creating models

python manage.py startapp polls

Erstellt:

polls/

__init__.py models.py views.py

Edit polls/models.py:

from django.db import models

class Poll(models.Model):
    question = models.CharField(max_length=200)
    pub_date = models.DateTimeField('date published')

class Choice(models.Model):
    poll = models.ForeignKey(Poll)
    choice = models.CharField(max_length=200)
    votes = models.IntegerField()

Model Klasse –> Tabelle

Attribut (Field) –> Spalte einer Tabelle

Objekt/Instanz –> Zeile einer Tabelle

Edit settings.py, ‘mysite.polls’ einbinden:

INSTALLED_APPS = (
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.sites',
    'mysite.polls'
)

python manage.py syncdb

... Tabellen werden erstellt.

Playing with the API

...