Python系列视频教程: Django【13讲】第九讲 数据库使用多对一映射

Python系列视频教程: Django【13讲】第九讲 数据库使用多对一映射



三种关系

many2one

many2many

one2one

我们今天着重看看many2one



python %django_home%\bin\django-admin.py startproject csvt04



cd csvt04

python %django_home%\bin\django-admin.py startapp blog



修改models.py

from django.db import models

# Create your models here.

class Entry(models.Model):

name=models.CharField(max_length=30)

def __unicode__(self):

return self.name

class Blog(models.Model):

name=models.CharField(max_length=30)

#many2one(Blog:Entry)

entry=models.ForeignKey(Entry)

def __unicode__(self):

return self.name



D:\test\mysite\csvt04>python manage.py syncdb
下面操作数据

D:\test\mysite\csvt04>python manage.py shell

Python 2.7.2 (default, Jun 24 2011, 12:21:10) [MSC v.1500 32 bit (Intel)] on win

32

Type "help", "copyright", "credits" or "license" for more information.

(InteractiveConsole)

>>> from blog.models import Entry,Blog

>>> entry1=Entry.objects.create(name='alen')

>>> entry1

<Entry: alen>

>>> entry2=Entry.objects.create(name='max')

>>> entry3=Entry.objects.create(name='carl')

>>> blog1=Blog.objects.create(name='alen_blog 1',entry=entry1)

>>> blog1

<Blog: alen_blog 1>

>>> blog2=Blog.objects.create(name='alen_blog 2',entry=entry1)

>>> blog2

<Blog: alen_blog 2>

>>>

>>> blog1.entry

<Entry: alen>

>>> blog2.entry

<Entry: alen>

>>> entry1.blog_set

<django.db.models.fields.related.RelatedManager object at 0x019C52D0>

>>> entry1.blog_set.all()

[<Blog: alen_blog 1>, <Blog: alen_blog 2>]

>>>

注意这里使用了blog_set



我们在命令中完成了，如何在web界面里面显示这些呢？

下面一节再见