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模型二

基本的数据访问   直接上代码吧  比较简单的操作。

>>> from book.models import Publisher
>>> p1 = Publisher(name=Apress, address=2855 Telegraph Avenue,city=Berkeley, state_province=CA, country=U.S.A.,website=http://www.apress.com/)
>>> p1.save()
>>> p2 = Publisher(name="O‘Reilly", address=10 Fawcett St.,city=Cambridge, state_province=MA, country=U.S.A.,website=http://www.oreilly.com/)
>>> p2.save()
>>> publisher_list = Publisher.objects.all()
>>> publisher_list
<QuerySet [<Publisher: Publisher object>, <Publisher: Publisher object>]>
>>> type(publisher_list)
<class django.db.models.query.QuerySet>
>>> for i in publisher_list:
...     i
... 
<Publisher: Publisher object>
<Publisher: Publisher object>
>>> for i in publisher_list:
...     i.name
... 
Apress
"O‘Reilly"
>>> Publisher.objects.create(name="O‘Yuqn", address=11 Fawcett St.,city=Cambridge, state_province=MA, country=U.S.A.,website=http://www.oreilly.com/)<Publisher: Publisher object>

>>> Publisher.objects.create(name="O‘Y11uqn", address=11 Fa11wcett St.,city=11Cambridge, state_province=11MA, country=U.111S.A.,website=http://www.orei11lly.com/)
<Publisher: Publisher object>
>>> publisher_list = Publisher.objects.all()
>>> for i in publisher_list:
...     i.name
... 
Apress
"O‘Reilly"
"O‘Yuqn"
"O‘Y11uqn"

如果我们要删除对象的话,删除数据库中的对象只需调用该对象的delete()方法即可:

>>> p = Publisher.objects.get(name="O‘Reilly")
>>> p.delete()
>>> Publisher.objects.filter(country=USA).delete()
>>> Publisher.objects.all().delete()

更新对象,很简单,先获取对象然后将其当做一般的变量进行赋值即可。当然还是要保存的。

>>> p.name = Apress Publishing
>>> p.save()

 

模型二