1.执行命令 ： python manage.py shell 打开一个控制台
2. 执行如下命令序列进行,并查看结果
>>>from polls.models import Choice,Question
>>>Question.objects.all()
>>>from django.utils import timezone
>>>q = Question(question_text =" What 's new ?",pub_date=timezone.now())
>>>q.save()
>>>q.id
>>>q.question_text
>>>q.pub_date
>>>q.question_text = "What's up?"
>>>q.save()
>>>Question.objects.all()
3.修改数据模型：
再执行shell命令，并查看结果：
>>> from polls.models import Choice,Quesiton
>>>Question.objects.all()
>>>Question.objects.filter(id=1) #相当于where id=1
>>>Question.objects.filter(question_text__startswith='What')
>>>from django.utils import timezone
>>>current_year = timezone.now().year
>>>Question.objects.get(pub_date__year=current_year)
>>>Question.objects.get(id=2)
这个会报错是正常的，错误如下：
Tranceback (most recent call last):
...
DoesNotExist :Question matching query does not exist.
>>>Question.objects.get(pk=1) #pk其实就是id，pk的意思就是关键字
>>>q = Question.objects.get(pk=1)
>>>q.was_published_recently() #返回结果是True
>>>q = Question.objects.get(pk=1)
>>> q.choice_set.all() #取关联的所有数据
>>>q.choice_set.create(choice_text='Not much',votes=0)
>>>q.choice_set.create(choice_text='The sky',votes=0)
>>>c=q.choice_set.create(choice_text='Just hacking again',voites=0)
>>>c.question
>>>q.choice_set.all()
>>>q.choice_set.count() #返回3
>>>Choice.objects.filter(question__pub_date__year =current_year)
>>>c=q.choice_set.filter(choice_text__startswith='Just hacking')
>>>c.delete() #删除