Day15-Django

 all_entries = Entry.objects.all() #查询所有
 Entry.objects.filter(pub_date__year=2006) #查询所有pub_date为2006年的纪录
 Entry.objects.all().filter(pub_date__year=2006) #与上面那句一样
 >>> Entry.objects.filter(   #链式查询
 ...     headline__startswith='What'
 ... ).exclude(
 ...     pub_date__gte=datetime.date.today()
 ... ).filter(
 ...     pub_date__gte=datetime(2005, 1, 30)
 ... )

 one_entry = Entry.objects.get(pk=1) #单条查询

 Entry.objects.all()[:5] #查询前5条
 Entry.objects.all()[5:10] #你猜

 Entry.objects.order_by('headline')[0] #按headline排序取第一条

 Entry.objects.filter(pub_date__lte='2006-01-01') #相当于sql语句SELECT * FROM blog_entry WHERE pub_date <= '2006-01-01';

 Entry.objects.get(headline__exact="Cat bites dog") #相当于SELECT ... WHERE headline = 'Cat bites dog';
 Blog.objects.get(name__iexact="beatles blog") #与上面相同,只是大小写不敏感

 Entry.objects.get(headline__contains='Lennon') #相当 于SELECT ... WHERE headline LIKE '%Lennon%';