官网网址:https://docs.djangoproject.com/zh-hans/2.0/ref/models/querysets/#field-lookups
exact:
完全符合(区分大小写)
iexact:
不区分大小写的完全匹配
contains:
区分大小写
Entry.objects.get(headline__contains='Lennon')
SQL等价物:
SELECT ... WHERE headline LIKE '%Lennon%';
icontains:
不区分大小写
Entry.objects.get(headline__icontains='Lennon')
SQL等价物:
SELECT ... WHERE headline ILIKE '%Lennon%';