Django查询__isnull = True或= None [英] Django Query __isnull=True or = None
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问题描述
这是一个简单的问题。我想知道写的内容是否相同:
this is a simple question. I'd like to know if it is the same to write:
queryset = Model.objects.filter(field=None)
比:
queryset = Model.objects.filter(field__isnull=True)
我正在使用django 1.8
I'm using django 1.8
推荐答案
它们相等:
>>> str(Person.objects.filter(age__isnull=True).query) == str(Person.objects.filter(age=None).query)
True
>>> print(Person.objects.filter(age=None).query)
SELECT "person_person"."id", "person_person"."name", "person_person"."yes", "person_person"."age" FROM "person_person" WHERE "person_person"."age" IS NULL
>>> print(Person.objects.filter(age__isnull=True).query)
SELECT "person_person"."id", "person_person"."name", "person_person"."yes", "person_person"."age" FROM "person_person" WHERE "person_person"."age" IS NULL
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