切片Django查询集而无需从数据库中检索所有内容

Question

Lets say, I want the first 12 elements from a Django queryset. Now I could easily do this as follows:

queryset = Content.objects.all()[:12]

This works, but I am retrieving every single Content from my database. Is there a better way to do this? I am thinking something that only retrieves the first 12 items from the queryset from the database.

Thanks.

Answer 1

Actually, that is the correct limit syntax for the django ORM. If you open up a shell and try it out you will notice what it is doing.

>>> queryset = Content.objects.all()[:12]
>>> queryset
<QuerySet [...]>
>>> str(queryset.query)
'SELECT * FROM "content" LIMIT 12'