query_set.py 文件源码

def fetch_size(self, v):
        """Sets the number of rows that are fetched at a time.

        *Note that driver's default fetch size is 5000.*

        .. code-block:: python

            for user in User.objects().fetch_size(500):
                print(user)
        """

        if not isinstance(v, six.integer_types):
            raise TypeError
        if v == self._fetch_size:
            return self

        if v < 1:
            raise QueryException("fetch size less than 1 is not allowed")

        clone = copy.deepcopy(self)
        clone._fetch_size = v
        return clone