Django中更新多个对象数据与删除对象的方法

>>> p = Publisher.objects.get(name='Apress')
>>> p.name = 'Apress Publishing'
>>> p.save()

SELECT id, name, address, city, state_province, country, website
FROM books_publisher
WHERE name = 'Apress';

UPDATE books_publisher SET
  name = 'Apress Publishing',
  address = '2855 Telegraph Ave.',
  city = 'Berkeley',
  state_province = 'CA',
  country = 'U.S.A.',
  website = 'http://www.apress.com'
WHERE id = 52;

>>> Publisher.objects.filter(id=52).update(name='Apress Publishing')

UPDATE books_publisher
SET name = 'Apress Publishing'
WHERE id = 52;

>>> Publisher.objects.all().update(country='USA')
2

>>> p = Publisher.objects.get(name="O'Reilly")
>>> p.delete()
>>> Publisher.objects.all()
[<Publisher: Apress Publishing>]

>>> Publisher.objects.filter(country='USA').delete()
>>> Publisher.objects.all().delete()
>>> Publisher.objects.all()
[]

>>> Publisher.objects.delete()
Traceback (most recent call last):
 File "<console>", line 1, in <module>
AttributeError: 'Manager' object has no attribute 'delete'

>>> Publisher.objects.all().delete()

>>> Publisher.objects.filter(country='USA').delete()