我是 Django 新手,但我想到的应用程序最终可能会有如下所示的 URL:
http://mysite/compare/id_1/id_2
其中“id_1”和“id_2”是两个不同模型对象的标识符。在“比较”的处理程序中,我想异步并行地查询和检索对象 id_1 和 id_2。
有没有办法使用标准的 Django 语法来做到这一点?我希望伪代码最终看起来像这样:
import django.async
# Issue the model query, but set it up asynchronously.
# The next 2 lines don't actually touch my database
o1 = Object(id=id_1).async_fetch()
o2 = Object(id=id_2).async_fetch()
# Now that I know what I want to query, fire off a fetch to do them all
# in parallel, and wait for all queries to finish before proceeding.
async.Execute((o2,o2))
# Now the code can use data from o1 and o2 below...
最佳答案
没有您所描述的严格异步操作,但我认为您可以通过使用 django 的 in_bulk 来达到相同的效果查询运算符,它接受要查询的 id 列表。
urls.py
是这样的:
urlpatterns = patterns('',
(r'^compare/(\d+)/(\d+)/$', 'my.compareview'),
)
还有这个 View :
def compareview(request, id1, id2):
# in_bulk returns a dict: { obj_id1: <MyModel instance>,
# obj_id2: <MyModel instance> }
# the SQL pulls all at once, rather than sequentially... arguably
# better than async as it pulls in one DB hit, rather than two
# happening at the same time
comparables = MyModel.objects.in_bulk([id1, id2])
o1, o2 = (comparables.get(id1), comparables.get(id2))
关于python - 异步 Django 模型查询是否可行?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/918298/