Django计数RawQuerySet [英] Django count RawQuerySet

问题描述

干草，我使用django 1.2，我想知道如何从原始查询集（RawQuerySet）计数行。

传统的.count（）方法不行。

我的查询

  query = SELECT *，（（ACOS（SIN（％s * PI（）/ 180）* SIN（lat * PI（）/ 180）+ COS（％s * PI（）/ 180）* COS（lat * 180）* COS（（％s  -  lon）* PI（）/ 180））* 180 / PI（））* 60 * 1.1515）距离app_car的距离WHERE价格BETWEEN％s和％s HAVING距离< =％s ORDER BY distance ASC
 
 cars = Car.objects.raw（query，[lat，lat，lon，min_price，max_price，miles]）
 
 return HttpResponse（cars）
  

其返回的

 code> Car_Deferred_model_id_user_id对象
  

任何想法？

解决方案

使用'len（）'函数。这将给出：

  query =SELECT *，（（ACOS（SIN（％s * PI（）/ 180）* SIN（lat * PI（）/ 180）+ COS（％s * PI（）/ 180）* COS（lat * PI（）/ 180）* COS（（％s  -  lon）* PI（）/ 180） * 180 / PI（））* 60 * 1.1515）距离app_car的距离WHERE价格BETWEEN％s和％s HAVING距离< =％s ORDER BY distance ASC
 
 cars = Car.objects.raw （查询，[lat，lat，lon，min_price，max_price，miles]）
 
返回HttpResponse（len（list（cars））
   http://djangoadvent.com/1.2/smoothing-curve/  [看起来该网站可能已经过期，但Internet存档有： http://web.archive.org/web/20110513122309/http ：//djangoadvent.com/1.2/smoothing-curve/ ] 
 
Hay, I'm using django 1.2 and i want to know how to count rows from a raw queryset(RawQuerySet).

The traditional .count() method doesn't work.

Heres my query
query = "SELECT *, ((ACOS(SIN(%s * PI() / 180) * SIN(lat * PI() / 180) + COS(%s * PI() / 180) * COS(lat * PI() / 180) * COS((%s - lon) * PI() / 180)) * 180 / PI()) * 60 * 1.1515) AS distance FROM app_car WHERE price BETWEEN %s AND %s HAVING distance<=%s ORDER BY distance ASC"

cars = Car.objects.raw(query, [lat, lat, lon, min_price, max_price, miles])

return HttpResponse( cars )
And its returning
Car_Deferred_model_id_user_id object
Any ideas?
解决方案
Use the 'len()' function. This would give:
query = "SELECT *, ((ACOS(SIN(%s * PI() / 180) * SIN(lat * PI() / 180) + COS(%s * PI() / 180) * COS(lat * PI() / 180) * COS((%s - lon) * PI() / 180)) * 180 / PI()) * 60 * 1.1515) AS distance FROM app_car WHERE price BETWEEN %s AND %s HAVING distance<=%s ORDER BY distance ASC"

cars = Car.objects.raw(query, [lat, lat, lon, min_price, max_price, miles])

return HttpResponse(len(list(cars))
Aside: there's some useful information on the Django 1.2 Model.objects.raw() method at: http://djangoadvent.com/1.2/smoothing-curve/ [Looks like that site might have expired, but the Internet Archive has it at: http://web.archive.org/web/20110513122309/http://djangoadvent.com/1.2/smoothing-curve/ ]

                        
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