Django计数RawQuerySet [英] Django count RawQuerySet
问题描述
Hay,我使用django 1.2,我想知道如何从原始查询集(RawQuerySet)中计算行。
传统的.count
query = SELECT *,((ACOS(SIN(%s * PI()/ 180)* SIN(lat * PI()/ 180)+ COS 180)* COS((%s-lon)* PI()/ 180))* 180 / PI())* 60 * 1.1515)AS距离app_car WHERE价格%s和%s具有距离<=%s ORDER BY距离ASC
cars = Car.objects.raw(query,[lat,lat,lon,min_price,max_price,miles])
return HttpResponse b $ b
并返回
Car_Deferred_model_id_user_id object
任何想法?
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 * 180 / PI())* 60 * 1.1515)AS距离app_car WHERE价格BETWEEN%s和%s HAVING距离<=%s ORDER BY距离ASC
cars = Car.objects.raw (查询,[lat,lat,lon,min_price,max_price,miles])
return HttpResponse(len(list(cars))
Aside:有关Django 1.2 Model.objects.raw()方法的一些有用信息: http://djangoadvent.com/1.2/smoothing-curve/ [看起来该网站可能已过期,但Internet存档拥有它: 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?
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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