Django模型时间范围过滤方法

Question

我在这里看到了旧问题中接下来的两种方法,但我不清楚它们之间的区别是什么:

{'date_time_field__range': (datetime.datetime.combine(date, datetime.time.min),
                        datetime.datetime.combine(date, datetime.time.max))}

和

YourModel.objects.filter(datetime_published__year='2008', 
                     datetime_published__month='03', 
                     datetime_published__day='27')

Answer 1

我自己对此感到困惑,但我认为我已经解决了这个问题:-DI发现有关范围查找选项的文档非常有用.

当你这样做时:

YourModel.objects.filter(datetime_published__year='2008', 
                     datetime_published__month='03', 
                     datetime_published__day='27')

SQL将类似于:

SELECT ... WHERE EXTRACT('year' FROM pub_date) = '2008'
             AND EXTRACT('month' FROM pub_date) = '03'
             AND EXTRACT('day' FROM pub_date) = '27';

而这部分django的基于通用日期的观点:

{'date_time_field__range': (datetime.datetime.combine(date, datetime.time.min),
                        datetime.datetime.combine(date, datetime.time.max))}

变成这样的东西:

YourModel.objects.filter(datetime_published__range=(
                datetime.datetime.combine('2008-03-27',datetime.time.min),
                datetime.datetime.combine('2008-03-27',datetime.time.max)
                                                                  )

它产生的SQL如下:

SELECT ... WHERE datetime_published BETWEEN '2008-03-27 00:00:00'
                                        AND '2008-03-27 23:59:59';

(最后一个SQL示例中的时间戳格式显然是错误的,但你明白了)

希望这能回答你的问题 :)