Django的ORM中如何判断查询结果是否为空，判断django中的orm为空

 

 

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result= Booking.objects.filter()     #方法一 .exists() if result.exists():     print "QuerySet has Data" else:     print "QuerySet is empty" #方法二 .count()==0 if result.count() == 0:     print "empty" #方法三 if result:     print "QuerySet has Data" else:     print "QuerySet is empty"   总结： QuerySet.exists() > QuerySet.count()==0 > QuerySet