Objects聚合分組，統計結果個數（Count）

參考：http://python.usyiyi.cn/django/topics/db/aggregation.html

from django.db.models import Count

today = datetime.datetime.now()
p1 = datetime.timedelta(days=1)
users_today = lockoutusers.objects.filter(lockouttime__range=[(today-p1).date(),(today+p1).date()]) #獲取當天的item記錄

users_today.values('sAMAccountName').annotate(num=Count('sAMAccountName')) #對sAMAccountName字段進行分組，並得出個數

返回結果：

[{'num': 1, 'sAMAccountName': u'zhongwenming'}, {'num': 1, 'sAMAccountName': u'sunqian'},...(remaining elements truncated)...']

 

 

假設有以下 model:

class Foobar(models.Model): name = models.CharField(max_length=100) date_created = models.DateField(auto_now_add=True) def __unicode__(self): return self.name 

按天統計數量的代碼如下：

from django.db import connection from django.db.models import Count select = {'day': connection.ops.date_trunc_sql('day', 'date_created')} Foobar.objects.extra(select=select).values('day').annotate(number=Count('id')) # [{'number': 10, 'day': datetime.datetime(2013, 9, 29, 0, 0, 0}]