即q1.filter(pub_date__gte=datetime.date.today())表示为时间>=now,q1.exclude(pub_date__gte=datetime.date.today())表示为<=now 4“在django models中取得一个字段的distinct值”。就是select distinct xxx from table_name ...这样的功能。使用values会生成ValuesQuerySet(形如N个dict组成的list),猜测大...
通过values()可以让QuerySet执行它包含的SQL语句,从而从数据库中得到值。这个值以字典返回,可以用于下游的.filter()的参数值。 # 这时候的source_id是QuerySet数据类型,无法调用.id得到id值。 source_id = Source.objects.filter(type=source_type) #即,下面这句是错误的: reference = Reference.objects.filter(...
#自定义filter,自定义SimpleTag,在app根目录创建templates目录,创建tmpTags.py文件, fromdjangoimporttemplate register=template.Library() #固定写法#自定义过滤器@register.filterdefdemo_filter(x): #x可以为后端返回的参数ifx == 1:return'success'else:return'faild' #前端; {%loadtmpTags %} {{status|demo...
If the custom through table defined by the intermediate model does not enforce uniqueness on the (model1, model2) pair, allowing multiple values, the remove() call will remove all intermediate model instances: >>> Membership.objects.create( ... person=ringo, ... group=beatles, ... da...
Entry.objects.filter(pub_date__year=2005).order_by('-pub_date','headline') 按照外键字段排序 比如Entry 这个 model 需要按照外键 Blog 的 name 字段来排序,则通过外键字段+双下划线+排序字段来实现: Entry.objects.order_by('blog__name') 如果我们在查询 Entry 的时候直接根据外键字段,也就是 blog 来...
If the custom through table defined by the intermediate model does not enforce uniqueness on the (model1, model2) pair, allowing multiple values, the remove() call will remove all intermediate model instances: >>> Membership.objects.create(person=ringo, group=beatles, ... date_joined=date(...
1、下述代码查询model对应数据库中日期等于2018-05-22的数据: queryset = model.objects.all() condtions: {'date': '2018-05-22'} query_res = queryset.filter(**condtions) 2、下述代码查询model对应数据库中日期小于2018-05-22的数据: queryset = model.objects.all() ...
# 表结构 class A(models.Model): name = models.CharField(u'名称') class B(models.Model): aa = models.ForeignKey(A) # 查询语句 B.objects.filter(aa__name__contains='searchtitle') 反向查询: # 表结构 class A(models.Model): name = models.CharField(u'名称') class B(models.Model): aa...
filter()filter(**kwargs)Returns a new QuerySet containing objects that match the given lookup parameters. The lookup parameters (**kwargs) should be in the format described in Field lookups below. Multiple parameters are joined via AND in the underlying SQL statement. If you need to execute ...
ret=models.Book.objects.filter(title="python").values("price","title") print(ret) # <QuerySet [{'price': Decimal('122.00')}]> #查询python这本书的出版社的名称和地址 # 正向查询 按字段 基于book表 # ret2=models.Book.objects.filter(title="python").values_list("publisher__name") ...