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Django QuerySet - 获取数据


获取数据

有多种方法可以从模型中获取数据到 QuerySet 中。


values() 方法

values() 方法允许您将每个对象返回为 Python 字典,其中名称和值作为键/值对。

示例

views.py:

from django.http import HttpResponse
from django.template import loader
from .models import Member

def testing(request):
  mydata = Member.objects.all().values()
  template = loader.get_template('template.html')
  context = {
    'mymembers': mydata,
  }
  return HttpResponse(template.render(context, request))
运行示例 »

返回特定列

values_list() 方法允许您仅返回您指定的列。

示例

仅返回 firstname

views.py:

from django.http import HttpResponse
from django.template import loader
from .models import Member

def testing(request):
  mydata = Member.objects.values_list('firstname')
  template = loader.get_template('template.html')
  context = {
    'mymembers': mydata,
  }
  return HttpResponse(template.render(context, request))
运行示例 »

返回特定行

您可以使用 filter() 方法过滤搜索,以仅返回特定行/记录。

示例

仅返回 firstname 为 'Emil' 的记录

views.py:

from django.http import HttpResponse
from django.template import loader
from .models import Member

def testing(request):
  mydata = Member.objects.filter(firstname='Emil').values()
  template = loader.get_template('template.html')
  context = {
    'mymembers': mydata,
  }
  return HttpResponse(template.render(context, request))
运行示例 »

您将在下一章中了解更多关于 filter() 方法的信息。



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