Django—模型—数据查询（自定义管理器）

• models.py

  ---

  from django.db import models
  from django.db.models import Manager
  
  
  # 扩展Manager管理器功能
  class MyManager(Manager):
      # 获取结果集，
      def get_queryset(self):
          # 获取查询结果集
          # data =
          # 把sex不为空显示出来
          # data = filter(sex__isnull=True)
          return super().get_queryset().filter(sex__isnull=False)
  
      def after(self, date):
          data = User.objects.filter(regtime__gt=date)
          return data
  
  
  
  class Detail(models.Model):
      did = models.AutoField(primary_key=True)
      phone = models.CharField(max_length=20, blank=True, null=True)
      uid = models.IntegerField(blank=True, null=True)
  
      class Meta:
          managed = False
          db_table = 'detail'
  
  class User(models.Model):
      uid = models.AutoField(primary_key=True)
      username = models.CharField(unique=True, max_length=30)
      password = models.CharField(max_length=128)
      regtime = models.DateTimeField()
      sex = models.IntegerField(blank=True, null=True)
  
      class Meta:
          managed = False
          db_table = 'user'
  
      def __str__(self):
          return self.username + str(self.uid)
      # 可以自定义
      objects = Manager()  # 系统管理器
      user_manager = Manager()  #自定义管理器
      sex_manager = MyManager()
  
      @classmethod
      def after(cls,date):
          return cls.user_manager.filter(regtime__gt=date)
  
      @classmethod
      def get_sexes(cls):
          return cls.objects.filter(sex__isnull=False)

• views.py

  ---

  from django.db.models import Count, Q
  from django.http import HttpResponse
  from django.shortcuts import render
  
  # Create your views here.
  from App.models import User
  
  def manage(request):
      # 使用自定义管理器查询
      # data = User.user_manager.all()
      # data = User.sex_manager.all()
      # print(data)
      # for user in data:
      #     print(user.sex)
  
      # 调用自己的类方法
      # data = User.after('2020-03-11')
      # print(data)
  
      # 调用管理器的方法sex_manager
      data = User.sex_manager.after('2020-03-11')
      print(data)
  
      return HttpResponse("自定义管理器")