Django—模型—增删改

• 增删改

  ---

  # models.py
  from django.db import models
  
  # Create your models here.
  # 自定义模型必须继承Model
  class User(models.Model):
      # 字段名：不能是python的关键字；不能使用连续的下划线;
      #db_column:数据库表中的字段名称
      uid = models.AutoField(primary_key=True)
      # CharField类型必须指明长度max_length
      username = models.CharField(max_length=30,unique=True)
      password = models.CharField(max_length=128)
      regtime = models.DateTimeField(auto_now_add=True)
  
      class Meta: # 元数据,模型本身的信息
          #默认表名：应用名_模型名
          db_table = 'user'  # 表名
          ordering = ['username']  # 排序
  
  
  

  # views.py
  from random import randint
  
  from django.http import HttpResponse
  from django.shortcuts import render
  
  # Create your views here.
  from App.models import User
  
  
  def handle_data(request):
      # 增加记录
      # user = User(username='tom',password='123')
      # user.save()
      # 便利方法
      # user = {'username':'tom1','password':'33334'}
      # User.objects.create(**user)
  
      # 批量创建
      # first = ["张","李","赵","周","吴","郑","王"]
      # lastname = ['三','春花','翠花','卫国','二狗']
      # users = []
      # for name in range(100):
      #     username = first[randint(0,6)] + lastname[randint(0,4)]+str(randint(0,10000))
      #     users.append(User(username=username,password=str(randint(11111,999999))))
      # User.objects.bulk_create(users)
      # User.objects.bulk_create([User(username='test1'),User(username='test2')])
  
  
      #修改
      # user = User.objects.get(pk=1)
      # user.password = '3333'
      # user.save()
  
      #删除
      # pk表示主键
      # try:
      #     user = User.objects.get(uid=1)
      #     print(user,type(user))
      #     if user:
      #         user.delete()
      # except Exception as e:
      #     print(e)
      #删除多条记录
      # users = User.objects.filter(uid__gte=2)
      # print(users)
      # users.delete()
  
  
      return HttpResponse("增删改")
  
  
  def find_data(request):
      # all 过滤器 查询所有数据
      # users = User.objects.all()
      # print(data)
  
      #filter 过滤器  where
      # select * from user where uid=5
      # users = User.objects.filter(uid=5)
      # select * from user where uid>5
      # 过滤器可以串联调用
      users = User.objects.filter(uid__gt=5).filter(uid__lt=50)
      print(users)
      # return HttpResponse("query")
      return render(request,'list.html',locals())

  # urls.py
  
  from django.urls import path, include
  
  from App import views
  
  urlpatterns = [
      # 数据的增、删、改
      path('',views.handle_data, name='data'),
      path('query/',views.find_data, name='find'),
  ]