python Django如何实现增删改查

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1.先创建个app子级

python .\manage.py startapp app01

然后创建数据模型

app01下的
modules.py文件

from django.db import models# Create your models here.class UserInfo(models.Model):    name=models.CharField(max_length=32)    password=models.CharField(max_length=12)    age=models.IntegerField()    tel=models.IntegerField(max_length=11)

配置数据库

'default': {        'ENGINE': 'django.db.backends.mysql',        'NAME': '数据库名',        'USER': '数据库用户名',        'PASSWORD': '密码',        'HOST': '127.0.0.1',        'PORT': '3306',    }

2.迁移数据库

python manage.py makemigrations 和 python manage.py migrate

3.写路由url

from django.contrib import adminfrom django.urls import path,includefrom app01 import viewsurlpatterns = [    # path('admin/', admin.site.urls),    # path('index/',views.index),    # path('user/list/', views.user_list),    # path('login/', views.ApiLogin.as_view()),    # path('del/', views.ApiDel.as_view()),    path('add/', views.addUser.as_view()),    path('user/', views.UserList.as_view()),    path('updateuser/', views.upDateUser.as_view()),    path('del/', views.deluser.as_view()),]

4.view页面编写增删改查

from django.shortcuts import render,HttpResponsefrom rest_framework.views import APIView# Create your views here.from django import viewsfrom app01.models import UserInfofrom rest_framework.response import Responsefrom app01.ser import APIViewUserInfoclass addUser(APIView):    def post(self,request):        obj=APIViewUserInfo(data=request.data)        if obj.is_valid():            obj.save()            return Response({"data":obj.data, "status" : 201,"message":"添加用户成功"})        return Response(data=obj.errors,status=400)class UserList(APIView):    def get(self,request):        obj=UserInfo.objects.all()        ser=APIViewUserInfo(instance=obj,many=True)        return Response(ser.data)class upDateUser(APIView):    def post(self,request):        print(request.data.get('id'))        i=request.data.get('id')        try:            user=UserInfo.objects.get(id=i)        except Exception as e:            return Response(data='不存在', status=201)        # 创建序列化对象，并将要反序列化的数据传递给data构造参数，进而进行验证        user.password=request.data.get('password')        if request.data.get('name')!='':            print(request.data.get('name')=='')            user.name=request.data.get('name')        user.save()        return Response(status=400)class deluser(APIView):    def post(self,request):        id=request.data.get('id')        UserInfo.objects.filter(id=id).delete()        return Response({"msg":'删除成功',"state":"true"})# def index(request):#     return HttpResponse("欢迎使用")### def user_list(request):#     return render(request,"user_list.html")## class ApiLogin(APIView):#     def get(self,request):#         return HttpResponse('get')#     def post(self,request):#         UserInfo.objects.create(name='张三',password='123456',age=15,tel='1234567891')#         obj=UserInfo.objects.all()#         print(obj)#         return HttpResponse('post')## class ApiDel(APIView):#     def post(self,request):#         UserInfo.objects.filter(id=4).delete()#         return HttpResponse('删除成功')

5.序列化 反序列化

# -*- coding: utf-8 -*-from rest_framework import serializersfrom app01.models import UserInfoclass APIViewUserInfo(serializers.Serializer):    """图书数据序列化器"""    id = serializers.IntegerField(label='ID', read_only=True)       # 主键序列化    # 第一：普通字段序列化    name = serializers.CharField(label='名称', max_length=20)    password = serializers.CharField(label='密码')    age = serializers.IntegerField(label='年龄', required=False)    tel = serializers.IntegerField(label='电话', required=False)    # # 第二：一对多字段序列化    # heroinfo_set = serializers.PrimaryKeyRelatedField(read_only=True, many=True)    # # 第三：自定义显示（显示多对多）    # xxx = serializers.SerializerMethodField(read_only=True)    class Meta:        model = UserInfo    # 自定义显示 多对多 字段 # 定义创建语法：ser.save()执行，就会立刻调用create方法用来创建数据    def create(self, validated_data):        '''validated_data: 表单或者vue请求携带的json：{"username":"zhangsan","password":"123456"}'''        return self.Meta.model.objects.create(**validated_data)

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