djangoMTV初探

1.restful请求方式
一个视图对应多个操作（增删改查）

老的方式

views.py

from django.shortcuts import render
from django.http import HttpResponse,request,QueryDict, JsonResponse
from myapp.models import User
from django.views.generic import View
# Create your views here.
def user(request):
    if request.method == "GET":
        return HttpResponse("获取用户")
    elif request.method == "POST":
        name = request.POST.get('name')
        city = request.POST.get('city')
        sex = request.POST.get('sex')
        age = request.POST.get('age')
        User.objects.create(
            name=name,
            city=city,
            sex=sex,
            age=age
        )
        return HttpResponse("创建用户成功！")
    elif request.method == "PUT":
        data = QueryDict(request.body)
        id = data.get('id')
        user_obj = User.objects.get(id=id)
        user_obj.city = data.get('city')
        user_obj.sex = data.get('sex')
        user_obj.age = data.get('age')
        user_obj.save()
        # 方式2
        # data = {'city': data.get('city'), 'sex': data.get('sex'), 'age': data.get('age')}
        # User.objects.filter(id=id).update(**data)
        res = {'code': 200, 'msg': '更新成功！'}
        return JsonResponse(res)
    elif request.method == "DELETE":
        # request有GET和POST，没有DELETE和PUT
        data = QueryDict(request.body)
        id = data.get('id')
        try:
            User.objects.get(id=id).delete()
            res = {'code': 200, 'msg': '删除用户成功！'}
        except Exception:
            res = {'code': 500, 'msg': '删除用户失败！'}

        return JsonResponse(res)#返回的是json对象，httpresponse返回的是字符串

def user_edit(request):
    id = request.GET.get('id')
    user_obj = User.objects.get(id=id)
    return render(request, 'user_edit.html', {'id': id, 'user': user_obj})

def user_add(request):
    return render(request, 'user_add.html')

def user_list(request):
    user_list = User.objects.all()
    return render(request,'user_list.html',{'user_list': user_list})
# 上面是老式的api请求方式，
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user_list.html

    
    
    


创建用户

        {% for i in user_list %}
        
        {% endfor %}
    

    

        

            
ID
            
姓名
            
城市
            
性别
            
年龄
            
操作
        
    
    

            
{{ i.id }}
            
{{ i.name }}
            
{{ i.city }}
            
{{ i.sex }}
            
{{ i.age }}
            

                编辑
                删除
            
        





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user_edit.html

    
    
    


编辑用户

    
    姓名：

    城市：

    性别：

    年龄：

    




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user_add.html

    
    


创建用户

    姓名：

    城市：

    性别：

    年龄：

    



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myapp/urls.py

from django.contrib import admin
from django.urls import path,include
from myapp import views

urlpatterns = [
    path('user/',views.user),
    path('user_list/',views.user_list),
    path('user_add/',views.user_add),
    path('user_edit/', views.user_edit)
]
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上述是函数视图，if多分支的方式。

用django的类进行替换，类视图：

class UserView(View):
    def get(self, request):
        if request.GET.get('id'):
            pass
            # user_obj = User.objects.get(id=request.GET.get('id'))
            # res = {'code': 200, 'msg': '成功！', user_obj: user_obj}
            # return JsonResponse(res)
        else:
            user_list = User.objects.all()
            return render(request, 'user_list.html', {'user_list': user_list})

    def post(self, request):
        name = request.POST.get('name')
        city = request.POST.get('city')
        sex = request.POST.get('sex')
        age = request.POST.get('age')
        User.objects.create(
            name=name,
            city=city,
            sex=sex,
            age=age
        )
        return HttpResponse("创建用户成功！")

    def put(self, request):
        data = QueryDict(request.body)
        id = data.get('id')
        user_obj = User.objects.get(id=id)
        user_obj.city = data.get('city')
        user_obj.sex = data.get('sex')
        user_obj.age = data.get('age')
        user_obj.save()
        # 方式2
        # data = {'city': data.get('city'), 'sex': data.get('sex'), 'age': data.get('age')}
        # User.objects.filter(id=id).update(**data)
        res = {'code': 200, 'msg': '更新成功！'}
        return JsonResponse(res)

    def delete(self, request):
        data = QueryDict(request.body)
        id = data.get('id')
        try:
            User.objects.get(id=id).delete()
            res = {'code': 200, 'msg': '删除用户成功！'}
        except Exception:
            res = {'code': 500, 'msg': '删除用户失败！'}

        return JsonResponse(res)

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urls.py

from django.contrib import admin
from django.urls import path
from . import views

urlpatterns = [
    # path('user/', views.user),
    path('user/', views.UserView.as_view()),   #类视图用的url地址
    path('user_add', views.user_add),
    path('user_edit', views.user_edit)
]

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