新增出版社

前端页面

publisher_edit.html文件的代码如下：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <form action="" method="post">

        出版社名称: <input type="text" name="pub_name" value="{{ pub_obj.name }}"> <span>{{ msg }}</span>
        <button>提交</button>
    </form>
</body>
</html>

publisher_list.html文件内容如下：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<a href="/publisher_add/">新增出版社</a>
<table border="1">
    <thead>
        <tr>
            <th>序号</th>
            <th>id</th>
            <th>出版社名称</th>
            <th>操作1</th>
            <th>操作2</th>
        </tr>
    </thead>
    <tbody>
        {% for i in publisher_list %}   <!-- for循环来显示出版社 -->
            <tr>
                <td>{{ forloop.counter }}</td>  <!-- 循环计数 -->
                <td>{{ i.id }}</td>     <!-- 取出id -->
                <td>{{ i.name }}</td>   <!-- 取出出版社名字 -->
                <td><a href="/publisher_edit/?id={{ i.id }}">编辑</a></td>
                <td><a href="/publisher_del/?id={{ i.id }}">删除</a></td>
            </tr>
        {% endfor %}        <!--  结束for循环  -->

    </tbody>
</table>
</body>
</html>

后端实现

from django.shortcuts import render, redirect
from app01 import models


# Create your views here.


def publisher_list(request):
    obj = models.Publisher.objects.all()  # 获取所有对象
    return render(request, 'publisher_list.html', {'publisher_list': obj})  # {'publisher_list': obj}是模板，可以传递给前端页面。


def publisher_add(request):
    if request.method == "POST":  # 如果是POST请求
        pub_name = request.POST.get('pub_name')  # 获取出版社的名称
        if not pub_name:
            return render(request, 'publisher_add.html', {'error': "出版社名字不能为空"})
        if models.Publisher.objects.filter(name=pub_name):
            return render(request, 'publisher_add.html', {'error': "出版社已经存在"})
        models.Publisher.objects.create(name=pub_name)  # 增加出版社，使用create方法
        return redirect('/publisher_list/')  # 增加完成以后，跳转到获取所有出版社页面
    return render(request, 'publisher_add.html')  # 默认返回增加页面。


def publisher_del(request):
    pk = request.GET.get('id')  # 获取URL中id字段的值
    models.Publisher.objects.filter(id=pk).delete()    # 删除数据库中的数据
    return redirect('/publisher_list/')     # 重定向页面。


def publisher_edit(request):
    id = request.GET.get('id')
    obj1 = models.Publisher.objects.get(id=id)
    if request.method == "GET":
        return render(request, 'publisher_edit.html', {'pub_obj': obj1})
    else:
        name = request.POST.get('pub_name')
        obj2 = models.Publisher.objects.filter(name=name)
        if obj2:
            return render(request, 'publisher_edit.html', {'msg': "该出版社已存在"})
        else:
            obj1.name = name    # 在内存中修改
            obj1.save()         # 将修改保存到数据库
            return redirect('/publisher_list')  # 重定向到list页面

urls.py设置路由

"""bookmanager URL Configuration

The `urlpatterns` list routes URLs to views. For more information please see:
    https://docs.djangoproject.com/en/3.1/topics/http/urls/
Examples:
Function views
    1. Add an import:  from my_app import views
    2. Add a URL to urlpatterns:  path('', views.home, name='home')
Class-based views
    1. Add an import:  from other_app.views import Home
    2. Add a URL to urlpatterns:  path('', Home.as_view(), name='home')
Including another URLconf
    1. Import the include() function: from django.urls import include, path
    2. Add a URL to urlpatterns:  path('blog/', include('blog.urls'))
"""
from django.contrib import admin
from django.urls import path
from app01 import views
urlpatterns = [
    path('admin/', admin.site.urls),
    path('publisher_list/', views.publisher_list),
    path('publisher_add/', views.publisher_add),
    path('publisher_del/', views.publisher_del),
    path('publisher_edit/', views.publisher_edit),
]

效果如下所示：