django操作数据库增删改查

1、django初始化配置
https://blog.51cto.com/yht1990/2382898

2、创建模型
D:\mysite\polls\models.py

from django.db import models
class Publisher(models.Model):
    id = models.AutoField(primary_key=True)  # 自增的ID主键
    name = models.CharField(max_length=64, null=False)

3、建表

python manage.py makemigrations
python manage.py migrate

4、url配置
主项目url
D:\mysite\mysite\urls.py

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

urlpatterns = [
    path('polls/',include('polls.urls')),
    path('admin/', admin.site.urls),
]

应用项目url
D:\mysite\polls\urls.py

from django.urls import path

from . import views
 #添加命名空间
app_name = 'polls'
urlpatterns = [

    #访问列表页
    path('publisher_list/', views.published_list,name='published_list'),
        #添加数据
    path('add_publisher/', views.add_publisher,name='add_publisher'),

    #path('delete_publisher/', views.delete_publisher,name='delete_publisher'),
    #path('edit_publisher/', views.edit_publisher,name='edit_publisher'),
]

五、静态html
列表页
D:\mysite\polls\templates\polls\publisher_list.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>出版社列表</title>
</head>
<body>

<a href="/polls/add_publisher/">添加新的出版社</a>

<table border="1">
    <thead>
        <tr>
            <th>序号</th>
            <th>ID</th>
            <th>出版社名称</th>
            <th>操作</th>
        </tr>
    </thead>
    <tbody>
        {% for publisher in publisher_list %}
            <tr>
                <td>{{ forloop.counter }}</td>
                <td>{{ publisher.id }}</td>
                <td>{{ publisher.name }}</td>
                <td>
                    <a  href="/delete_publisher/?id={{ publisher.id }}">删除</a>
                    <a href="/edit_publisher/?id={{ publisher.id }}">编辑</a>
                </td>
            </tr>
        {% endfor %}
    </tbody>
</table>

</body>
</html>

#数据库增
D:\mysite\polls\templates\polls\add_publisher.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>添加出版社</title>
</head>
<body>

<h1>添加出版社</h1>
<!--url指提交的数据交给add_publisher函数处理，
polls为命名空间名字，绑定了add_publisher函数，指执行polls应用下的add_publisher函数
-->
<form action="{% url 'polls:add_publisher' %}" method="post">
    {% csrf_token %}
    <input type="text" name="publisher_name">
    <input type="submit" value="提交">
    <p style="color: red">{{ error }}</p>
</form>

</body>
</html>

python后端

D:\mysite\polls\views.py
from django.shortcuts import HttpResponse, render, redirect
#from polls import models
from .models import Publisher

列表页
def published_list(request):
    ret = Publisher.objects.all().order_by("id")
    return render(request,"polls/publisher_list.html",{"publisher_list": ret})

#添加新的出版社
def add_publisher(request):
    error_msg = ""

        #如果是POST请求,我就取到用户填写的数据
    print(request.method)
    if request.method == "POST":
        new_name = request.POST.get("publisher_name", None)
        if new_name:
            # 通过ORM去数据库里新建一条记录
            Publisher.objects.create(name=new_name)
           #返回访问列表面，退出
            return redirect("/polls/publisher_list/")
        else:
                    #如果用户post后没有数据则设置变量
            error_msg = "出版社名字不能为空!"
     #如果是get请求访问此页面
    return render(request, "polls/add_publisher.html", {"error": error_msg})

访问列表页
http://127.0.0.1:8000/polls/publisher_list/
访问添加页
http://127.0.0.1:8000/polls/add_publisher/

django操作数据库增删改查

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