Learn to use the front page to show Django2

Django 2.1 python 3.7

Create a virtual environment

python -m venv virtual environment name

Enter the virtual environment

Download django

pip install django==2.1

1  Create a project:
 2  
3 Django-ADMIN startproject project name -> Create a project has a point
 4  
5  to create applications:
 6 Python manage.py create applications startapp

A clean Django framework, we need to open the settings.py set

Step 1: Create a database: MyDB mysql command See related article: https://www.cnblogs.com/whatarey/p/11396616.html

Step two: settings.py background Django application settings Chinese, modify the configuration database to mysql

. 1 DATABASES = {
 2      ' default ' : {
 . 3          ' ENGINE ' : ' django.db.backends.mysql ' ,
 . 4          ' NAME ' : 'MyDB ' , # database name, 
. 5          ' the USER ' : ' the root ' , # database login username 
6          ' pASSWORD ' : ' 123456 ' , # database password 
7          'HOST': ' Localhost ' , # host database resides 
. 8          ' PORT ' : ' 3306 ' , # database port 
. 9      }
 10  }
 . 11  
12 is  
13 is  
14 LANGUAGE_CODE = ' ZH-Hans '

INSTALLED_APPS = [

'django.contrib.admin',

'django.contrib.auth',

'django.contrib.contenttypes',

'django.contrib.sessions',

'django.contrib.messages',

'django.contrib.staticfiles',

'Web' - plus project name

]

Step 3: Create the model:

1  class   UserInfo (models.Model):
 2      UserName = models.CharField (max_length = 20) # username 
3      create_date = models.DateField () # Creation Date 
4      pwd = models.CharField (max_length = 20) # password 
5

The fourth step, the background admin.py registration

from .models  import  UserInfo
 
admin.site.register(UserInfo)

The fifth step to perform file migration

 

python manage.py makemigrations
python manage.py migrate

At this time, certain that a mistake will occur:

Join in the project init.py in:

import pymysql
pymysql.install_as_MySQLdb()

Running on it

run:

Into the background, suddenly found not to create background administrator account ....

Create an administrator account:
Python manage.py createsuperuser

This password is too pit. . . .

Step Six: Add to views.py project

 1 from django.shortcuts import render
 2 from django.http  import  HttpResponse,Http404
 3 from django.template import loader 
 4 #这里是视图
 5 
 6 def  index(request):
 7     '''写法1'''
 8     # template=loader.get_template('Web_Templates/index.html')
 9     # # 2.定义上下文
10     # context={"title":"Index","heatde_title":"Index","BodyHtml":"这是我的主页内容<a href=''>hehe</a>"} # 这个上下文是一个字典，它将模板内的变量映射为 Python 对象。
11     # return HttpResponse(template.render(context,request))
12 
13     '''写法2'''
14     data={
15 "title":"Index",
16 "heatde_title":"Index",
17 "BodyHtml":"中间body",
18 "id":[1,2,3,4,5]
19     }
20     context = data
21     return render(request, 'Web_Templates/index.html', context)
22     # 注意到，我们不再需要导入 loader 和 HttpResponse 。
23     # 不过如果你还有其他函数（比如说 detail, results, 和 vote ）需要用到它的话，就需要保持 HttpResponse 的导入。
24 
25 
26 def  getHtml(request,id):
27     list=[0,1,3,4]
28     try:
29         question =list[id] 
30     except  Exception as e:
31         raise Http404("Question does not exist")
32     return render(request, 'Web_Templates/Show.html', {'question': question})

第七步：项目中添加urls.py

 1 from  django.urls import path
 2 
 3 from . import views
 4 
 5 app_name="Web"
 6 urlpatterns=[
 7       #url(r'^$'
 8     path("",views.index,name="Index"),
 9     path("Show/<int:id>/",views.getHtml,name="Show"),
10 # '''
11 #     #   # ex: /polls/
12 #     # path('', views.index, name='index'),
13 #     # # ex: /polls/5/
14 #     # path('<int:question_id>/', views.detail, name='detail'),
15 #     # # ex: /polls/5/results/
16 #     # path('<int:question_id>/results/', views.results, name='results'),
17 #     # # ex: /polls/5/vote/
18 #     # path('<int:question_id>/vote/', views.vote, name='vote'),
19 # '''
20 ]

第八步，应用的urls.py 注册

from django.urls import path,include 导入 include

urlpatterns = [

path('admin/', admin.site.urls),

# url(r'^$', views.index),

path('',include('Web.urls')) # 导入你app 自己创建的urls

]

第九步：创建模板我是在 MyWeb\

第十步，把模板路径添加到项目的settings.py

 1 TEMPLATES = [
 2     {
 3         'BACKEND': 'django.template.backends.django.DjangoTemplates',
 4         'DIRS': [os.path.join(BASE_DIR, 'Templates')],   # 模板'DIRS': [os.path.join(BASE_DIR, 'templates')],
 5         'APP_DIRS': True,
 6         'OPTIONS': {
 7             'context_processors': [
 8                 'django.template.context_processors.debug',
 9                 'django.template.context_processors.request',
10                 'django.contrib.auth.context_processors.auth',
11                 'django.contrib.messages.context_processors.messages',
12             ],
13         },
14     },
15 ]

 index.html
 1 <html>
 2 <head>
 3     <title>{{title}}</title>
 4 </head>
 5 <body>
 6 <h1>{{heatde_title}}</h1>
 7 <div>
 8 {{BodyHtml}}
 9 
10 {% for a_link_id  in id  %}
11   
12 <li><a href="{% url  'Web:Show' a_link_id  %}" >点我有惊喜，我的编号是：{{a_link_id}}</a></li> 
13 {% endfor %}
14 </div>
15 </body>
16 </html>

 show.html
 1 <html>
 2 <head>
 3     <title>111111</title>
 4 </head>
 5 <body>
 6 <h1>{{question}}</h1>
 7 <div>
 8 {{question}}
 9 
10 </div>
11 </body>
12 </html>

可看官网：https://docs.djangoproject.com/zh-hans/2.1/intro/tutorial03/

当id 超过了list的最大值，就会404

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Learn to use the front page to show Django2

Django 2.1 python 3.7

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