LIUPENG BLOG

django教程

Liupeng
Jun 27, 2020
It takes 9 minutes to read this article.

简介

Django是一个什么东西？

我现在没有搞明白！

建立一个Django项目

编译器

  • PyCharm

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Start

Create New Project

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Setting Project

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Over

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Run

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Effect

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File

Mainly introduce the role of file directory.

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asgi.py

条件限制，我没有详细了解过，If I learn to update it later.

setting.py

项目配置文件

  • 配置功能
  • 国际化配置（语言和时区）
  • 数据库配置

urls.py

路径配置文件

wigs.py

条件限制，我没有详细了解过，If I learn to update it later.

db.sqlite3

自动弹出的数据库，默认使用sqlite。

manage.py

条件限制，我没有详细了解过，If I learn to update it later.

Django Project cutover Databases

Databases

  • MySQL

How to Cutover Databases

update setting.py

path

yourProject/yourProject/settings.py

ordCode

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newCode

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tall Project your cutover databases

path

yourProject/yourProject/init.py

add code

import pymysql
pymysql.install_as_MySQLdb()

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Registered background administrator

Open Terminaal

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input command line code

python manage.py migrate

python manage.py createsuperuser

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Create App Or Function

Maybe you should know something about MVC or MVT

create file by django

input command line code

python manage.py startapp your_app_name

‘your_app_name’ as ‘card’:

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What is the role of the file?

__init__.py

不知道，🤷‍♂️！

admin.py

设置管理员对该功能的管理

apps.py

不知道，🤷‍♂️！

models.py

数据实体，与数据库交互（ORM）

test.py

测试

views.py

视图（返回数据还是页面）

配置路由

在你的yourproject/book/views.py中写一个方法

def sayHelloAt20200626(request):
    return HttpResponse("Hello World")

在urls.py中配置

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浏览器访问

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Communicate with database

Create Model

Path

yourProject/yourApp/models.py

Code

from django.db import models

# Create your models here.

# Book
class Book(models.Model):
    '''Book model class'''
    # 字符串
    # max_length ： 最大长度
    title = models.CharField(max_length=40)
    # pub date
    # date type
    pub_date = models.DateField()

    def __str__(self):
        return self.title

Create initial file

Open Terminal

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input command line code

python manage.py makemigrations

initial file ctrate table in databases

Open Terminal

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input command line code

python manage.py migrate

Databaes

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数据增删改查

Create

e = Entry()
e.name = "root"
e.save()

Select

e = Entry.objects.get(id=2)

Add

e.save()

Update

e.name = "newName"
e.save()

Show Data In Web Page

Create Html File

path

yourProject/templates/book/index.html

code

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Hello</title>
</head>
<body>
    <h1>
        Welcome! My friend!
    </h1>
    <hr>
    <ol>
        
    </ol>

</body>
</html>

create view function

path

yourProject/book/views.py

Code1

def indexPage(request):
    # 记载模板文件，生产模板对象
    template = loader.get_template('book/index.html')
    # 给定模板上下文，给模板文件传递数据
    context = {'numbers': list(range(1, 10))}
    # 模板渲染：产生标准的html文档
    res_html = template.render(context, request)
    # 返回
    return HttpResponse(res_html)

code2

def indexPage(request):
    return render(request, "book/index.html", {'numbers': list(range(1, 10))})

Setting Path or Url

App

path

yourProject/book/urls.py

code

from django.contrib import admin
from django.urls import path, include
from django.conf.urls import url
from book.views import sayHelloAt20200626
from book.views import indexPage
from book.views import showBooks
from book.views import bookDetail

urlpatterns = [
    url(r'^sayHelloAt20200626$', sayHelloAt20200626),
    url(r'^indexPage$', indexPage),
]

Project

path

yourProject/yourProject/urls.py

code

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

Web Page

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