Django_setting.md

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Django

How Django deal request?

1. User types the url and keypress, the request is created
2. The request will be sent to 'urls.py'
3. Django will match the url with urlpatterns data
4. If the match happend, Django will return the view.

#urls.py
    from app import views
    from django.urls import path
    urlpatterns = [
      path('index/', views.index, name='index'),
    ]

#views.py
def index(request):
    ...
    return render(request,'index.html')

Virtual Environment

What's Virtual Environment

• A Virtual Environment which can run python.The pip packages is installed in different environment won't disturb each others.

How to install Virtual Environment

• Create a random file
• create a Virtual Environment

python3 -m venv djangogirls_venv // 

• swithch to the Virtual Environment

source djangogirls_venv/bin/activate 

Run Django

• How Django connect to Database?
• Database setting in .env file

DB_CONNECTIONS=mysql
DB_HOST=XXX.XXX.X.XXX
DB_PORT=XXXX
DB_DATABASE=maltose-dev
DB_USERNAME=root
DB_PASSWORD=password

• Install package which project need

$ source djangogirls_venv/bin/activate 
$ pip install XXXX or
$ pip install -r `requirements/local.txt` 

• Run Server

$ python manage.py runserver

Connect to MySQL

---

Django介紹

Django 如何處理請求？

1. 用戶在敲下你的網址並回車，生成請求;
2. 請求傳遞到urls.py;
3. Django的去urlpatterns的中匹配鏈接（Django的會在匹配到的第一個就停下來）;
4. 一旦匹配成功，則Django便會給出相應的視圖頁面（該頁面可以為一個的Python的函數，或者基於視圖（Django的內置的）的類），也就是用戶看到的頁面;

#urls.py
    from app import views
    from django.urls import path
    urlpatterns = [
      path('index/', views.index, name='index'),
    ]

#views.py
def index(request):
    ...
    return render(request,'index.html')

虛擬環境

什麼是虛擬環境

• 一個可以 Run python 的虛擬環境，可以在裡面安裝各種套件，然後不同虛擬環境不會互相影響.

如何安裝虛擬環境

• 建造一個隨便的檔案
• 建造一個虛擬環境

python3 -m venv djangogirls_venv // 

• 切換虛擬環境

source djangogirls_venv/bin/activate 

啟用Django並連接資料庫

• 設定 .env 檔案

DB_CONNECTIONS=mysql
DB_HOST=XXX.XXX.X.XXX
DB_PORT=XXXX
DB_DATABASE=maltose-dev
DB_USERNAME=root
DB_PASSWORD=password

• 在虛擬環境中安裝套件

$ source djangogirls_venv/bin/activate 
$ pip install XXXX or
$ pip install -r `requirements/local.txt` 

• 啟用Django

$ python manage.py runserver

連接資料庫