Introductory Django

What is three tier Architecture?

Django takes position in three tier architecture. It is recommended to run the django project in virtual environment. One may choose to use venv, conda anything that he is familiar with. To run and view the django app on browser run the following:

python3 manage.py startapp demoapp # To create an app
python3 manage.py runserver # To run the server
python3 manage.py makemigrations # To compile the migrations
python3 manage.py migrate # To migrate the changes in Database

A Django project is a Python package containing the database configuration used by various sub-modules (Django calls them apps) and other Django-specific settings.

Use the startproject command of Django-admin as follows:

django-admin startproject demoproject

The startproject is Django’s default project template. It creates the following file structure in the Python environment:

C:\djenv\demoproject
│ manage.py
│
└───demoproject
asgi.py
settings.py
urls.py
wsgi.py
__init__.py

The general usage of manage.py is as follows: 

python manage.py <command>

On the top we used 3 command. Here are the explanation of these commands:

startapp

A Django project folder can contain one or more apps. An app is also represented by a folder of a specific file system. The command to create an app is: 

python manage.py startapp <name of app>

makemigrations

Django manages the database operations with the ORM technique. Migration refers to generating a database table whose structure matches the data model declared in the app.

The following command should be run whenever a new model is declared.

python manage.py makemigrations

migrate

This command option of manage.py synchronises the database state with the currently declared models and migrations.

python manage.py migrate

runserver

This command runs the sever

python manage.py runserver