• Install Django

  pip install django

• Check version on django

  python -m django --version

• Creating a project

django-admin startproject CreditApprovalSystem

• The development server

python3 manage.py runserver

• Changing the port

python3 manage.py runserver 8080

python3 manage.py runserver 0.0.0.0:8000

• Creating the System app

python3 manage.py startapp system

• Write our first view (system/views.py)

  from django.http import HttpResponse
  
  
  def index(request):
      return HttpResponse("Hello, world. You're at the system index.")
  

• In the system/urls.py file include the following code:

  from django.urls import path
  
  from . import views
  
  urlpatterns = [
    path("", views.index, name="index"),
   ]
  

• Add this to ProjectName/urls.py

  from django.contrib import admin
  from django.urls import include, path
  
  urlpatterns = [
      path("system/", include("system.urls")),
      path("admin/", admin.site.urls),
  ]
  

• Some of these applications make use of at least one database table, though, so we need to create the tables in the database before we can use them. To do that, run the following command:

python3  manage.py migrate

• Now working with models folder of system directory

  from django.db import models
  
  
  class Users(models.Model):
      userId = models.AutoField(primary_key=True)
      firstName = models.CharField(max_length=50)
      lastName = models.CharField(max_length=50)
      age = models.CharField(max_length=3)
      phoneNumber = models.CharField(max_length=10)
      monthlySalary = models.CharField(max_length=10)
      approvalLimit = models.CharField(max_length=10)
  

• In ProjectName/settings.py

  INSTALLED_APPS = [
      "system.apps.SystemConfig",
      'django.contrib.admin',
      'django.contrib.auth',
      'django.contrib.contenttypes',
      'django.contrib.sessions',
      'django.contrib.messages',
      'django.contrib.staticfiles',
  ]
  

• Now Creating Our Models Using Command

python3 manage.py makemigrations system

python3 manage.py sqlmigrate system 0001

BEGIN;
--
-- Create model Users
--
CREATE TABLE "system_users" ("userId" integer NOT NULL PRIMARY KEY AUTOINCREMENT, "firstName" varchar(50) NOT NULL, "lastName" varchar(50) NOT NULL, "phoneNumber" varchar(10) NOT NULL);
COMMIT;

• Deleting Existing table if got some error

  python3 manage.py dbshell
  
  sqlite> DROP TABLE system_users;
  
  sqlite> .exit
  

python3 manage.py createsuperuser