Database connectivity using Django

Database connectivity using Django:-

To manage database operation in Django  First We create a Database using SQLITE, It will be by default exists under the Django project.



SQLite is a lite weight database software which is the RDBMS (Relational database management system)  light-weight package which is mostly used in mobile applications but now it can be used in the web application, enterprise application, etc.



Django provides ORM (Object Relational Mapping) tools that are used to map the database table of SQLite in an application using objects.

ORM means Object-relational mapping that provides a set of classes to implement a set of tables.



Step for database Operation using DJANGO


1)  Create an app using python manage.py startup app-name


2)  Create Classes under models.py  according to a database table for example if we want to create a registration form using four different fields username, password, email, and mobileno then we create Register class and define all fields.


class Register(models.Model):

 emailid= models.CharField(max_length=200)

 password= models.CharField(max_length=200)

 mobile= models.CharField(max_length=200)

 fullname= models.CharField(max_length=200)


3) run command to migrate model class to the table schema

   3.1)  python manage.py migrate  #to enable all predefine app under settings.py INSTALLED_APPS Section.

  3.2)  python manage.py makemigrations appname  #it is used to enable the current app for migration, it will convert the model class to the table schema


 4) run command to sqlmigrate


4.1)   python manage.py sqlmigrate appname 0001  # it will convert table schema to SQL Script


   After the successful execution of this command, it will create a table SQL Script.


 5) 

      python manage.py migrate  #it will create table using SQL Script



 6)  If we want to show a table then we should go into the super admin dashboard, which will be by default exist under the Django framework. we should create user id and password only


 7) to login into  the super admin dashboard run the following command


     python manage.py createsuperuser  #it provides a console screen to write username and password to admin


 8) open admin dashboard using 127.0.0.1:8000/admin  server should be started


 9)  login with a valid username and password


 10) add a registration model class  of application to the admin dashboard


 11)  go into admin.py and write the following code



      from django.contrib import admin

      from .models import Register

      admin.site.register(Register)



12) refresh the admin dashboard your table will be visible


13) data will be shown on Object pattern we can Override __str__ method in the class and convert an object to String.



How to work with another database such as MySQL:-

1)  First, install mysqlclient in your machine.

    pip install django mysqlclient

2) go into base project and change the database list.

DATABASES = { 'default': { 'ENGINE': 'django.db.backends.mysql', 'NAME': 'databasename',

'USER': 'root'

'PASSWORD:''

'HOST': '127.0.0.l'

'PORT':'3306' } }

remaining command are the same 

python manage.py makemigrations
python manage.py migrate

 python manage.py sqlmigrate appname 0001 

python manage.py migrate