Basics of Django Database Connectivity

Django is a web framework that comes with an in-built ORM (Object-Relational Mapping) that provides an easier way to handle databases. This allows us to perform various SQL operations without having to write the SQL query explicitly.

Syntax

Below is the syntax for database connectivity in Django:

import django
django.setup()

from app_name.models import Model_Name

Example

Suppose we have a model named "Employee" in our app "myApp". Below is the code that fetches all employee records from the database and stores them in a variable called "all_employees".

import django
django.setup()

from myApp.models import Employee

all_employees = Employee.objects.all()

Output

The output of the above code will be a QuerySet that contains all the records in the "Employee" model.

Explanation

In the above example, we first import Django and set it up using the django.setup() function. This is required for accessing the models in our app. We then import the "Employee" model from our app using from myApp.models import Employee.

To retrieve all the records from the "Employee" model, we use the objects.all() function. This function returns a QuerySet that contains all the records in the "Employee" model.

Use

Database connectivity is essential for retrieving data from the database in a web application. It enables us to easily interact with the database without having to write the SQL queries explicitly.

Important Points

• To connect to the database, Django provides an ORM that abstracts the SQL database layer.
• The django.setup() function is used for setting up the Django environment for accessing models in the app.
• The models.ModelName.objects.all() function is used for retrieving all the records from a model in the app.

Summary

In this article, we've discussed the basics of Django database connectivity. We've looked at the syntax and example of performing database connectivity in Django. We've also discussed important points and use cases of this functionality.