How Can I Execute Raw SQL Queries in Django Views?

Executing Raw SQL Queries in Django Views

Django allows developers to perform raw SQL queries directly from views. This can be useful for performing complex operations or fetching data that is not easily accessible through Django's ORM.

Performing a Raw SQL Query

To perform a raw SQL query in Django, you can use the following steps:

1. Import the connection object from django.db.
2. Create a cursor object using cursor = connection.cursor().
3. Execute the SQL query using cursor.execute(query).
4. Fetch the results using row = cursor.fetchone().

Example

The following example demonstrates how to perform the given SQL query using Django's ORM and a raw SQL query:

from app.models import Picture
from django.db import connection

def results(request):
    # Using Django ORM
    all = Picture.objects.all()
    yes = Picture.objects.filter(vote='yes').count()
    
    # Using raw SQL
    cursor = connection.cursor()
    cursor.execute('''SELECT COUNT(*) FROM pictures''')
    row = cursor.fetchone()
    num_all = row[0]
    
    cursor.execute('''SELECT COUNT(*) FROM pictures WHERE vote = "yes"''')
    row = cursor.fetchone()
    num_yes = row[0]
    
    return render_to_response(
        'results.html', 
        {'picture':picture, 'num_all':num_all, 'num_yes':num_yes}, 
        context_instance=RequestContext(request)
    )

WHERE Clause for Filtering

To filter the results using the WHERE clause, simply include the WHERE clause in the SQL query. For example, to filter the vote for "yes":

cursor.execute('''SELECT COUNT(*) FROM pictures WHERE vote = "yes"''')

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