Django Raw Sql Queries

Reading Time : ~ .

When your model query API don't go well or you want more performance, you can use raw SQL queries in Django. The Django Object Relational Mapper (ORM) helps bridge the gap between the database and our code Performing raw queries.

app/model.py

class employee(models.Model):

    name = models.CharField(max_length=20)

    position = models.CharField(max_length=20)

    sal = models.IntegerField()


Select statment:

  >>> emp_list=employee.objects.raw('select * FROM blogapp_employee')

SQL statement in .raw() return a set of rows from the database if not return rows, error will result.

  >>> for i in emp_list:

  ...    i.name

  ... 

  u'ravi'

  u'john'

  u'pheebi'

Above work same as model_name.objects.all().

MyModel.objects.all() is a very simplyfied ORM. This code will return the entire contents of the database table, same as running: select * from MyModel.

Only use .raw() method when you con't do task with which Django QuerySet.

Update, Delete With sql(Using cursor)

  >>>from django.db import connection, transaction

  >>>cursor = connection.cursor()

  >>>cursor.execute("UPDATE tablename SET field=value, .. WHERE .'condition'. ")

    >>>cursor.execute("DELETE tablename SET field=value, .. WHERE .'condition'. ")

 

To see What are the sql queries django running:

  >>> from django.db import connection
  >>> connection.queries
  [{'sql': 'SELECT * FROM blog_employee',
  'time': '0.001'}]

  #sql -- The raw SQL statement
 #time -- How long the statement took to execute, in seconds.


You can see django orm query equalent to sql qeury

  >>> q = employee.objects.all()

  >>> q

  []

  >>> print q.query

  SELECT "blogapp_employee"."id", "blogapp_employee"."name", "blogapp_employee"."position", "blogapp_employee"."sal" FROM "blogapp_employee"
    By Posted On
SENIOR DEVELOPER at MICROPYRAMID

Need any Help in your Project?Let's Talk

Latest Comments
Related Articles
Improving page speed score in Google Page Score test- PART2 Chaitanya Kattineni

In our previous blog post we got an idea of what are the things that Google's Page Speed Insights will take into count to give ...

Continue Reading...
Integrate Django-Oscar-Accounts with Django-Oscar Shirisha Gaddi

This package uses double-entry bookkeeping where every transaction is recorded twice (once for the source and once for the destination). This ensures the books always ...

Continue Reading...
How to create Periodic Tasks in Celery? Nikhila Mergu

Periodic Task is a scheduling task which will run at regular intervals of time. Celery is a powerful, production-ready asynchronous job queue, which allows you ...

Continue Reading...

Subscribe To our news letter

Subscribe to our news letter to receive latest blog posts into your inbox. Please fill your email address in the below form.
*We don't provide your email contact details to any third parties