Django: Web Development with Python

Chapter 6. Getting a Model's Data with Querysets

Querysets are used for data retrieval rather than for constructing SQL queries directly. They are part of the ORM used by Django. An ORM is used to link the view and controller by a layer of abstraction. In this way, the developer uses object model types without the need to write a SQL query. We will use querysets to retrieve the data we have stored in the database through models. These four operations are often summarized by CRUD (Create, Read, Update, and Delete).

The discussed examples in this chapter are intended to show you how the querysets work. The next chapter will show you how to use forms, and thus, how to save data sent from a client in the models.

By the end of this chapter, we will ...