Mastering Flask Web Development - Second Edition

CRUD

In every storage mechanism for data, there are four basic types of functions: create, read, update, and delete (CRUD). These allow us to perform all the basic ways of manipulating and viewing the data that is needed for our web apps. To use these functions, we will use an object in the database named a session. Sessions will be explained later in the chapter, but for now, think of them as a storage location for all of our changes to the database.