Intro to Object-Relational Mapping
Notes
ORM (object-relational mapping) is a technique for storing, retrieving, updating, and deleting in an object-oriented program using a relational database.
A data layer is typically a library written in the OO language that is part of, or works in conjunction with, your web framework. It is used to manage translations between the OO and relational worlds.
CRUD stands for Create, Read, Update, Delete and is the acronym used to describe the most common database tasks.