Formatter and Handler Database - Writing and reading entity changes Overview

• Writing changes to database and read changes from database

• The EntityLog entity class

Writing changes to database and read changes from database

Please note that this chapter is only useful for you if you used the DatabaseHandler.

The EntityLog entity class

Changes made to an entity are represented in the EntityLog entity. A ready-to-use entity is available with \Watcher\Entity\EntityLog. Keep in mind that this class only provides basic usage fields (as described with the table schema as seen in Introduction: Requirements and Installation)

The EntityLog provides methods to get information about

• Which field was changed?
• What was the old value?
• What is the new value?
• When was it changed?

A common use-case is to display all changes made to an specific entity. There are two ways to get EntityLogs for a given entity.