业务对象的版本控制

Question

Is there a recognised pattern that addresses being able to "version" business objects in a web application, persisted in a RDBMS?

As an example if an audit log from a web application read thus:

2011-08-20 14:05:00 User A added changed setting "A" of object "B" to "3" 
2011-08-20 14:04:00 User A added changed setting "B" of object "B" to "2"
2011-08-20 14:01:00 User A added changed setting "C" of object "B" to "1"

How would one architect a system to allow the user of the application to "roll back" the state of object "B" to that before 2011-08-20 14:01:00?

Answer 1

Take a look on Doctrine 1.2 Versionable behaviour.

Sad thing is that behaviors are discarded in Doctrine2. But there are a tutorial on how to implement it yourself.