Eclipse Community Forums: EclipseLink » Re: Descriptor Events on Entities which have not been modified during a Transaction

Home » Eclipse Projects » EclipseLink » Re: Descriptor Events on Entities which have not been modified during a Transaction

Re: Descriptor Events on Entities which have not been modified during a Transaction [message #758011]

Mon, 21 November 2011 13:24

Eclipse User

Why don't you use the @OrderColumn?

Or, can you maintain the index in your model, just update the index every time you add or remove from the collection, such as defining add/remove methods on your class.

For using events, why would you want events from objects that did not change?
--
James : http://wiki.eclipse.org/EclipseLink : http://en.wikibooks.org/wiki/Java_Persistence : http://java-persistence-performance.blogspot.com/

Re: Descriptor Events on Entities which have not been modified during a Transaction [message #758196 is a reply to message #758011]

Tue, 22 November 2011 04:59

Eclipse User

Thanks again James.

The reason for the example was to see whether there were any other techniques that could be used to manage a collection of objects which derived state from their position in a List. The reason for not doing this at the time of inserting/removing other items is just that it means doing it all the time, not on some final event. Before I rewrote this I wanted to make sure I was not missing something that I could get for free from Eclipselink, I wasn't sure from the docs whether the PreWrite event was available on all Entities or not.

Its not an issue and I can see the benefits/difficulties of calculating the changes once and not firing events on unchanged entities.

Previous Topic:	Descriptor Events on Entities which have not been modified during a Transaction
Next Topic:	not persisted values are lost when cloning

Goto Forum:

-=] Back to Top [=-

Current Time: Wed Jul 23 19:03:30 EDT 2025

.:: Contact :: Home ::.

Breadcrumbs

Sign up to our Newsletter