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

Mon, 21 November 2011 18:24

James

Messages: 272
Registered: July 2009

Senior Member

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?
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James : http://wiki.eclipse.org/EclipseLink : http://en.wikibooks.org/wiki/Java_Persistence : http://java-persistence-performance.blogspot.com/

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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 09:59

J F

Messages: 256
Registered: July 2009

Senior Member

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.

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