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From Vic Cekvenich <>
Subject Re: OT: Strategy for out of date items through forms using hibernate?
Date Wed, 17 Dec 2003 19:07:44 GMT
I avoid timestamps.

Just make your where class = to the selct cluase.
In case any colum is changed, it fails.

(if you really need this)


David Erickson wrote:

> Hi I am using Struts with Hibernate in a webapplication.. we are using forms
> etc. The problem I am currently trying to decide how to handle is thus:
> Assume user 1 loads up an object in a form and is modifying it.
> Assume user 2 loads up the same object in a form and is also modifying it.
> User 1 submits the modified object.
> User 2 also submits the object, however his is out of date and I would like
> the webapp to tell him that and show the differences that exist.
> What is the best way to use hibernate to deal with this? What I have
> attempted is using the built in timestamp feature in MySQL, I have a field
> in my object that is timestamp but does not insert or update, thus mysql
> controls its value. Then when the user submits the object I loaded another
> copy of that object from the DB and tried to compare their dates.. however
> this gave me an error saying:
> net.sf.hibernate.NonUniqueObjectException: a different object with the same
> identifier value was already associated with the session: 1, of class:
> cmcflex.salesweb.model.prospect.Prospect
> because of the object I loaded to compare.
> What do do? Is there a better strategy for tackling this? I tried using the
> actual <timestamp> in the properties for my object, but then when I tried to
> submit the object the generated sql said "when id=? AND timestamp=?" meaning
> it would not update if the timestamp is different, and I'm unsure if I could
> even determine if it did or did not update.
> Thanks in advance,
> David

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