Rob Hills wrote:
Hi Matt,
On 18 Dec 2007 at 9:25, Matt Raible wrote:
I believe these annotations only works when you're using JPA.
I think you're right. I had thought that Annotations like @EntityListeners, @PrePersist, @PreUpdate etc should work when I found
them amongst Hibernate API documentation in places like this:
http://www.hibernate.org/hib_docs/ejb3-api/index.html?javax/persistence/PrePersist.html, but I've sinced worked out that this
docco is for Hibernate's EntityManager which is all about EJB3 and I guess that because my project is a basic Struts one, I'm not
using EJBs and these elements of Hibernate functionality is therefore not available to me. Unfortunately, although I tried to keep
my project as pure "JPA" as I could, I've ended up becoming dependent on a number of Hibernate extensions so I think it will now
be too hard to switch over, but I'll take a look at that.
Leaving aside my application code, how difficult is it to switch a basic AppFuse 2.0 + Struts2 + Hibernate app over to Struts2 +
JPA? Is it just a matter of tweaking something in the pom.xml?
Actually, ignore that question, I see it's quite well documented in the
tutorial:
http://www.appfuse.org/display/APF/Using+JPA
On 12/18/07, Rob Hills <[EMAIL PROTECTED]> wrote:
Hi Again,
I spoke too soon on this one. I thought the timestamping was working, but then
discovered it was being done by
some code I'd put into a base dao a little while back. AFAICT, the
@EntityListeners and @PrePersist annotations
seem to be totally ignored by the version of Hibernate in AppFuse 2.0, which is
a real shame as they promise very
useful functionality.
On 17 Dec 2007 at 23:55, Rob Hills wrote:
WooHoo! I found a JPA/Hibernate "Event Listener" solution for this, and it's
really easy. As is often the way, I stumbled across it while looking for
something else.
I found the solution here:
http://www.theserverside.com/tt/articles/article.tss?l=JPAObjectModel
Although the article has an unlikely-looking title, search for the string
"@EntityListeners" and you'll find the first of three code examples showing
how to add auditing for Created date/time, Updated date/time and the user
making the changes. The keys are the JPA @EntityListeners and
@PrePersist JPA tags (also supported by Hibernate. It took me less than 5
minutes to get it all working (though I already had a base class for all my
entities and it already had a lastUpdated attribute, so that made it easier).
On 14 Dec 2007 at 9:54, Rob Hills wrote:
Matt Raible wrote:
Have you thought about doing this with a trigger in your database? Do
you need to record the user's information along with this auditing?
I've done this with Event Listeners in the past.
I'd be quite comfortable with doing it as a trigger, but for
"political" reasons that could be a bit tricky (though not impossible).
I just thought that because it's such a common pattern, Hibernate would
have a solution for it, but I guess it doesn't.
I've not played with event listeners yet, in general terms what event
would you hang one onto to do this kind of thing. WRT recording users
information, there's nothing in the spec about that, but from what I
know of the client, I can see that requirement arising sooner or later.
On 12/13/07, Rob Hills <[EMAIL PROTECTED]> wrote:
Hi All,
I'm using AppFuse 2.0 + Struts2 + Hibernate.
I need to timestamp all of my persisted data.
I have a base model class that includes a "lastUpdated" attribute and I
was hoping to be able to annotate it with something that would tell
Hibernate to timestamp it whenever it was saved to the DB, much as you
would do with an "After Update" trigger.
I've been hunting through the Hibernate documentation to see if it has
any "automatic" way of doing this, but haven't turned up anything
obvious. Hibernate has an @Temporal annotation, but AFAICT, it simply
provides a direction about the persisted datatype.
Is there any way to "automate" this or will I have to do it myself in
the DAO? If I have to do it myself in the DAO, I assume the most
efficient way will be to have a base DAO class that sits between
GenericDao and my own Dao's and have it do the timestamping
Hope this helps someone else one day.
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