Dear All,

OK, might be some of you would find it an interesting topic.
I was consedering about a situation detailed below,

1. In normal db, we keep track for each table via masters, adding/having same named fields
like
create_author,
create_date,
update_author,
update_date,
update_counter

now, I was wondering about the tooling(automatic update).
Despite one could set() each of all fields in service class and do save(),
can it be possible to automate the process so that for every save()/update() operation above fields should get automatically updated and need not to do individualy for each db_table.

Any idea !!! please share your advice.

sure it's possible, when using JPA there are "Life Cycle Callback Methods", you could add a method on the entity itself to perform the changes you need, and annotate it like @PrePersist

Hi Sanne,

nice reply !!
but I think, this approach would be infeasible when functioning with hundreds of entities.
Needs code duplication, and would be intricate to distinguish between save() and update() operations. I mean, for save() all fields would be inserted, but for update() only update_author, update_date and update_counter and would be updated.

I presume to perform this job using an interceptor,
Just add once and should act upon each entity, also should judge save() and update() operations.

In there any way!!
--------------------
Ceezane

if it's the same logic you want to apply on many entities you could use an eventlistener, the're globally registered in Hibernate on the specific events you care for.
You might also be interested in Envers, the new plugin to enable auditing.

Hi,

that’s jingle nice.
could you please let some briefings on it,
It would be an immense for my auxiliary investigation.
Thanks !!

__________
ceezane

Sure;
there are different interfaces you can implement, depending on which event you want to listen to, like
PostDeleteEventListener, PostInsertEventListener, PostUpdateEventListener, ...
All of Hibernates internals are implemented by these events (like saving an entity is actually performed by such a listeners), and you can add more listeners and even replace de default ones.

http://fisheye.jboss.org/browse/Hibernate/search/trunk/src/main/java/org/hibernate/search/event/FullTextIndexEventListener.java?r=11631 is an example of a fairly complex listener, it's the one for Hibernate Search.

This can be enabled by code:
http://fisheye.jboss.org/browse/Hibernate/search/trunk/src/main/java/org/hibernate/search/event/EventListenerRegister.java?r=16306

or by XML configuration:
http://docs.jboss.org/hibernate/stable/search/reference/en/html_single/#d0e1210

just replace the classname with your own implementation; if you register them by code make sure to ADD your listeners to the array, not to replace the existing. Also remember the EventListener is shared across all Session(s), so. make sure it's threadsafe or stateless.

Thanks a lot,
I will do some touch and will post again, if needed. Thank you!!