Can I get handle to Database Row before an entity is deleted

Question

Hi,
We are using stored procedure to list, insert , update and delete entity objects.To use the stored procedure I override the default queries generated by Toplink and make use of the stored procedure query.The issue here is that my Stored Procedure requires more arguments (like name of the user doing the insert) than there are fields in the entity.I need to provide these argument values to the call.For this I do something like
session.getDescriptor(MyClass.class).getEventManager().addListener(new DescriptorEventAdapter(){
     public void aboutToInsert(DescriptorEvent evt) {
     evt.getRow().put("USER",evt.getSession().getProperty("username"));
I set the username in the unitOfWork out of which I can grab the value in the eventHandler and put it inside the row just before insert.I do the same for modify too.But I dont see a similar methods for "delete".Do we have a aboutToDelete() method where I can get a handle to the row.The preDelete() does not provide a handle to the row.How can I insert additional arg values to the delete query?
Thanks,
Harini

Answer 1

Hello Harini,
Wow, you are correct there is no aboutToDelete, I guess manipulating the row before deletetion is not that common for our TopLink clients as this is the first request I have heard for it. I will add this request to our enhancement database. You might want to follow it up with support if it is a priority for you.
As a workaround you could use the preDelete event to change the stored procedure call with the user name argument (i.e. build the procedure call dynamically in preDelete and set it into the query. The query will have been cloned at this point so there should be no concurrency issues. Make sure when doing this that you do not set the deleteQuery in the descriptor query manager as this will override the original query if set.
Example:
descriptor.getEventManager().addListener(new DescriptorEventAdapter() {
public void preDelete(DescriptorEvent event) {
StoredProcedureCall call = new StoredProcedureCall();
call.setProcedureName("Delete_proc");
call.addNamedArgument("P_ID", "ID");
call.addNamedArgumentValue("USER", "scott");
call.addNamedArgumentValue("TIME", new java.util.Date());
event.getQuery().setCall(call);
});