Sequence in Impl create() method + UIX

Question

I am populating a key from a database sequence from
the entity ???Impl create() method. It tests out OK from
the tester and any generated browse and edit forms except the UIXML. I can see it being called twice from a UIXML browse and edit form; once to create the row before the page is rendered and then again during the 'apply' event.
It ends up wasting every other sequence number. Any ideas on how to stop this?
* Add attribute defaulting logic in this method.
protected void create(AttributeList attributeList) {
super.create(attributeList);
SequenceImpl seq =
new SequenceImpl("REGION_SEQ", getDBTransaction());
Number sval = seq.getSequenceNumber();
setRegionId(sval);
System.out.println("create: sval " + sval);
}

Answer 1

I believe that the technique that is described by Steve Muench in that article leaves one problem area open. Using the DBSequence domain requires that a trigger be on the database to create the sequence number for the new record. If you need to know what that sequence number is immediately after it was created you will need to do some extra coding to identify it.
I am not sure what you mean that you would use doDML(). Can you explain further?
Still, the technique that uses create(), that is also published in the Oracle9i JDeveloper Handbook, should work. I believe that Oracle has recognized this as a bug and plans to have it fixed in the next release.