Stop duplicate sequence with exception

Question

I created a table that uses two sequences. I recently discovered that some of these sequence values being generated were either skipped or duplicated when added to the table.
At first I did not know why the sequence values in the table were being skipped or duplicated luckily I found an article, http://www.arikaplan.com/oracle/ari82599.html. I have now made the correct changes to diminish this effect.
So my goal right now is to figure out how to insert the skipped sequence back into my table whenever a new row is created without adding duplicate sequence for the "id" column.
This is what I have so far:
create sequence global_key INCREMENT BY 1 START WITH 1 MINVALUE 0
NOCYCLE nocache;
create sequence global_ids INCREMENT BY 1 START WITH 1 MINVALUE 0
NOCYCLE nocache;
create table ids (
key varchar2(100) primary key,
id number(20)
CREATE OR REPLACE TRIGGER global_key_trigger
BEFORE INSERT
ON ids
REFERENCING NEW AS NEW OLD AS OLD
FOR EACH ROW
begin
select global_key.NEXTVAL into :new.key from dual;
end;
declare
res number(20);
begin
select global_ids.nextval into res from dual;
     select id into res
from ids
where id = res ;
end;
     exception
     when no_data_found then return res -- ??;
     when DUP_VAL_ON_INDEX then -- continue loop ??
end;
Thank you
Edited by: user534236 on Apr 9, 2009 7:29 AM
Edited by: user534236 on Apr 9, 2009 7:32 AM
Edited by: user534236 on Apr 9, 2009 7:32 AM

Answer 1

It doenst look like there is an ODP.NET question in there, so your question may be better answered in the [SQL and PLSQL forum|http://forums.oracle.com/forums/forum.jspa?forumID=75]
Greg