How we can check Item UNIQUE value at the time enter the value

Question

hi,
check unique item value.When entering value.
using record group.
How?
which trigger we can use?
Thanks & Records
venkat

Answer 1

Hi!
Do you want to check if a value already in your table?
if so, use the when-validate-item trigger like this:
begin
if
  :your_block.your_item is null
then
  return;  --> nothing to check, exit trigger
end if;
for l_rec in ( select 1
                  from your_table t
                  where t.your_column = :your_block.your_item
                  and ( :your_block.rowid is null OR rowid != :your_block.rowid )  --> if it is not a queried record
                  and rownum = 1 ) loop
  message ( 'The value ' || :your_block.your_item || ' is already in existence. Please enter another value or use our nice list-of-values.' );
  message ( ' ' );  --> shows an alert not only a message in the status line
  raise form_trigger_failure;
end loop;
end;Regards