At 02:28 PM 20/10/2004 +0100, you wrote:

>Hi,
>
>When I set PessimisticLocking = True in a IBOQuery and I edit a record it
>suddenly fires 'Before Update Trigger' before of post record and than
>when post record.
>
>Why ? How can I avoid it, without to be constrained to evaluate every
>field before to perform operations in trigger?

This is one of the big traps with this style of pess. locking. If you plan
to use it, you need to design your update triggers to take it into
account. Some people add a do-nothing flag to the table, such as IsLocked:

create domain LockFlag as
smallint check (value is null or value = 1);

alter table aTable
add IsLocked LockFlag;

Then you can define custom LockSQL "update Atable set IsLocked = 1 where
<params>.."

Then, in the trigger,
as
begin
if (new.IsLocked = 1) then
EXIT;
else
/* Put all of the genuine trigger stuff inside this block */
begin
new.IsLocked = NULL,
blah....;
end
/* Don't add anything after this other than exception handlers */
end

Helen