for example

CREATE OR ALTER TRIGGER CUSTOMER_BI FOR CUSTOMER
ACTIVE BEFORE INSERT POSITION 0
as
begin
........
for
select rdb$field_name from rdb$relation_fields
where rdb$relation_name='CUSTOMER'
into field_name
new.field_name=upper(new.field_name)
.........
end;

i want to "new.field_name=upper(new.field_name)" row.
i want write only one sql for all tables in trigger and all field values upper case.