Display Field Query

Question

Hi all,
I am new to Oracle forms, and bit stuck in middle of no where.
The question is:
When ever I press a button it displays the answer into the given display field. I have create the display field, attached the trigger with button ie when button pressed, done the half codding but at the end of the codding don't know how to display the result in display field.
The same like we use in sqlplus DBMS_OUTPUT.PUT_LINE
Thanks

Answer 1

Thanks your reply,
I have created a Trigger:
SQL > DECLARE
V_DATE VARCHAR2(50);
CURSOR C_DATE IS
select trunc(months_between(:DATE_DIFFER.HIGHER_DATE,:DATE_DIFFER.LOWER_DATE)/12)||' years '
||trunc((months_between(:DATE_DIFFER.HIGHER_DATE,:DATE_DIFFER.LOWER_DATE) - trunc(months_between(:DATE_DIFFER.HIGHER_DATE,:DATE_DIFFER.LOWER_DATE)/12)*12)) ||' months '
|| trunc((:DATE_DIFFER.HIGHER_DATE - add_months(:DATE_DIFFER.LOWER_DATE,months_between(:DATE_DIFFER.HIGHER_DATE,:DATE_DIFFER.LOWER_DATE))))|| ' days '
from dual;
BEGIN
OPEN C_DATE;
FETCH C_DATE INTO V_DATE;
:date_display := V_DATE;
CLOSE C_DATE;
END;
But getting an error DUAL must be declared...Its not an database its, so how I can use DUAL function..
Thanks