APEX

Hi,

I am quite new to APEX. I have following query.


I have following code on a button in APEX.
when I click on this button, I want to pop-up/messagebox
as "No employee found"

  DECLARE
  BEGIN
   SELECT ename INTO V_ENAME
	FROM EMP
	WHERE  1 =2 ;
	
   EXCEPTION 
   WHEN OTHERS
	THEN
	  DBMS_OUTPUT.PUT_LINE('No emplyee found');     
                 --I know we cannot use this way to show popup/messagebox
                 --but what is the alternative so that process show a popup/message.
  END;  
  
  

Can you please let me know how to implement this?