Unable to insert the record to table using pre-insert & pre-update trigger

Question

Hi All,
I have tried to insert and update the backend table using the pre-update and pre-insert triggers. But its not working for me. Please find below the code which i have used in the triggers.
Pre-insert trigger:
DECLARE
v_cust_num_cnt NUMBER;
BEGIN
          SELECT      COUNT(customer_number)
          INTO      v_cust_num_cnt
          FROM cmw_bc_mobile_number
          WHERE substr(customer_number,1,15)=substr(:BLOCKNAME.CUSTOMER_NUMBER,1,15);
          IF      v_cust_num_cnt = 0 THEN
                    INSERT INTO cmw_bc_mobile_number (CUSTOMER_NUMBER
                                                                                               ,MOBILE_NUMBER
,CREATION_DATE
VALUES
(substr(:BLOCKNAME.CUSTOMER_NUMBER,1,15)
,:BLOCKNAME.MOBILE_NUMBER
,SYSDATE
COMMIT;                                                                                                    
END IF;          
END;
PRE_UPDATE TRIGGER:
BEGIN
          IF :SYSTEM.RECORD_STATUS = 'CHANGED' THEN
          UPDATE apps.cmw_bc_mobile_number
     SET mobile_number = :BLOCKNAME.MOBILE_NUMBER,
     creation_date = SYSDATE
          WHERE customer_number=substr(:BLOCKNAME.CUSTOMER_NUMBER,1,15);
          COMMIT;
     END IF;
EXCEPTION
          WHEN OTHERS THEN
               NULL;     
END;
Please let someone assist in gettting it resolved.
Regards,
Raj.

Answer 1

Just use MESSAGE (we don't know what fnd_message is, that is some custom code):
message('v_cust_num_cnt='||v_cust_num_cnt);
IF v_cust_num_cnt = 0 THEN
  message('Now inserting...');
  INSERT INTO cmw_bc_mobile_number (CUSTOMER_NUMBER... 
else
  message('Nothing to insert');
end if;