NO DATA FOUND oracle using cursor - oracle

Question

I have been searching online using different solution suggestion to handle no data in this code but to no avail. how can I handle the exception if no data is found. How can I solve this problem. I am not an expert in oracle though!
DECLARE
nCheckOption INT;
no_data_found EXCEPTION;
CURSOR TYPE_cursor IS
SELECT
D_NAL_REF.TRANS
, D_NAL_REF.INJ
, D_NAL_REF.REF
FROM D_NAL_REF D_NAL_REF
WHERE D_NAL_REF.REF IN
(SELECT AG_REF.REF
FROM AG_REF A_REF
WHERE A_REF.DESCEND_REF = 10
);
BEGIN
FOR rec IN TYPE_cursor
LOOP
nCheckOption := 0;
SELECT 1
INTO nCheckOption
FROM PERSON_TYPE WHERE TRANS = rec.TRANS AND INJ = rec.INJ;
IF nCheckOption = 1 THEN
UPDATE PERSON_TYPE
SET PERSON_TYPE.TYPE = rec.REF
WHERE TRANS = rec.TRANS
AND PERSON_TYPE.INJ = rec.INJ;
END IF;
EXCEPTION
WHEN no_data_found
THEN
DBMS_OUTPUT.PUT_LINE ('Trapped the error!?');
END LOOP;
END;
/

Answer 1

Rewrite your code to eliminate the inner SELECT, which is the only place in your code where I can see that a NO_DATA_FOUND exception could possibly be raised:
BEGIN
FOR rec IN (SELECT d.TRANS,
d.INJ,
d.REF
FROM D_NAL_REF d
WHERE d.REF IN (SELECT a.REF
FROM AG_REF a
WHERE a.DESCEND_REF = 10) AND
(d.TRANS, d.INJ) IN (SELECT DISTINCT TRANS, INJ
FROM PERSON_TYPE))
LOOP
UPDATE PERSON_TYPE
SET TYPE = rec.REF
WHERE TRANS = rec.TRANS AND
INJ = rec.INJ;
END LOOP;
EXCEPTION
WHEN NO_DATA_FOUND THEN
DBMS_OUTPUT.PUT_LINE ('Trapped the error!?');
END;

Answer 2

I think you need to find if cursor contains any record or not. If cursor is empty then it must return that error message written in exception block.
Or you want to print error message if update statement do not find any record to update.
Here is the pseudo code.
Declare
ncheckoption number := 0;
Cursor type_cursor is ....
Begin
For rec in type_cursor loop
ncheckoption := ncheckoption + 1;
Update ...
If sql%rowcount = 0 then
Dbms_output.put_line('error message, if you want here in case no record found in table to update');
-- loop will continue
-- if you want loop to break then issue exit statement here
End if;
End loop;
If ncheckoption = 0 then
Dbms_output.put_line('error message you want to print in case cursor is empty');
End if;
End;
/
Cheers!!