PLSQL: IF EXISTS in stored procedure while using loop - arrays

Question

I am new to PLSQL. I am trying to create a procedure which iterates through an array.
My requirement is if one of the value is not found in table, it should add into FAILARRAY, otherwise it should add into PASSARRAY.
I was getting no data found exception even if it is handled, it goes out of the loop and next value in the loop is not getting iterated again.
Is there any way we can use if exists command here. Please help.
CREATE OR REPLACE PROCEDURE SCHEMA.PR_VALIDATE
(
FILEARRAY IN STRARRAY,
PASSARRAY OUT STRARRAY,
FAILARRAY OUT STRARRAY,
)
IS
--DECLARE
fileName VARCHAR2 (50);
fileId NUMBER;
BEGIN
for i in 1 .. FILEARRAY.count
loop
fileName := FILEARRAY(i);
DBMS_OUTPUT.put_line (FILEARRAY (i));
SELECT FILEID into fileId FROM TABLE_NAME WHERE FILENAME=fileName;
end loop
END;

Answer 1

I suspect you haven't realised that you can have a PL/SQL BEGIN ... END block, including an exception handler, within a loop. In fact, anywhere you can have PL/SQL statements you can have a block.
You mention an exception handler, although your code doesn't contain one. As you say your code goes 'out of the loop', I can only assume it's, well, outside of the for loop. But you can easily add a block, with an exception handler, inside the for loop, for example:
BEGIN
for i in 1 .. FILEARRAY.count
loop
fileName := FILEARRAY(i);
DBMS_OUTPUT.put_line (FILEARRAY (i));
-- Inner block starts at the line below:
BEGIN
SELECT FILEID into fileId FROM TABLE_NAME WHERE FILENAME=fileName;
-- TODO add to PASSARRAY
EXCEPTION
WHEN NO_DATA_FOUND THEN
-- TODO add to FAILARRAY
END;
end loop
END;
This way, if there are 8 values in FILEARRAY and no data is found in the table for the third value, the NO_DATA_FOUND exception gets caught without exiting the loop and the loop then progresses to the fourth value in FILEARRAY.

Answer 2

You are handling the exception but you need to avoid the exception. Try:
SELECT NVL(FILEID, "<Put Something here or leave it empty") FROM TABLE_NAME WHERE FILENAME=fileName;
That way if it finds a null value in the select it will just pull "" instead. Then you can check to see if your SELECT returns "" and if so populate your FAILARRAY, otherwise populate PASSARRAY.

Answer 3

CREATE OR REPLACE PROCEDURE SCHEMA.PR_VALIDATE(
FILEARRAY IN STRARRAY,
PASSARRAY OUT STRARRAY,
FAILARRAY OUT STRARRAY )
IS
fileName VARCHAR2 (50);
l_n_count NUMBER;
l_n_file_id NUMBER;
BEGIN
FOR i IN 1 .. FILEARRAY.count
LOOP
fileName := FILEARRAY(i);
DBMS_OUTPUT.put_line (FILEARRAY(i));
SELECT COUNT(FILEID) INTO l_n_count FROM TABLE_NAME WHERE FILENAME=fileName;
IF l_n_count =0 THEN
failarray(i):='No Value Found';
elsif l_n_count=1 THEN
SELECT FILEID INTO l_n_file_id FROM TABLE_NAME WHERE FILENAME=fileName;
Passarray(i):=l_n_file_id;
END IF;
END LOOP;
END;
/