PL SQL block - Check for empty file

Question

Hello,
I need help in writing pl sql code to check a file to verify if it has 0 records (file size = zero kb.) In a preceding pl sql block, I am performing a SELECT on data and writing it to a file. If that file is empty/has no records, then I would like to stop the process from continuing on to my next pl sql block which performs an update function.
Summary:
1) Create file from SELECT
2) Check file for zero data, if true, trigger error, if false, continue to next pl sql block.
3) Run update on records if data exists in the file.
Thanks in advance!

Answer 1

Thanks John,
You've been of great help so far and a really appreciate it. I'm so close to getting this, I just need help with how to create an error when the file shows no data. I will be running this as an Oracle Apps Concurrent request. I'd like for the job to end in error when no data exists for the file. In unix, I can enter "EXIT 1" and it signals to the concurrent manager to put end the job with an error status. How can I do something similar using pl sql? Here is my code so far, with the missing piece. Thanks!
DECLARE
  vFile UTL_FILE.FILE_TYPE;
  vrecs BOOLEAN := FALSE;
  vnodata EXCEPTION;
BEGIN
  vFile := UTL_FILE.FOPEN('/devlop, 'norecs.txt', 'w', 32767);
FOR x IN (
SELECT
     node_name AS txt
FROM
     applsys.fnd_nodes
WHERE
     node_name = 'blahblahblah'
LOOP
        vrecs := TRUE;
        UTL_FILE.PUT_LINE (vFile, x.txt);
END LOOP;
        UTL_FILE.FCLOSE(vFile);
        IF NOT vrecs THEN
            RAISE vnodata;
        END IF;     
EXCEPTION
       WHEN vnodata THEN
    *<what can I put here to cause the pl sql block to error???>*
END;
/