Export blobs of multiples in jpg format

Hello people,

Currently, I am trying to understand how to implement the procedure to extract an image https://oracle-base.com/articles/9i/export-blob-9i and apply to many images (more than 1000). I searched through the forums and found several references to this example, but none doesn't really explain how to apply for multiple lines. I'm not qualified in PL/SQL, but I have experience of programming and I edited the procedure for naming the file according to a unique number but I am at a loss of how to apply for multiple records.

create or replace procedure write_blob is

l_file UTL_FILE.FILE_TYPE;
l_buffer RAW(32767);
l_amount BINARY_INTEGER := 32767;
l_pos INTEGER := 1;
l_blob BLOB;
empidnum varchar2(10);
l_blob_len INTEGER;

-- Get LOB locator
SELECT
E.ID, 
M.GRAPHIC into empidnum, l_blob
FROM
EMPLOYEES E, LINKIMAGE LM, MASTERIMAGE M
WHERE
E.IDNUM = LM.FKTABLE
AND LM.FK = M.IMGNUM
AND LM.TYPE = 'ID'
AND E.ID = 'BX22563'
ORDER BY E.ID;

-- Establish length of BLOB
l_blob_len := DBMS_LOB.getlength(l_blob);

-- Open the destination file.
l_file := UTL_FILE.fopen('BLOB_DIR',empidnum||'.jpg','w', 32767);

-- Read chunks of the BLOB and write them to the file until complete.
WHILE l_pos < l_blob_len LOOP
DBMS_LOB.read(l_blob, l_amount, l_pos, l_buffer);
UTL_FILE.put_raw(l_file, l_buffer, TRUE);
l_pos := l_pos + l_amount;
END LOOP;

-- Close the file.
UTL_FILE.fclose(l_file);

EXCEPTION
WHEN OTHERS THEN
-- Close the file if something goes wrong.
IF UTL_FILE.is_open(l_file) THEN
UTL_FILE.fclose(l_file);
END IF;
RAISE;

end write_blob;

Yes, the logic is wrong.

(1) it has no code to exit the recovery loop when you have no extra data. I'd just use ' to d_select (put your query here) loop "-this is called a cursor for loop and it's much easier than the explicit with fetch cursor and 'leave when.

(2) you open the file in the loop but never close.

Tags: Database

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