How to customize blob column text displayed in a report

Question

Hi All,
I have a table with column File_name (varchar2) and file_content (blob).
Report generated by the APEX allows me to show report with two different column
File Name || File Content
aaaa Download (link)
bbbb Download (link)
I would like to show the report in such a way the File name column is hyperlinked to download the blob content.
I tried to change the link using the BLOB format mask, but seems it only takes up text value and not column name as #FIELD_NAME#
Any idea how to achieve this ?
I am using Application Express 3.1.2.00.02
Thanks
bala
Edited by: Balamurugan Natarajan on Jun 3, 2009 2:16 AM

Answer 1

I got this online:
create or replace PROCEDURE  download_my_file_sp(p_file in number) AS
        v_mime  VARCHAR2(48);
        v_length  NUMBER;
        v_file_name VARCHAR2(2000);
        Lob_loc  BLOB;
BEGIN
-- Assuming your application's numeric ID is 100, set g_flow_id to
--     that value, otherwise change the value as required.
--***APEX_APPLICATION.G_FLOW_ID := 100;
--***IF NOT wwv_flow_custom_auth_std.is_session_valid then
    -- display this message or a custom message.
--***htp.p('Unauthorized access - file will not be retrieved.');
    -- You can do whatever else you need to here to log the
    --     unauthorized access attempt, get the requestor's
    --     IP address, send email, etc.
  --***  RETURN;
--***END IF;
        SELECT MIME_TYPE, BLOB_CONTENT, name,DBMS_LOB.GETLENGTH(blob_content)
                INTO v_mime,lob_loc,v_file_name,v_length
                FROM document_tb
                WHERE id = p_file;
              -- set up HTTP header
                    -- use an NVL around the mime type and
                    -- if it is a null set it to application/octect
                    -- application/octect may launch a download window from windows
                    owa_util.mime_header( nvl(v_mime,'application/octet'), FALSE );
                -- set the size so the browser knows how much to download
                htp.p('Content-length: ' || v_length);
                -- the filename will be used by the browser if the users does a save as
                htp.p('Content-Disposition:  attachment; filename="'||replace(replace(substr(v_file_name,instr(v_file_name,'/')+1),chr(10),null),chr(13),null)|| '"');
                -- close the headers           
                owa_util.http_header_close;
                -- download the BLOB
                wpg_docload.download_file( Lob_loc );
end download_my_file_sp;Change the link of the PK: Page 3, Item 1: P3_ID, Value: #ID#
create a branch on a different page: Branch to PL/SQL Procedure, Onload Before Header, and Branch Action: download_my_file_sp(:P3_ID)