APEX

Hi Vincent,

I think that you can download blob content returned by a function without any problem. In the example below, the function get_blob returns a BLOB, you will have to specify the mime type and filename, and the BLOB length is obtained using the function DBMS_LOB.GETLENGTH. Finally, a call to the wpg_docload.download_file procedure is made. To call the download_file procedure you can do it through the URL or through a page with a "Branch To PL/SQL Procedure" in the "Before Header" point. More info about this kind of procedure here.

create or replace PROCEDURE  "DOWNLOAD_FILE"
(
    inID NUMBER
)
AS
    vMIME VARCHAR2(48);
    vLENGTH NUMBER;
    vFILENAME VARCHAR2(2000);
    vBLOB BLOB;
BEGIN
    vMIME := 'application/octet-stream';
    vFILENAME := 'Test.sql';
    vBLOB := get_blob(inID);
    vLENGTH := DBMS_LOB.GETLENGTH(vBLOB);
    owa_util.mime_header(nvl(vMIME, 'application/octet'), FALSE);
    htp.p('Content-length: ' || vLENGTH);
    htp.p('Content-Disposition: attachment; filename="' || SUBSTR(vFILENAME, INSTR(vFILENAME, '/') + 1) || '"');
    owa_util.http_header_close;
    wpg_docload.download_file(vBLOB);
END;

Regards,

Sergio