Downloading BLOBs in a report

Question

I tried to put a link to a downloadable column on a table ( a blob ) on a report.
If you insert an element and then you try to list it in the report, the link works, and you download the file you entered. Buty if you close your session, and reopen it... at the time you try to download the file you get and error
Tue, 17 Apr 2001 13:54:41 GMT
ORA-01403: no data found
ORA-06512: at "PORTAL30.WWA_API_MODULE_STACK", line 124
ORA-06512: at "PORTAL30.WWA_APP_MODULE", line 1495
ORA-06512: at "TDCINTRANET.FILE_DOWNLOAD", line 13
ORA-06512: at line 8
DAD name: portal30
PROCEDURE : TDCINTRANET.file_download
URL : http://debian.netjuice-network.com:7777/pls/portal30/TDCINTRANET.file_download?p_block=DEFAULT&p_object=DATA&p_ID=Unai%20Mantenimiento
PARAMETERS :
============
p_block:
DEFAULT
p_object:
DATA
p_ID:
Unai Mantenimiento
When you UPDLOADED a file in the same session, everything works fine for all the blobs in the table.... but if you DON't UPLOAD anything in the same session.... portal crashes the way I showed....
Any advice?
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Answer 1

Unai,
1. Oracle Portal does support (in both forms and reports) interMedia object types for audio, video and image documents. So, if your table contains ORDIMAGE, ORDAUDIO or ORDVIDEO columns they will be recognized when you build a form or report on that table. interMedia provides better control over those types of documents than standard BLOBs.
2. The APIs of WWA_APP_MODULE are internal forms APIs and should not be called directly by user code.
3. If you looked at the generated forms package, you probably have an idea how to download a BLOB data, here is an example to replace the code you have:
procedure download_1
p_rowid in varchar2
is
l_size integer;
l_blob blob;
l_tmpblob blob;
l_mimetype varchar2(4000);
l_rowid urowid;
begin
htp.init;
l_rowid := p_rowid;
SELECT MY_BLOB
INTO l_blob
FROM SCOTT.EMP1B
WHERE ROWID = l_rowid;
l_size := dbms_lob.getlength(l_blob);
dbms_lob.createtemporary(l_tmpblob,true);
dbms_lob.copy(l_tmpblob,l_blob,l_size,1,1);
owa_util.mime_header('image/gif', false,null);
htp.p('Content-length: '| | l_size);
htp.p('Pragma: no-cache');
htp.p('Cache-Control: no-cache');
htp.p('Expires: Thu, 01 Jan 1970 12:00:00 GMT');
owa_util.http_header_close;
wpg_docload.download_file(l_tmpblob);
dbms_lob.freetemporary(l_tmpblob);
exception
when others then
owa_util.mime_header('text/html', false);
htp.p('Content-length: 0');
owa_util.http_header_close;
end download_1;
Hope this will help.
Thanks,
Dmitry
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