Image display: instead of an image, there is a "picture placeholder" icon

Question

Hello everyone!
I'm afraid I need some assistance. As I've already indicated in a thread title, I have problems while trying to display an image stored within the database. I read zillion threads here on OTN, searched the Internet, but I can't make it work. More or less, it comes to what Denes Kubicek provided [url http://htmldb.oracle.com/pls/otn/f?p=31517:64:850093673123067]here
Tools I use are Oracle 10g XE database (10.2.0.1.0) and Application Express (3.2.1.00.10).
There's a table that contains information about certain products (such as printer toners, cartridges, CD media etc.). This is its description:
SQL> desc pm_materijal
Name                          Null?    Type
ID                            NOT NULL NUMBER
IDG                                    NUMBER
SIFRA                                  VARCHAR2(30)
SIFRA_KRATKA                           VARCHAR2(30)
MODEL                                  VARCHAR2(30)
NAZIV                                  VARCHAR2(255)
NAPOMENA                               VARCHAR2(255)
FILE_NAME                              VARCHAR2(200)
MIME_TYPE                              VARCHAR2(255)
BLOB_CONTENT                           BLOBOne of its records looks like this (other column values are unimportant) (columns are formatted so that they fit a single line):
SQL> select id, naziv, file_name, dbms_lob.getlength(blob_content) len
  2  from pm_materijal
  3  where id = 64;
        ID NAZIV                FILE_NAME                                    LEN
        64 CD recordable 1/50 Now I'd like to attach an image to those CDs.
In my Apex application, I created an item (on a page 7) whose name is P7_BROWSE (Display as "File Browse") - it is used to browse directories for files (images, actually). In order to support table record updating, I created a Process (Process point: On submit - after computations and validations).
if :p7_browse is not null then
   update pm_materijal set
     (mime_type, file_name, blob_content) =
     (select
        mime_type, name, blob_content
        from wwv_flow_files
        where name = :p7_browse
     where id = :p7_id;
   delete from wwv_flow_files
     where name = :p7_browse;
end if;It seems that it works OK, because - once I select an image (it is a JPG file, its size is 116 x 116) and push the "Apply Changes" button - the result is as following:
SQL> select id, naziv, file_name, dbms_lob.getlength(blob_content) len
  2  from pm_materijal
  3  where id = 64;
        ID NAZIV                FILE_NAME                                    LEN
        64 CD recordable 1/50   F477411270/cd_50_komada.jpg                 2111           My next step was to create a stored procedure which will be used to display images:
SQL> create or replace procedure image_display (p_id in number)
  2  as
  3    l_mime        varchar2 (255);
  4    l_length      number;
  5    l_file_name   varchar2 (200);
  6    l_blob        blob;
  7  begin
  8    select mime_type,
  9           blob_content,
10           file_name,
11           dbms_lob.getlength (blob_content)
12      into l_mime,
13           l_blob,
14           l_file_name,
15           l_length
16      from pm_materijal
17      where id = p_id;
18
19     owa_util.mime_header (nvl (l_mime, 'application/octet'), false);
20     htp.p ('Content-length: ' || l_length);
21     owa_util.http_header_close;
22     wpg_docload.download_file (l_blob);
23  end image_display;
24  /
Procedure created.As suggested in a few OTN threads, I did this too (although I don't quite understand WHY, as I created the procedure in a schema I use in Apex; there are no other users involved). Anyway: I thought that it won't do any harm (but it didn't do any good either).
SQL> grant execute on image_display to public;
Grant succeeded.
SQL> create public synonym image_display for radni.image_display;
Synonym created.Back to Application Express: I created a Reports Region (Type: SQL Query). Its source is :
select
  id,
  file_name,
  mime_type,
  dbms_lob.getlength(blob_content) len,
  '<img src="#OWNER#.image_display?p_id='
         || NVL (ID, 0)
         || '" height="'
         || 120
         || '" width="'
         || 120
         || '" />' image
from pm_materijal
where id = :P7_IDFinally, run the page! Reports region contains a single record which displays information I selected in SQL*Plus (so it seems that query DOES return something, and - I'd say that it is correct), but - instead of an image - there's an "invalid (broken) image" icon (you know, a small white rectangle with a red <font color="red">x</font>).
I can't figure out what I did wrong. It should work, but it doesn't. Could someone, please, point me to the right direction?
Regards,
LF

Answer 1

Patrick said: specify your schema name instead of the #OWNER# placeholder
I said: while I was trying to make it work, I used "schema_owner.procedure_name" notation too but that didn't help eitherOracle user name is "RADNI" (the one I used to create objects, I was connected to it in SQL*Plus - all my previous copy/pastes were taken while connected to that user).
So I tried with
- <img src="radni.image_display?p_id=...   => didn't work
- <img src="RADNI.image_display?p_id=...   => didn't work
- <img src="image_display?p_id=...         => worked
{code}
I just started using Application Express so, basically, every day I discover something new. I purchased a book (based on Apex 3.2) so I thought that I'd rather stick to it until I +get a feeling+ and then, hopefully, move on to a higher version.
By the way, looking forward to see you on HrOUG in two weeks!