Image from database won't display in page region

Question

I’m having difficulty getting an image stored in the database to display in an HTMLDB page region. I’ve consulted the tutorial in Sergio’s Blog and looked for relevant threads in this forum but am still having problems. Any insights into where I’m going wrong would be very helpful.
I’m using HTML DB 1.5.1.00.12 and database 10.1.0.2.0 on an x86 machine running Win 2k SP4. My browser is IE6.
First, here’s the procedure I wrote to display the picture. Although the variable names have been changed this is substantially the same as the procedure in the tutorial:
CREATE OR REPLACE PROCEDURE download_pic(p_personid in number) as
v_mimetype VARCHAR2(255);
v_length NUMBER;
v_filename VARCHAR2(255);
v_picture BLOB;
BEGIN
SELECT mimetype, picture, SUBSTR(filename, INSTR(filename, '/') +1), dbms_lob.getlength(picture) INTO v_mimetype, v_picture, v_filename, v_length FROM TBLPICTURE WHERE personid = p_personid;
owa_util.mime_header(v_mimetype, FALSE);
htp.p('Content-length: ' || v_length);
htp.p('Content-Disposition: filename="' || v_filename || '"');
owa_util.http_header_close;
wpg_docload.download_file(v_picture);
end download_pic;
Enterprise Manager tells me that the procedure is valid, and I made sure to grant execute to public.
Here’s the source for my PL/SQL page region:
DECLARE
v_personid NUMBER;
BEGIN
SELECT PERSONID INTO v_personid FROM TBLPICTURE WHERE PERSONID = :P5_PERSONID;
HTP.P('<IMG SRC=”#OWNER#.download_pic?p_personid=’ || v_personid || '”>’);
EXCEPTION WHEN no_data_found THEN
HTP.P('No picture in system');
END;
When I run the page my region displays properly but I get the red X where my picture should be. A review of the HTTP server’s error log tells me that the server thinks my procedure (HTMLDB.DOWNLOAD_PIC) doesn’t exist. If I create a second PL/SQL page region and set the region source to just the display_pic procedure by itself, using a static number as the p_personid parameter, the picture displays in my browser, but as the only object on the page. Typing the URL http://localhost:7777/pls/htmldb/htmldb.download_pic?p_personid=1 directly into my browser also gives me the “procedure doesn’t exist” error. So I believe my procedure works correctly but somehow my URL in the img tag is incorrect.
Here’s my marvel.conf file just in case it helps solve the problem:
Alias /i/ "D:\oracle\product\10.1.0\CompanionCD/marvel/images/"
<Location /pls/htmldb>
SetHandler pls_handler
Order deny,allow
Allow from all
AllowOverride None
PlsqlDatabaseUsername HTMLDB_PUBLIC_USER
PlsqlDatabasePassword @BTV4hSLn+NKXXGs045hwqYeJ+u2gWjROPQ==
PlsqlDatabaseConnectString BE4013882062404:1521:Robert ServiceNameFormat
PlsqlDefaultPage htmldb
PlsqlDocumentTablename wwv_flow_file_objects$
PlsqlDocumentPath docs
PlsqlDocumentProcedure wwv_flow_file_manager.process_download
PlsqlAuthenticationMode Basic
PlsqlNLSLanguage AMERICAN_AMERICA.WE8MSWIN1252
Again, any assistance that anyone can provide would be very helpful. Thanks!

Answer 1

Robert,
please describe your task correctly:
You want to create a link (in report) with download image capability, or you need to SHOW image in report? This is a bit difference tasks.
I solved this tasks, you can do both capability in one report. It easy.
1. wpg_docload procedure can be used only for download image/BLOB, not show it.
2. For both download/show BLOB you need dual link with two different procedures. One with wpg_docload call for download, another for show with htp.prn (not htp.p!*) call for show. Then you can create call both procedures from your SQL repors select.
3. Viola, all works perfectly.
*Note: htp.p inserts newline after every block of BLOB, so JPEG with size> 32K will be incorrectly shown. htp.prn makes uninterrupted output without newline insert.