Inconsistent Links w/ GET_BLOB_FILE_SRC

Hello,
I have a region that includes a link to a BLOB using GET_BLOB_FILE_SRC. I have placed this region on Page 0 so that it repeats in the sidebar of every page. On some pages the link works as expected and downloads the BLOB. However, on one particular page, the link produces a "PAGE NOT FOUND" error. The syntax for the SQL to retrieve the BLOB is:
CASE WHEN
NVL(dbms_lob.getlength(V_CONTENTS),0) = 0
THEN
NULL
ELSE
'<*a href="'||apex_util.get_blob_file_src('P35_V_CONTENTS', "CC_MEMBERS"."ID")||'" title="Download vCard"><img src="'||:WORKSPACE_IMAGES||'vcard.jpg" /></a>'
END as VCARD
* ignore the asterik, I had to add it to the post so Forums wouldn't literally interpret the "<a" tag.
The page(s) that works produce the URL:
http://localhost:8080/apex/apex_util.get_blob_file?a=101&s=8396757249800286&p=35&d=9761778854785863315&i=9761771846677734677&p_pk1=442&p_pk2=&p_ck=8170B24863751BFB4ACE607D74A58889
While the errant page produces:
http://localhost:8080/apex/apex_util.get_blob_file?a=101&s=4253543627310563&p=35&d=11872333539480757720&i=9761771846677734677&p_pk1=442&p_pk2=&p_ck=E9838B87034D4D9F19B7F85997953342
Any suggestions as to what might be the problem?
Edited by: jritschel on May 26, 2009 12:17 PM
Edited by: jritschel on May 26, 2009 12:24 PM

Those were from different sessions, but the results are the same. Here is an example from the same session:
Failed Link -
https://localhost:8080/apex/apex_util.get_blob_file?a=19038&s=927230068543966&p=35&d=14744341426526826663&i=12633779733723803620&p_pk1=401&p_pk2=&p_ck=F0F812A0BEFBB5832F39BB942AA0BCEA
Working Link -
https://localhost:8080/apex/apex_util.get_blob_file?a=19038&s=927230068543966&p=35&d=12633786741831932258&i=12633779733723803620&p_pk1=401&p_pk2=&p_ck=8415F41A1E002BE095CD2817842B8A30
The d= parameter seems to be the one that differs between the working/non-working pages. Do you know what that represents and where it gets assigned? I do have several links on each page that point to different BLOB records in the same table and the behavior is consistent in that either all links work or fail on a given page.
I've also done some further testing and it looks like this error is happening mostly on pages where I have links to BLOBs coming from two different ables on the same page.

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If you please can take a look here : http://apex.oracle.com/pls/otn/f?p=11910:9:276337790571189::YES:::
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pass
Edited by: andrey on Jul 12, 2009 9:01 PM

The PL/SQL Function source value for the item is:
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...and the format mask for the item is:
DOWNLOAD:DEMO_PRODUCT_INFO:PRODUCT_IMAGE:PRODUCT_ID
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Thanks a lot in advance.
Ann.

Hi Ann,
Here you can see and download the example :
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Hint, Please read the FAQ section. had you put your thread in a better format, you would have gotten a quicker response :)
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Thanks
LEH

John,
The problem is that I do not know how to use the "GET_BLOB_FILE_SRC Function". I never got it to work but the HTML Expression did work for me. If you know how the GET_BLOB_FILE_SRC Function works then that would be helpful. I don't think it would be helpful if I posted my example on apex.oracle.com. But here is the information I have on the GET_BLOB_FILE_SRC Function.
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GET_BLOB_FILE_SRC Function
As an alternative to using the built-in methods of providing a download link, you can use the APEX_UTIL.GET_BLOB_FILE_SRC function. One advantage of this approach, is the ability to more specifically format the display of the image (with height and width tags). Please note that this approach is only valid if called from a valid Oracle Application Express session. Also, this method requires that the parameters that describe the BLOB to be listed as the format of a valid item within the application. That item is then referenced by the function.
See Also:
"About BLOB Support in Forms and Reports" in Oracle Application Express Application Builder User's Guide
Syntax
FUNCTION GET_BLOB_FILE_SRC (
 p_item_name IN VARCHAR2 DEFAULT NULL,
 p_v1 IN VARCHAR2 DEFAULT NULL,
 p_v2 IN VARCHAR2 DEFAULT NULL,
 p_content_disposition IN VARCHAR2 DEFAULT NULL)
 RETURN VARCHAR2
Parameters
Table 1-28 describes the parameters available in GET_BLOB_FILE_SRC function.
Table 1-28 GET_BLOB_FILE_SRC Parameters
Parameter Description
p_item_name
Name of valid application page ITEM that with type FILE that contains the source type of DB column.
p_v1
Value of primary key column 1.
p_v2
Value of primary key column 2.
p_content_disposition
Specify inline or attachment, all other values ignored
Example
As a PLSQL Function Body:
RETURN '<img src="'||APEX_UTIL.GET_BLOB_FILE_SRC('P2_ATTACHMENT',:P2_EMPNO)||'" />';
As a Region Source of type SQL:
SELECT ID,
 NAME,
 CASE WHEN NVL(dbms_lob.getlength(document),0) = 0
 THEN NULL
 ELSE CASE WHEN attach_mimetype like 'image%'
 THEN '<img
src="'||apex_util.get_blob_file_src('P4_DOCUMENT',id)||'" />'
 ELSE '<a
href="'||apex_util.get_blob_file_src('P4_DOCUMENT',id)||'">Download</a>'
 end
 END new_img
 FROM TEST_WITH_BLOB
The previous example illustrates how to display the BLOB within the report, if it can be displayed, and provide a download link, if it cannot be displayed.Thanks
LEH

Inconsistent Links w/ GET_BLOB_FILE_SRC

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