Does BLOB Support in Reports really work? As referenced in the doco..

Question

I am referring to chapter 15 of the application builder user guide.
http://download.oracle.com/docs/cd/E17556_01/doc/user.40/e15517/advnc.htm#BCGBCHBD
Oracle Application Express includes BLOB support for both classic and interactive reports. If you use a wizard to create a report and include a column of type BLOB, basic support will be included. Additional information should be added after generation to make the download capability more user friendly.
Consider the following example:IMAGE:EMP:RESUME:EMPNO::RESUME_MIMETYPE:RESUME_FILENAME:RESUME_LAST_UPDATE::attachment:Resume
If you have a report column with a format mask that begins with 'IMAGE:', you will see a link below the format 'BLOB Download Format Mask'. This popup assists in entering all the parameters necessary for the IMAGE format.>
So, I have just done the following.
CREATE TABLE "IMAGE"
    "IMAGE_ID" NUMBER NOT NULL ENABLE,
    "BINARY" BLOB,
    CONSTRAINT "IMAGE_PK" PRIMARY KEY ("IMAGE_ID")
  create sequence seq_image start with 1 increment by 1;
  CREATE OR REPLACE TRIGGER "BI_IMAGE" BEFORE
  INSERT ON IMAGE FOR EACH ROW BEGIN
  SELECT seq_image.nextval INTO :NEW.image_id FROM dual;
END;
/Then create a form to upload images. That's successful.
Then create a page with report to display the images.
select image_id, binary
from imagePreview report, just get '[unsupported data type]' displayed for the binary column - which is fine.
So then I go to into the column attributes to specify the BLOB format mask, giving me:
DOWNLOAD:IMAGE:BINARY:IMAGE_ID::MIME_TYPE::::inline:Download
I have tried both the format mask for providing a download link, and displaying the image, both to no avail.
All I get is:
ORA-06502: PL/SQL: numeric or value error: character to number conversion errorAm I missing something?
nb: Yes, I do know about the APEX_UTIL.GET_BLOB_FILE_SRC function, but since the above method is in the documentation, you would think it would work, right?

Answer 1

Hi,
Yes, mime type is in the table, and is referenced in the format mask.
OK - I didn't have a filename column, and since it is not a required field for the format mask, I figured I wouldn't need it - Although I gave the example of using the link, I actually just want the image to display, using the technique that is documented - which also produces the same error. Both should work, no?
Even so, i just gave it a try with filename referenced in the format mask, same issue.
Ta,
Trent