Problems using apex_util.get_blob_file_src

Question

I am currently trying to use apex_util.get_blob_file_src to display an image in my report.
My SQL statement looks as follows:
SELECT
  obj.ID,
  obj.BESCHREIBUNG as BESCHREIBUNG,
  ort.BEZEICHNUNG as ORT,
  rgn.REGION as REGION,
  AVG(vfb.PREISPROWOCHE) as PREISPROWOCHE,
  '<img src="'||apex_util.get_blob_file_src('P19_UPLOAD',MIN(bld.ID))||'" />' AS IMAGE
FROM
  F_OBJEKTE obj
  INNER JOIN F_ORTE ort ON obj.ORT = ort.ID
  INNER JOIN F_REGIONEN rgn ON obj.REGION = rgn.ID
  INNER JOIN F_VERFUEGBARKEIT vfb ON obj.ID = vfb.OBJEKT
  INNER JOIN F_BILDER bld ON obj.ID = bld.OBJEKT
GROUP BY
  obj.ID,
  obj.BESCHREIBUNG,
  ort.BEZEICHNUNG,
  rgn.REGIONThe apex_util.get_blob_file_src only returns an empty string though. P19_UPLOAD is the correct name of the element taking the image file and bld.ID is the correct ID of the element within it's table. The aggregation is because each object can have multiple pictures, but I only want to have one of them displayed in the report. What I am currently suspect is, that maybe the image files aren't uploaded correctly. The datasets are created however, I'm just not sure if the blob filed actually holds the data of the image - and I'm not sure on how to test this... any suggestions?

Answer 1

Noone any suggestions on what might be going wrong?