'Return true if the blobname is in the database.
Typically this method is only used for debugging and .has_blob()
is what you want.'

def has_blob_in_db(self, blobname, ctlr=None):

    dbsubpath = self._dbsubpath_from_blobname(blobname, ctlr=ctlr, only_look_in_db=True)
    return (dbsubpath is not None)
