foreach ( $res as $boRow ) {
$extDB = $this->getDB( $boRow->bo_cluster );
$blobRow = $extDB->selectRow( 'blobs', '*', array( 'blob_id' => $boRow->bo_blob_id ), __METHOD__ );
foreach ( $res as $boRow ) {
$extDB = $this->getDB( $boRow->bo_cluster );
$blobRow = $extDB->selectRow( 'blobs', '*', array( 'blob_id' => $boRow->bo_blob_id ), __METHOD__ );