public function getOrderBy()
    {
        if ($this->order_by === false) {
            $this->order_by = $this->pool->getEscapedTypeOrderBy($this->getRegisteredType());
        }

        return $this->order_by;
    }
public function getOrderBy()
    {
        if ($this->order_by === false) {
            $this->order_by = $this->pool->getEscapedTypeOrderBy($this->getRegisteredType());
        }

        return $this->order_by;
    }
public function getOrderBy ( ) { if ( $ this -> order_by === false ) { $ this -> order_by = $ this -> pool -> getEscapedTypeOrderBy ( $ this -> getRegisteredType ( ) ) ; } return $ this -> order_by ; }
Return order by.

@return string|null
Return order by .