src/Zf2Forum/Model/Message/MessageMapper.php
public function getMessageById($messageId)
    {
        $select = $this->getSelect()
                       ->where(array($this->messageIDField => $messageId));
        return $this->select($select)->current();
    }
public function getMessageById($messageId)
    {
        $select = $this->getSelect()
                       ->where(array($this->messageIDField => $messageId));
        return $this->select($select)->current();
    }
getMessageById

@param int $messageId
@return MessageInterface