学说中的一对多与多对一关系

I have 2 Tables

1. Users
2. Messages

And the Structure of Tables:

Users:

Messages:

Now see there are number of users in Users Table and their messages are stored in Messages table identifying by sender_id and receiver_id

How can I make One-To-Many and Many To One Relationship between these two tables or create this SQL Schema using Doctrine/Annotations?

Something like that:

/**
 * @ORM\Entity
 * @ORM\Table(name="messages")
 */
class Comment
{
    /**
     * @ORM\Id
     * @ORM\Column(type="integer")
     * @ORM\GeneratedValue(strategy="AUTO")
     */
    protected $id;

    /**
     * @ORM\Column(type="string", length=5000, nullable=true)
     */
    protected $text;


    /**
     * Author of the comment
     *
     * @ORM\ManyToOne(targetEntity="Acme\UserBundle\Entity\User")
     * @var User
     */
    protected $sender;

   /**
     * 
     *
     * @ORM\ManyToOne(targetEntity="Acme\UserBundle\Entity\User")
     * @var User
     */
    protected $reciever;