Thread: Player xferring

Originally Posted by clem585

I'm not sure how complex types are handled. Let's say you have:

Code:

public class Player extends Entity {

private Inventory inventory;

}

How does this get mapped internally in the DB with hibernate? Wouldn't it be 2 tables?

No, you have to annotate the fields that map to a column in a table.

e.g.

Code:

@Entity
@Table(name = "players")
public class Player {
    @Id
    @Column(name = "id")
    private long id;

    @Column(name = "username")
    private String username;

    /* your normal code that isn't persistence */
    private Inventory inventory;

    public Player() { /* empty constructor for hibernate */ }

    /* your normal code */
    public Inventory getInventory() { return inventory; }
    public void setInventory(Inventory inventory) { this.inventory = inventory; }

    /* setters and getters are required by hibernate */
    public long getId() { return id; }
    public void setId(long id) { this.id = id; }
    public String getUsername() { return username; }
    public void setUsername(String username) { this.username = username; }
}

Now if you want to store your items in a table you can...

Code:

@Entity
@Table(name = "inventory")
public class Inventory {
 // ... code similar to above but for inventory ...
}

and then construct everything:

Code:

Player player = HibernateUtil.getPlayer(id);
player.setInventory(HibernateUtil.getInventory(player));

But you don't need to have a separate table for your inventory. If you want to, you can, you should.