集合中的新实体不会被持久化

Question

JPA + Hibernate

我使用此代码创建一个新的 AvatarAttributeOwnership (AAO) 并将其分配给播放器。但是，新的 AAO 不会持久保存到数据库中。

                // get player
                player = em.find(Player.class, playerId);

                ....

                // give attribute
                player.getAvatarAttributeOwnership().add(new AvatarAttributeOwnership(player, atr.key()));

                // save
                em.persist(player);

实体：

@Entity
public class Player implements Serializable {



    @Id
    @GeneratedValue
    private long id;

    @OneToMany(fetch=FetchType.LAZY,mappedBy="owner")
    private Set<AvatarAttributeOwnership> ownedAvatarAttributes;

    ...

}


@Entity
@Table(uniqueConstraints=@UniqueConstraint(columnNames={"owner","gender","type","attrId"}))
public class AvatarAttributeOwnership implements Serializable {


    @Id
    @GeneratedValue
    @SuppressWarnings("unused")
    private long id;

    @ManyToOne
    @JoinColumn(name="owner")
    private Player owner;

    ...

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + attrId.hashCode();
        result = prime * result + gender.hashCode();
        result = prime * result + owner.hashCode();
        result = prime * result + type.hashCode();
        return result;
    }

    @Override
    public boolean equals(Object obj) {

        if (this == obj) return true;
        if (obj == null) return false;
        if (getClass() != obj.getClass()) return false;

        AvatarAttributeOwnership other = (AvatarAttributeOwnership) obj;

        if (!attrId.equals(other.attrId)) return false;
        if (gender != other.gender) return false;
        if (!owner.equals(other.owner)) return false;
        if (!type.equals(other.type)) return false;

        return true;
    }

}

Answer 1

不知道把它放在哪里，但我认为你可能需要一个 cascade="all" 属性，可能在玩家的 onetomany 中（不确定我是否仍在使用 hbm 文件）。