@EmbeddedId和kundera的OneToMany

Question

我有两个类，我想在EmbeddedId中使用EmbeddedId关系(我使用kundera框架)，我的传感器实体类：

public class SensorEntitie implements Serializable {
    @EmbeddedId
    private CompoundKey key;
    @Column
    private float temperature;
    @Column
    private float pressure;

    @OneToMany(cascade = { CascadeType.ALL }, fetch = FetchType.EAGER)
    @JoinColumn(name="what I should to put here")
    private List<PieceEntitie> pieces;
}
@Embeddable
    public class CompoundKey
    {
        @Column 
        private String IdSensor;           
        @Column 
        private long date;           
        @Column(name = "event_time")
        private long eventTime;

我的作品类实体

public class PieceEntitie implements Serializable{

    /**
     * 
     */
    @Id
    private String IdPiece;
    @Column
    private double width;
    @Column
    private double height;
    @Column
    private double depth;

但是我怎样才能填补@JoinColumn中的空白呢？

Answer 1

我找到了解决方案:要将OneToMany关系与EmbeddedId结合使用，我应该声明JoinColumns和JoinColumn的多重

@OneToMany(cascade = { CascadeType.ALL }, fetch = FetchType.EAGER)
    @JoinColumns({
        @JoinColumn(name = "idsensor", referencedColumnName = "idsensor"),
        @JoinColumn(name = "date", referencedColumnName = "date"),
        @JoinColumn(name = "event_time", referencedColumnName = "event_time")
})

Answer 2

您需要执行以下步骤来修复问题

1. 删除@JoinColumn你不需要写那条语句
2. 删除@OneToMany创建的对象
3. 按照下面的代码使用getter方法绑定@OneToMany

@OneToMany(mappedBy = "pieceEntitie"，级联= CascadeType.ALL，fetch=FetchType.EAGER)

    public Set<PieceEntitie> getPieceEntitie() {
            return pieceEntitie; 
    }