复合密钥的JPA映射问题

我有一张下面的地图

@Entity
@Table(name = "auctions")
public class Auction{
.
.
    @OneToMany(cascade = CascadeType.ALL, mappedBy = "auction")
    private List<AuctionParamValue> auctionParamValueList;
.
.
}


@Entity
@Table(name = "auction_param_values")
public class AuctionParamValue {

    @EmbeddedId
    protected AuctionParamValuePK auctionParamValuePK;

    @JoinColumn(name = "auction_param_id", referencedColumnName = "auction_param_id",updatable=false,insertable=false)
    @ManyToOne 
        private AuctionParam auctionParam;

    @JoinColumn(name = "auction_id", referencedColumnName  = "auction_id",updatable=false,insertable=false)
    @ManyToOne @MapsId("auctionId") 
        private Auction auction;
}

@Embeddable
public class AuctionParamValuePK {
    @Id 
    @Basic(optional = false)
    @Column(name = "auction_id")
    private long auctionId;

    @Id
    @Basic(optional = false)
    @Column(name = "auction_param_id")
    private int auctionParamId;
}

@Entity
@Table(name = "auction_params")    
public class AuctionParam {
    @OneToMany(cascade = CascadeType.ALL, mappedBy = "auctionParam")
    private List<AuctionTypeParam> auctionTypeParamList;

    @OneToMany(cascade = CascadeType.ALL, mappedBy = "auctionParam")
    private List<AuctionParamValue> auctionParamValueList;
 }

---

对于

Auction

-

AuctionParamValue

关系，您需要执行以下操作：

@Entity @Table(name = "auctions") 
public class Auction {
    @OneToMany(cascade = CascadeType.ALL, mappedBy = "auction")
    private List<AuctionParamValue> auctionParamValueList;
    ...
}   

@Entity @Table(name = "auction_param_values")
public class AuctionParamValue {
     @EmbeddedId
     protected AuctionParamValuePK auctionParamValuePK;

     @ManyToOne @MapsId("auctionId")
     private Auction auction;

     ...
}

@Entity@Table（name=“拍卖”）
公开拍卖{
@OneToMany（cascade=CascadeType.ALL，mappedBy=“拍卖”）
私有列表，第2.4.1.3节。
由
mappedBy
引用的
auction
和
auctionParam
属性在哪里？它们没有映射。我应该如何映射它们？感谢引用链接。我现在正在查看它。我尝试了@MapsId，但它给出了相同的错误：（苏拉布：等等，
auctionParamId
是
null
，因为你没有给它赋值，你还期望它有什么其他行为。还要注意的是，你不能将
@GeneratedValue
与派生标识一起使用。我知道了，我应该自己填充auctionParamId，但当我坚持“拍卖”时，auctionId会怎么样我应该正确获取上次插入拍卖的auctionId？现在错误无法添加或更新子行：外键约束失败（
portaldemo
auction\u param\u values
，约束
auction\u param\u values\u auction\u id\u fk
外键（
auction\u id
）引用
auctions
（
auction\u id
）插入拍卖参数值（拍卖参数值、创建值、最后一次更新值、拍卖参数id、拍卖id）值（？、、？、？）绑定=>[2011-01-12 04:00:00，2011-01-25 22:30:52.493，2011-01-25 22:30:52.493，1，0]查询：InsertObjectQuery（com.eaportal.domain.AuctionParamValue[auctionParamValuePK=com.eaportal.domain.auctionValuePK][auctionId=0，auctionParamId=1]）我不确定在保存auction命令对象时如何将auction_id作为上述查询中最后插入的id：(
@Entity @Table(name = "auctions") 
public class Auction {
    @OneToMany(cascade = CascadeType.ALL, mappedBy = "auction")
    private List<AuctionParamValue> auctionParamValueList;
    ...
}   

@Entity @Table(name = "auction_param_values")
public class AuctionParamValue {
     @EmbeddedId
     protected AuctionParamValuePK auctionParamValuePK;

     @ManyToOne @MapsId("auctionId")
     private Auction auction;

     ...
}