嵌套embeddable-AttributeOverride用于embeddable中的embeddable

Question

我有班钱是@Embeddable

@Embeddable
public class Money implements Serializable, Comparable<Money> {
    @Column(name = "amount", precision = 15, scale = 2)
    private BigDecimal amount;
}

当我在实体中多次使用它时，一切正常。例如

@Entity
public class SomeEntity implements Serializable {

    @Embedded
    @AttributeOverride(name = "amount", column = @Column(name = "entry"))
    private Money entryValue;

    @Embedded
    @AttributeOverride(name = "amount", column = @Column(name = "leave"))
    private Money leaveValue;
}

上面的代码完美地工作。

现在，当我有另一个@Embeddable想要在其中包含Money实例并且该@Embeddable被实体多次使用时，就会出现问题。例：

1. 可嵌入

   @Embeddable
   

   public class ReportCostValues implements Serializable {

   @Embedded
   @AttributeOverride(name = "amount", column = @Column(name = "covered_by_grant"))
   private Money coveredByGrant;
   
   @Embedded
   @AttributeOverride(name = "amount", column = @Column(name = "own_resources"))
   private Money foundedFromOwnResources;
   
   @Embedded
   @AttributeOverride(name = "amount", column = @Column(name = "personal_contribution"))
   private Money personalContribution;
   

2. 实体

    @Entity
   

   public class ReportCostEntity implements Identifiable , Serializable {

   @Id
   private Long id;
   
   @Embedded       
   private ReportCostValues contracted;
   
   @Embedded       
   private ReportCostValues current;
   
   @Embedded        
   private ReportCostValues previousReport;
   

上面的这段代码不起作用。任何想法如何解决这个问题？

Answer 1

嗨，您必须@AttributeOverrides司法使用，您必须在可嵌入ReportCostValues类中完成的实体中再次覆盖属性，希望下面的代码是您想要的。

@Entity 
public class ReportCostEntity implements  Serializable {

    @Id
    private Long id;

    @Embedded   
    @AttributeOverrides( {
        @AttributeOverride(name="coveredByGrant.amount", column = @Column(name="contracted_coveredByGrant") ),
        @AttributeOverride(name="foundedFromOwnResources.amount", column = @Column(name="contracted_foundedFromOwnResources")),
        @AttributeOverride(name="personalContribution.amount", column = @Column(name="contracted_personalContribution"))
    } )
    private ReportCostValues contracted;

    @Embedded
    @AttributeOverrides( {
        @AttributeOverride(name="coveredByGrant.amount", column = @Column(name="current_coveredByGrant") ),
        @AttributeOverride(name="foundedFromOwnResources.amount", column = @Column(name="current_foundedFromOwnResources")),
        @AttributeOverride(name="personalContribution.amount", column = @Column(name="current_personalContribution"))
    } )
    private ReportCostValues current;

    @Embedded 
    @AttributeOverrides( {
        @AttributeOverride(name="coveredByGrant.amount", column = @Column(name="previousReport_coveredByGrant") ),
        @AttributeOverride(name="foundedFromOwnResources.amount", column = @Column(name="previousReport_foundedFromOwnResources")),
        @AttributeOverride(name="personalContribution.amount", column = @Column(name="previousReport_personalContribution"))
    } )
    private ReportCostValues previousReport;




}

希望这可以帮助 ！！！！！