Question

我有类Money，这是一个@Embeddable

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

当我在实体内部使用多次时，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;
}

上面的代码完美无缺。

现在问题出现了，当我有另一个@Embeddable，我希望在其中有Money实例，并且实体多次使用@Embeddable。例如：

嵌入式

@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;

实体

 @Entity
 public class ReportCostEntity implements Identifiable<Long>, Serializable {

    @Id
    private Long id;

    @Embedded       
    private ReportCostValues contracted;

    @Embedded       
    private ReportCostValues current;

    @Embedded        
    private ReportCostValues previousReport;

上面的代码不起作用。任何想法如何处理这个问题？

Answer 1

嗨，你必须在司法上使用@AttributeOverrides，你必须在你在embeddable ReportCostValues类中完成的实体中再次覆盖属性，希望下面的代码是你正在寻找的。

@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;




}

希望这有助于!!!!!

嵌套嵌入式 - AttributeOverride，用于嵌入嵌入式嵌入式

1 个答案: