嵌套embeddable-AttributeOverride用于embeddable中的embeddable

小编典典

嵌套embeddable-AttributeOverride用于embeddable中的embeddable

hibernate

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：

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;

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？

阅读 387

2020-06-20

共1个答案

小编典典

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！！！！！

2020-06-20