嵌套可嵌入 - AttributeOverride可嵌入嵌入 [英] Nested embeddable - AttributeOverride for embeddable within embeddable

问题描述

我有class Money，它是@Embeddable

  @Embeddable 
 public class Money实现了Serializable，Comparable<金钱与GT; {
 @Column（name =amount，precision = 15，scale = 2）
 private BigDecimal amount; 
} 
  

当我在实体内使用多次时，一切正常。例如

  @Entity 
公共类SomeEntity实现了Serializable {
 
 @Embedded 
 @AttributeOverride（name =amount，column = @Column（name =entry））
 private Money entryValue; 
 
 @Embedded 
 @AttributeOverride（name =amount，column = @Column（name =leave））
 private money leaveValue; 
} 
  

上面的代码完美无瑕。

现在，当我有另一个@Embeddable时，就会出现问题，我想在其中有Money实例，并且@Embeddable被实体多次使用。示例：

1. 可嵌入
   
   

     @Embeddable 
    public class ReportCostValues implements Serializable {
    
    @Embedded 
    @AttributeOverride（name =amount，column = @Column（name =covered_by_grant））
   私人资金包含在内; 
    
    @Embedded 
    @AttributeOverride（name =amount，column = @Column（name =own_resources））
    private Money createdFromOwnResources; 
    
    @Embedded 
    @AttributeOverride（name =amount，column = @Column（name =personal_contribution））
    private Money personalContribution; 
     




2. 实体

     @Entity 
    public class ReportCostEntity implements可识别的< Long> ;,可序列化的{
    
    @Id 
    private Long id; 
    
    @Embedded 
   私人ReportCostValues合约; 
    
    @Embedded 
   私人ReportCostValues当前; 
    
    @Embedded 
    private ReportCostValues previousReport; 
     

以上代码无效。任何想法如何解决这个问题？

解决方案

您好，您必须使用 @AttributeOverrides 在司法上，你必须在实体中重新覆盖属性，你可以嵌入 ReportCostValues 类，希望下面的代码是你正在寻找的。

  @Entity 
 public class ReportCostEntity implements Serializable {
 
 @Id 
 private Long id; 
 $ b @Embedded 
 @AttributeOverrides（{
 @AttributeOverride（name =coveredByGrant.amount，column = @Column（name =contracted_coveredByGrant）），
 @AttributeOverride（name =ownedContribution.amount，column = @Column（name =contracted_personalContribution）@AttributeOverride（name =foundedFromOwnResources.amount，column = @Column（name =contracted_foundedFromOwnResources）），
 ）
}）
私人ReportCostValues合约; 
 $ b @Embedded 
 @AttributeOverrides（{
 @AttributeOverride（name =coveredByGrant.amount，column = @Column（name =current_coveredByGrant）），
 @AttributeOverride（name =discoveredFromOwnResources.amount，column = @Column（name =current_foundedFromOwnResources）），
 @AttributeOverride（name =personalContribution.amount，column = @Column（name =current_personalContribution）） ）
}）
私人ReportCostValues当前; 
 $ b @Embedded 
 @AttributeOverrides（{
 @AttributeOverride（name =coveredByGrant.amount，column = @Column（name =previousReport_coveredByGrant）），
 @AttributeOverride（name =ownedContribution.amount，column = @Column（name =previousReport_personalContribution）@AttributeOverride（name =foundedFromOwnResources.amount，column = @Column（name =previousReport_foundedFromOwnResources）），
 ）
}）
 private ReportCostValues previousReport; 
 
 
 
 $ b} 
  

希望这有助于!!!!!

I have class Money which is an @Embeddable

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

When I useit multiple time inside entity, everything works fine. For example

@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;
}

Code above works perfectly.

Now the problem occurs when I have another @Embeddable that I want to have Money instances in it and that @Embeddable is used by an entity multiple times. Example:

1. Embeddable

   @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. Entity

    @Entity
    public class ReportCostEntity implements Identifiable<Long>, Serializable {
   
       @Id
       private Long id;
   
       @Embedded       
       private ReportCostValues contracted;
   
       @Embedded       
       private ReportCostValues current;
   
       @Embedded        
       private ReportCostValues previousReport;
   

This code above will not work. Any ideas how to approach this problem?

解决方案

Hi you have to use @AttributeOverrides judicially,you have to override attributes once again in entity that you have done in embeddable ReportCostValues class, hope code below is what you are looking for.

@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;




} 

Hope this helps !!!!!

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