Hibernate映射子类中的第二个@Embeddable字段

Question

我正在尝试在子类中映射@Embeddable对象,其父类已经具有@Embeddable类型的字段.

hibernate Embeddable Objects文档声称我可以使用@AttributeOverrides来覆盖@Embeddable对象的列名:

例如

@Entity
public class Person implements Serializable {

    // Persistent component using defaults
    Address homeAddress;

    @Embedded
    @AttributeOverrides( {
            @AttributeOverride(name="iso2", column = @Column(name="bornIso2") ),
            @AttributeOverride(name="name", column = @Column(name="bornCountryName") )
    } )
    Country bornIn;
    ...
}

这是我的情况:

 @Embeddable
    public class ContentID implements Serializable {
        @Column(name="contentID")
        private String contentPath;
    }

   @MappedSuperclass
   public abstract class BaseDomainObject implements Serializable  {

       @Embedded
       private ContentID contentID;
    }

public class Achievement extends BaseDomainObject {

    @Embedded
    @AttributeOverrides( {
        @AttributeOverride(name="contentID", column = @Column(name="awardedItem") ),
    } )
    private ContentID awardedItem;
}   

我得到的错误是:

org.hibernate.MappingException:在对实体映射重复柱:成就柱:内容识别(应当与插入物被映射="假"更新="假")在org.hibernate.mapping.PersistentClass.checkColumnDuplication(PersistentClass.java:652)在org.hibernate.mapping.PersistentClass.checkPropertyColumnDuplication(PersistentClass.java:674)在org.hibernate.mapping.PersistentClass.checkPropertyColumnDuplication(PersistentClass.java:670)在org.hibernate.mapping.PersistentClass.checkColumnDuplication(PersistentClass.java:696 )在org.hibernate.mapping.PersistentClass.validate(PersistentClass.java:450)在org.hibernate.mapping.SingleTableSubclass.validate(SingleTableSubclass.java:43)在org.hibernate.cfg.Configuration.validate(Configuration.java: 1108)在org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1293)在org.hibernate.cfg.AnnotationConfiguration.buildSessionFactory(AnnotationConfiguration.java:867)

更新:

我查找了与此相关的Hibernate问题,GRAILS项目声称他们已经修复了这个问题但是他们的注释解决方案似乎不是有效的javax.persistence注释(也许它是一个新版本).

JPA @ Embeddable/@ Embedded throws org.hibernate.MappingException:实体映射中的重复列

Answer 1

问题似乎是这样的:

 public class ContentID implements Serializable {
    @Column(name="contentID")
    private String contentPath;
}

您正在将contentPath列名称设置为"contentId",并且稍后会与您的AttributeOverride注释发生冲突.

试试这个:

public class ContentID implements Serializable {
    @Column(name="contentPath")
    private String contentPath;
}

更新 我也想知道这个:

@Embedded
@AttributeOverrides( {
    @AttributeOverride(name="contentID", column = @Column(name="awardedItem") ),
} )
private ContentID awardedItem;

您似乎将contentId列的名称更改为awardsItem.这真的有必要吗？