Hibernate@Embeddable类扩展了另一个@Embeddable类，在@OneTomany映射中找不到属性

Question

下面是someownerclass.java的代码片段，它引用了col1和col2

>  @OneToMany(orphanRemoval = true, fetch=FetchType.EAGER)
>        @Cascade(value = {CascadeType.ALL,CascadeType.SAVE_UPDATE})
>        @Fetch(FetchMode.JOIN)
>        @JoinColumns({
>        @JoinColumn(name="COL_1",insertable=false,updatable=false,referencedColumnName="COL_1"),
>        @JoinColumn(name="COL_2",insertable=false,updatable=false,referencedColumnName="COL_2"),
>        @JoinColumn(name="COL_3",insertable=false,updatable=false,referencedColumnName="COL_3"),
>     })    private Set<SomeChildTable> collection = new
> HashSet<SomeChildTable>();

这种情况有什么解决办法吗？

parentPK.java

 @Embeddable
    public class ParentPk implements Serializable  {

        @Column(name="COL_1")
        private String col1;

        @Column(ame="COL_2")
        private String col2;

    }

@Embeddable
public class ChildPk extends ParentPk implements Serializable  {

    @Column(name="COL_3")
    private String col3;
}

@Entity
@Table(name="FOO")
public class SomeOwnerClass implements Serializable  {

    @EmbeddedId
       @AttributeOverrides({@AttributeOverride(name="col1", column=@Column(name="COL_1",length=38))})
        private ChildPk childPk = new ChildPk();

         @OneToMany(orphanRemoval = true, fetch=FetchType.EAGER)
         @Cascade(value = {CascadeType.ALL,CascadeType.SAVE_UPDATE})
         @Fetch(FetchMode.JOIN)
         @JoinColumns({
         @JoinColumn(name="COL_1",insertable=false,updatable=false,referencedColumnName="COL_1"),
         @JoinColumn(name="COL_2",insertable=false,updatable=false,referencedColumnName="COL_2"),
         @JoinColumn(name="COL_3",insertable=false,updatable=false,referencedColumnName="COL_3"),
      })
    private Set<SomeChildTable> collection = new HashSet<SomeChildTable>();
}

org.hibernate.MappingException: Unable to find column with logical name: COL_1 in SomeOwnerClass
    at org.hibernate.cfg.Ejb3JoinColumn.checkReferencedColumnsType(Ejb3JoinColumn.java:587)
    at org.hibernate.cfg.BinderHelper.createSyntheticPropertyReference(BinderHelper.java:258)
    at org.hibernate.cfg.annotations.CollectionBinder.bindCollectionSecondPass(CollectionBinder.java:1451)
    at org.hibernate.cfg.annotations.CollectionBinder.bindOneToManySecondPass(CollectionBinder.java:864)
    at org.hibernate.cfg.annotations.CollectionBinder.bindStarToManySecondPass(CollectionBinder.java:779)
    at org.hibernate.cfg.annotations.CollectionBinder$1.secondPass(CollectionBinder.java:728)
    at org.hibernate.cfg.CollectionSecondPass.doSecondPass(CollectionSecondPass.java:70)
    at org.hibernate.cfg.Configuration.originalSecondPassCompile(Configuration.java:1695)
    at org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:1424)
    at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1844)
    at com.foo.mypackage.ParentHibernateUtil.initiateSessionFactory(ParentHibernateUtil.java:112)
    at com.foo.mypackage.ParentHibernateUtil.getSessionFactory(ParentHibernateUtil.java:131)
    at com.foo.mypackage.GenericHibernateDAO.getSession(GenericHibernateDAO.java:36)
    at com.foo.mypackage.GenericHibernateDAO.beginTransaction(GenericHibernateDAO.java:63)
    at com.foo.mypackage.MarsTest.main(MyTest.java:22)

java转换为@embedbable，扩展了parentpk.java

<class name="SomeOwnerClassDetail" table="FOO_DETAIL">

        <composite-id class="ChildPk"
            name="childPk">
            <key-property name="col1" column="COL_1"  type="java.lang.Long"/>
            <key-property name="col2" column="COL_2" length="32"/>
            <key-property name="col3" column="COL_3" length="3"/>
        </composite-id>
    </class>

在上面，映射col1和col2是从parentpk.java继承来的，如果在xml映射中的某个ownerclass.java中使用ChildPk作为外键，但在带注释的映射中不能使用，则可以访问它们。

我不能改变我的类的结构，因为它是遗留应用程序。

<set name="someDetailKey" cascade="all,delete-orphan,save-update" lazy="false" fetch="join"  > 
        <key foreign-key="FOO_Foreign_Key" >
            <column name="COL_1"/>
            <column name="COL_2"/>
            <column name="COL_3"/>
        </key>
        <one-to-many class="ChildPk" />
    </set>

Answer 1

您可以实现@embeddable类之间的继承。您只需用@mappedsuperclass注释父类即可。

因此，例如：

@Embeddable
@MappedSuperclass
public class Parent {
    @Basic
    private String parentProperty;

    // ... getters/setters
}

@Embeddable
public class Child extends Parent {
    @Basic
    private String childProperty;

    // ... getters/setters
}

这样，Hibernate（用5.x测试）将在Child类中正确映射ParentProperty和ChildProperty。