Spring JPA/Hibernate:如何在非主列上映射多态关系 [英] Spring JPA/ Hibernate : How to map polymorphic relation on non primary columns

问题描述

class B{
@Any(metaColumn = @Column(name = "ITEM_TYPE"))
@AnyMetaDef(idType = "long", metaType = "string",
        metaValues = {
                @MetaValue(targetEntity = A.class, value = "A")
        })
@Cascade( { org.hibernate.annotations.CascadeType.ALL})
@JoinColumn(name = "ITEM_ID")
private A a;
...
...
}

我正在尝试连接表A和表B where B.item_type ='A'是恒定和B.item_id= A.id.

它把我扔了

Caused by: org.hibernate.MappingException: Foreign key (FKi1uuph2wrvxtx66s7n7i1s09a:B [item_type,item_id])) must have same number of columns as the referenced primary key (A [id])

有关如何使用Spring JPA和Hibernate进行映射的任何帮助?

Any help on How shall i map this using spring jpa and hibernate?

推荐答案

我可以通过另一种方法来解决此问题，在该方法中，我将关联实体设置为@Transient，然后将其保存在父实体的@PostPersist调用中通过添加EntityListener类.

I was able to fix this by a alternate approach where I made the associated entity as @Transient and then I saved that transient entity on @PostPersist call from parent entity by adding an EntityListener class.

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