Hibernate：将实体作为列表映射到两个或更多个其他实体(Hibernate: Mapping entity as list to two or more another entities)

Hibernate：将实体作为列表映射到两个或更多个其他实体(Hibernate: Mapping entity as list to two or more another entities) @Entity class Item { ... } @Entity class Character { ... @OneToMany public List<Item> getItems() { ... } } @Entity class Bank { ... @OneToMany public List<Item> getItems() { ... } }

我想为一个具有DTYPE字段{Characters，Bank}和ID的Item实体创建一个表。 我该怎么做这种映射？ 有任何想法吗？

提前致谢。

@Entity class Item { ... } @Entity class Character { ... @OneToMany public List<Item> getItems() { ... } } @Entity class Bank { ... @OneToMany public List<Item> getItems() { ... } }

I want to have one table for an Item entities with DTYPE field {Characters,Bank} and ID filed. How can I do such kind of mapping? Any ideas?

Thanks in advance.

最满意答案

你应该使用@DiscriminatorColumn() 在这里阅读它（第2.2.4.2节）

Well, I've found solution - @WhereJoinTable.

@Entity class Item { ... } @Entity class Character { ... @OneToMany .. @WhereJoinTable(clause="DTYPE = 'Character'") public List<Item> getItems() { ... } } @Entity class Bank { ... @OneToMany .. @WhereJoinTable(clause="DTYPE = 'Bank'") public List<Item> getItems() { ... } }

Of course don't forget about @JoinTable.