我在整个应用程序中使用 spring CrudRepository
.现在我还想为没有 @Id
的 @Entity
创建一个.这可能吗?
I'm using spring CrudRepository
throughout my application.
Now I want to also create one for an @Entity
that does not have an @Id
. Is that possible at all?
//probably ID is always required?
public interface Repository<T, ID extends Serializable>
JPA 要求每个实体都有一个 ID.所以不,不允许没有 ID 的实体.
JPA requires that every entity has an ID. So no, entity w/o an ID is not allowed.
每个 JPA 实体都必须有一个主键.
Every JPA entity must have a primary key.
来自 JPA 规范
您可能想了解更多关于当数据库端没有 id 时 JPA 如何处理案例 从这里(参见无主键").
You may want to read more about how JPA handles a case when there's no id on the DB side from here (see 'No Primary Key').
这篇关于如何在没有@Id的情况下使用spring Repository?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持跟版网!