如何在没有@Id的情况下使用spring仓库? [英] How to use spring Repository without @Id?

问题描述

我在整个应用程序中都使用spring CrudRepository. 现在，我还要为没有@Id的@Entity创建一个.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>

推荐答案

JPA要求每个实体都有一个ID.因此，不可以，没有ID的实体是不允许的.

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

您可能想了解有关在数据库端没有ID的情况下JPA如何处理案件的更多信息.

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').

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