休眠且无PK [英] Hibernate and no PK

问题描述

是否可以创建一个不包含主键/Id 的表(来自 JPA 注释的 Hibernate @Entity)?

Is it possible to create a table (from a JPA annotated Hibernate @Entity) that does not contain a primary key / Id?

我知道这不是一个好主意；一个表应该有一个主键.

I know this is not a good idea; a table should have a primary key.

推荐答案

我发现这是不可能的.那些使用遗留系统的人真不幸.

I found that its not possible to do so. So bad luck for those working with legacy systems.

如果您进行逆向工程(从现有 JDBC 连接创建 JPA 注释实体)，该表将创建两个 Java 类，一个实体和一个字段；id，以及一个包含关系中所有列的可嵌入 id.

If you reverse engineer (create JPA annotated entities from existing JDBC connection) the table will create two Java classes, one Entity and with one field; id, and one embeddable id containing all the columns from your relation.

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