休眠和无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

我发现它不可能这样做。

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），表将创建两个Java类，一个Entity和有一个字段; id，以及一个包含您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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