Java JPA：@PrimaryKeyJoinColumn(...) 和 @JoinColumn(..., insertable = ?, updatable = ?) 一样吗？
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JPA: is @PrimaryKeyJoinColumn(...) the same as @JoinColumn(..., insertable = ?, updatable = ?)?
提问by Kawu
Can you derive from the JPA spec, if @PrimaryKeyJoinColumn(...), which doesn't have the insertable and updatable parameters, is the same as
您能否从 JPA 规范中推导出@PrimaryKeyJoinColumn(...)没有可插入和可更新参数的if与
@JoinColumn(..., insertable = false, updatable = false)
or
或者
@JoinColumn(..., insertable = true, updatable = true)
@JoinColumn(..., 可插入 = 真, 可更新 = 真)
when used on regular (non-inheritance) associations? Should they be interchangable? What are the insertable and updatable properties set to? Are they set to anything at all? Note, I'm only targeting the read-only attribute that both (seem to) implement...
何时用于常规（非继承）关联？它们应该可以互换吗？可插入和可更新属性设置为什么？他们有没有设置任何东西？请注意，我只针对两者（似乎）实现的只读属性......
I'm getting rather inconsistent mapping exception with EclipseLink and Hibernate...
我在使用 EclipseLink 和 Hibernate 时遇到了相当不一致的映射异常...
Here's the @PrimaryKeyJoinColumnJavaEE 5 + 6 Javadoc:
这是@PrimaryKeyJoinColumnJavaEE 5 + 6 Javadoc：
PrimaryKeyJoinColumn (JavaEE 5)
PrimaryKeyJoinColumn (JavaEE 6)
PrimaryKeyJoinColumn (JavaEE 5)
PrimaryKeyJoinColumn (JavaEE 6)
Quote:
引用：
... and it may be used in a OneToOne mapping in which the primary key of the referencing entity is used as a foreign key to the referenced entity.
...并且它可以用在 OneToOne 映射中，其中引用实体的主键用作被引用实体的外键。
采纳答案by James
Yes, the two are equivalent.
是的，两者是等价的。
Note in JPA 2.0 you can also add an @Idto a @OneToOnemapping and avoid having the duplicate basic id attribute altogether.
请注意，在 JPA 2.0 中，您还可以@Id向@OneToOne映射添加 ，并完全避免具有重复的基本 id 属性。
See
看
- Identity and Sequencing > Primary Keys through OneToOne and ManyToOne Relationshipsand
- OneToOne > Target Foreign Keys, Primary Key Join Columns, Cascade Primary Keys
from the WikiBooks Java Persistencepages
