Java 如何命名自 JPA 2.1 以来 ManyToOne 引用的外键约束？
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How to name the foreign key constraint of ManyToOne references since JPA 2.1?
提问by membersound
@org.hibernate.annotations.ForeignKeyhas been deprecated, but I cannot find any examples how the JPA 2.1 equivalent would have to look like?
@org.hibernate.annotations.ForeignKey已被弃用，但我找不到任何示例 JPA 2.1 等价物会是什么样子？
@ManyToOne
@ForeignKey(name = "FK_USER") //@deprecated Prefer the JPA 2.1 introduced {@link javax.persistence.ForeignKey} instead.
private User user;
How is this to be implemented without the deprecated annotation?
在没有弃用注释的情况下如何实现？
采纳答案by JB Nizet
As the documentationindicates, this annotation can't be applied to anything:
正如文档所示，此注释不能应用于任何内容：
@Target(value={})
@目标（值={}）
It can thus only be used as part of another annotation (listed in the See Alsosection):
因此，它只能用作另一个注释的一部分（在另请参阅部分中列出）：
@JoinColumn(foreignKey = @ForeignKey(name = "FK_USER"))
回答by Blekit
You're right, I misread the documentation. It can be defined as a part of @JoinColumnannotation.
你是对的，我误读了文档。它可以定义为@JoinColumn注解的一部分。
It should look like that:
它应该是这样的：
@JoinColumn(foreignKey = @ForeignKey(name = "FK_USER"))
回答by Robert Danilo
Do you insert @JoinColumn(foreignKey = @ForeignKey(name = "FK_USER"))direct to mapped to entity example:
您是否插入@JoinColumn(foreignKey = @ForeignKey(name = "FK_USER"))直接映射到实体示例：
@ManyToOne
@JoinColumn(foreignKey = @ForeignKey(name = "FK_USER"))
private User user;
