Hibernate - 外键而不是实体 [英] Hibernate - Foreign keys instead of Entities

问题描述

目前，Hibernate 允许我直接使用

Currently, Hibernate allows me to load objects defined by *-to-one relationships directly with

entity1.getEntity2()

是否可以获取外键而不是对象?

Is it possible to get the foreign key instead of the object?

我看到的当前方法是添加到我的映射中:

The current approach which I see is having addint to my mapping:

@JoinColumn(name="message_key")
@ManyToOne(targetEntity=Message.class,fetch=FetchType.LAZY)
private Message message;  //these lines currently exist

@Column(name="message_key")
private Long message_fk; //the idea is to add those 2 lines

有没有更好的方法来获取外键，还是只有这个?

Is there a better approach to get the foreign key, or is this the only one?

推荐答案

是的，您可以这样做.您只需要为 hibernate 明确哪个是它应该维护的映射，如下所示:

Yes, you can do that. You just need to make it clear for hibernate which one is the mapping that it's supposed to maintain, like so:

@Column(name="message_key", updatable=false, insertable=false)
private Long message_fk;

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