如何使用自定义键将@OneToMany映射到java.util.Map？ [英] How to map @OneToMany to a java.util.Map with custom keys?

问题描述

class A{

  private List<B> bs;

  ...
}

class B{

  private Long id;
  private String name;
  ...
} 

---

我想要这样：

---

And I'd like to have this:

class A{

  // the map should have B.name as key
  private Map<String,B> bs;

  ...
}

class B{
  private Long id;
  private String name;
  private A a;
  ...
} 

---

我不知道我想要做什么，但它很简单，只需将一对多关系映射到地图的名称为B的地图即可。

---

I don't know if it is clear what I'd like to do, but it is as simple as mapping a one to many relationship to a Map with the name of B as the key of the map.

在此先感谢，
Neuquino

Thanks in advance, Neuquino

推荐答案

尝试使用hibernate注释MapKey

Try the hibernate annotation MapKey

@MapKey(name = "name")
@OneToMany()
private Map<String,B> bs;

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