[英]How to map @OneToMany to a java.util.Map with custom keys?
class A{
private List<B> bs;
...
}
class B{
private Long id;
private String name;
...
}
And I'd like to have this: 我想要这个:
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;
...
}
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. 我不知道我是否清楚我想做什么,但它就像将一个到多个关系映射到一个名为B的Map作为地图的关键字一样简单。
Thanks in advance, Neuquino 在此先感谢Neuquino
Try the hibernate annotation MapKey 尝试使用hibernate注释MapKey
@MapKey(name = "name")
@OneToMany()
private Map<String,B> bs;
Google Collections has a class with this facility. Google Collections有一个这个设施的课程。 Try it. 试试吧。
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