Hibernate：集合的集合

问题描述

这是我一直遇到的问题：

This is a problem I keep on running into:

我想让hibernate管理一个代表集合集合的表。例如：

I would like to have hibernate manage a single table that represents a collection of collections. For example:

• 地图地图


• 集合列表


• 地图列表

例如，我想能够代表：

class OwningClass {
    Long entityId;
    Map<String, List<Element>> mapOfLists;
}

class Element {
    String data_1;
    boolean data_2;
}

作为单个表：

OWNER (Foreign key to the owner of this element)
MAP_KEY (varchar(30) )
LIST_INDEX (int)
ELEMENT_DATA_1 (varchar(1020)
ELEMENT_DATA_2 (bit)

没有自定义的hibernate代码似乎不可能，我不介意，但我希望有人有一些

It doesn't seem possible without a custom hibernate code, which I don't mind. But I was hoping someone had some guidance on what that custom code should look like.

• 我应该如何扩展AbstractPersistentCollection？


• CompositeUserType？

可以管理多个表是否正确，但显然从数据库角度来看是不行的。

Its possible to manage if multiple tables are o.k. but obviously that is lame from the db perspective.

推荐答案

在网站上的其他地方找到答案:-)

Found the answer elsewhere on the site :-) Multimap in Hibernate

它指向：

尚未调查该博客文章中的解决方案，但看起来它正在回答我的问题。

Haven't investigated the solution in the blog post yet but looks like it is answering exactly my issue.

这篇关于Hibernate：集合的集合的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！