这个问题的标题很矛盾，因为我试图在非关系数据库中实现关系…:)
但我的意思是，如何在使用MongoDB的应用程序模型类中使用define associations between entities.
在使用JPA时，我经常使用@ManyToMany或@OneToMany个注释来定义对象之间的关系.Spring Data MongoDB中有类似的东西吗？
在研究MongoDB时，我意识到有两种可能的联系方式:References和Embedded Data.
Spring数据使用哪一个？是否可以配置关联模式？
可以使用@DBRef注释将引用的类持久化到单独的集合中，否则该文档将持久化到同一个文档(json)中.
@DBRef - applied at the field to indicate it is to be stored using a com.mongodb.DBRef.
7.3.4 Using DBRefs The mapping framework doesn't have to store child objects embedded within the document. You can also store them separately and use a DBRef to refer to that document. When the object is loaded from MongoDB, those references will be eagerly resolved and you will get back a mapped object that looks the same as if it had been stored embedded within your master document.