JPA与同一实体的多对多关系，带有额外的列

Question

Im facing an issue with The following:

public class Person {

    private long id;
    private String name;
    private List<Relation> relations;
    ....
}

public class Relation {

     private Person person;
     private Person relatedWith;
     private String relationType;
}

The goal is to annotate these classes with JPA so any given person can have a relation with any other person.(thus manytomany) The relation table should have a combined primary key consisting of the person.id and the relatedWith.id .

How can i do this? Thanks for your help! Richard

Answer 1

您不应使用组合的主键，而应使用生成的主键（例如，关系表的序列或自动增量列），然后将有两个外键返回到Person表。