JPA 使用主键而不是外键生成的连接表

Question

Well I have a OneToMany unidirectionnal relationship between TeamEntity and ContestTypeEntity .

So in my TeamEntity I have the following:

@OneToMany(targetEntity = ContestTypeEntity.class)
@JoinTable(name="team_contest_type")
private Set<ContestTypeEntity> contestTypes = new HashSet<>();

ContestTypeEntity doesn't know about the relation.

Normally, JPA should generate a join table team_contest_type with two foreign keys: team_entity_id and contest_types_id .

But in the join table actually generated, those are primary keys, so I'm not able to insert not unique values... And that's what I want to do. How can I fix this?

Answer 1

Use @JoinColumn instead of @JoinTable . And remember that when working with JPA/Hibernate/ORM you are working with object references, not with table keys. This can help you not to use unidirectional with OneToMany: https://thorben-janssen.com/best-practices-many-one-one-many-associations-mappings/#Don8217t_use_unidirectional_one-to-many_associations

Answer 2

Ok so a ManyToMany relation with a Set on both sides solved my problem.