java - hibernate : How to Join 3 tables in one join table by Annotation?

Question

我有一些角色、用户和应用程序我想创建该表的映射 hibernate :

CREATE TABLE role_application_user (
  role_identifier INTEGER not null,
  application_identifier INTEGER not null,
  user_identifier INTEGER not null,
  KEY FK_role_identifier (role_identifier),
  KEY FK_application_identifier(application_identifier),
  KEY FK_user_identifier (user_identifier),
  CONSTRAINT FK_role_identifier FOREIGN KEY (role_identifier) REFERENCES role (identifier),
  CONSTRAINT FK_application_identifier FOREIGN KEY (application_identifier) REFERENCES application (identifier),
  CONSTRAINT FK_user_identifier FOREIGN KEY (user_identifier) REFERENCES users (login)
);

对于应用程序，一个角色可以拥有多个用户，一个用户可以拥有多个角色。

我尝试这个映射:

应用程序.java

@JoinTable(name = "role_application_user",
           joinColumns = @JoinColumn(name = "application_identifier"),
           inverseJoinColumns = @JoinColumn(name = "user_identifier"))
@MapKeyJoinColumn(name = "role_identifier")
@ElementCollection
private Map<Role, User> userByRole = new HashMap<>();

不幸的是，这在我的例子中不起作用，因为在 java 中，Map 的键必须是唯一的。

通过此映射，我们只能让一个用户担任一个角色和一个应用程序。

Answer 1

尝试这个实现:

    @Entity
    public class User {
        @OneToMany
        private List<RoleInApplication> rolesInApplications;
    }
    
    @Entity
    public class Role {
        @OneToMany
        private List<RoleInApplication> rolesInApplications;
    }
    
    @Entity
    public class RoleInApplication {
        @ManyToOne
        private User user;
        @ManyToOne
        private Role role;
        @ManyToOne
        private Application application;
    }
    
    @Entity
    public class Application {
        @OneToMany
        private List<RoleInApplication> rolesInApplications;
    }