Spring Boot | How do I update / save extra attributes in a ManyToMany junction table?-CodePudding

So I've been recently creating a ManyToMany Table with custom attributes in Spring Boot. There are the usual 2 foreign keys in it and extra simple attributes as two Longs. The middle table is getting filled as it should, but how do I also manually/programmically set these values.

My ManyToMany Table looks as following:

@Getter
@Setter
@NoArgsConstructor
@Entity(name = "StudentCourseEntity")
@Table(name = "student_courses")
public class StudentCourses implements Serializable {

    @EmbeddedId
    private StudentCourseId studentCourseId;

    @Column
    private Long level;

    @Column
    private Long position;
}

The @EmbeddedId -> StudentCourseId class just has both foreign keys in it. Is it even possible with this ManyToMany variation of just "overwriting" the auto generated ManyToMany table as I did in the example above?

My Student and Course entities don't have a reference on this StudentCourses class, they still have the @ManyToMany implementation to each other.

I'm looking forward for useful answers, thanks guys!

CodePudding user response：

You have to create an entity of Join Table and add extra fields according to your need. Refer here for complete information.