如何从联接表中为其他属性创建多对多 Hibernate Mapping？

你需要使用

@EmbeddedId

@Embeddable

讲师班：

@Entity@Table(name="LECTURER")public class Lecturer {@oneToMany(fetch = FetchType.LAZY, mappedBy = "pk.lecturer", cascade=CascadeType.ALL)Set<LecturerCourse> lecturerCourses == new HashSet<LecturerCourse>();//all others properties Setters and getters are less relevant.}

课程类别：

@Entity@Table(name="COURSE")public class Course {@oneToMany(fetch = FetchType.LAZY, mappedBy = "pk.course", cascade=CascadeType.ALL)Set<LecturerCourse> lecturerCourses == new HashSet<LecturerCourse>();//all others properties Setters and getters are less relevant.}

讲师课程：

@Entity@Table(name = "lecturer_course")@AssociationOverrides({        @AssociationOverride(name = "pk.lecturer",  joinColumns = @JoinColumn(name = "LECTURER_ID")),        @AssociationOverride(name = "pk.course",  joinColumns = @JoinColumn(name = "COURSE_ID")) })public class LecturerCourse {    private LecturerCourseID pk = new LecturerCourseID();    @Column(name = "CAPACITY", nullable = false, length = 10)    private String capacity;    @EmbeddedId    public LecturerCourseID getPk() {        return pk;    }}

现在，主键：

@Embeddablepublic class LecturerCourseID implements java.io.Serializable {    private Lecturer lecturer;    private Course course;    @ManyToOne    public Stock getLecturer() {        return lecturer;    }    public void setLecturer(Lecturer lecturer) {        this.lecturer= lecturer;    }    @ManyToOne    public Course getCourse() {        return course;    }    public void setCourse(Course course) {        this.course= course;    }}

现在，你的Main应该是这样的：

Lecturer lecturer1 = new Lecturer();Course math = new Course();LecturerCourse lecturer1math  = new LecturerCourse();lecturer1math.setCapacity("capacity");lecturer1math.setLecturer(lecturer1);lecturer1math.setCourse(math);lecturer1.getLecturerCourses().add(lecturer1math);//saving objectsession.save(lecturer1);

你需要确保标记为的类

@Embeddable

Serializable

希望能帮助到你。