获取多个onetoMany关系Hibernate JPA

@Entity
public class Student {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
    private String name;

    @OneToMany(mappedBy = "student", cascade = CascadeType.ALL)
    private List<Course> courses = new ArrayList<>();

    // 其他 getter 和 setter 方法
}

@Entity
public class Course {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
    private String name;

    @ManyToOne
    @JoinColumn(name = "student_id")
    private Student student;

    // 其他 getter 和 setter 方法
}

String jpql = "SELECT s FROM Student s JOIN FETCH s.courses";
TypedQuery<Student> query = entityManager.createQuery(jpql, Student.class);
List<Student> students = query.getResultList();

Student student = new Student();
student.setName("John Doe");

Course course = new Course();
course.setName("Java Programming");
course.setStudent(student);

student.getCourses().add(course);

entityManager.persist(student);
entityManager.persist(course);