hibernate detached criteria with join table

Question

i have quick question related to hibernate and the use of its detachedcriteria.

Three tables all have their ID individually as the parent key.

The tables are table Course , table Teacher and their join table TeacherCourse . Course and Teacher both have one to many relationship to TeacherCourse.

My question now is how do I get all the unique Courses with a Teacher ID

My current code is like

public static ArrayList<Course> getCoursesByTeacher(Teacher teacher){
    ArrayList<Course> courses = new ArrayList<Course>();
    DetachedCriteria detachedCriteria = DetachedCriteria.forClass(Course.class);
    detachedCriteria.add(Restrictions.eq(Key.TEACHER, teacher));
    detachedCriteria.add(Restrictions.eq(Key.OBJSTATUS, Value.ACTIVED));
    List<Object> list = HibernateUtil.detachedCriteriaReturnList(detachedCriteria);
    for(Object o : list){
        courses.add((Course) o);
    }
    return courses;
}

But the TeacherCourse is missing in between. How do I slot in the teacherCourse and find all the unique courses for a teacher.

Answer 1

JB Nizet give the correct answer, just to make it clearer, here is my solution in my situation:

public static ArrayList<Course> getCoursesByTeacher(Teacher teacher){
    ArrayList<Course> courses = new ArrayList<Course>();
    Session session = HibernateUtil.getSessionFactory().openSession();
    session.beginTransaction();
    List<Object> list = session.createQuery("select c from Course c join c.teacherCourses tc where tc.teacher = :teacher")
            .setParameter("teacher", teacher).list();
    session.getTransaction().commit();
    session.close();
    for(Object o : list){
        courses.add((Course) o);
    }
    return courses;
}