33hibernate_fetch_4_set_join

hibernate抓取策略（集合代理的批量抓取）

设置fetch="join",如：
<set name="students" inverse="true" cascade="all" fetch="join">

fetch="join",hibernate会通过select语句使用外连接来加载其关联实体或集合

此时lazy会失效
============================================================================================
    public void testFetch1() {
        Session session = null;
        try {
            session = HibernateUtils.getSession();
            session.beginTransaction();
            Classes classes = (Classes)session.load(Classes.class, 1);
            System.out.println("classes.name=" + classes.getName());
            for (Iterator iter=classes.getStudents().iterator(); iter.hasNext();) {
                Student student = (Student)iter.next();
                System.out.println("student.name=" + student.getName());
            }
            session.getTransaction().commit();
        }catch(Exception e) {
            e.printStackTrace();
            session.getTransaction().rollback();
        }finally {
            HibernateUtils.closeSession(session);
        }
    }    
测试结果：
Hibernate: select classes0_.id as id0_1_, classes0_.name as name0_1_, students1_.classesid as classesid3_, students1_.id as id3_, students1_.id as id1_0_, students1_.name as name1_0_, students1_.classesid as classesid1_0_ from t_classes classes0_ left outer join t_student students1_ on classes0_.id=students1_.classesid where classes0_.id=?
classes.name=班级0
student.name=班级0的学生0
student.name=班级0的学生5
student.name=班级0的学生3
student.name=班级0的学生1
student.name=班级0的学生2
student.name=班级0的学生4
student.name=班级0的学生6

-------------------------0 5 3 1 2 4 6----------------------------------------------------

因为是set，所以是无序的： 
Hibernate: select classes0_.id as id0_1_, classes0_.name as name0_1_, students1_.classesid as classesid3_, students1_.id as id3_, students1_.id as id1_0_, students1_.name as name1_0_, students1_.classesid as classesid1_0_ from t_classes classes0_ left outer join t_student students1_ on classes0_.id=students1_.classesid where classes0_.id=?
classes.name=班级0
student.name=班级0的学生3
student.name=班级0的学生6
student.name=班级0的学生1
student.name=班级0的学生2
student.name=班级0的学生5
student.name=班级0的学生0
student.name=班级0的学生4

------------------------- 3  6 1 2 5 0  4-------------------------------------------------