31hibernate_fetch_2_join

hibernate抓取策略（单端代理的批量抓取）

设置fetch="join",如：
<many-to-one name="classes" column="classesid" 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();
            
            Student student = (Student)session.load(Student.class, 1);
            System.out.println("student.name=" + student.getName());
            System.out.println("classes.name=" + student.getClasses().getName());
            session.getTransaction().commit();
        }catch(Exception e) {
            e.printStackTrace();
            session.getTransaction().rollback();
        }finally {
            HibernateUtils.closeSession(session);
        }
    }    
测试结果：
Hibernate: select student0_.id as id1_1_, student0_.name as name1_1_, student0_.classesid as classesid1_1_, classes1_.id as id0_0_, classes1_.name as name0_0_ from t_student student0_ left outer join t_classes classes1_ on student0_.classesid=classes1_.id where student0_.id=?
student.name=班级0的学生0
classes.name=班级0