30hibernate_fetch_1_select

hibernate抓取策略（单端代理的批量抓取）

保持默认（也就是说什么也不配），同fetch="select",如：
<many-to-one name="classes" column="classesid" fetch="select"/>

fetch="select",另外发送一条select语句抓取当前对象关联实体或集合

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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);
        }
    }    
ExportDB:
create table t_classes (id integer not null auto_increment, name varchar(255), primary key (id))
create table t_student (id integer not null auto_increment, name varchar(255), classesid integer, primary key (id))
alter table t_student add index FK4B9075708EBC77F7 (classesid), add constraint FK4B9075708EBC77F7 foreign key (classesid) references t_classes (id)


/30hibernate_fetch_1/src/com/bjsxt/hibernate/Student.hbm.xml
<many-to-one name="classes" column="classesid" fetch="select"/>
测试结果：发二条
Hibernate: select student0_.id as id1_0_, student0_.name as name1_0_, student0_.classesid as classesid1_0_ from t_student student0_ where student0_.id=?
student.name=班级0的学生0
Hibernate: select classes0_.id as id0_0_, classes0_.name as name0_0_ from t_classes classes0_ where classes0_.id=?
classes.name=班级0