studentdao.java

Hibernate开发及整合应用大全 蔡雪焘编著 本书用典型的示例剖析Hibernate开发中的重点和难点

/*
 * 创建日期 2005-7-2
 *
 * TODO 要更改此生成的文件的模板，请转至
 * 窗口 － 首选项 － Java － 代码样式 － 代码模板
 */
package persistence;

import java.util.List;

import model.Student;
import model.Team;

import org.hibernate.FlushMode;
import org.hibernate.Hibernate;
import org.hibernate.HibernateException;
import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.Transaction;

/**
 * @author Administrator
 * 
 * TODO 要更改此生成的类型注释的模板，请转至 窗口 － 首选项 － Java － 代码样式 － 代码模板
 */
public class StudentDAO extends BaseDAO{
    static Session session=null;
    static Transaction tx=null;

	/*------------取得所有的学生列表-----------------*/
	public static List getAllStu() {
		List list=null;
		try {
			session = HibernateUtil.currentSession(); //开启连接
			tx = session.beginTransaction(); //开启事务
			Query q=session.createQuery("from Student as s left join   s.team ");
			list=q.list();
//			Student stu=(Student) list.get(0);
//			Object stuAndTeam1[]=(Object[]) list.get(0);
//			Student stu=(Student) stuAndTeam1[0];
//			System.out.println(stu.getName());
//			System.out.println(stu.getTeam().getTeamName());
			tx.commit();

		} catch (HibernateException e) { //捕捉例外
			e.printStackTrace();
			tx.rollback();
		}finally
		{
			HibernateUtil.closeSession(session);
		}
		return list;

	}
	/*------------取得一个学生-----------------*/
	public static Student getOneStu() {
		Student stu=null;
		try {
			session = HibernateUtil.currentSession(); //开启连接
			session.setFlushMode(FlushMode.AUTO);
			tx = session.beginTransaction(); //开启事务
			stu=(Student) session.get(Student.class,"ff80808105416d3b0105416d3eca0001");
			stu.setAge(11122);
//			session.save(stu);
//			session.evict(stu);
//			stu=(Student) session.get(Student.class,"ff80808105416d3b0105416d3eca0001");

//			stu=(Student) session.get(Student.class,"ff808081054175b501054175b9190001");
			stu= (Student) session.createQuery("from Student s where s.id='ff80808105416d3b0105416d3eca0001'").uniqueResult();
//			List list= session.createQuery("from Student").list();
//			Student s=(Student) list.get(1);
			System.out.println(stu.getAge());
//			Team team=stu.getTeam();
//			System.out.println(stu.getAge());
//			System.out.println(stu2.getAge());
//			Hibernate.initialize(stu.getTeam());
//			Hibernate.initialize(stu.getTeam().getStudents());
//			tx.commit();
//			HibernateUtil.closeSession(session);
//////			
//			session = HibernateUtil.currentSession(); //开启连接
//			tx = session.beginTransaction(); //开启事务
//			stu=(Student) session.get(Student.class,"ff80808105416d3b0105416d3eca0001");
//			System.out.println(stu.getAge());
//			Team team=stu.getTeam();
			
//			session.update(stu.getTeam());
//			Hibernate.initialize(stu.getTeam());
//			Hibernate.initialize(stu.getTeam().getStudents());
//			session.save(stu);
			tx.commit();
			
		} catch (HibernateException e) { //捕捉例外
			e.printStackTrace();
			tx.rollback();
		}finally
		{
			HibernateUtil.closeSession(session);
		}
		return stu;

	}


}