hibernate DAO的一般写法

public class DAOImp {
    static Session session=null;
 /*------------创建新的学生对象-----------------*/
 public static void createStu(Student stu) {
  try {
   session = HibernateUtil.currentSession(); //开启连接
   Transaction tx = session.beginTransaction(); //开启事务
   session.save(stu);
   tx.commit();

  } catch (HibernateException e) { //捕捉例外
   e.printStackTrace();
  }finally
  {
      HibernateUtil.closeSession(session);
  }
 }
 
 
 /*------------获得学生对象-----------------*/
 public static Student getStu(int id) {
  Student stu = null;
  try {
   session = HibernateUtil.currentSession(); //开启连接 
   Transaction tx = session.beginTransaction(); //开启事务
   stu = (Student) session.get(Student.class, id);
   
   tx.commit();

  } catch (HibernateException e) { //捕捉例外
   e.printStackTrace();
  }finally
  {HibernateUtil.closeSession(session);}
  return stu;
 }
 
 
 /*------------删除学生对象-----------------*/
 public static void delStu(int id) {
  try {
   session = HibernateUtil.currentSession(); //开启连接 
   Transaction tx = session.beginTransaction(); //开启事务
   Student stu = (Student) session.get(Student.class, id);
   session.delete(stu);//删除对像
   tx.commit();

  } catch (HibernateException e) { //捕捉例外
   e.printStackTrace();
  }finally
  {HibernateUtil.closeSession(session);}
 }
 /*------------修改学生对象-----------------*/
 public static void mdfStu(Student stu) {
  try {
   session = HibernateUtil.currentSession(); //开启连接
   Transaction tx = session.beginTransaction(); //开启事务
   session.update(stu);
   tx.commit();

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

 }
 /*------------取得所有的学生列表-----------------*/
 public static List getAllStu() {
  List list=null;
  try {
   session = HibernateUtil.currentSession(); //开启连接
   Transaction tx = session.beginTransaction(); //开启事务
   Query q=session.createQuery("from Student");
   list=q.list();
   tx.commit();

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

 }

}