teacherdaoimp.java

学校的课程管理及选课系统

package org.wangsong.dao.imp;

import java.util.List;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.Transaction;
import org.wangsong.dao.TeacherDAO;
import org.wangsong.dao.hibernate.HibernateUtil;
import org.wangsong.domain.Teacher;

public class TeacherDAOImp implements TeacherDAO
{

	private static Log log = LogFactory.getLog(TeacherDAOImp.class);

	public List getTeacher()
	{
		// TODO Auto-generated method stub
		try
		{
			Session s = HibernateUtil.currentSession();
			HibernateUtil.beginTransaction();
			List results = s.createQuery("from Teacher tea").list();
			HibernateUtil.commitTransaction();
			HibernateUtil.closeSession();
			if (results != null && results.size() > 0)
			{
				return results;
			}
		}
		catch (HibernateException e)
		{
			log.fatal(e);
		}
		return null;
	}

	public boolean deleteTeacherByID(String id)
	{
		// TODO Auto-generated method stub
		try
		{
			Session s = HibernateUtil.currentSession();
			HibernateUtil.beginTransaction();
			Teacher tea = (Teacher) s.load(Teacher.class, id);
			HibernateUtil.commitTransaction();
			System.out.println("delete teacheid " + tea.getId());
			HibernateUtil.beginTransaction();
			s.delete(tea);
			HibernateUtil.commitTransaction();
			HibernateUtil.closeSession();
			return true;
		}
		catch (HibernateException e)
		{
			log.fatal(e);
		}
		return false;
	}

	public Teacher getTeacherByID(String id)
	{
		// TODO Auto-generated method stub
		try
		{
			Session s = HibernateUtil.currentSession();
			HibernateUtil.beginTransaction();
			Teacher tea = (Teacher) s.load(Teacher.class, id);
			HibernateUtil.commitTransaction();
			HibernateUtil.closeSession();
			return tea;
		}
		catch (HibernateException e)
		{
			log.fatal(e);
		}
		return null;
	}

	public boolean updateTeacher(Teacher tea)
	{
		// TODO Auto-generated method stub
		try
		{
			Session s = HibernateUtil.currentSession();
			HibernateUtil.beginTransaction(); //HibernateUtil.beginTransaction(); 有问题！！！
			s.update(tea);
			System.out.println("update Teacher id =" + tea.getId());
			HibernateUtil.commitTransaction();
			HibernateUtil.closeSession();
			return true;
		}
		catch (HibernateException e)
		{
			log.fatal(e);
		}
		return false;
	}

	public boolean saveTeacher(Teacher tea)
	{

		try
		{
			Session session = HibernateUtil.currentSession();
			HibernateUtil.beginTransaction();
			System.out.println("开始保存");
			session.saveOrUpdate(tea);
			System.out.println("save Teacher id =" + tea.getId());
			HibernateUtil.commitTransaction();
			HibernateUtil.closeSession();
			return true;
		}
		catch (HibernateException e)
		{
			log.fatal(e);
		}
		return false;
	}

}