studentdaoimp.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.StudentDAO;
import org.wangsong.dao.hibernate.HibernateUtil;
import org.wangsong.domain.Student;

public class StudentDAOImp implements StudentDAO
{

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

	public List getStudent()
	{
		 
		try
		{
			Session s = HibernateUtil.currentSession();
			HibernateUtil.beginTransaction();
			List results = s.createQuery("from Student stu").list();
			HibernateUtil.commitTransaction();
			HibernateUtil.closeSession();
			if (results != null && results.size() > 0)
			{
				return results;
			}
		}
		catch (HibernateException e)
		{
			log.fatal(e);
		}
		return null;
	}

	public boolean deleteStudentByID(String id)
	{
		 
		try
		{
			Session s = HibernateUtil.currentSession();
			HibernateUtil.beginTransaction();
			
			Student stu = (Student)s.get(Student.class,id);
			HibernateUtil.commitTransaction();
		    System.out.println("删除学号为"+stu.getId()+"的学生!");
			HibernateUtil.beginTransaction();
			s.delete(stu);
			System.out.println("删除完毕！！");
			HibernateUtil.commitTransaction();
			HibernateUtil.closeSession();
			return true;
		}
		catch (HibernateException e)
		{
			log.fatal(e);
		}
		return false;
	}

	public Student getStudentByID(String id)
	{
		 
		try
		{
			Session s = HibernateUtil.currentSession();
			HibernateUtil.beginTransaction();
			Student stu = (Student)s.load(Student.class, id);
			HibernateUtil.commitTransaction();
			HibernateUtil.closeSession();
			return stu;
		}
		catch (HibernateException e)
		{
			log.fatal(e);
		}
		return null;
	}

	public boolean updateStudent(Student student)
	{
		 
		try
		{
			Session session = HibernateUtil.currentSession();
			HibernateUtil.beginTransaction();
			session.update(student);
			System.out.println("update student id =" + student.getId());
			HibernateUtil.commitTransaction();
			HibernateUtil.closeSession();
			return true;
		}
		catch (HibernateException e)
		{
			log.fatal(e);
		}
		return false;
	}

	public boolean saveStudent(Student stu)
	{
		 
		 try
		 {	 
			Session session =HibernateUtil.currentSession(); 
			HibernateUtil.beginTransaction();
			session.saveOrUpdate(stu);
			HibernateUtil.commitTransaction();
			System.out.println("save student id ="+stu.getId());
			HibernateUtil.closeSession();
			return true;
		 }
		 catch(Exception e)
		 {
			  
			 return false;
		 }
	}

}