src/com/jiudai/dao/EmployeeDAO.java

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package com.jiudai.dao;

import java.util.ArrayList;
import java.util.List;

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

import com.jiudai.Utils.HibernateUtil;
import com.jiudai.domain.Employee;

public class EmployeeDAO {

	public ArrayList<Employee> QueryAllEmployee() {
		Session s = null;
		try {
			s = HibernateUtil.getSession();
			String hql = "From Employee"; 
			Query q = s.createQuery(hql); 
			List employeeList = q.list();
			return (ArrayList<Employee>) employeeList;
		} finally {
			HibernateUtil.closeSession();
		}
	}

	public void AddEmployee(Employee employee) {
		Session s = null;
		Transaction tx = null;
		try {
			s = HibernateUtil.getSession();
			tx = s.beginTransaction();
			s.save(employee);
			tx.commit();
		} catch (HibernateException e) {
			if(tx != null)
				tx.rollback();
			throw e;
		} finally {
			HibernateUtil.closeSession();
		} 
		
	}

	public Employee GetEmployee(int id) { 
		Session s = null;
		try {
			s = HibernateUtil.getSession();
			Employee employee = (Employee)s.get(Employee.class, id);
			return employee;
		} finally {
			HibernateUtil.closeSession();
		}
	}

	public void ModifyEmployee(Employee employee) {
		Session s = null;
		Transaction tx = null;