persistenceservice.java

基于jbpm开发的实例

package com.flowdemo.service;

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

import org.hibernate.Query;
import org.hibernate.Session;

import com.flowdemo.po.Expenses;
import com.flowdemo.po.Users;
import com.flowdemo.util.HibernateSessionFactory;

public class PersistenceService {

	/**
	 * 保存一个报销单对象
	 * @param expense
	 */
	public static void save(Expenses expense){
		Session hibernateSession = HibernateSessionFactory.getSession();
		try{
			//hibernateSession.getTransaction().begin();
			hibernateSession.beginTransaction();
			hibernateSession.saveOrUpdate(expense);
			hibernateSession.getTransaction().commit();
		}catch(Exception e){
			e.printStackTrace();
			hibernateSession.getTransaction().rollback();
		}finally{
			HibernateSessionFactory.closeSession();
		}
	}
	
	/**
	 * 更新一个报销单对象
	 * @param expense
	 */
	public static void update(Expenses expense){
		Session hibernateSession = HibernateSessionFactory.getSession();
		try{
			//hibernateSession.getTransaction().begin();
			hibernateSession.beginTransaction();
			//hibernateSession.saveOrUpdate(expense);
			hibernateSession.update(expense);
			hibernateSession.getTransaction().commit();
		}catch(Exception e){
			e.printStackTrace();
			hibernateSession.getTransaction().rollback();
		}finally{
			HibernateSessionFactory.closeSession();
		}
	}
	
	/**
	 * 删除一个报销单对象
	 * @param expense
	 */
	public static void delete(Expenses expense){
		Session hibernateSession = HibernateSessionFactory.getSession();
		try{
			//hibernateSession.getTransaction().begin();
			hibernateSession.beginTransaction();
			hibernateSession.delete(expense);
			hibernateSession.getTransaction().commit();
		}catch(Exception e){
			e.printStackTrace();
			hibernateSession.getTransaction().rollback();
		}finally{
			HibernateSessionFactory.closeSession();
		}
	}
	
	/**
	 * 返回一个报销单列表
	 * @return
	 */
	public static List<Expenses> getExpenses(){
		Session hibernateSession = HibernateSessionFactory.getSession();
		List<Expenses> expenses = new ArrayList<Expenses>();
		try{
			
			//hibernateSession.getTransaction().begin();
			hibernateSession.beginTransaction();
			//hibernateSession.delete(expense);
			Query query = hibernateSession.createQuery("from Expenses");
			expenses = query.list();
			hibernateSession.getTransaction().commit();
			
		}catch(Exception e){
			e.printStackTrace();
			hibernateSession.getTransaction().rollback();
		}finally{
			HibernateSessionFactory.closeSession();
		}
		return expenses;
	}
	
	/**
	 * 根据用户ID返回一个对象
	 * @param userId
	 * @return
	 */
	public static Users getUserById(String userId){
		Session hibernateSession = HibernateSessionFactory.getSession();
		Users user = new Users();
		try{
			hibernateSession.beginTransaction();
			user = (Users)hibernateSession.get(Users.class, userId);	
			hibernateSession.getTransaction().commit();
			
		}catch(Exception e){
			e.printStackTrace();
			hibernateSession.getTransaction().rollback();
		}finally{
			HibernateSessionFactory.closeSession();
		}
		return user;
	}
	
	/**
	 * 检查用户是否存在
	 * @param user
	 * @return
	 */
	public static boolean checkUser(Users user){
		Users user2 = null;
		try{
			user2 = getUserById(user.getUserId());
			
			System.out.println("用户的值==="+user2.getUserName());
		}catch(Exception e){
			e.printStackTrace();
		}finally{
			//HibernateSessionFactory.closeSession();
		}
		if(user2.getUserPass() == user.getUserPass() || user2.getUserPass().equals(user.getUserPass())){
			return true;
		}else{
			return false;
		}
	}
	
	/**
	 * 测试主方法
	 * @param args
	 */
	public static void main(String[]args){
		Session hibernateSession = HibernateSessionFactory.getSession();
		System.out.println("测试Session是否启动1"+hibernateSession.toString());
		hibernateSession.close();
		System.out.println("测试Session是否启动2"+hibernateSession.toString());
		
		hibernateSession = HibernateSessionFactory.getSession();
		System.out.println("测试Session是否启动1"+hibernateSession.toString());
		HibernateSessionFactory.closeSession();
		System.out.println("测试Session是否启动2"+hibernateSession.toString());
		
		Users user = new Users();
		user.setUserId("001");
		user.setUserPass("employee");
		
		boolean flag = checkUser(user);
		System.out.println("是否是正确的？"+flag);
	}
	
}