shoppingcartdaohbnimpl.java

购物车程序:主要用Struts+Hibernate框架实现

package com.rmeng.shoppingCart.dao.impl;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

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

import com.rmeng.shoppingCart.dao.ShoppingCartDao;
import com.rmeng.shoppingCart.javabean.entity.Cart;
import com.rmeng.shoppingCart.javabean.entity.Order;
import com.rmeng.shoppingCart.javabean.entity.Product;
import com.rmeng.shoppingCart.javabean.entity.User;
import com.rmeng.shoppingCart.util.HbnUtil;


public class ShoppingCartDaoHbnImpl implements ShoppingCartDao {
				public User login(String userName, String password) 
						{		
						Session s=HbnUtil.getSession();
						Transaction tran=s.beginTransaction();
						User user = null;
						try 
						{	
						Query query = s.createQuery(
								"select user from User user " +
								"where user.userName= :username " +
						"and user.password= :password");
						query.setString("username",userName);
						query.setString("password",password); 
						Iterator it=query.iterate();
						if(it.hasNext())
						{
							user = (User)it.next();
						}
						return user;			
					} 
					catch (RuntimeException e) 
					{	
						if(tran!=null)
							tran.rollback();
						e.printStackTrace();
						throw e;
					}finally
					{
						s.close();
					}
	            		 
				}
	
					
			public int generateOrder(User user,Cart cart ) 
				{				
				Order order = new Order();
				Session session=HbnUtil.getSession();
				Transaction tran=session.beginTransaction();
				try
				{
				User u = (User)session.get(User.class,user.getUid());
				if(session.get(User.class,user.getUid()) == null)
				{
						session.save(user);
				}
				order.getItems().addAll(cart.getItems().values());
				session.save(order);    			
				return order.getOid();  
				}catch(RuntimeException e)
				{
					if(tran!=null)
						tran.rollback();
					e.printStackTrace();
					throw e;
				}finally
				{		
	             session.close();
				}
			
			} 
					
			
				public Map showAllProducts() {
					Map<Integer,Product> prods = new HashMap<Integer,Product>();														
					Session session=HbnUtil.getSession();
					Transaction tran=session.beginTransaction();
					try {		
					Query q=session.createQuery("select product from Product product");
					ArrayList list = (ArrayList)q.list();
					Iterator it=list.iterator();
					while(it.hasNext())
					{
						Product product=(Product) it.next();
						prods.put((Integer)product.getPid(),product);
					}
					return prods;
				} catch (RuntimeException e){
					if(tran!=null)
            		tran.rollback();
					e.printStackTrace();
					throw e;
				}finally
				{
					session.close();
				}			
				}	

			}