productdaoimpl.java

这是一个网上购物店的源码

package org.digitstore.dao.daoimp;

import java.util.List;
import java.util.ArrayList;
import java.util.StringTokenizer;
import java.util.ListIterator;

import org.digitstore.dao.*;
import org.digitstore.domain.Item;
import org.digitstore.domain.Product;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.dao.DataAccessException;
import net.sf.hibernate.*;

import org.digitstore.dao.hibernate.*;

public class ProductDAOImpl implements ProductDao{
	
	private static Log log = LogFactory.getLog(ProductDAOImpl.class);
	/* (non-Javadoc)
	 * @see org.digitstore.dao.ProductDao#getProduct(java.lang.String)
	 */
	public Product getProduct(String productId) throws DataAccessException {
		// TODO Auto-generated method stub
		Session s = HibernateUtil.currentSession();
		try{
			HibernateUtil.beginTransaction();
			return (Product)s.load(Product.class,productId);
		}catch(HibernateException e){
			log.fatal(e);
		}
		return null;
	}
	/* (non-Javadoc)
	 * @see org.digitstore.dao.ProductDao#getProductListByCategory(java.lang.String)
	 */
	public List getProductListByCategory(String categoryId)
			throws DataAccessException {
		// TODO Auto-generated method stub
		try{
			Session s = HibernateUtil.currentSession();
			HibernateUtil.beginTransaction();
			String str = " from Product pro where pro.categoryId = '" + categoryId + "'";
			Query query = s.createQuery(str);
			return query.list() ;
		}catch(HibernateException e){
			log.fatal(e);
		}
		return null;
	}
	/* (non-Javadoc)
	 * @see org.digitstore.dao.ProductDao#searchProductList(java.lang.String)
	 */
	public List searchProductList(String keywords) throws DataAccessException {
		// TODO Auto-generated method stub
	    try{
			Session s = HibernateUtil.currentSession();
			HibernateUtil.beginTransaction();
			String str = this.getSearchSql(keywords);
			Query query = s.createQuery(str);
			return query.list() ;
		}catch(HibernateException e){
			log.fatal(e);
		}
		return new ArrayList();
	}
	
	
	    
	    public String getSearchSql(String keyword){
	        String key = "%" + keyword + "%";
	        StringBuffer buff = new StringBuffer();
	        buff.append("from Product p where ");	        
	        buff.append(" p.name like ");
	        buff.append(key);
	        buff.append(" or p.description like ");
	        buff.append(key);
	       return buff.toString();
	    }
	 
}