orderstatusdao.java

一个简易的网上书店（jsp+sqlservler+struts）。

package com.webshop.db;
import java.sql.*;
import com.webshop.domain.OrderStatus;
import com.webshop.exception.ActionException;

/**
 * @author w
 *
 * To change this generated comment edit the template variable "typecomment":
 * Window>Preferences>Java>Templates.
 * To enable and disable the creation of type comments go to
 * Window>Preferences>Java>Code Generation.
 */
public class OrderStatusDAO {

	/**
	 * Constructor for OrderStatusDAO.
	 */
	public OrderStatusDAO() {
		super();
	}
	
		Connection con;//数据库连接
	String selectOrderStatusById="select * from orderStatus where orderid=? and linenum=?";
	
	
	/**
	 * 根据ID查找商品信息
	 */
	public OrderStatus getOrderStatusById(int orderId,int lineNumber)
	{
		OrderStatus orderStatus=null;
		try
		{
			con=DatabaseConnection.getConnection();
		}
		catch(Exception e)
		{
			throw new ActionException("不能获得连接，"+e.getMessage());
		}
		try
		{
			PreparedStatement pstmt=con.prepareStatement(selectOrderStatusById);
			pstmt.setInt(1,orderId);
			pstmt.setInt(2,lineNumber);
			ResultSet rst=pstmt.executeQuery();
          
			if(rst.next())
			{
				orderStatus=new OrderStatus();
				orderStatus.setLineNumber(lineNumber);
				orderStatus.setOrderId(orderId);
				orderStatus.setStatus(rst.getString("status"));
			    orderStatus.setTimeStamp(rst.getDate("timestamp"));
			}
				con.close();
		}
		catch(SQLException e)
		{
			 throw new ActionException("执行数据库操作发生错误，"+e.getMessage());
		}
		finally
		{
			try
			{
				if(con!=null)
				con.close();
			}
			catch(Exception e2)
			{
			}
		}
		return orderStatus;
	}	

}