bookcount.java

网上购物源代码

/**
 * 
 */
package com.chinaaccpDao;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement;

/**
 * @author liu
 *
 */
public class BookCount {

	public int GetBookCount(String id)
	{
		int num = 0;
		Connection con = null;
		try {
			con = ConnectionLee.GetCon();
			Statement st = con.createStatement();
			String sql = "select quantity from product where id='"+id+"'";
			ResultSet rs = st.executeQuery(sql);
			if(rs.next())
			{
				num = rs.getInt(1);
				return num;
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
		return num;
	}
}