src/dao/CommDAO.java

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package dao;

import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Date;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Properties;

import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import util.Info;


public class CommDAO
{
	public static String dbname = "";
	public static String dbtype = "";
	
	public static Connection conn = null;
	
	public CommDAO()
	{
		conn = this.getConn();
	}



         //给字段做加减法
	 public void jiajian(String tablename,String colname,String id,String num)
	 {
		 HashMap map = this.getmap(id, tablename);
		 String value = map.get(colname).toString();
		 if(value.equals(""))value="0";
		 int i = Integer.parseInt(value);
		 int j = Integer.parseInt(num);
		 commOper("update "+tablename+" set "+colname+" = "+(i+j)+" where id="+id);
	 }
	
	 //	该方法返回一个table 用于流动图片
	public String DynamicImage(String categoryid,int cut,int width,int height){

		StringBuffer imgStr = new StringBuffer();
		StringBuffer thePics1 = new StringBuffer();
		StringBuffer theLinks1 = new StringBuffer();