Common/DBHelper.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;

namespace Common
{
    public class DBHelper
    {
        private SqlConnection con = null;
        private SqlCommand cmd = null;
        private SqlDataAdapter adp = null;
        private DataSet ds = null;

        private static DBHelper DBH = null;


        public DBHelper(string str) 
        {
            con = new SqlConnection(ConfigurationManager.ConnectionStrings[str].ToString());
        }
        public DBHelper()
        {
            con = new SqlConnection(ConfigurationManager.ConnectionStrings["conn"].ToString());
        }

        public static DBHelper CreateInsert(string s) 
        {
         if(DBH==null)
         {
             DBH = new DBHelper(s);
         }
         return DBH;
        }

        //添加   修改   删除
         public int ExecuteSQL(string sql) 
        {
            cmd = new SqlCommand(sql,con);
            try
            {
                con.Open();
                return cmd.ExecuteNonQuery();

            }
            catch
            {

                return 0;
            }
            finally {
                con.Close();
            }

        }

         //添加   修改   删除