DAL/DBHelper.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Configuration;
using System.Data.SqlClient;
using System.Data;
namespace DAL
{
    public class DBHelper
    {
        static string connstr = ConfigurationManager.AppSettings["bank"];
        static SqlConnection conn = null;
        public static void Conn()
        {
            conn = new SqlConnection(connstr);
        }
        /// <summary>
        /// 返回结果集 
        /// </summary>
        /// <param name="sql">登陆语句</param>
        /// <returns></returns>
        public static DataSet GetSet(string sql)
        {
            DataSet ds;
            try
            {
                Conn();
                using (conn)
                {
                    if (conn.State == ConnectionState.Closed)
                        conn.Open();
                    ds = new DataSet();
                    SqlDataAdapter da = new SqlDataAdapter(sql, conn);
                    da.Fill(ds);
                }
            }
            catch (Exception)
            {
                ds = null;
            }
            finally
            {
                conn.Close();
            }
            return ds;
        }
        /// <summary>
        /// sql语句执行存储过程
        /// </summary>
        /// <param name="sql">exec proc_GetMoney</param>
        /// <param name="obj">name money</param>
        /// <returns>true/false</returns>
        public static bool UpdateData(string sql, object[] obj)
        {
            Conn();
            try
            {
                using (conn)
                {