SystemDAL/DAL.cs

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


namespace DAL
{
   public  class DALOperation
    {
        public DALOperation() { }
        //连接字符串
        public string strconn = System.Configuration.ConfigurationManager.ConnectionStrings["conn"].ToString();
        /// <summary>
        /// 执行查询
        /// </summary>
        /// <param name="strcmd">查询语句</param>
        /// <returns></returns>
        public DataSet ExecuteDataSet(string strcmd)
        {
            using (SqlConnection sqlconn = new SqlConnection(strconn))
            {
                sqlconn.Open();
                SqlCommand sqlcmd = new SqlCommand(strcmd, sqlconn);
                SqlDataAdapter sda = new SqlDataAdapter();
                sda.SelectCommand = sqlcmd;
                DataSet ds = new DataSet();
                sda.Fill(ds);
                sqlconn.Close();   
                return ds;
            }
        }
        
    }  
}