namespace DAL
{
    public class DBConnection
    {
        SqlConnection conn = new SqlConnection("连接");

         /// <summary>
        /// 执行一条查SQL语句,并返回ds
        /// </summary>
        /// <param name="strSql"></param>
        /// <returns></returns>
        public string strss(string strSql)
        {
            try
            {
                conn.Open();
                SqlCommand cmd = new SqlCommand(strSql, conn);
                string strsl = cmd.ExecuteScalar().ToString();
                return strsl;
            }
            catch (Exception e)
            {

                throw e;
            }
            finally
            {
                conn.Close();
            }
        }