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        private readonly static String connectionString =
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        /// Ìî³äÊý¾Ý¼¯
        /// </summary>
        /// <param name="ds"></param>
        /// <param name="sql"></param>
        public void SetDataSet(DataSet ds,String sql)
        {
            SqlDataAdapter ada = new SqlDataAdapter(sql,connectionString);
            ada.Fill(ds);
        }
       
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        public String GetXMLData()
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