取dataset转多table

 protected void ReturnDataSetTest()
    {
        string sql = @"select * from user where id=@user_id;select * from role where id=@role_id;
;select * from permission where id=123;";
        DataSet dataSet= SqlHelper.ReturnDataSet(SqlHelper.getConDB(), sql, CommandType.Text,new SqlParameter[] { new SqlParameter ("@user_id", 1) }, new SqlParameter ("@role_id", 2) });
        List logs = new List();
        foreach (DataTable table in dataSet.Tables)
        {
            logs.Add("--------------------------------");
            logs.Add("--------------------------------");
            logs.Add(table.TableName);
            string columnNames="";
            foreach (DataColumn column in table.Columns)
            {
                columnNames += column.ColumnName + "    ";
            }
            logs.Add(columnNames);
            logs.Add("--------------------------------");
            foreach (DataRow row in table.Rows)
            {
                string rowsContent = "";
                foreach (DataColumn column in table.Columns)
                {
                    Object temp_cell = row.Field