private Command BuildInsertCommand(string userName, MetaData md, FieldValueCollection fields)

        {

            StringBuilder sql = new StringBuilder();

            sql.AppendFormat("INSERT INTO [{0}]", md.TableName);

            List<string> columns = new List<string>();

            List<string> param = new List<string>();

            foreach (string key in fields.Keys)

            {

                if (!md.FieldMeteDatas[key].IsAutoIncrement)

                {

                    if (md.FieldMeteDatas[key].ColumnName == "Version")

                    {

                        columns.Add("Version");

                        param.Add("1");

                    }

                    else if (md.FieldMeteDatas[key].ColumnName == "AddBy")

                    {

                        columns.Add("AddBy");

                        param.Add(string.Format("'{0}'", userName));

                    }

                    else if

                 。。。。。。。。。。。。。//等等