datatable批量更新数据

 /// <summary>
        /// 批量更新服务器数据库 数据
        /// </summary>
        /// <param name="dt">要更新的表的数据</param>
        /// <param name="sql">要更新的目标服务器数据</param>
        /// <param name="connectionString">服务器数据库连接字符串</param>
        /// <param name="isAccount">是否是更新发送账号或者已发送完邮件true是发送账号、false是已发送邮件</param>
        /// <returns></returns>
        public static int UpdateSoMuch(DataTable dt,string sql, string connectionString,bool isAccount)
        {
            DataTable dtt=new DataTable ();
            using (OracleConnection conn = new OracleConnection(connectionString))
            {
                OracleCommand cmd = new OracleCommand(sql,conn);
                OracleDataAdapter oda = new OracleDataAdapter(cmd);
                oda.Fill(dtt);
                OracleCommandBuilder cb = new OracleCommandBuilder(oda);
                if (isAccount)
                {
                    for (int i = 0; i < dtt.Rows.Count; i++)
                    {
                        dtt.Rows[i]["sendcount"] = dt.Rows[i]["sendcount"];
                        dtt.Rows[i]["LAST_SEND_TIME"] = dt.Rows[i]["LAST_SEND_TIME"];
                        dtt.Rows[i]["state"] = 0;
                    } 
                }
                else
                {
                    for (int i = 0; i < dtt.Rows.Count; i++)
                    {
                        dtt.Rows[i]["flag"] = dt.Rows[i]["flag"];
                        dtt.Rows[i]["endtime"] = dt.Rows[i]["endtime"];
                        dtt.Rows[i]["sendtime"] = dt.Rows[i]["sendtime"];
                        dtt.Rows[i]["sendoktime"] = dt.Rows[i]["sendoktime"];
                        dtt.Rows[i]["failedreason"] = dt.Rows[i]["failedreason"];
                        dtt.Rows[i]["send_email"] = dt.Rows[i]["send_email"];
                        //dtt.Rows[i]["send_account"] = dt.Rows[i]["send_account"];
                        dtt.Rows[i]["failcount"] = dt.Rows[i]["failcount"];
                    } 
                }
                return oda.Update(dtt);
            }
        }

//有时 更新不了数据 主要几点：查找数据的sql、

缺少OracleCommandBuilder cb = new OracleCommandBuilder(oda);
datatable的datarow的rowstate状态未变更 所以目前给dtt动态赋值 更新需要的数据