ASP.NET oracle 语句在执行更新的时候没有任何反映不知道咱回事？

string logip = Request.UserHostAddress;
  DateTime now = DateTime.Now; //注册时间
  string time = now.Year.ToString().Trim() + "-" + now.Month.ToString().Trim() + "-" + now.Day.ToString().Trim() + " " + now.Hour.ToString().Trim() + ":" + now.Minute.ToString() + ":" + now.Second.ToString();

  OracleConnection con = OraDBHelper.init();
  try
  {
  string sql2 = "update userinfo set endlogintime=to_date('" + time + "','yyyy-mm-dd hh24-mi:ss'),endloginIP='" + logip + "',lgoinnum=lgoinnum+1 where username='godlove'";
  OracleCommand daset = new OracleCommand(sql2,con);
  int i = Convert.ToInt32(daset.ExecuteNonQuery());
  if (i != 0)
  {
  Response.Write("ok");
  }
  else
  {
  Response.Write("error");
  }
  }
  catch (Exception e)
  {
  throw new Exception(e.Message.ToString());
  }
  finally
  {
  con.Close();
  }

加断点，分步调试一下，看看具体的执行情况。