I use InterBase as database engine.I defined a exception in beforeinsert trigger when inserted fieldvalue less than a specified value.I use MIDAS as middle server.I found that in client,when inserted fieldvalue is less than the given value,the Clientdataset can not applyupdates,and middle server does not show me the defined exception.WHY?how to show exception in MIDAS? thanks.

You must write code in OnReconcileError Event of ClientDataSet, like this  

 
procedure TForm1.ClientDataSet1ReconcileError(
  DataSet: TCustomClientDataSet; E: EReconcileError;
  UpdateKind: TUpdateKind; var Action: TReconcileAction);
begin
 Showmessage(e.Message);    end;

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參考看看 可以在資料庫內處理 http://delphi.ktop.com.tw/topic.php?TOPIC_ID=34607