Delphi Event Listener仅在第一次执行时

Question

概述：    我有一个应用程序，我们想听/测试事件，理想的是    将事件名称传递给存储过程并能够报告    回来它事件成功和/或不成功。

问题：    事件仅在第一次执行，后续事件不执行    得到执行。 （参见NotifyEventAlert）

存储过程：

   CREATE PROCEDURE TESTEVENT(EVENTNAME VARCHAR(65))
   AS
   BEGIN
     POST_EVENT(:EVENTNAME);
   END;

NotifyEventAlert：

   //Note event is only getting excuted the first time
   procedure TObjApplicationEvents.NotifyEventAlert(Sender: TObject;
   EventName: string; EventCount: Integer; var CancelAlerts: Boolean);
   begin
       if Assigned(Self.OnPostedEvent) then
          Self.OnPostedEvent(Self, Eventname);
   end; 

EventPosting：

    procedure TFrmEventProcessingTestLkp.btnTestEventClick(Sender: TObject);
    var
      c : TCursor;
     ae : TObjApplicationEvents;
     cq : TCustomQuery;
    begin 
        inherited;
        c := Screen.Cursor;
        Screen.Cursor := crHourglass;
        ae := nil;
        cq := nil;
       try
         try
           ae := TObjApplicationEvents.Create;
           ae.OnPostedEvent := Self.OnPostedEvent;

           cq := TCustomQuery.Create(nil);
           cq.StartTransaction;
           cq.SetOperationType(cqotStoredProcedure);
           cq.SetStoredProcName('TESTEVENT');
           cq.Params.CreateParam(ftString, 'EVENTNAME', ptInput);
           cq.ParamByName('EVENTNAME').Value := GetRecordColumnValue(cxColEvent.Index);
           cq.ExecSQL;
           cq.CommitTransaction;
           Sleep(1000);
         except on e: Exception do
         begin
           cq.RollBackTransaction;
           raise Exception.Create(e.message);
         end;
      end;
   finally
      FreeAndNil(ae);
      FreeAndNil(cq);
      Screen.Cursor:= c;
   end;
end;