Delphi ClientDataset GetGroupState

GetGroupState

ClientDataset 需先建立IndexDef，GetGroupState代入GroupingLevel，可以取得資料列在Group中所屬的狀態gbFirst、gbMiddle、gbLast

procedure TForm1.FormCreate(Sender: TObject);
var inxIndex:TIndexDef;
  aggAggregate:TAggregate;
begin
  //Create Index
  inxIndex := ClientDataSet1.IndexDefs.AddIndexDef;
  inxIndex.Name := 'Index1';
  inxIndex.Fields := 'Field1;Field2';
  inxIndex.GroupingLevel := 2; //群組的層級，取決於Fields的數量
  ClientDataset1.IndexName := inxIndex.Name;
end;

procedure TForm1.ClientDataSet1Field1GetText(Sender: TField; var Text: string;
  DisplayText: Boolean);
begin
  //TGroupPosInd = (gbFirst, gbMiddle, gbLast);
  if gbFirst in ClientDataset1.GetGroupState(1) then
    Text := Sender.AsString
  else
    Text := '';
end;

原資料

gbFirst in ClientDataset1.GetGroupState(1)

gbMiddle in ClientDataset1.GetGroupState(1)

gbLast in ClientDataset1.GetGroupState(1)

ClientDataset Methods 說明

Datasnap.DBClient.TClientDataSet Methods