问如何使用Delphi (任何版本)将部分列从该ADOQuery导出到Excel？

EN

procedure ExportRecordsetToMSExcel(const DestName: string; Data: _Recordset);
var
  ovExcelApp: OleVariant;
  ovExcelWorkbook: OleVariant;
  ovWS: OleVariant;
  ovRange: OleVariant;
  FileFormat: Integer;
  Cols, Rows: Cardinal;
begin
  FileFormat := ExcelFileTypeToInt(xlWorkbookDefault);
  ovExcelApp := CreateOleObject('Excel.Application'); // If Excel isnt installed will raise an exception

  try
    ovExcelWorkbook := ovExcelApp.WorkBooks.Add;
    ovWS := ovExcelWorkbook.Worksheets.Item[1]; // go to first worksheet
    ovWS.Activate;
    ovWS.Select;

    Rows := Data.RecordCount;
    Cols := Data.Fields.Count; // I don't want all of them, just some, maybe the ones that are visible

    ovRange := ovWS.Range['A1', 'A1']; // go to first cell
    ovRange.Resize[Rows, Cols]; //ovRange.Resize[Data.RecordCount, Data.Fields.Count];

    ovRange.CopyFromRecordset(Data, Rows, Cols); // this copy the entire recordset to the selected range in excel

    ovWS.SaveAs(DestName, FileFormat, '', '', False, False);
  finally
    ovExcelWorkbook.Close(SaveChanges := False);
    ovWS := Unassigned;
    ovExcelWorkbook := Unassigned;

    ovExcelApp.Quit;
    ovExcelApp := Unassigned;
  end;
end;
...
  ExportRecordsetToMSExcel('c:\temp\test.xlsx', ADOQuery.Recordset);

procedure ExportRecordsetToMSExcel(const DestName: string; ADOQuery: TADOQuery; const Fields: array of string); overload;

  procedure CopyData( { out } var Values: OleVariant);
  var
    R, C: Integer;
    FieldsNo: array of Integer;
    L1, H1, L2, H2: Integer;
    V: Variant;
    F: TField;
  begin
    L1 := 0;
    H1 := ADOQuery.RecordSet.RecordCount + L1 - 1;
    L2 := Low(Fields); // 0
    H2 := High(Fields);

    SetLength(FieldsNo, Length(Fields));
    for C := L2 to H2 do
      FieldsNo[C] := ADOQuery.FieldByName(Fields[C]).Index;

    Values := VarArrayCreate([L1, H1, L2, H2], varVariant);

    for R := L1 to H1 do begin
      for C := L2 to H2 do
        Values[R, C] := ADOQuery.RecordSet.Fields[FieldsNo[C]].Value;

      ADOQuery.RecordSet.MoveNext();
    end;
  end;

var
  ovExcelApp: OleVariant;
  ovExcelWorkbook: OleVariant;
  ovWS: OleVariant;
  ovRange: OleVariant;
  Values: OleVariant;
  RangeStr: string;
  Rows, Cols: Integer;
begin
  CopyData(Values);
  try
    ovExcelApp := CreateOleObject('Excel.Application');
    try
      ovExcelWorkbook := ovExcelApp.WorkBooks.Add;
      ovWS := ovExcelWorkbook.ActiveSheet;

      Rows := ADOQuery.RecordSet.RecordCount;
      Cols := Length(Fields);
      RangeStr := ToRange(1, 1, Rows, Cols); // Ex: 'A1:BE100'

      ovRange := ovWS.Range[RangeStr];
      ovRange.Value := Values;

      ovWS.SaveAs(FileName := DestName);
    finally
      ovExcelWorkbook.Close(SaveChanges := False);
      ovWS := Unassigned;
      ovExcelWorkbook := Unassigned;

      ovExcelApp.Quit;
      ovExcelApp := Unassigned;
    end;
  finally
    VarClear(Values);
  end;
end;