我在 Delphi 中有一个带有多个列(字段)的 ADOQuery(TADOQuery,绑定到其他可视组件)。我可以将所有数据(行和列)导出到 Excel 文件。我正在使用 OleVariant,类似于 ovRange.CopyFromRecordset(数据、行、列)。
如何使用 Delphi(任何版本)仅将某些列从 ADOQuery 导出到 Excel?
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);
已解决(基于@MartynA和@PeterWolf的答案的工作解决方案):
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;