excel report genarting (the function inside of excel)

　　将数据导出到Excel的方法有多种，速度有快慢之分，我用过三种方法，速度都比较快，下面的一种利用Excel内置的功能，是三种之中最快的。其中最主要的是下面两句：
xlQuery := xlSheet.QueryTables.Add(ADOQExport.Recordset ,xlSheet.Range['A3']);
xlQuery.Refresh;
　　不过我这里稍为复杂一点，要通过某种条件完成分类汇总。

function ExportToExcel: Boolean;
var
xlApp, xlBook, xlSheet, xlQuery: Variant;
SQLCmd: String;
i, iNextRow: Integer;

//设定单元格默认格式
procedure ExcelSetDefaultFormat;
begin
xlSheet.Cells.Font.Name := '宋体';
xlSheet.Cells.Font.Size := 12;
xlSheet.Cells.VerticalAlignment := 2;
//xlSheet.Cells.RowHeight := 17.25;
xlSheet.Range['C:D'].HorizontalAlignment := xlCenter;
end;

//输出标题
procedure ExcelSetHeader;
begin
xlSheet.Range['A1'].Value := '显示在报表第一行的标题';
xlSheet.Range['A1:F1'].HorizontalAlignment := 7;
xlSheet.Range['1:1'].Font.Size := 18;
xlSheet.Range['1:1'].Font.Bold := true;
xlSheet.Range['A2'].Value := '文件编号：WL/B 19';
xlSheet.Range['A2'].Font.Size := 11;
xlSheet.Range['F2'].Value := '记录编号：GZ-023';
xlSheet.Range['F2'].HorizontalAlignment := xlRight;
xlSheet.Range['F2'].Font.Size := 11;
xlSheet.Range['A3'].Value := 'XXXXX有限公司';
xlSheet.Range['F3'].Value := '日期：2005-X-X' ;
xlSheet.Range['F3'].HorizontalAlignment := xlRight;
//输出字段名
ADOQExport.SQL.Strings[4] := 'where 1=0';
if ADOQExport.Active then ADOQExport.Requery else ADOQExport.Open;
xlQuery := xlSheet.QueryTables.Add(ADOQExport.Recordset ,xlSheet.Range['A4']);
xlQuery.FieldNames := true;
xlQuery.RowNumbers := False;
xlQuery.FillAdjacentFormulas := False;
xlQuery.PreserveFormatting := True;
xlQuery.RefreshOnFileOpen := False;
xlQuery.BackgroundQuery := True;
xlQuery.RefreshStyle := xlOverwriteCells; //xlInsertDeleteCells;
xlQuery.SavePassword := True;
xlQuery.SaveData := True;
xlQuery.AdjustColumnWidth := True;
xlQuery.RefreshPeriod := 0;
xlQuery.PreserveColumnInfo := True;
xlQuery.Refresh;
iNextRow := 5;
end;

//设置页脚
procedure ExcelSetFooter;
begin
xlSheet.PageSetup.LeftFooter := '制表：' + DM.UserInfo.UserName;
xlSheet.PageSetup.CenterFooter := '审核：';
xlSheet.PageSetup.RightFooter := '第 &P 页，共 &N 页';
end;

//输出汇总数据
procedure ExcelSetSum;
begin
xlSheet.Range[Format('A%d', [iNextRow])].Value := '条数合计(条)';
xlSheet.Range[Format('A%d:B%0:d', [iNextRow])].HorizontalAlignment := 7;
xlSheet.Range[Format('C%d', [iNextRow])].Value := FloatToStr(DBGridEh1.Columns[6].Footer.SumValue);
xlSheet.Range[Format('C%d:F%0:d', [iNextRow])].HorizontalAlignment := 7;
xlSheet.Range[Format('A%d:F%0:d', [iNextRow])].Font.Bold := true;
Inc(iNextRow);
xlSheet.Range[Format('A%d', [iNextRow])].Value := '重量合计(kg)';
xlSheet.Range[Format('A%d:B%0:d', [iNextRow])].HorizontalAlignment := 7;
xlSheet.Range[Format('C%d', [iNextRow])].Value := FloatToStr(DBGridEh1.Columns[7].Footer.SumValue);
xlSheet.Range[Format('C%d:F%0:d', [iNextRow])].HorizontalAlignment := 7;
xlSheet.Range[Format('A%d:F%0:d', [iNextRow])].Font.Bold := true;
end;

//根据类别输出数据到Excel
procedure ExportData(DataType: Byte);
begin
SQLCmd := Format('where DataType=%d ', [DataType]);
ADOQExport.SQL.Strings[4] := SQLCmd;
if ADOQExport.Active then ADOQExport.Requery else ADOQExport.Open;
ProgressBar1.StepIt;

if not ADOQExport.IsEmpty then begin
//标题
xlSheet.Range[Format('A%d', [iNextRow])].Value := DM.GetDataTypeStr(DataType);//将DataType转换为相应的文字显示
xlSheet.Range[Format('A%d:F%0:d', [iNextRow])].HorizontalAlignment := 7;
xlSheet.Range[Format('A%d:F%0:d', [iNextRow])].Font.Bold := true;
Inc(iNextRow);

xlQuery := xlSheet.QueryTables.Add(ADOQExport.Recordset ,xlSheet.Range[Format('A%d', [iNextRow])]);
xlQuery.FieldNames := false;
xlQuery.Refresh;
Inc(iNextRow, ADOQExport.RecordCount);
xlSheet.Range[Format('A%d', [iNextRow])].Value := DM.GetDataTypeStr(DataType) + '合计(条)';
xlSheet.Range[Format('A%d:B%0:d', [iNextRow])].HorizontalAlignment := 7;
xlSheet.Range[Format('C%d', [iNextRow])].Value := Format('=SUM(C%d:C%d)', [iNextRow-ADOQExport.RecordCount, iNextRow-1]);
xlSheet.Range[Format('D%d', [iNextRow])].Value := Format('=SUM(D%d:D%d)', [iNextRow-ADOQExport.RecordCount, iNextRow-1]);
xlSheet.Range[Format('A%d:F%0:d', [iNextRow])].Font.Bold := true;
Inc(iNextRow);
end;
ProgressBar1.StepIt;
end;

begin
Result := true;
ShowProgress(0, cbbDataType.KeyItems.Count*2+2, 0); //调用前面例子中的函数显示进度面板
Screen.Cursor := crHourGlass;
try try
//建立OLE对象
xlApp := CreateOleObject('Excel.Application');
xlBook := xlApp.Workbooks.Add;
xlSheet := xlBook.Worksheets['sheet1'];
xlApp.Visible := false;
ProgressBar1.StepIt;
//设置格式
ExcelSetDefaultFormat;
//输出标题内容
ExcelSetHeader;
ProgressBar1.StepIt;

//查询结果，导到EXCEL
for i:=0 to cbbDataType.KeyItems.Count-1 do //cbbDataType: TDBComboBoxEh
ExportData(StrToInt(cbbDataType.KeyItems.Strings[i]));
//输出汇总内容
ExcelSetSum;
//设置边框
xlSheet.Range[Format('A4:F%d', [iNextRow])].Borders.LineStyle := xlContinuous;
xlSheet.Cells.EntireColumn.AutoFit;
//输出页脚
ExcelSetFooter;
except
if not VarIsNull(xlApp) then
begin
xlApp.Quit;
xlApp.Disconnect;
xlApp := Unassigned;
xlApp := NULL;
end;
result := false;
Exit;
end;
finally
pnlShadow.Visible := false;
pnlProgress.Visible := false;
Screen.Cursor := crDefault;
xlSheet := Unassigned;
xlBook := Unassigned;
if not VarIsNull(xlApp) then begin
xlApp.Visible := true;
xlApp := Unassigned;
end;
if ADOQExport.Active then ADOQExport.Close;
end;
end;