uses ComObj,clipbrd;

1 方法:

function ToExcel(sfilename:string; ADOQuery:TADOQuery):boolean;
const
xlNormal=-4143;
var
y :integer;
tsList :TStringList;
s,filename :string;
aSheet :Variant;
excel:OleVariant;
savedialog:tsavedialog;
begin
result:=true;
try
excel:=CreateOleObject('Excel.Application');
excel.workbooks.add;
except
//screen.cursor:=crDefault;
showmessage('无法调用Excel！');
exit;
end;
savedialog:=tsavedialog.Create(nil);
savedialog.FileName:=sfilename; //存入文件
savedialog.Filter:='Excel文件(*.xls)|*.xls';
if savedialog.Execute then
begin
if FileExists(savedialog.FileName) then
try
if application.messagebox('该文件已经存在，要覆盖吗？','询问',mb_yesno+mb_iconquestion)=idyes then
DeleteFile(PChar(savedialog.FileName))
else
begin
Excel.Quit;
savedialog.free;
//screen.cursor:=crDefault;
Exit;
end;
except
Excel.Quit;
savedialog.free;
screen.cursor:=crDefault;
Exit;
end;
filename:=savedialog.FileName;
end;
savedialog.free;
if filename='' then
begin
result:=true;
Excel.Quit;
//screen.cursor:=crDefault;
exit;
end;
aSheet:=excel.Worksheets.Item[1];
tsList:=TStringList.Create;
//tsList.Add('查询结果'); //加入标题

s:=''; //加入字段名
for y := 0 to adoquery.fieldCount - 1 do
begin
s:=s+adoQuery.Fields.Fields[y].FieldName+#9 ;
Application.ProcessMessages;
end;
tsList.Add(s);
try
try
ADOQuery.First;
While Not ADOQuery.Eof do
begin
s:='';
for y:=0 to ADOQuery.FieldCount-1 do
begin
s:=s+ADOQuery.Fields[y].AsString+#9;
Application.ProcessMessages;
end;
tsList.Add(s);

ADOQuery.next;
end;
Clipboard.AsText:=tsList.Text;
except
result:=false;
end;
finally
tsList.Free;
end;
aSheet.Paste;
MessageBox(Application.Handle,'数据导出完毕！','系统提示',MB_ICONINFORMATION or MB_OK);
try
if copy(FileName,length(FileName)-3,4)<>'.xls' then
FileName:=FileName+'.xls';
Excel.ActiveWorkbook.SaveAs(FileName, xlNormal, '', '', False, False);
except
Excel.Quit;
screen.cursor:=crDefault;
exit;
end;
Excel.Visible := false; //true会自动打开已经保存的excel
Excel.Quit;
Excel := UnAssigned;

end;

2.调用:

ToExcel('D:\a.xsl',QueryToExcel);//路径可以自定义