sql server中用image，可以保存任何文件类型，读出时还可以改名

procedure TForm1.Button1Click(Sender: TObject);//保存文件
var str:Tmemorystream;
begin
str:=Tmemorystream.Create;
str.LoadFromFile('f:\page.doc');
str.Position:=0;
adoquery1.Append;
Tblobfield(adoquery1.FieldByName('tt')).loadfromstream(str);
try
adoquery1.Post;
finally
str.Free;
end;
end;

procedure TForm1.Button2Click(Sender: TObject);//读取文件
var str:Tmemorystream;
begin
str:=Tmemorystream.Create;
str.Position:=0;
Tblobfield(adoquery1.FieldByName('tt')).savetostream(str);
str.SaveToFile('F:\page.doc');
str.Free;
end;