field f2 为 LONG RAW 类型：
var
s:TMemoryStream;
begin
s:=TMemoryStream.Create();
Image1.Picture.Bitmap.SaveToStream(s);
Table1.Append();
Table1.FieldByName('f1').asInteger:=GetTickCount();
TBlobField(Table1.FieldByName('f2')).LoadFromStream(s);
Table1.Post();
s.free;
end;
