我在delphi中想帮定ado数据库，总是出错，请指点

var
 ds:Datasets;
 db:Dataset;

ds:=Map1.Layers.item(1).Datasets;
ds.Add(miDataSetADO,ADOQuery1.Recordset,EmptyParam,EmptyParam,EmptyParam,EmptyParam,EmptyParam,EmptyParam );

为什么会出错呢？
“operation not allowed in this datasets collection”

看看这个？
http://www.gisempire.com/bbs/dispbbs.asp?boardID=42&ID=4934

http://www.gisempire.com/bbs/dispbbs.asp?boardID=42&ID=6666&replyID=44930&skin=1