换成2分钟归档一次的变量也不行，程序如下。请斑竹和各位大侠帮我看看呀。

__object *cn;
__object *rs;

cn = __object_create("ADODB.Connection");
rs = __object_create("ADODB.Recordset");

cn->ConnectionString = "PROVIDER=WinCCOLEDBProvider.1; SERVER=NERC\\WINCC; DATABASE=CC_BF_04-08-25_13:47:41R; UID=sa; PWD=sa";
cn->Open;

rs = cn->Execute("TAG:R , SpeedAndTemp\\oil_temp,0000-00-00 00:10:00.000,0000-00-00 00:00:00.000");
while(!rs->eof)
{
SetTagWord("RealValue",rs->Fields(3)); //Return-Type: BOOL
rs->Movenext;
}
rs->Close;
cn->Close;
__object_delete(rs);
__object_delete(cn);