请问WINCC 用C语言操作SQL SERVER 2005 数据库有什么需要注意的么，有没有什么资料可以查看，另外下面是我的代码，可以连上数据库，但是无法操作，希望高手帮忙！


Conn = __object_create("ADODB.Connection");
sprintf(ConnectionString,"Provider='SQLOLEDB.1';Integrated Security='SSPI';Persist Security

Info='False';Initial Catalog='TONYSUN';Data Source='(local)\\WINCC'");
//printf("%s\r\n",ConnectionString);
Conn->Open(ConnectionString);
if (Conn->State==1)
{

rsTemp = __object_create("ADODB.RecordSet");
//sprintf(szQuery,"SELECT * FROM TRENDS_SELECTIONS WHERE PenGroup='%s' AND

COMPUTER='%//s'",Group,computer);
// rsTemp->CursorLocation = adUseClient;
// rsTemp->Open(szQuery, Conn,adOpenKeyset ,adLockOptimistic);
rsTemp->AddNew();

rsTemp->Fields("PenDes cription")->Value=Des cription;

rsTemp->Fields("PenTagName")->Value=Tag_Name;

rsTemp->Fields("PenUnits")->Value=Units;

rsTemp->Fields("PenMax")->Value=Max_Value;

rsTemp->Fields("PenMin")->Value=Min_Value;

rsTemp->Fields("PenObject")->Value=lpszObjectName;

rsTemp->Fields("PenPicture")->Value= lpszPictureName;

rsTemp->Fields("PenGroup")->Value=Group;

rsTemp->Fields("COMPUTER")->Value=computer;

rsTemp->Update;

Conn->Close;
}