VC++连接SQLServer

VC++连接SQLServer
/*
*连接SQL
*/
void CMFCSQLDlg::OnButton3()
{
       // TODO: Add your control notification handler code here
       _ConnectionPtr   m_pConnection;
// 在应用程序的InitInstance函数里加入
      if(S_OK!=CoInitialize(NULL))  
      {  
         AfxMessageBox("初始化COM库错误!");
      }else
         {
            AfxMessageBox("初始化COM库成功!");
         }
//  连接数据库：  
HRESULT  hr; //返回结果变量
try  
{  
      hr=m_pConnection.CreateInstance("ADODB.Connection"); //创建Connection对象
      if(SUCCEEDED(hr))  
      {  
//hr=m_pConnection->Open("Provider=SQLOLEDB;Server=808644DA83B446C\SQLEXPRESS;Database=ChinabaseSQLServer;UserID=sa;pwd=123","","",adModeUnknown);   //;Integrated Security=SSPI
m_pConnection->Open("Provider=SQLOLEDB.1;Server=808644DA83B446C\\SQLEXPRESS;DATABASE=ChinabaseSQLServer;UID=sa;PWD=123;","","",adModeUnknown);
MessageBox("连接SQL运行成功!","成功",MB_OK);
 
              _CommandPtr m_pCommand;
              _RecordsetPtr m_pRecordset;
              m_pCommand.CreateInstance("ADODB.Command");
 
              _variant_t vNULL;
              vNULL.vt = VT_ERROR;