VC++连接Access

VC++连接Access
/*
*读取Access数据库中的数据
*/
void CMFCSQLDlg::OnButton1()
{
CoInitialize(NULL);
       _ConnectionPtr  m_pAppConn;
       HRESULT hResult;
 
     try
        {
                hResult = m_pAppConn.CreateInstance(("ADODB.Connection"));///创建Connection对象
                if(SUCCEEDED(hResult))
                {
                 m_pAppConn->Open("Provider=Microsoft.Jet.OLEDB.4.0 ;Data Source = .\\DataBase\\aa.mdb", "","",adModeUnknown);
                }
              _CommandPtr m_pCommand;
              _RecordsetPtr m_pRecordset;
              m_pCommand.CreateInstance("ADODB.Command");
 
              _variant_t vNULL;
              vNULL.vt = VT_ERROR;
              vNULL.scode = DISP_E_PARAMNOTFOUND;///定义为无参数
              m_pCommand->ActiveConnection = m_pAppConn;///非常关键的一句，将建立的连接赋值给它
              m_pCommand->CommandText = "SELECT * from myself";///命令字串
      &nb