更新有问题

if(m_oDBMaster.QueryDataFromDataBase(strBufBit))
    {

     m_oDBMaster.AddRecord();
     _variant_t vtFld;

     vtFld.vt = VT_BSTR;
     vtFld.bstrVal =VarInfomation.m_VarName.AllocSysString();
     m_oDBMaster.SetField(1,vtFld);
     vtFld.bstrVal =VarInfomation.m_DeviceName.AllocSysString();
     m_oDBMaster.SetField(5,vtFld);//来自接口参数
     vtFld.bstrVal =VarInfomation.m_DeviceType.AllocSysString();
     m_oDBMaster.SetField(6,vtFld);
     vtFld.bstrVal =VarInfomation.m_RegisterName.AllocSysString();
     m_oDBMaster.SetField(7,vtFld);
     vtFld.bstrVal =VarInfomation.m_DataType.AllocSysString();
     m_oDBMaster.SetField(8,vtFld);
     //vtFld.bstrVal =szRWAttribute.AllocSysString();//deleted by lei.jin 2012/09/03
     //add by lei.jin 2012/09/03
     if ( VarInfomation.m_RWAttribute == 0 )
     {
      CString str("Write-Only");
      vtFld.bstrVal = str.AllocSysString();
     }
     else if ( VarInfomation.m_RWAttribute == 1 )
     {
      CString str("Read-Only");
      vtFld.bstrVal = str.AllocSysString();
     }
     else
     {
      CString str("Read-Write");
      vtFld.bstrVal = str.AllocSysString();
     }
     //add end by lei.jin  2012/09/03
     m_oDBMaster.SetField(9,vtFld);
     vtFld.vt=VT_I4;
     vtFld.lVal =VarInfomation.m_CollectFrequency;
     m_oDBMaster.SetField(10,vtFld);
     vtFld.vt = VT_BSTR;
     vtFld.bstrVal =AlarmGroup.AllocSysString();
     m_oDBMaster.SetField(12,vtFld);
     vtFld.bstrVal =szHistoryRecordWay.AllocSysString();
     m_oDBMaster.SetField(22,vtFld);
     vtFld.bstrVal =szSecurityArea.AllocSysString();
     m_oDBMaster.SetField(25,vtFld); 

     m_oDBMaster.Update();
     m_oDBMaster.CloseQuery();
    }

为啥移到更新的时候就出错呢？

inline HRESULT Recordset15::Update ( const _variant_t & Fields, const _variant_t & Values ) {
    HRESULT _hr = raw_Update(Fields, Values);
    if (FAILED(_hr)) _com_issue_errorex(_hr, this, __uuidof(this));
    return _hr;