void SetParamValueNull( short nIndex );
throw( CDaoException, CMemoryException );
void SetParamValueNull( LPCTSTR lpszName );
throw( CDaoException, CMemoryException );
Parameters
nIndex
The index of the field in the recordset, for lookup by zero-based index.
lpszName
The name of the field in the recordset, for lookup by name.
Remarks
Call this member function to set the parameter to a Null value. C++ NULL is not the same as Null, which, in database terminology, means “having no value.”
For more information about updating data, see the article DAO Recordset: Recordset Operations in Visual C++ Programmer's Guide. For related information, see the topic "Parameter Object" in DAO Help.