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CRecordset::SetParamNull 

Flags a parameter as Null (specifically having no value) or as non-Null.


void SetParamNull(
   int nIndex,
   BOOL bNull = TRUE 
);

Parameters

nIndex

The zero-based index of the parameter.

bNull

If TRUE (the default value), the parameter is flagged as Null. Otherwise, the parameter is flagged as non-Null.

Unlike SetFieldNull, you can call SetParamNull before you have opened the recordset.

SetParamNull is typically used with predefined queries (stored procedures).

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