MDAC 2.5 SDK - OLE DB Providers
OLE DB Provider for ODBC

NULL Data Type Conversions

Convert to type

VARIANT

Unsupported data type conversions

I1, I2, I4, I8, UI1, UI2, UI4, UI8, R4, R8, CY, NUMERIC, DECIMAL, DBTIME, DATE, DBDATE, DBTIMESTAMP, BOOL, BSTR, BYTES, Empty, ERROR, GUID, IDISPATCH, IUNKNOWN, STR, WSTR