MDAC 2.5 SDK - OLE DB Programmer's Reference
Appendix H: Data Type Conversion Interfaces

Conversions Supported from Data Type PROPVARIANT

To data types:

I1, I2, I4, I8, UI1, UI2, UI4, UI8, R4, R8, BOOL, ERROR, BSTR, STR, WSTR, BYTES, DATE, DBDATE, DBTIME, DBTIMESTAMP, FILETIME, GUID, CY, DECIMAL, NUMERIC, VARNUMERIC, VARIANT, PROPVARIANT, IDispatch, IUnknown

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