MDAC 2.5 SDK - OLE DB Programmer's Reference
Appendix A: Data Types

Variable-Length Data Types

The following type indicators are for variable-length data types. For more information, see "Fixed-Length and Variable-Length Data Types" in Chapter 13, "Data Types in OLE DB."

DBTYPE_STR

DBTYPE_BYTES

DBTYPE_WSTR

DBTYPE_VARNUMERIC