MDAC 2.5 SDK - OLE DB Programmer's Reference
Appendix C: OLE DB Properties

DBPROP_MAYWRITECOLUMN

Property group: Rowset

Property set: DBPROPSET_ROWSET

Column? Y

Type: VT_BOOL

Typical R/W: R/W

Description: Column Writable

Indicates whether or not a particular column is writable. This property can be set implicitly through the command used to create the rowset. For example, if the rowset is created by the SQL statement SELECT A, B FROM MyTable FOR UPDATE OF A, this property is VARIANT_TRUE for column A and VARIANT_FALSE for column B.