DBPROP_LITERALIDENTITY
Property group: Rowset
Property set: DBPROPSET_ROWSET
Column? N
Type: VT_BOOL
Typical R/W: R
Description: Literal Row Identity
Value |
Meaning |
|---|---|
VARIANT_TRUE |
The consumer can perform a binary comparison of two row handles to determine whether they point to the same row. |
VARIANT_FALSE |
The consumer must call IRowsetIdentity::IsSameRow to determine whether two row handles point to the same row. If DBPROP_LITERALIDENTITY is set to VARIANT_FALSE, multiple different concurrently held row handles can represent the same row in the underlying data store. To the rowset, these generally appear as separate rows. Therefore, a change made (either in immediate mode or via IRowsetUpdate) to a retrieved column value (for example, a nondeferred column or a deferred column with DBPROP_CACHEDEFERRED set to VARIANT_TRUE) is not reflected when retrieving the row through a second row handle. Calling IRowsetRefresh::RefreshVisibleData, IRowsetUpdate::Undo, or IRowsetUpdate::Update affects only changes made through the specified row handle. |
Whether the handle of a newly inserted row can be successfully compared to another handle is specified by the DBPROP_STRONGIDENTITY property.
For more information about row identity, see Uniqueness of Rows in the Rowset.