If the cursor is not yet initialized, MovePrevUnique is identical to
MoveLast(LockingInfo). Otherwise, move the cursor to
the previous non-duplicate key in the database, and store that key
and associated datum in Current. MovePrevUnique will
return false if no non-duplicate key/data pairs exist after the
cursor position in the database. If either the key or the data
is partial DatabaseEntry, its
PartialLen bytes starting
PartialOffset bytes from the beginning
of the retrieved data record are returned as if they comprised the
entire record. If any or all of the specified bytes do not exist
in the record, MovePrevUnique is successful, and any existing
bytes are returned.
Namespace:
BerkeleyDBAssembly: libdb_dotnet53 (in libdb_dotnet53.dll) Version: 5.3.28.0
Syntax
C# |
---|
public bool MovePrevUnique( DatabaseEntry key, DatabaseEntry data, LockingInfo info ) |
Visual Basic (Declaration) |
---|
Public Function MovePrevUnique ( _ key As DatabaseEntry, _ data As DatabaseEntry, _ info As LockingInfo _ ) As Boolean |
Visual C++ |
---|
public: bool MovePrevUnique( DatabaseEntry^ key, DatabaseEntry^ data, LockingInfo^ info ) |
Parameters
- key
- Type: BerkeleyDB..::.DatabaseEntry
The retrieved key
- data
- Type: BerkeleyDB..::.DatabaseEntry
The retrieved data
- info
- Type: BerkeleyDB..::.LockingInfo
The locking behavior to use.
Return Value
True if the cursor was positioned successfully, false otherwise.Remarks
If positioning the cursor fails, Current will contain
an empty KeyValuePair<(Of <(TKey, TValue>)>).