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C#
Visual Basic
Visual C++

Berkeley DB .NET API Documentation
SecondaryCursor..::.MovePrevUnique Method (DatabaseEntry, DatabaseEntry, DatabaseEntry, LockingInfo)
SecondaryCursor Class See Also Send Feedback

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 the secondary key and primary key/data pair in Current. MovePrevUnique will return false if no non-duplicate key/data pairs exist after the cursor position in the database. If key, or pkey, or 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: BerkeleyDB
Assembly: libdb_dotnet60 (in libdb_dotnet60.dll) Version: 6.0.20.0

# Syntax

C#
    public bool MovePrevUnique(
    	DatabaseEntry key,
    	DatabaseEntry pkey,
    	DatabaseEntry data,
    	LockingInfo info
    )

Visual Basic (Declaration)
    Public Function MovePrevUnique ( _
    	key As DatabaseEntry, _
    	pkey As DatabaseEntry, _
    	data As DatabaseEntry, _
    	info As LockingInfo _
    ) As Boolean

Visual C++
    public:
    bool MovePrevUnique(
    	DatabaseEntry^ key,
    	DatabaseEntry^ pkey,
    	DatabaseEntry^ data,
    	LockingInfo^ info
    )

#### Parameters

key
  Type: BerkeleyDB..::.DatabaseEntry
  The retrieved key in secondary db

pkey
  Type: BerkeleyDB..::.DatabaseEntry
  The key of the matching record in primary db

data
  Type: BerkeleyDB..::.DatabaseEntry
  The data of the matching record in primary db

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>)>).

# See Also

SecondaryCursor Class
MovePrevUnique Overload
BerkeleyDB Namespace