If the previous key/data pair of the database is a duplicate data
record for the current key/data pair, the cursor is moved to the
previous key/data pair of the database, and the secondary key and
primary key/data pair in Current. MovePrevDuplicate
returns false if the previous key/data pair of the database is
not a duplicate data record for the current key/data pair. 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, MovePrevDuplicate is successful, and any existing
bytes are returned.
Namespace:
BerkeleyDBAssembly: libdb_dotnet181 (in libdb_dotnet181.dll) Version: 18.1.32.0
Syntax
C# |
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public bool MovePrevDuplicate( DatabaseEntry key, DatabaseEntry pkey, DatabaseEntry data, LockingInfo info ) |
Visual Basic (Declaration) |
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Public Function MovePrevDuplicate ( _ key As DatabaseEntry, _ pkey As DatabaseEntry, _ data As DatabaseEntry, _ info As LockingInfo _ ) As Boolean |
Visual C++ |
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public: bool MovePrevDuplicate( 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>)>).