Retrieve a key/data pair from the database. In the presence of duplicate key values, Get returns the first data item for key. If the data is a partial DatabaseEntry, PartialLen bytes starting PartialOffset bytes from the beginning of the retrieved data record are returned as if they comprise the entire record. If any or all of the specified bytes do not exist in the record, Get is successful, and any existing bytes are returned.

Namespace:  BerkeleyDB
Assembly:  libdb_dotnet181 (in libdb_dotnet181.dll) Version: 18.1.32.0

Syntax

C#
public KeyValuePair<DatabaseEntry, DatabaseEntry> Get(
	DatabaseEntry key,
	DatabaseEntry data,
	Transaction txn,
	LockingInfo info
)
Visual Basic (Declaration)
Public Function Get ( _
	key As DatabaseEntry, _
	data As DatabaseEntry, _
	txn As Transaction, _
	info As LockingInfo _
) As KeyValuePair(Of DatabaseEntry, DatabaseEntry)
Visual C++
public:
KeyValuePair<DatabaseEntry^, DatabaseEntry^> Get(
	DatabaseEntry^ key, 
	DatabaseEntry^ data, 
	Transaction^ txn, 
	LockingInfo^ info
)

Parameters

key
Type: BerkeleyDB..::.DatabaseEntry
The key to search for
data
Type: BerkeleyDB..::.DatabaseEntry
The retrieved data
txn
Type: BerkeleyDB..::.Transaction
txn is a Transaction object returned from BeginTransaction()()(); if the operation is part of a Berkeley DB Concurrent Data Store group, txn is a handle returned from BeginCDSGroup()()(); otherwise null.
info
Type: BerkeleyDB..::.LockingInfo
The locking behavior to use.

Return Value

A KeyValuePair<(Of <(TKey, TValue>)>) whose Key parameter is key and whose Value parameter is the partially retrieved bytes in the data.

Remarks

If txn is null and the operation occurs in a transactional database, the operation is implicitly transaction protected.

Exceptions

ExceptionCondition
BerkeleyDB..::.NotFoundException A NotFoundException is thrown if key is not in the database.
BerkeleyDB..::.KeyEmptyException A KeyEmptyException is thrown if the database is a QueueDatabase or RecnoDatabase database and key exists, but was never explicitly created by the application or was later deleted.

See Also