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Berkeley DB .NET API Documentation
BTreeDatabase..::.Open Method (String, BTreeDatabaseConfig, Transaction)
BTreeDatabase Class See Also

Instantiate a new BTreeDatabase object and open the database represented by Filename.

Namespace: BerkeleyDB
Assembly: libdb_dotnet48 (in libdb_dotnet48.dll) Version: 4.8.24.0

# Syntax

C#

    public static BTreeDatabase Open(
    	string Filename,
    	BTreeDatabaseConfig cfg,
    	Transaction txn
    )

Visual Basic (Declaration)

    Public Shared Function Open ( _
    	Filename As String, _
    	cfg As BTreeDatabaseConfig, _
    	txn As Transaction _
    ) As BTreeDatabase

Visual C++

    public:
    static BTreeDatabase^ Open(
    	String^ Filename,
    	BTreeDatabaseConfig^ cfg,
    	Transaction^ txn
    )

#### Parameters

Filename
  Type: System..::.String
  The name of an underlying file that will be used to back the database. In-memory databases never intended to be preserved on disk may be created by setting this parameter to null.

cfg
  Type: BerkeleyDB..::.BTreeDatabaseConfig
  The database's configuration

txn
  Type: BerkeleyDB..::.Transaction
  If the operation is part of an application-specified 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.

#### Return Value

A new, open database object

# Remarks

If Filename is null, the database is strictly temporary and cannot be opened by any other thread of control, thus the database can only be accessed by sharing the single database object that created it, in circumstances where doing so is safe.

If txn is null, but AutoCommit is set, the operation will be implicitly transaction protected. Note that transactionally protected operations on a datbase object requires the object itself be transactionally protected during its open. Also note that the transaction must be committed before the object is closed.

# See Also

BTreeDatabase Class
Open Overload
BerkeleyDB Namespace