Module org.apache.jena.tdb2

Package org.apache.jena.tdb2

Class DatabaseMgr

java.lang.Object

org.apache.jena.tdb2.DatabaseMgr

public class DatabaseMgr
extends Object

Operations for TDBS DatasetGraph, including admin operations See TDB2Factory for creating API-level Datasets.

See Also:

• TDB2Factory

Method Summary

Modifier and Type	Method	Description
static String	backup(DatasetGraph container)	Create a backup for a switchable TDB database.
static void	compact(DatasetGraph container)	Compact a dataset which must be a switchable TDB database.
static void	compact(DatasetGraph container, boolean shouldDeleteOld)	Compact a dataset which must be a switchable TDB database.
static DatasetGraph	connectDatasetGraph(String location)	Create or connect to a TDB2-backed dataset
static DatasetGraph	connectDatasetGraph(org.apache.jena.dboe.base.file.Location location)	Create or connect to a TDB2-backed dataset
static DatasetGraph	createDatasetGraph()	Create an in-memory TDB2-backed dataset (for testing)
static boolean	isTDB2(DatasetGraph datasetGraph)	Return whether a DatasetGraph is a TDB2 database.
static org.apache.jena.dboe.base.file.Location	location(DatasetGraph datasetGraph)	Return the location of a DatasetGraph if it is backed by TDB, else null.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Details

connectDatasetGraph

public static DatasetGraph connectDatasetGraph(org.apache.jena.dboe.base.file.Location location)

Create or connect to a TDB2-backed dataset

connectDatasetGraph

public static DatasetGraph connectDatasetGraph(String location)

Create or connect to a TDB2-backed dataset

compact

public static void compact(DatasetGraph container)

Compact a dataset which must be a switchable TDB database. This is the normal dataset type for on-disk TDB2 databases.

Deletes old database after successful compaction if shouldDeleteOld is true.

This is equivalent to a call of compact(container, false) (do not delete old database).

Parameters:

container - This compact(container, false) instead.

compact

public static void compact(DatasetGraph container,
 boolean shouldDeleteOld)

Compact a dataset which must be a switchable TDB database. This is the normal dataset type for on-disk TDB2 databases. Deletes old database after successful compaction if shouldDeleteOld is true.

Parameters:

container -

shouldDeleteOld -

backup

public static String backup(DatasetGraph container)

Create a backup for a switchable TDB database. This is the normal dataset type for on-disk TDB2 databases.

The backup is created in the databases folder, under "Backups".

Backup creates a consistent copy og the database. It is performed as a read-transaction and does not lock out other use of the dataset.

Parameters:

container -

Returns:

File name of the backup.

createDatasetGraph

public static DatasetGraph createDatasetGraph()

Create an in-memory TDB2-backed dataset (for testing)

isTDB2

public static boolean isTDB2(DatasetGraph datasetGraph)

Return whether a DatasetGraph is a TDB2 database.

location

public static org.apache.jena.dboe.base.file.Location location(DatasetGraph datasetGraph)

Return the location of a DatasetGraph if it is backed by TDB, else null.