it.unibz.inf.ontop.answering.connection.impl

Class JDBCConnector

java.lang.Object

it.unibz.inf.ontop.answering.connection.impl.JDBCConnector

All Implemented Interfaces:

DBConnector, AutoCloseable

public class JDBCConnector
extends Object
implements DBConnector

For RDBMS having a JDBC driver.

Method Summary

Modifier and Type	Method and Description
void	close()
boolean	connect() Keeps a permanent connection to the DB (if enabled in the settings).
OntopConnection	getConnection() Returns an OntopConnection, the main object that a client should use to access the query answering services of Quest.
Connection	getSQLPoolConnection()

Methods inherited from class java.lang.Object

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

Method Detail

connect

public boolean connect()
                throws OntopConnectionException

Keeps a permanent connection to the DB (if enabled in the settings). Needed by some in-memory DBs (such as H2).

Specified by:

connect in interface DBConnector

Throws:

OntopConnectionException

close

public void close()

Specified by:

close in interface DBConnector

Specified by:

close in interface AutoCloseable

getSQLPoolConnection

public Connection getSQLPoolConnection()
                                throws OntopConnectionException

Throws:

OntopConnectionException

getConnection

public OntopConnection getConnection()
                              throws OntopConnectionException

Returns an OntopConnection, the main object that a client should use to access the query answering services of Quest. With the QuestConnection you can get a QuestStatement to execute queries.

Note, the OntopConnection is not a normal JDBC connection. It is a wrapper of one of the N JDBC connections that quest's connection pool starts on initialization. Calling .close() will not actually close the connection, with will just release it back to the pool.

to close all connections you must call DBConnector.close().

Specified by:

getConnection in interface DBConnector

Throws:

OntopConnectionException