org.activemath.util.db
Class HibernateHelper

java.lang.Object
  org.activemath.util.db.HibernateHelper

public class HibernateHelper
extends Object

This class is a wrapper for the Hibernate SessionFactories.
It provides Sessionsto talk to hibernate, and an identifier generation method that provides unique IDs. These are generated using Hibernate's IdentifierGeneratorinterface, more specifically the TableHiLoGeneratorimplementation.

Field Summary

protected static Logger

log

Method Summary

org.hibernate.Session	getAMCoreSession()
static HibernateHelper	getInstance()
org.hibernate.Session	getLearnerHistorySession() Opens a new hibernate Session connected to the Database backend for the learner history and returns it.
long	getNextEventId() Returns a unique ID that can be assigned to an event.
org.hibernate.Session	getUlogSession() Opens a new hibernate Session connected to the Database backend for the Log DB and returns it.

Methods inherited from class java.lang.Object

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

Field Detail

log

protected static Logger log

Method Detail

getInstance

public static HibernateHelper getInstance()

getLearnerHistorySession

public org.hibernate.Session getLearnerHistorySession()

Opens a new hibernate Session connected to the Database backend for the learner history and returns it.

Don't forget to call Session.close()when you're done.

Returns:

A freshly opened Hibernate Session.

getUlogSession

public org.hibernate.Session getUlogSession()

Opens a new hibernate Session connected to the Database backend for the Log DB and returns it.

Don't forget to call Session.close()when you're done.

Returns:

A freshly opened Hibernate Session.

getAMCoreSession

public org.hibernate.Session getAMCoreSession()

getNextEventId

public long getNextEventId()

Returns a unique ID that can be assigned to an event.

Returns:

a unique id.