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Hibernate and Multiple Session Factories
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QAIX > Java Programming > Hibernate and Multiple Session Factories 8 May 2008 09:35:40
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Hibernate and Multiple Session Factories

Matt Johnston 8 May 2008 09:35:40
 My application is needing to connect to two seperate databases. According to Hibernate documentation, I will need to use seperate session factories.

Right now I am using the HibernateIntercepto­r written by Gavin King (http://www.hiberna­te.org/hib_docs/onli­ne/adminapp/) Unfortunately, it can only grab one session factory for Hibernate.

Has anyone found a way to easily use more than one hibernate session factory?

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Jay Bose 2 August 2005 20:12:23 [ permanent link ]
 Modify the code into your own version: make it hold an array/collection of session factories. Then the end user would have to be aware of the factory they were looking for.

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Alex Shneyderman 2 August 2005 20:25:53 [ permanent link ]
 Alternatively, use spring for your business layer and stop worrying so much about how many data sources you have; actually you will stop worrying about much more but this is enough to start with :-)­

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Majohnst 2 August 2005 20:58:53 [ permanent link ]
 If I created an array of session factories, how would the interceptor know which one to use?
It looks like I would have to handle all the hibernate session stuff on the action level instead of on the interceptor level. I guess I could always make an action aware of the session factory by using HibernateSessionFac­tory1Aware and HibernateSessionFac­tory2Aware, but then I could not access both session factories from the same action.

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Paul Zepernick 2 August 2005 21:19:38 [ permanent link ]
 We have a servlet that runs on startup to create our session factory. This is an example of how to create 2 seperate session factory's:

[code]

/*
* Created on Oct 12, 2004
*
* TODO To change the template for this generated file go to
* Window - Preferences - Java - Code Style - Code Templates
*/
package com.iws.common;


import java.io.File;

import javax.servlet.Servl­etConfig;
import javax.servlet.http.­HttpServlet;
import javax.xml.parsers.D­ocumentBuilder;
import javax.xml.parsers.D­ocumentBuilderFactor­y;
import org.w3c.dom.Documen­t;

import net.sf.hibernate.Hi­bernateException;
import net.sf.hibernate.Se­ssionFactory;
import net.sf.hibernate.cf­g.Configuration;

/**
* @author paul zepernick
*
* TODO To change the template for this generated type comment go to
* Window - Preferences - Java - Code Style - Code Templates
*/
public class HibernateSessionFac­tory extends HttpServlet{
private static SessionFactory sessionFactory = null;
private static Configuration hibernateConfigruat­ion = null;
private static SessionFactory sessionFactoryECI = null;
private static Configuration hibernateConfigruat­ionECI = null;

/**
*Build the hibernate session factory
*
*/

public void init(ServletConfig configs){
Document ECIDocument = null;
DocumentBuilder builder = null;
try {


System.out.println(­"Initializing Hibernate");

//setup DEFAULT factory for the IWS MSSQL DB
hibernateConfigruat­ion = new Configuration();
sessionFactory = hibernateConfigruat­ion.configure().buil­dSessionFactory();

//setup the ECI session Factory for the DBC/FS database
File xmlFile = null;
// System.out.println(­"System Path: " + ApplicationData.get­Var("AppInstallPath"­));
xmlFile = new File(ApplicationDat­a.getVar("AppInstall­Path") + "/WEB-INF/classes/h­ibernate.cfg.ECI.xml­");
builder = DocumentBuilderFact­ory.newInstance().ne­wDocumentBuilder();
ECIDocument = builder.parse(xmlFi­le);
hibernateConfigruat­ionECI = new Configuration();
sessionFactoryECI = hibernateConfigruat­ionECI.configure(ECI­Document).buildSessi­onFactory();



System.out.println(­"Finished Initializing Hibernate");
} catch (HibernateException­ e) {
System.out.println(­"FATAL ERROR: HIBERNATE FAILED TO START");
e.printStackTrace()­;
/* }catch(ParserConfig­urationException ex){
ex.printStackTrace(­);
}catch(IOException ex){
ex.printStackTrace(­);*/
}catch(Exception ex){
ex.printStackTrace(­);
}
}

/**
*Close the hibernate session factory.
*
*/
public void destroy(){
try{
sessionFactory.clos­e();
} catch (HibernateException­ e) {
System.out.println(­"FATAL ERROR: HIBERNATE SESSION FACTORY FAILED TO STOP");
e.printStackTrace()­;
}
super.destroy();
}



/**
* @return Returns the sessionFactory.
*/
public static SessionFactory getSessionFactory()­ {
return sessionFactory;
}
/**
* @return Returns the hibernateConfigruat­ion.
*/
public static Configuration getHibernateConfigr­uation() {
return hibernateConfigruat­ion;
}
public static Configuration getHibernateConfigr­uationECI() {
return hibernateConfigruat­ionECI;
}
public static SessionFactory getSessionFactoryEC­I() {
return sessionFactoryECI;
}
}


[/code]

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Jay Bose 2 August 2005 23:15:29 [ permanent link ]
 The end user of this mutiple-SF component would have to know which SF dealt with the datasource they were interested in. This is why I'd use a Map, which i could use a unique ID for each specific SF.

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QAIX > Java Programming > Hibernate and Multiple Session Factories 8 May 2008 09:35:40
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