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Need help in first work with Hibernate

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siri

Post subject: Need help in first work with Hibernate

Posted: Thu May 01, 2008 5:59 pm

Newbie

Joined: Thu May 01, 2008 4:53 pm
Posts: 11

Hi EveryOne,

This is my first posting in this forum.Thanks for helping learners like this.
I downloaded hibernate-3.2.6 and i working with eclipse3.3,oracle10g and JRE 1.6.
Is it necessary to download any plugins for hibernate to use in eclipse ?
I wrote a simple java application using hibernate.To write that code i took some help of a website.Here is my directory structure...

HibernatePro1
l
l__src
l l
l l_ events
l l l_ Event.java
l l l
l l l_ Event.hbm.xml
l l
l l_ client
l l l_ TestClient.java
l l l
l l l_ EventManager.java
l l
l l__Event.cfg.xml
l l
l l
l l__log4j.properties
l
l
l__+JRE System Library
l
l__+Hibernate User Library

I included all my hibernate .jar files in "Hibernate User Library"

Now when i try to run TestClient.java i am getting exception like below

Code:

17:12:05,062  INFO Environment:514 - Hibernate 3.2.6
17:12:05,093  INFO Environment:547 - hibernate.properties not found
17:12:05,156  INFO Environment:681 - Bytecode provider name : cglib
17:12:05,171  INFO Environment:598 - using JDK 1.4 java.sql.Timestamp handling
17:12:05,390  INFO Configuration:1432 - configuring from resource: /hibernate.cfg.xml
17:12:05,390  INFO Configuration:1409 - Configuration resource: /hibernate.cfg.xml
[color=red]Exception in thread "main" org.hibernate.HibernateException: /hibernate.cfg.xml not found
   at org.hibernate.util.ConfigHelper.getResourceAsStream(ConfigHelper.java:147)
   at org.hibernate.cfg.Configuration.getConfigurationInputStream(Configuration.java:1411)
   at org.hibernate.cfg.Configuration.configure(Configuration.java:1433)
   at org.hibernate.cfg.Configuration.configure(Configuration.java:1420)
   at client.TestClient.openSession(TestClient.java:23)
   at client.TestClient.main(TestClient.java:48)
[/color]

Is there any wrong with my directory structure ?
Can any one please help me in solving this problem.
This is first posting so if there any mistakes in my posting Please forgive me.

Thank q very much,
sirisha.

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aunghtain

Post subject:

Posted: Thu May 01, 2008 9:58 pm

Newbie

Joined: Thu May 01, 2008 9:34 pm
Posts: 7

The directory that contains hibernate.cfg.xml file must be on the java classpath.

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siri

Post subject: To save all rows in table using hibernate

Posted: Sun May 04, 2008 12:19 am

Newbie

Joined: Thu May 01, 2008 4:53 pm
Posts: 11

Thanks,
I solved this problem by adding hibernate.properties file to my src folder and by changing names of Event.cfg.xml and Event.hbm.xml to hibernate.cfg.xml and hibernate.hbm.xml.Now it's working fine now.

But now i have another problem with logic of my code.I am placing my client programs here please check these once.

Code:

package client;
import org.hibernate.*;
import org.hibernate.cfg.Configuration;
import events.*;
public class TestClient
{
public Event buildEvent()
{
 Event event = new Event();
 event.setEventTitle("Environmental Meet");
 event.setTotalMembers(100);
 return event;
}
public Session openSession()
{
  SessionFactory sessionFactory = new Configuration().configure().buildSessionFactory();
  Session session =sessionFactory.openSession();
  return session;
}
public Event testSaveEvent(EventManager manager) 
{
  Event event = buildEvent();
  manager.saveEvent(event);
  System.out.println("Event saved with ID = "+event.getEventId());
  return event;
}
public static void main(String[] args) 
{
  TestClient client = new TestClient();
  Session session = client.openSession();
  EventManager manager = new EventManager(session);
  Event event = client.testSaveEvent(manager);
   System.out.println("End of Program");
  session.flush();
}
}

and

Code:

package client;

import org.hibernate.Session;
import events.Event;
public class EventManager
{
   private Session session = null;

   public EventManager(Session session)
   {
   if(session == null)
   throw new RuntimeException("Invalid session object. Cannot instantiate the EventManager.");
   this.session = session;
   }

   public void saveEvent(Event event)
   {
   session.save(event);
   }
}

Now my problem is...
1. when i try to save a row by using these classes,all those previous values(entered from Oracle) are getting deleted.Now my table is having only one row which is entered through this classes.
2. After this i changed entry values for that table fields in my class and now i run this client program once again.Now my previously entered row in step1 was deleted and now my table contains new row only.
At any time i am getting only one row in my table.But i want to save all those rows in my table.

What is wrong with my code.Can any one please help me..

Thank q very much,
sirisha.

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sagimann

Post subject: question

Posted: Sun May 04, 2008 3:11 am

Senior

Joined: Sun Jun 11, 2006 10:41 am
Posts: 164

Could you post your hibernate config files? My theory is that you may be using the hbm2ddl property set to 'drop-create'... so every time you execute your app, the entire db gets re-initialized... You should set this property to 'create' only.

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siri

Post subject:

Posted: Mon May 05, 2008 10:40 am

Newbie

Joined: Thu May 01, 2008 4:53 pm
Posts: 11

Hi Sagimann,
Thank q very much.You are correct,problem in my code was hbm2ddl.auto property. I removed following tag in hibernate.cfg.xml

<property name="hbm2ddl.auto">create</property>

Now it's working fine.

Thanks,
siri.

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