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Carek
 Post subject: creating tables with hibernate
PostPosted: Fri Feb 19, 2010 10:54 am 
Newbie

Joined: Wed Oct 14, 2009 5:16 am
Posts: 5
Hi.

My question is - Is it possible to configure hibernate so that it creates a table when I try to save a class which is mapped to non existing table?
If it's possible then how?

My configuration file looks like this so far:

Code:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
      "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
      "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
    <session-factory name="session">
        <property name="hibernate.connection.driver_class">net.sourceforge.jtds.jdbc.Driver</property>
        <property name="hibernate.connection.url">jdbc:jtds:sqlserver://PLKRK-W-CRC0190:1279/HibernateDB</property>
        <property name="hibernate.connection.username">testuser</property>
        <property name="hibernate.dialect">org.hibernate.dialect.SQLServerDialect</property>
        <property name="hibernate.connection.password">pass</property>
        <property name="hibernate.hbm2ddl.auto">create-drop</property>
    </session-factory>
</hibernate-configuration>


main goal is to make this code to work:

Code:
Example e1 = new Example();
//filling field of e1
Example e2 = new Example();
//filling field of e2
      
Session session = factory.openSession();

Transaction tx = session.beginTransaction();
session.save(e1);
session.save(e2);
tx.commit();
      
session.close();


stack trace when I try to run the test:
Code:
org.hibernate.MappingException: Unknown entity: hibernate.test.Example1
   at org.hibernate.impl.SessionFactoryImpl.getEntityPersister(SessionFactoryImpl.java:580)
   at org.hibernate.impl.SessionImpl.getEntityPersister(SessionImpl.java:1365)
   at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:121)
   at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:210)
   at org.hibernate.event.def.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:56)
   at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:195)
   at org.hibernate.event.def.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:50)
   at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:93)
   at org.hibernate.impl.SessionImpl.fireSave(SessionImpl.java:562)
   at org.hibernate.impl.SessionImpl.save(SessionImpl.java:550)
   at org.hibernate.impl.SessionImpl.save(SessionImpl.java:546)
   at hibernate.test.HibernateTest.createDB(HibernateTest.java:29)
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
   at java.lang.reflect.Method.invoke(Unknown Source)
   at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
   at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
   at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
   at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
   at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
   at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:31)
   at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:73)
   at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:46)
   at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:180)
   at org.junit.runners.ParentRunner.access$000(ParentRunner.java:41)
   at org.junit.runners.ParentRunner$1.evaluate(ParentRunner.java:173)
   at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
   at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:31)
   at org.junit.runners.ParentRunner.run(ParentRunner.java:220)
   at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:46)
   at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
   at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
   at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
   at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
   at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
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Carek
 Post subject: Re: creating tables with hibernate
PostPosted: Mon Feb 22, 2010 5:45 am 
Newbie

Joined: Wed Oct 14, 2009 5:16 am
Posts: 5
I don't want to sound rude or desperate, but pls help... Anyone?
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kavithakaran
 Post subject: Re: creating tables with hibernate
PostPosted: Mon Feb 22, 2010 7:05 am 
Beginner
Beginner

Joined: Wed Nov 21, 2007 8:02 am
Posts: 48
Quote:
<property name="hibernate.hbm2ddl.auto">create-drop</property>


The above option tells hibernate to create table.
However you have to create a mapping file(Example.hbm.xml) and hibernate will use that file to create the table.

And also don't forget to include the mapping file name in hibernate.cfg.xml

The following tutorial does exactly that with the in memory hsql database
http://docs.jboss.org/hibernate/core/3.3/reference/en/html/tutorial.html
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Carek
 Post subject: Re: creating tables with hibernate
PostPosted: Mon Feb 22, 2010 8:25 am 
Newbie

Joined: Wed Oct 14, 2009 5:16 am
Posts: 5
thanks a lot for answer... I'll check on that tutorial. I was afraid that I will need another configuration file (mapping file in this case).

Originally I was aiming to do as little xml's etc as I can (I thought that it's possible to configure hibernate through annotations only)... I guess I was wrong.
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kavithakaran
 Post subject: Re: creating tables with hibernate
PostPosted: Mon Feb 22, 2010 8:31 am 
Beginner
Beginner

Joined: Wed Nov 21, 2007 8:02 am
Posts: 48
I haven't used annotations. But if you are using annotations, you don't need the mapping file to generate tables.

I think you have to specify this in your session factory.

Code:
<mapping class="xx.xx.xx.ClassName"/>
.
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Carek
 Post subject: Re: creating tables with hibernate
PostPosted: Mon Feb 22, 2010 9:00 am 
Newbie

Joined: Wed Oct 14, 2009 5:16 am
Posts: 5
Gosh... our servers went down a minute before I checked your reply :( ahhh... never mind... I will check that later...

I assume you meant something like this:

Code:
@Before
   public void init() {
      Configuration cfg = new Configuration();
      cfg.addClass(Example1.class);
      cfg.buildMappings();
          factory = cfg.configure().buildSessionFactory();
   }


I will let you know what I found later ;)
P.S. thanks a lot for help. I really appreciate that
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