<id name="id" type="integer" unsaved-value="null">
			<column name="id" sql-type="int" not- null ="true" />
			<generator  class ="identity" />
		</id>

 public   void  test3()  throws  Exception
            {

                 try 
                    {

                        Hibernate3Support.beginTransaction();

                        Hibernate3Support.currentSession().setFlushMode(FlushMode.NEVER);

                        Test test =  new  Test();

                        test.setName("t1");

                        Hibernate3Support.currentSession().save(test);

                         try 
                            {

                                 int  i= 1 / 0 ;

                            }
                         catch  (Exception e)
                            {
                                Hibernate3Support.rollbackTransaction();
                                 throw  e;
                            }

                        Hibernate3Support.commitTransaction();

                    }  finally 
                    {
                        Hibernate3Support.closeSession();
                    }

            }

< class  name="Test" table="test">

		<id name="id" type="integer" unsaved-value="null">
			<column name="id" sql-type="int" not- null ="true" />
			<generator  class ="identity" />
		</id>

		<property name="name" type="string">
			<column name="name" not- null ="false" />
		</property>
		
		<property name="txt" type="string">
			<column name="txt" not- null ="false" />
		</property>




	</ class >