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 Post subject: Hibernate Listener not working when changes made through DB
PostPosted: Sat Sep 03, 2016 2:45 am 
Newbie

Joined: Sat Sep 03, 2016 2:32 am
Posts: 3
I am new to Hibernate. I have found out that we can have event listener in Hibernate which will notify us of changes made on DB. What I am interested in is Will the Java code be called if I am not doing any DB changes through Java application but only through DB. Here is what I have coded::

Hibernate CFG file and Corresponding HBM file
Code:
<session-factory>
  <property name="hibernate.connection.driver_class">com.microsoft.sqlserver.jdbc.SQLServerDriver</property>
  <property name="hibernate.connection.url"></property>
  <property name="hibernate.connection.username"></property>
  <property name="hibernate.connection.password"></property>
  <property name="hibernate.connection.pool_size"></property>
  <property name="show_sql">true</property>
  <property name="dialect">org.hibernate.dialect.SQLServer2008Dialect</property>
  <!-- Mapping files -->
  <mapping resource="hbm/ps.hbm.xml"/>

    <listener type="post-insert" class="com.Dummy"/>

</session-factory>
</hibernate-configuration>
<hibernate-mapping>
<class name="com.Bean" table="Demo">
    <id name="id" type="string" column="ID" />
    <property name="name" type="string" column="NAME"></property>
</class>


Listener Class implementing PostInsertListener::
Code:
import org.hibernate.Session;
import org.hibernate.event.PostInsertEvent;
import org.hibernate.event.PostInsertEventListener;


public class Dummy implements PostInsertEventListener
{
     /**
     *
     */
    private static final long serialVersionUID = 1L;

    @Override
    public void onPostInsert(PostInsertEvent event) {
        // TODO Auto-generated method stub
        System.out.println(event.getEntity() instanceof Bean);
        System.out.println("Inside onPostInsert");
        Session session = event.getSession();
        System.out.println(session.toString());
    }
}


Main Class::
Code:
public class Run {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        try{
        System.out.println("Here");
        Configuration cfg = new Configuration().configure();
        SessionFactory factory = cfg.buildSessionFactory();
        Session session =     factory.openSession();
        Transaction tx = session.beginTransaction();
        Bean bean= new Bean();
        bean.setId("4");
        bean.setName("Dummy");
        System.out.println("Before Insert");
        session.save(bean);
        System.out.println("After Save");
        tx.commit();
        System.out.println("After Commit");
        session.close();
        factory.close();
    }
        catch(Exception e){
            e.printStackTrace();
        }
    }
}


The code works magic when i run the main class Inserts into DB as it should call the onPostInsert method as expected but if i run the application and make changes from DB ie insert a column the Console doesnt print anything. Is there something I am missing?? I am using SQL server...are there any compatibility issue with SQL server?? It is a plain java application nothing much


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 Post subject: Re: Hibernate Listener not working when changes made through DB
PostPosted: Sat Sep 03, 2016 5:27 am 
Hibernate Team
Hibernate Team

Joined: Thu Sep 11, 2014 2:50 am
Posts: 1638
Location: Romania
Hibernate listeners work only when you do changes through the Hibernate API. If you need to intercept any DB statement (from a console or from other apps), you need to use database triggers.

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If you liked my answer, you are going to love my High-Performance Java Persistence book and my blog as well.


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