Reloading ONE TO ONE...!!!

mcorleone · **Joined:** Thu Jul 14, 2005 10:11 am **Posts:** 32

Hibernate version: 3.0.5 !!

Mapping documents:

Cliente.hbm.xml....:

Code:

         <property name="idEmpresa" column="idEmpresa" not-null="true" type="integer"/>  
        
      <many-to-one name="Empresa" column="idEmpresa" class="clientes.Empresa" update="false" insert="false" /> 

Empresa.hbm.xml...:

Code:

      <bag name="Empleados" inverse="false">
         <key column="idEmpresa" update="false" />
         <one-to-many class="clientes.Cliente" />
      </bag> 

Code between sessionFactory.openSession() and session.close():

Code:

session.merge(o);
session.flush();
session.refresh(o);   

The problem is that...
- Loading objects works fine. If i load a Client, Hibernate instantiates the Enterprise... but...
- If i update a client, hibernate won't refresh the Enterprise object. I keep the id, but the >> object << is not refreshed.

Ideas!?

Thanks!

vgiguere · **Posted:** Wed Sep 28, 2005 5:02 pm

I believe this is due to your cascade attribute.

Maybe you can post you mapping documents entirely, but this is an excerpt from the documentation:

Quote:

For each basic operation of the Hibernate session - including persist(), merge(), saveOrUpdate(), delete(), lock(), refresh(), evict(), replicate() - there is a corresponding cascade style. Respectively, the cascade styles are named create, merge, save-update, delete, lock, refresh, evict, replicate. If you want an operation to be cascaded along an association, you must indicate that in the mapping document

I hope this helps you solve your problem

Regards,
Vincent.

mcorleone · **Joined:** Thu Jul 14, 2005 10:11 am **Posts:** 32

thanks for your reply!!!.

I tryed with cascade="all" and nothing. My entire mappings are:

Client mapping

Code:

<hibernate-mapping>

   <class name="clientes.Cliente" table="Clientes">   
         
         <id name="id" column="id" type="integer"> 
             <generator class="native"/>
          </id>
           
        <property name="Activo" column="Activo" not-null="true" type="boolean"/>                                                                
        <property name="Comentarios" column="Comentarios" not-null="false" length="400" type="string"/>                
      <property name="Direccion" column="Direccion" not-null="true" length="200" type="string"/>               
        <property name="EMail" column="EMail" not-null="false" length="50" type="string"/>                
        <property name="Fax" column="Fax" not-null="false" length="20" type="string"/>                
        <property name="Telefono" column="Telefono" not-null="true" length="20" type="string"/>                                       
         <property name="Login" column="Login" not-null="false" length="20" type="string" />                 
      <property name="Password" column="Password" not-null="false" length="20" type="string"/>        
      <property name="Nombre" column="Nombre" not-null="true" length="20" type="string"/>                
      <property name="Apellido" column="Apellido" not-null="false" length="20" type="string"/>                      
      <property name="TipoDocumento" column="TipoDocumento" not-null="true" type="integer"/>                      
         <property name="NumeroDocumento" column="NumeroDocumento" not-null="true" type="integer"/>            
      <property name="Celular" column="Celular" not-null="false" length="20" type="string"/>      
        <property name="CUILoCUIT" column="CUILoCUIT" not-null="true" type="boolean"/>                                                                             
      <property name="NumeroCUILoCUIT" column="NumeroCUILoCUIT" length="50" not-null="true" type="string"/>                              
        <property name="AccesoWeb" column="AccesoWeb" not-null="true" type="boolean"/>                                                                             

         <property name="idEmpresa" column="idEmpresa" not-null="true" type="integer"/>  
        
      <many-to-one name="Empresa" column="idEmpresa" class="clientes.Empresa" update="false" insert="false" /> 

   </class>

</hibernate-mapping>

Enterprise mapping:

Code:

<hibernate-mapping>

    <class name="clientes.Empresa" table="Empresas">

         <id name="id" column="id" type="integer"> 
             <generator class="native"/>
          </id>
           
        <property name="Activo" column="Activo" not-null="true" type="boolean"/>                                                                
        <property name="Comentarios" column="Comentarios" not-null="false" length="400" type="string"/>                
      <property name="Direccion" column="Direccion" not-null="true" length="200" type="string"/>               
        <property name="EMail" column="EMail" not-null="false" length="50" type="string"/>                
        <property name="Fax" column="Fax" not-null="false" length="20" type="string"/>                
        <property name="Telefono" column="Telefono" not-null="true" length="20" type="string"/>                                       
         
      <!-- Datos de la Empresa -->

      <property name="Denominacion" column="Denominacion" not-null="true" length="100" type="string"/>        
      <property name="RazonSocial" column="RazonSocial" not-null="true" length="100" type="string"/>        
      <property name="SitioWeb" column="SitioWeb" not-null="false" length="50" type="string"/>                
      <property name="CUIT" column="CUIT" not-null="true" type="string"/>                              
          
      <bag name="Empleados" inverse="false">
         <key column="idEmpresa" update="false" />
         <one-to-many class="clientes.Cliente" />
      </bag>  
                
    </class>

</hibernate-mapping>

Thanks a lot, really...!!!

vgiguere · **Posted:** Thu Sep 29, 2005 4:39 pm

I was looking at your mapping. Why do you keep a property on the empresaId and a relationship to the Empresa? This seems redundant to me.

Code:

 <property name="idEmpresa" column="idEmpresa" not-null="true" type="integer"/> 
       
      <many-to-one name="Empresa" column="idEmpresa" class="clientes.Empresa" update="false" insert="false" />

Also, could you post your java code. I am curious to see how refresh your entity and also what makes you think that the object does not change...

If you mean that the hashcode of the object does not change, that is expected and correct. If you mean that you change an attribute and it does not show, then, it's strange.

Post the code and I'll take a look at it.

Vincent.

mcorleone · **Joined:** Thu Jul 14, 2005 10:11 am **Posts:** 32

Vincent,

I've got two properties because it's a web app. Basically, i can't keep the track of the 'related object' in an html form... i can keep only the ID.

When i modify something, i get setted the ID via web. I can't put a java-object in an html combo box.

The java code is really simple. This is from my class Cliente (Client):

Code:

   public String update(){      
   
      HibernateUtil.update(this);   
      new Log((Map)ActionContext.getContext().get("session"),"Modificacion de Cliente [" + nombre +"]");            
      addActionMessage("Modificacion exitosa");
      System.out.println("Empresa: " + e);
      return SUCCESS;
   }   

And this is from HibernateUtil:

Code:

   public static void update(Object o){
      HibernateUtil.beginTransaction();
      Session session = HibernateUtil.getSession();                           

      session.merge(o);
      session.flush();
      session.refresh(o);   
   }

If i load an object, everything works fine. The proxy gets instantiated and i can read the 'related object'.

But... when i update an object... because of the architecture of my framework (webwork), a whole new object gets instantiated, with the attributes sent by the client's browser. So, i get only 'idEmpresa'. I needed to 'refresh' the association because the hibernate-proxy gets lost on the way.

Thanks again Vincent..!!!

George

vgiguere · **Posted:** Thu Sep 29, 2005 5:04 pm

Ok. I understand better now what you are doing.
Have you tried initalizing the Empresa object using the Hibernate object?:

Code:

 
public String update(){         
      HibernateUtil.update(this);
      Hibernate.initialize(this.getEmpresa()); 
      return SUCCESS;
   } 

What happens ?

mcorleone · **Joined:** Thu Jul 14, 2005 10:11 am **Posts:** 32

I've just tried the 'Hibernate.initialize' method. No results... :(

It's just that the pointer to Empresa is null when the update() method is called.

I've got a simple idea... i guess i'll have to load manually the related-objects with a hql select.

I'm REALLY thankful. Really !!!

George,
Buenos Aires, Argentina