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one-to-one relationship problems

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nicolasst22

Post subject: one-to-one relationship problems

Posted: Tue Feb 22, 2011 9:03 am

Newbie

Joined: Thu Feb 17, 2011 5:08 pm
Posts: 6

Hello people... I have some problems with a one-to-one relationship...

I need map tables for to do cascade actions... More exactly when I set null the reference attribute Hibernate remove data from the reference table....

a simplified POJO is..

Code:

public class Persona{

public int id;
public String nombre;
public Cliente cliente;

gets and sets methods

}

public class Cliente{

public int id;
public String descripcion;
public Persona persona;

gets and sets methods

}

the behaviour that i want is:

On inserts... (new objects to persist)

When I set a cliente in persona (persona.setCliente(cliente)) Hibernates insert a row in Clientes table... is i don't set cliente... Hibernate inserts nothing..

On Deletes

Hiberte deletes the cliente asociated to persona... In other word when I remove a persona hibernate removes the cliente asociated in cascade... (if cliente exists)

On Edit an existent persona...

If I edit a existent persona and I Change cliente's attribute descripcion (persona.getCliente().setDescripcion("hello");) i want that Hibernate persist this change on my database... (sql update sentence)

but... when I set null the cliente on an existent persona (persona.setCliente(null);) I WANT HIBERNATE REMOVE THE CLIENTE OF MY DATABASE. HERE IS MY PROBLEM!!!!!!!!!!!

can you help me please??

My database schema is

Code:

Table Persona
int id (PK)
vachar nombre;
cliente_id (FK table cliente)

Table Clientes
int id (PK)
varchar descripcion
persona_id (FK table personas)

Thanks in advance

Regards

Nicolas

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overmeulen

Post subject: Re: one-to-one relationship problems

Posted: Tue Feb 22, 2011 9:39 am

Regular

Joined: Fri Jan 28, 2011 11:44 am
Posts: 117

Hi,

You need to add the cascade-style "delete-orphan" to your one-to-one mapping.
But this functionnality was implemented very recently by the hibernate team and only exists since version 3.5.0

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nicolasst22

Post subject: Re: one-to-one relationship problems

Posted: Sun Feb 27, 2011 1:31 pm

Newbie

Joined: Thu Feb 17, 2011 5:08 pm
Posts: 6

Hi!!

thanks for ask!!

I tried this.. delete-orphan works!! but I found new some problems...

When I edit a Persona Hibernate tries to insert a new Cliente causing PK constraint violation...

How I can do for Hibernate update the current Cliente and don't try to insert a new Cliente??

part of mapping code is
in Persona.hbm

Code:

 <class name="model.Persona" table="persona" schema="public">
        <id name="id" type="long">
            <column name="id" />
            <generator class="sequence">
                <param name="sequence">persona_id_seq</param>
            </generator>
        </id>

in Cliente.hbm

Code:

 <class name="model.Cliente" table="cliente" schema="public">
        <id name="id" type="long">
            <column name="id" />
            <generator class="foreign">
                <param name="property">persona</param>
            </generator>

        </id>
         <one-to-one name="persona" constrained="true" />

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