Re: many-to-one relation : help

Armin Waibel Thu, 26 Feb 2004 01:37:53 -0800

Hi Fernando,

I'm not an expert in the mapping stuff, so others can help more. OJB don't have an extra element for many-to-one, you can solve this by using a one to many reference (collection-descriptor) and one to one reference (reference-descriptor).

I never used Hibernate, what's the different between many-to-one reference from Many to Usuario and a one-to-one reference from Many to Usuario? In both cases you ask for many.getUsuario() - or I'm wrong?

regards,
Armin

Fernando Queiroz Fonseca wrote:

Hi Armin thank's for the previous aid, now functions, using to advantage the
email would like to know as it makes to inside map an object of a
class-descriptor, I until then used hibernate and in it it used the
following code in the describer:
<many-to-one name="usuario"
class="br.com.fernandoqueiroz.sgbd.negocio.Usuario" not-null="true">
            <column name="id_usuario"/>
</many-to-one>
I am thankful since already Obliged !

----- Original Message ----- From: "Armin Waibel" <[EMAIL PROTECTED]> To: "OJB Users List" <[EMAIL PROTECTED]> Sent: Wednesday, February 25, 2004 9:05 PM Subject: Re: Full Stack for : Can not init Identity for given object
Hi Fernando,

the exception message says what's going wrong
> Caused by:
org.apache.ojb.broker.metadata.ClassNotPersistenceCapableException:
org.apache.ojb.broker.util.sequence.HighLowSequence not found in OJB
Repository
>
If you use the SequenceManagerHighLowImpl for key generation, you need:
a) org.apache.ojb.broker.util.sequence.HighLowSequence class-descriptor
in your repository file
b) an table
CREATE TABLE OJB_HL_SEQ
(
    TABLENAME VARCHAR (175),
    FIELDNAME VARCHAR (70),
    MAX_KEY BIGINT,
    GRAB_SIZE integer,
    VERSION integer,
    PRIMARY KEY(TABLENAME,FIELDNAME)
);

<class-descriptor class="br.com.fernandoqueiroz.sgbd.negocio.Usuario"
table="TUSUARIO">

<field-descriptor sequence-name="MAX" name="id_usuario"
column="id_usuario" jdbc-type="INTEGER" primarykey="true"
autoincrement="true"/>
<field-descriptor name="usuario" column="usuario"
jdbc-type="VARCHAR"/>
  <field-descriptor name="senha" column="senha" jdbc-type="VARCHAR"/>
  <field-descriptor name="email" column="email" jdbc-type="VARCHAR"/>
  <field-descriptor name="cpf" column="cpf" jdbc-type="VARCHAR"/>
</class-descriptor>
<class-descriptor
class="br.com.fernandoqueiroz.sgbd.negocio.DadoPessoal"
table="TDADO_PESSOAL">
<field-descriptor name="id" column="ID_DADO_PESSOAL"
jdbc-type="INTEGER" primarykey="true" autoincrement="true"/>
  <field-descriptor name="nome" column="nome" jdbc-type="VARCHAR"/>
  <field-descriptor name="sobrenome" column="sobrenome"
jdbc-type="VARCHAR"/>

<field-descriptor name="nacionalidade" column="nacionalidade"
jdbc-type="VARCHAR"/>

<field-descriptor name="cidade_nascimento"
column="CIDADE_NASCIMENTO" jdbc-type="VARCHAR"/>
  <field-descriptor name="cpf" column="cpf" jdbc-type="VARCHAR"/>
  <field-descriptor name="data_nascimento" column="data_nascimento"
jdbc-type="VARCHAR"/>
  <field-descriptor name="sexo" column="sexo" jdbc-type="VARCHAR"/>
  <field-descriptor name="rg" column="rg" jdbc-type="VARCHAR"/>
  <field-descriptor name="rg_orgao" column="rg_orgao"
jdbc-type="VARCHAR"/>
  <field-descriptor name="rg_uf" column="rg_uf" jdbc-type="VARCHAR"/>
  <field-descriptor name="rg_data_emissao" column="rg_data_emissao"
jdbc-type="VARCHAR"/>

<field-descriptor name="nro_passaporte" column="nro_passaporte"
jdbc-type="VARCHAR"/>

<field-descriptor name="nome_pai" column="nome_pai"
jdbc-type="VARCHAR"/>

<field-descriptor name="nome_mae" column="nome_mae"
jdbc-type="VARCHAR"/>

<field-descriptor name="titulo_eleitor" column="titulo_eleitor"
jdbc-type="VARCHAR"/>

<field-descriptor name="secao_eleitor" column="secao_eleitor"
jdbc-type="VARCHAR"/>

<field-descriptor name="zona_eleitor" column="zona_eleitor"
jdbc-type="VARCHAR"/>

<field-descriptor name="nome_citacao" column="NOME_CITACAO"
jdbc-type="VARCHAR"/>

<reference-descriptor name="usuario"
class-ref="br.com.fernandoqueiroz.sgbd.negocio.Usuario">
      <foreignkey field-ref="id_usuario"/>
  </reference-descriptor>
</class-descriptor>
-------------------------------------------------------
Fernando Queiroz Fonseca
Analista e Programador Java/J2EE
Uberl�ndia - MG - Brasil
+55-0xx34-8801-9072
www.fernandoqueiroz.com.br
[EMAIL PROTECTED]
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Re: many-to-one relation : help

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