Hi, I'm new to Hibernate and I am trying to map a simple database.
I've used the Hibernate Synchronizer plugin for eclipse to generate the mapping files, but I keep getting this exception when I run the program:
Code:
Exception in thread "main" org.hibernate.MappingException: Repeated column in mapping for entity: com.opus.hibernate.Atividade column: id_projeto (should be mapped with insert="false" update="false")
at org.hibernate.mapping.PersistentClass.checkColumnDuplication(PersistentClass.java:605)
at org.hibernate.mapping.PersistentClass.checkPropertyColumnDuplication(PersistentClass.java:627)
at org.hibernate.mapping.PersistentClass.checkColumnDuplication(PersistentClass.java:645)
at org.hibernate.mapping.PersistentClass.validate(PersistentClass.java:420)
at org.hibernate.mapping.RootClass.validate(RootClass.java:192)
at org.hibernate.cfg.Configuration.validate(Configuration.java:1099)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1284)
at com.opus.hibernate.base._BaseRootDAO.initialize(_BaseRootDAO.java:101)
at com.opus.hibernate.base._BaseRootDAO.initialize(_BaseRootDAO.java:88)
at com.opus.hibernate.base._BaseRootDAO.initialize(_BaseRootDAO.java:79)
at com.opus.hibernate.Hibernate_Test.main(Hibernate_Test.java:14)
The .hbm.xml files that are the cause of the above exception are:
atividade.hbm.xml:
Code:
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd" >
<hibernate-mapping package="com.opus.hibernate">
<class
name="Atividade"
table="atividade"
>
<meta attribute="sync-DAO">true</meta>
<id
name="Id"
type="java.lang.Long"
column="id_atividade"
>
<generator class="sequence"/>
</id>
<property
name="NmAtividade"
column="nm_atividade"
type="string"
not-null="true"
length="255"
/>
<property
name="NumHoras"
column="num_horas"
type="java.lang.Long"
not-null="true"
length="4"
/>
<property
name="NumMinutos"
column="num_minutos"
type="java.lang.Long"
not-null="true"
length="4"
/>
<property
name="DtAtividade"
column="dt_atividade"
type="date"
not-null="true"
length="4"
/>
<many-to-one
name="IdFase"
class="FaseProjeto"
not-null="true"
>
</many-to-one>
<many-to-one
name="IdProjeto"
column="id_projeto"
class="Projeto"
not-null="true"
>
</many-to-one>
<many-to-one
name="IdUsuario"
column="id_usuario"
class="Usuario"
not-null="true"
>
</many-to-one>
</class>
</hibernate-mapping>
FaseProjeto.hbm.xml
Code:
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD//EN"
"/usr/local/hibernate-3.2/src/org/hibernate/hibernate-mapping-3.0.dtd" >
<hibernate-mapping package="com.opus.hibernate">
<class
name="FaseProjeto"
table="fase_projeto"
>
<meta attribute="sync-DAO">true</meta>
<composite-id name="Id" class="FaseProjetoPK">
<key-property
name="IdFase"
column="id_fase"
type="java.lang.Long"
/>
<key-many-to-one
name="IdProjeto"
class="Projeto"
column="id_projeto"
/>
</composite-id>
<property
name="NmFase"
column="nm_fase"
type="string"
not-null="false"
length="30"
/>
</class>
</hibernate-mapping>
I believe that the problem is that I am trying to get a foreign key from the FaseProjeto table, but because that key is a composite-id, then I must create 2 columns referencing both keys form FaseProjeto instead of just the key that I want (id_fase).
The problem is that I want to select have just id_fase as a foreign key from FaseProjeto and not id_fase and id_projeto. Is there a way to select only id_fase to be my foreign key?
Thanks,
Komg
PS: I am using Hibernate 3.2
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