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composite-id && session.get

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arelendil

Post subject: composite-id && session.get

Posted: Fri Oct 06, 2006 3:20 am

Newbie

Joined: Tue Jun 27, 2006 9:34 am
Posts: 9
Location: St. Petersburg

what do i need to place in session.get(class, serializable) when my serializable consists of two integer?

Mapping:

Code:

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
        "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
        "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping default-lazy="false">
  <class name="com.Elcom.tables.Contacts.OrganisationContact" table="OrganisationContacts">
    <composite-id>
      <key-property name="person" type="integer" column="person_id"/>
      <key-property name="organisation" type="integer" column="org_id"/>
    </composite-id>
    <many-to-one name="person" class="com.Elcom.tables.Contacts.Person" insert="false" update="false">
      <column name="person_id"/>
    </many-to-one>
    <many-to-one name="organisation" class="com.Elcom.tables.Organisation" column="org_id" insert="false" update="false"/>
    <property name="job" type="string" length="50"/>
  </class>
</hibernate-mapping>

I need function with interface:

Code:

OrganisationContact getOrganisatonContactById(Long org_id, Long person_id)

Should I use HQL query? Or I can use session.get somehow?

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JayeshJ

Post subject:

Posted: Fri Oct 06, 2006 4:08 am

Regular

Joined: Tue May 16, 2006 3:32 am
Posts: 117

From Hibernate reference doc: -

"Unfortunately, this approach to composite identifiers means that a persistent object is its own identifier. There is no convenient "handle" other than the object itself. You must instantiate an instance of the persistent class itself and populate its identifier properties before you can load() the persistent state associated with a composite key. We call this approach an embedded composite identifier, and discourage it for serious applications. "

So that means that you'll have to do something like:

OrganisationContact organisationContact = new OrganisationContact();
organisationContact.setPerson(....);
organisationContact.setOrganisation(...)

and then use this object in session.get

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pushnpop

Post subject: finding the same error

Posted: Thu Oct 19, 2006 8:49 am

Newbie

Joined: Tue Jun 20, 2006 3:01 am
Posts: 4

i am doing the same with setting the properties but its giving me the error
org.hibernate.MappingException: Unknown entity: com.ess.sing.mvi.md.hibernate.system.gui.GuiFormTabsId

in my case i am having 2 properties in my PrimaryKeyClass formName and the tabIndex

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