Subclasses with differently named id columns

mindgutter · **Joined:** Fri Mar 18, 2005 3:23 pm **Posts:** 7

Read the rules before posting!
http://www.hibernate.org/ForumMailingli ... AskForHelp

I have an object heirarchy with a table per object where each subclass has a different name for the key.

Object (id column is org_id)
Organization (id column is org_id)
GovernmentOrg (id column is gov_id)
MilitaryOrg (id column is mil_org_id)

I would like to map this using join-subclass syntax, but am not sure if there is a way to specify that the id column is named differently for the subclasses. So for the military org, its id would be in the parent tables, just in differently named columns. Thanks in advance.

Hibernate version: 3.0rc1

Mapping documents:

Code:

<class name="Object" table="objects">
    <id name="objId" column="obj_id"/>
    <join-subclass name="Organization" table="organizations">
       <!--what should this be to map to org_id ??? -->
       <key column="obj_id"/>
        <property name="orgName" column="org_name"/>
        ...
        
        <join-subclass name="GovOrg" table="government_orgs">
            <!--what should this be to map to gov_id ???-->
            <key column="obj_id"/>
            <property name="governmentBranch" column="gov_branch"/>
            ...
            
            <join-subclass name="MilitaryOrg" table="military_orgs">
                <!--what should this be to map to mil_id ???-->
                <key column="obj_id"/>

            </join-subclass>
            
        </join-subclass>        
    </join-subclass>    
<class>

emmanuel · **Posted:** Fri Mar 25, 2005 12:34 pm

Code:

athu9999 · **Joined:** Mon Mar 28, 2005 12:58 pm **Posts:** 27

I'm also trying to do inheritance using hibernate 3.0 rc1:

Code:

@Entity
@Inheritance(strategy = InheritanceType.JOINED)
public class Person
{
    private String id;

    @Id
    @Column(name="person_id")
    public String getId()
    {
        return id;
    }
    ...
} 


@Entity
@Inheritance(strategy = InheritanceType.JOINED)
@InheritanceJoinColumn(name = "person_id")
public class CrazyPerson extends Person
{ 
    private String crazyId;

    public String getCrazyId()
    {
        return crazyId;
    }
}

I want to make the crazyId to be the same as the id in the parent class but I don't know how to do that using annotations. Essentially the originating post shows how to do it using XML but I haven't seen anything using annotations. Is this possible just using EJB3 annotations?

emmanuel · **Posted:** Tue Mar 29, 2005 5:27 am

Best solution
getCrazyId() { super.getId() }

Otherwise

@Column(name="person_id", insertable = false, upatable = "false")
getCrazyId()