It seems to me that if you define a reference in a base class, and then
have another class that inherits from it, then the reference-descriptor
elements are not inherited.
For example, using the example at the end of the mail, if you query and
retrieve a User, you can use a getUserStatus() method to retrieve the
correct UserStatus object.
However, if you query and retrieve a Person, you can get the correct id
of the user status (using a getUserStatusId() method), but calling
getUserStatus() will return null.
Is this the correct behaviour, or have I made a mistake in the
configuration? If this is the correct behaviour, how could I work around
it? I'm sure this could be done using the "mapping each class to a
distinct table" inheritence strategy, but this would involve modifying
an existing database, which I am reluctant to do for compatability
reasons.
Example - please assume that relevent get/set methods are implemented
public class User
{
protected int id;
protected String username;
protected String password;
protected int userStatusId;
protected UserStatus userStatus;
}
public class Person extends User
{
protected String surname;
protected String forename;
}
public class UserStatus
{
protected int id;
protected String name;
}
<class-descriptor class="User" table="users">
<field-descriptor name="id" column="user_id"
jdbc-type="INTEGER" primarykey="true" autoincrement="true"/>
<field-descriptor name="username" column="username"
jdbc-type="VARCHAR"/>
<field-descriptor name="password" column="password"
jdbc-type="VARCHAR"/>
<field-descriptor name="userStatusId" column="status"
jdbc-type="INTEGER"/>
<reference-descriptor name="userLevel"
class-ref="com.mp.hato.ojb.OJBUserLevel" auto-retrieve="true">
<foreignkey field-ref="userLevelId"/>
</reference-descriptor>
</class-descriptor>
<class-descriptor class="Person" table="people">
<field-descriptor name="id" column="id"
jdbc-type="INTEGER" primarykey="true"/>
<field-descriptor name="surname"
column="surname" jdbc-type="VARCHAR"/>
<field-descriptor name="forename"
column="forename" jdbc-type="VARCHAR"/>
<reference-descriptor name="super"
class-ref="com.mp.hato.ojb.OJBUser" auto-retrieve="true"
auto-update="true" auto-delete="true">
<foreignkey field-ref="id"/>
</reference-descriptor>
</class-descriptor>
<class-descriptor class="UserStatus" table="user_status">
<field-descriptor name="id" column="id" jdbc-type="INTEGER"
primarykey="true"/>
<field-descriptor name="name" column="name" jdbc-type="VARCHAR"/>
</class-descriptor>
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