Hi,

unfortunately I didn't found a solution for a basically question how does relationships or better the many-to-one element look like if you use <composite-id>s.

The following mapping was firstly created with Hibernate Tool...and looks now like this:

<class name="Field" table="fld_field">
<composite-id name="oid" class="myorg.as.jlibs.oid.Oid">
<key-property name="high" type="long" column="fld_oid_high" />
<key-property name="low" type="long" column="fld_oid_low" />
</composite-id>

<many-to-one name="parent" class="Field" fetch="select">
<column name="fld_parent_high" />
<column name="fld_parent_low" />
</many-to-one>

<component name="parentOid" class="myorg.as.jlibs.oid.Oid">
<property name="high" column="fld_parent_high" insert="false" update="false" />
<property name="low" column="fld_parent_low" insert="false" update="false" />
</component>
<property name="timestamp" type="timestamp" update="true">
<column name="fld_ts" length="6" />
</property>
<property name="name" type="string">
<column name="fld_name" />
</property>
<property name="deleted" type="integer">
<column name="fld_deleted" not-null="true" />
</property>
<set name="children" inverse="true">
<key>
<column name="fld_parent_high" />
<column name="fld_parent_low" />
</key>
<one-to-many class="Field" />
</set>
</class>
</hibernate-mapping>

...................................................................................................................................................

My problem is, that I cann't save Field objects
...
Oid oid = new Oid(1L,1L);
Field root = (Field)session.load(Field.class, oid);

Oid newOid = OIDUtil.getOid();
Field newField = new Field( newOid );
newField.setName("Linux");
newField.setDeleted(0);

newField.setParent(root);
session.save(newField);
...
and the log doesn't help much.

I think in the mapping file I also must change the many-to-one element so that hibernate can connect
the columns fld_parent_high and fld_parent_low with the composite class Oid's properties high and low. I think the best solution would be to introduce the class Oid in the many-to-one element.
<many-to-one name="parent" class="Field" fetch="select">
<column name="fld_parent_high" />
<column name="fld_parent_low" />
</many-to-one>

Can help someone?

P.S.
my field table:
That's the table:
CREATE TABLE fld_field(
fld_oid_high BIGINT NOT NULL,
fld_oid_low BIGINT NOT NULL,
fld_parent_high BIGINT,
fld_parent_low BIGINT,fld_name varchar(255) default '',fld_deleted INT default 0 NOT NULL,fld_ts timestamp DEFAULT now,
PRIMARY KEY (fld_oid_high, fld_oid_low),
FOREIGN KEY (fld_parent_high, fld_parent_low) REFERENCES fld_field(fld_oid_high,fld_oid_low) )

What is the error message? log output?