RE: [Hibernate] custom identifier class

[<phr...@im...>]

hi,

On Tue, 10 Dec 2002 10:34:30 +1100, "Gavin King" <Gav...@ex...>
said:
> Oh, so it isn't actually a composite key. I didn't understand
> properly then. Well, using a UserType is exactly the right 
> approach. You would also need to implement IdentifierGenerator
> to generate instances of PrimaryKey (your implementation could 
> just wrap up a built-in key generation strategy). This should
> work out perfectly - if you have any more problems let me know.
> 
> The mapping would be:
> 
> <id name="key" type="my.pkg.PrimaryKeyType">
>    <generator class="my.pkg.PrimaryKeyGenerator"/>
> </id>

i created my own PK generator, but i'm still getting the same exception i
had before:

cirrus.hibernate.PropertyAccessException: IllegalArgumentException
occurred while calling setter of test.hibernate.Foo.pk
at cirrus.hibernate.helpers.ReflectHelper.set(ReflectHelper.java:190)
at
cirrus.hibernate.persister.AbstractEntityPersister.setIdentifier(AbstractEntityPersister.java:281)
at cirrus.hibernate.impl.SessionImpl.doSave(SessionImpl.java:528)
at cirrus.hibernate.impl.SessionImpl.save(SessionImpl.java:483)
at cirrus.hibernate.impl.SessionImpl.saveOrUpdate(SessionImpl.java:919)
at
test.hibernate.ejb.HibTestSessionBean.saveFoo(HibTestSessionBean.java:53)

from Foo.hbm.xml:

<id type="test.hibernate.MyPrimaryKeyType" name="pk" column="id"
length="16" unsaved-value="null">
    <generator class="test.hibernate.MySequencePKGenerator">
	<param>MY_SEQ</param>
    </generator>
</id>

Foo.java has:

  public PrimaryKey getPk()
  public void setPk(PrimaryKey pk)
  (i tried adding setPk(Long), setPk(String), setPK(long) - that didnt
  chg the exception at all)


My pk generator extends SequenceGenerator, and overrides one method as
follows:

  public Serializable generate(SessionImplementor session, Object obj)
  throws SQLException, HibernateException {
	return new PrimaryKey( String.valueOf(super.generate(session, obj)) );
  }


the implementation of my UserType is as follows:

  private static final int[] TYPES = { Types.VARCHAR };

  public int[] sqlTypes() {
	return TYPES; 
  }

  public Class returnedClass() {
	return PrimaryKey.class;
  }

  public boolean equals(Object x, Object y) {
	if (x==y) return true;
	if (x==null || y==null) return false;
	return x.equals(y);
  }

  public Object nullSafeGet(ResultSet rs, String[] names, Object owner)
  throws HibernateException, SQLException {
	String id = (String) Hibernate.STRING.nullSafeGet(rs, names[0]);
	return id==null ? null : new PrimaryKey(id);
  }

  public void nullSafeSet(PreparedStatement st, Object value, int index)
  throws HibernateException, SQLException {
	String id = (value==null) ? null : ((PrimaryKey)value).getId();
	Hibernate.STRING.nullSafeSet(st, id, index);
  }

  public Object deepCopy(Object o) {
	if (o==null) return null;
	return new PrimaryKey( (PrimaryKey)o );
  }

  public boolean isMutable() {
	return false;
  }


any help would be appreciated :)

          viktor
-- 
  
  phr...@im...

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