Just an idea, but maybe the
Query query = entityManager.createQuery(qDef);
Should come after this:
List<Order> orderList = makeOrderList(builder,
qDef.from(persistentClass), orderFields);
if (!orderList.isEmpty()) {
qDef.orderBy(orderList);
}
?
Cheers,
John
----
Who is General Failure, and why is he reading my hard disk?
> -----Original Message-----
> From: Miguel Muñoz [mailto:swingguy1...@yahoo.com]
> Sent: Thursday, May 30, 2013 11:08 AM
> To: users@openjpa.apache.org
> Subject: Ordering results obtained through query-by-example
>
> Comrades,
>
> I'm using the OpenJPA query-by-example API, and it works fine unless I
> order my results. When I do that, I get way too many results. If I search
> without specifying an order, I get 4 results from a table of 9 rows. If I
> specify
> an order, I get 36 results instead. (I get everything four times.) The number
> I
> get is always the number I'm supposed to get multiplied by the number of
> rows.
>
> Has anybody else seen this behavior? I'm trying to figure out if I'm doing
> something wrong, or if it's a bug in the JPA code.
>
> Here's my method, if you're interested:
>
> private final Class<E> persistentClass;
>
> public List<E> findByExample(
> @NotNull E exampleInstance,
> @Nullable Attribute<E,?>[] excludeProperty,
> SingularAttribute<E,?>. orderFields
> ) throws DAORuntimeException {
> EntityManager entityManager = JpaUtil.getEntityManager();
> OpenJPACriteriaBuilder builder = (OpenJPACriteriaBuilder)
> entityManager.getCriteriaBuilder();
> CriteriaQuery<E> qDef =
> builder.createQuery(persistentClass);
> Root<E> from = qDef.from(persistentClass);
> qDef.select(from);
> qDef.where(builder.qbe(from, exampleInstance,
> excludeProperty)); // query by example
> Query query = entityManager.createQuery(qDef);
>
> List<Order> orderList = makeOrderList(builder,
> qDef.from(persistentClass), orderFields);
> if (!orderList.isEmpty()) {
> qDef.orderBy(orderList);
> }
>
> return (List<E>) query.getResultList();
> }
>
> private List<Order> makeOrderList(
> CriteriaBuilder builder,
> Root<E> root,
> SingularAttribute<E, ?>[] pOrderFields
> ) {
> List<Order> orderList = new LinkedList<>();
> for (SingularAttribute<E, ?> attribute: pOrderFields) {
> orderList.add(builder.asc(root.get(attribute)));
> }
> return orderList;
> }
>
>
> If I call it like this, it works fine:
>
> List<Incident> dIncidentList =
> incidentDao.findByExample(dExample, null);
>
> If I call it like this, it returns lots of duplicates:
>
> List<Incident> dIncidentList =
> incidentDao.findByExample(dExample, null, Incident_.entryTime);
>
> Is it me? Has anyone else seen this bug?
>
>
> -------------------------------------------
>
> Miguel Muñoz
> swingguy1...@yahoo.com
> 323/225-7285
>
> -------------------------------------------
>
> The Sun, with all those planets revolving around it and dependent on it, can
> still ripen a vine of grapes like it had nothing else to do in the world.
>
> -- Galileo
>
> -------------------------------------------
>
> There are seven sins in the world.
> Wealth without work.
> Pleasure without conscience.
> Knowledge without character.
> Commerce without morality.
> Science without humanity.
> Worship without sacrifice.
> Politics without principle.
>
> -- Mohandas Gandhi
>
> -------------------------------------------
>
> If tyranny and oppression come to this land, it will come in the guise of
> fighting a foreign enemy.
>
> -- James Madison
>
>
