Examples of javax.persistence.criteria.CriteriaBuilder.construct()

Class javax.persistence.criteria.CriteriaBuilder

Examples of javax.persistence.criteria.CriteriaBuilder.construct()

javax.persistence.criteria.CriteriaBuilder.construct()
Create a selection item corresponding to a constructor. This method is used to specify a constructor that will be applied to the results of the query execution. If the constructor is for an entity class, the resulting entities will be in the new state after the query is executed. @param resultClass class whose instance is to be constructed @param selections arguments to the constructor @return compound selection item @throws IllegalArgumentException if an argument is atuple- or array-valued selection item


        // Get results using custom class
        CriteriaQuery<OrderProducer> constructQuery = qb.createQuery(OrderProducer.class);
        Root<Order> order2 = constructQuery.from(Order.class);
        Join<Item, Producer> producer2 = order.join(Order_.items).join(Item_.producer);
        constructQuery.select(qb.construct(OrderProducer.class, order2, producer2));
        constructQuery.where(qb.equal(order2.get(Order_.filled), Boolean.TRUE));
        TypedQuery<OrderProducer> typedQuery = em.createQuery(constructQuery);
        List<OrderProducer> constructResults = typedQuery.getResultList();


        assertEquals(N_ORDERS / 2 * N_ITEMS_PER_ORDER, jpqlResults.size());

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        // Get results using custom class
        CriteriaQuery<OrderProducer> constructQuery = qb.createQuery(OrderProducer.class);
        Root<Order> order2 = constructQuery.from(Order.class);
        Join<Item, Producer> producer2 = order.join(Order_.items).join(Item_.producer);
        constructQuery.select(qb.construct(OrderProducer.class, order2, producer2));
        constructQuery.where(qb.equal(order2.get(Order_.filled), Boolean.TRUE));
        TypedQuery<OrderProducer> typedQuery = em.createQuery(constructQuery);
        List<OrderProducer> constructResults = typedQuery.getResultList();


        assertEquals(N_ORDERS / 2 * N_ITEMS_PER_ORDER, jpqlResults.size());

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