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How do I create a CriteriaQuery which returns the selected entities in the ascending order of an attribute?
You can define an ORDER BY clause with the orderBy method of the CriteriaQuery interface and the asc or desc method of the CriteriaBuilder interface.
The following CriteriaQuery returns Book entities in the ascending order of their title attribute.
// Define the CriteriaQuery CriteriaBuilder cb = em.getCriteriaBuilder(); CriteriaQuery<Book> cq = cb.createQuery(Book.class); Root<Book> root = cq.from(Book.class); cq.orderBy(cb.asc(root.get(Book_.title))); // Execute query with pagination List<Book> books = em.createQuery(cq).getResultList();
I get a CriteriaBuilder from the EntityManager and create a CriteriaQuery that returns Book entities.
Then I define the FROM clause by setting the Book entity as the Root of the query.
In the next step, I call the asc method on the CriteriaBuilder to create an ascending Order of the title attribute. The Book_ class, which I use to reference the title attribute, is part of the JPA metamodel. I then use the Order object to create the ORDER BY clause.
That’s all you need to do to define a CriteriaQuery with an ORDER BY clause. You can then use the CriteriaQuery to create and execute a TypedQuery.
Based on the CriteriaQuery, Hibernate generates the following SQL statement.
07:12:02,889 DEBUG [org.hibernate.SQL] - select book0_.id as id1_1_, book0_.publisherid as publishe5_1_, book0_.publishingDate as publishi2_1_, book0_.title as title3_1_, book0_.version as version4_1_ from Book book0_ order by book0_.title asc
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You can learn more about CriteriaQuerys with the following Hibernate Tips:
- Hibernate Tips: How to select a POJO with a Criteria Query
- Hibernate Tips: How to select multiple scalar values in a Criteria Query
- Hibernate Tips: How to Use a SubQuery in a CriteriaQuery
- Hibernate Tips: How to call a user-defined function in a CriteriaQuery
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