Hibernate execute update with criteria

Question

Is it possible to execute an update while using Criteria in Hibernate? For example:

Session session = getSession();
Criteria crit = session.createCriteria(User.class);
crit.add(Restrictions.eq("token", sessionToken));

User user= new User();
Transaction tx = session.getTransaction();
try 
{
    tx.begin();
    session.updateWithCriteria(user, crit); //my imaginary function 
    tx.commit();
}
catch (Exception e) 
{
    e.printStackTrace();
    tx.rollback();
}

session.close();

Answer 1

There is a very powerful feature called:

15.4. DML-style operations

small cite from doc:

... However, Hibernate provides methods for bulk SQL-style DML statement execution that is performed through the Hibernate Query Language...

So, while this is not about criteria - we still can use our domain model for querying, because it is about HQL. This is a snippet showing the power:

Session session = sessionFactory.openSession();
Transaction tx = session.beginTransaction();

String hqlUpdate = "update Customer c set c.name = :newName where c.name = :oldName";
// or String hqlUpdate = "update Customer set name = :newName where name = :oldName";
int updatedEntities = s.createQuery( hqlUpdate )
        .setString( "newName", newName )
        .setString( "oldName", oldName )
        .executeUpdate();
tx.commit();
session.close();

SUMMARY: Having that in place:

• we can use query to filter results
• we can apply bulk update on it
• we won't need to load these rows in memory, into the session...

Answer 2

Now we can do something like this for bulk update and delete. New api's released for criteriaUpdate and CriteriaDelete

CriteriaBuilder cb = this.em.getCriteriaBuilder();
// create update
CriteriaUpdate<Order> update = cb.createCriteriaUpdate(Order.class);
// set the root class
Root e = update.from(Order.class);
// set update and where clause
update.set("amount", newAmount);
update.where(cb.greaterThanOrEqualTo(e.get("amount"), oldAmount));
// perform update
this.em.createQuery(update).executeUpdate();