Question

I need to check if a row exists in a database in a very fast way.
Let’s say I’ve got the primary key.
I found this code snippet in Hibernate’s FAQ website:

Integer count = (Integer) session.createQuery("select count(*) from ....").uniqueResult();

I just started using spring, so I have HibernateTemplate object injected into my class.
How do I translate this snippet to work with HibernateTemplate.

Does anyone knows a better/faster way than this ?

Thanks.

Answer 1

Long count = hibernateTemplate.execute(new HibernateCallback<Long>() {
    @Override
    public Long doInHibernate(Session session) {
        return (Long) session.createQuery("select count(someEntity.id) from SomeEntiuty someEntity ...").uniqueResult();
    }
});

Hibernate used Integer for count queries before, but now uses Long. Also, note that even if not deprecated, Spring recommends not to use HibernateTemplate anymore and use the Hibernate API directly (using sessionFactory.getCurrentSession()).