How do I count the total records using Projections?

By Wayan in Hibernate 0 Comment

The example below show how to get total row count using the Projections.rowCount(). The result of this query will be a single object of Integer that contains the result of executing an SQL select count (*) command.

package org.kodejava.example.hibernate.criteria;

import org.hibernate.SessionFactory;
import org.hibernate.Session;
import org.hibernate.HibernateException;
import org.hibernate.Criteria;
import org.hibernate.criterion.Projections;
import org.hibernate.cfg.AnnotationConfiguration;
import org.kodejava.example.hibernate.model.Track;

import java.util.List;

public class ProjectionsCountDemo {
    private static final SessionFactory sessionFactory;

    static {
        try {
            sessionFactory = new AnnotationConfiguration().
                    configure("hibernate.cfg.xml").
                    buildSessionFactory();
        }
        catch (Throwable ex) {
            throw new ExceptionInInitializerError(ex);
        }
    }

    public static Session getSession() throws HibernateException {
        return sessionFactory.openSession();
    }

    @SuppressWarnings("unchecked")
    public static void main(String[] args) {
        final Session session = getSession();
        try {
            Criteria criteria = session.createCriteria(Track.class)
                    .setProjection(Projections.rowCount());

            List result = criteria.list();
            if (!result.isEmpty()) {
                Integer rowCount = (Integer) result.get(0);
                System.out.println("Total records: " + rowCount);
            }
        } finally {
            session.close();
        }
    }
}

Wayan

Programmer, runner, recreational diver, live in the island of Bali, Indonesia. Mostly programming in Java, creating web based application with Spring Framework, Hibernate / JPA.

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