Hibernate count rows with some criterias

Question

Suppose I have a table Person and i want to count all those people whose \"birthDate\" is not null and they are a student. Assuming i have two columns :

birthDat         


        

Answer 1

Criteria crit = session.createCriteria(Person.class);
crit.add( Restrictions.isNotNull("birthDate"));
crit.add( Restrictions.eq("isStudent", true));
List<Person> students = crit.list();
Integer count = students.size();

or if just want a single count value, and no list returned :

Criteria crit = session.createCriteria(Person.class);
crit.setProjection(Projections.rowCount());
crit.add( Restrictions.isNotNull("birthDate"));
crit.add( Restrictions.eq("isStudent", true));
return (Long) crit.uniqueResult(); 

Answer 2

Criteria crit = session.createCriteria(Person.class);
crit.add( Restrictions.isNotNull("birthDate"));
crit.add( Restrictions.eq("isStudent", true));
crit.setProjection(Projections.rowCount());
Integer count = (Integer)crit.uniqueResult();

Answer 3

Use it. It's working

public class IncIncidentListGridModel
{

    private String historyStatus = null;

    public String getHistoryStatus()
    {
        return historyStatus;
    }

    public void setHistoryStatus(String historyStatus)
    {
        this.historyStatus = historyStatus;
    }

    public void run()
    {
        IncIncidentListGridModel resultCount =
            (IncIncidentListGridModel) ((SQLQuery) hibersession
                .createSQLQuery("select count(ch.incident_capa_history_id) as historyStatus  from incident_capa_history ch, incident_capa ic where ic.incident_capa_id = ch.FK_incident_capa_id and ic.incident_capa_id='011'"))
                .addScalar("historyStatus", Hibernate.STRING)
                .setResultTransformer(
                    Transformers.aliasToBean(IncIncidentListGridModel.class))
                .uniqueResult();

        System.out.println("count result" + resultCount.getHistoryStatus());
    }
}

Answer 4

int result= (int)((long)session.createQuery("select count(p) from User p where p.mobileNumber = :pMobileNumber")
                 .setParameter("pMobileNumber", mobileNumber).uniqueResult());

Answer 5

Criteria crit = session.createCriteria(Person.class);
crit.setProjection(Projections.rowCount());
crit.add( Restrictions.isNotNull("birthDate"));
crit.add( Restrictions.eq("isStudent", true));
return (Long) crit.uniqueResult();

The (Long)crit.uniqueResult() will cause NonUniqueResultException. I check the crit.list(). It is an ArrayList having 2 items. The first item of the arraylist contains the count. The second item always contains a 0. Is it the expected result of rowCount?

Thanks

Answer 6

Number count = (Number) session.createQuery(
    "select count(p.id) from Person p"
    + " where p.birthDate is not null and p.isStudent = true").uniqueResult();