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Distinct Clause
The following example shows using HQL distinct clause.
Refer first example for the configuration and mapping.
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package com.bethecoder.tutorials.hibernate.basic.tests;
import java.util.List;
import org.hibernate.Session;
import com.bethecoder.tutorials.hibernate.basic.util.HibernateUtil;
public class HQLDistinctTest {
/**
* @param args
*/
public static void main(String[] args) {
Session session = HibernateUtil.getSessionFactory().openSession();
session.beginTransaction();
String HQL_QUERY = "select count(distinct comp.name), count(comp.name) from Company comp";
Object[] row = (Object[]) session.createQuery(HQL_QUERY).uniqueResult();
System.out.println("Unique Company name Count : " + row[0]);
System.out.println("Company name Count : " + row[1]);
HQL_QUERY = "select distinct comp.name from Company comp";
List<?> uniqueAddress = session.createQuery(HQL_QUERY).list();
System.out.println("Unique Company names : " + uniqueAddress);
HQL_QUERY = "select comp.name from Company comp";
List<?> address = session.createQuery(HQL_QUERY).list();
System.out.println("Company names : " + address);
session.getTransaction().commit();
session.close();
}
}
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It gives the following output,
Unique Company name Count : 9
Company name Count : 10
Unique Company names : [PQR, ABC, MNO, IJK, ART, RNK, AOQ, BQO, CFR]
Company names : [PQR, ABC, MNO, IJK, ART, RNK, AOQ, BQO, CFR, CFR]
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