Hibernate中HQL的統計查詢

Java代碼 

import java.util.Iterator;
import java.util.List;

import junit.framework.TestCase;

import org.hibernate.Query;
import org.hibernate.SQLQuery;
import org.hibernate.Session;

import cn.edu.ahau.mgc.hibernate.factory.HibernateSessionFactory;

public class TestCount extends TestCase {


    public void test2() {
        Session session = null;
        try {
            session = HibernateSessionFactory.getSession();
            List<Object[]> results = session.createQuery("select c.id,c.name,count(s) from Student s join s.classes c group by c.id, c.name").list();
            for (Iterator<Object[]> iterator = results.iterator(); iterator.hasNext();) {
                Object[] result = iterator.next();
               Long countLong=(Long)result[2];//需轉爲long對象
               Integer count=Integer.parseInt(countLong.toString());
                System.out.println("----ID:" + result[0] + ";Name:" + result[1] + "Students Count:" + count);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            HibernateSessionFactory.closeSession();
        }
    }

}