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Hibernate Criteria Transformer
Posted on: April 13, 2011 at 12:00 AM
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In this tutorial you will learn about Hibernate Criteria Transformer

Hibernate Criteria Transformer

A Hibernate Criteria Transformer is an interface which allow you to transform any result of Hibernate Criteria element.

Criteria criteria = session.createCriteria(Student.class);
	criteria.add(Restrictions.eq("name", "Vikash"));
	criteria.setResultTransformer(Criteria.DISTINCT_ROOT_ENTITY);	

An example of Criteria Transformer is given below

CriteriaTransformer.java

package net.roseindia.main;

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

import net.roseindia.bean.Student;
import net.roseindia.util.HibernateUtil;

import org.hibernate.Criteria;
import org.hibernate.Session;
import org.hibernate.criterion.Restrictions;

public class CriteriaTransformer {
	public static void main(String[] args) {
		Session session = HibernateUtil.getSessionFactory().openSession();
		Criteria criteria = session.createCriteria(Student.class);
		criteria.add(Restrictions.eq("name", "Vikash"));
		criteria.setResultTransformer(Criteria.DISTINCT_ROOT_ENTITY);
		List list = criteria.list();
		Iterator iterator = list.iterator();
		while (iterator.hasNext()) {
			Student student = (Student) iterator.next();
			System.out.println(student.getName());
		}
	}
}

When you run this application it will display message as shown below:

select this_.roll_no as roll1_0_, this_.name as name0_0_, this_.course as course0_0_, this_.address as address0_0_, this_.addmision_date as addmision5_0_0_ from student this_ where this_.name=?
Vikash

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