Hibernate Criteria Projections

The Hibernate Criteria Projection contains all the projections instances. You can add many projection in to it by calling setProjection() method.

ProjectionList projectionList = Projections.projectionList();
	projectionList.add(Projections.property("rollNo"));
	projectionList.add(Projections.property("name"));
	projectionList.add(Projections.property("course"));
	criteria.setProjection(projectionList);

Please consider the given example on projection

CriteriaProjection.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.ProjectionList;
import org.hibernate.criterion.Projections;

public class CriteriaProjection {
	public static void main(String[] args) {
		Session session = HibernateUtil.getSessionFactory().openSession();
		Criteria criteria = session.createCriteria(Student.class);
		ProjectionList projectionList = Projections.projectionList();
		projectionList.add(Projections.property("rollNo"));
		projectionList.add(Projections.property("name"));
		projectionList.add(Projections.property("course"));
		criteria.setProjection(projectionList);
		List list = criteria.list();
		Iterator iterator = list.iterator();
		System.out.println("\n");
		System.out.print("\tRoll No");
		System.out.print("\t");
		System.out.print("\tName");
		System.out.print("\t");
		System.out.print("\tCourse");
		System.out.print("\t");
		System.out.println();
		while (iterator.hasNext()) {
			System.out.println("");
			Object[] objects = (Object[]) iterator.next();
			for (int i = 0; i < objects.length; i++) {
				System.out.print("|\t" + objects[i] + "\t");
			}
		}
	}
}

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