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Hibernate Criteria isNull
Posted on: April 11, 2011 at 12:00 AM
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In this tutorial you will learn about the hibernate criteria isNull

Hibernate Criteria isNull

The Hibernate Criteria Is Null value is used to check whether the given value is null.

Criteria criteria = session.createCriteria(Student.class);
	criteria.add(Restrictions.isNull("name"));
	List list = criteria.list();

An example based on Hibernate Criteria isNull is given below

CriteriaIsNull.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 CriteriaIsNull {
	public static void main(String[] args) {
		Session session = HibernateUtil.getSessionFactory().openSession();
		Criteria criteria = session.createCriteria(Student.class);
		criteria.add(Restrictions.isNull("name"));
		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:

Hibernate: select this_.roll_no as roll1_0_0_, this_.name as name0_0_, this_.course as course0_0_, this_.address as address0_0_ from student this_ where this_.name is null

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