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Null Expression Example


In this section, you will see the example of null expression in with JPQL (Java Persistence Query Language). In this example, we will use a JPQL query ("SELECT st FROM Student st WHERE st.scourse IS NULL"). This query retrieve all record that contains "scourse" file is null.

You need the following artifacts:

  1. Database Table: student
  2. Model Class: Student.java
  3. Main Class: JPANullExpression.java

Database Table: student

CREATE TABLE `student` ( 
`id` int(11) NOT NULL auto_increment, 
`sname` varchar(40) NOT NULL, 
`sroll` int(11) NOT NULL, 
`scourse` varchar(10) default NULL, 

Model Class: Student.java

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* and open the template in the editor.

package jpacrud;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;

* @author Administrator

public class Student implements java.io.Serializable {

private int id;

public int getId() {
return id;

public void setId(int id) {
this.id = id;

private String sname;

public String getSname() {
return sname;

public void setSname(String sname) {
this.sname = sname;

private int sroll;

public int getSroll() {
return sroll;

public void setSroll(int sroll) {
this.sroll = sroll;

private String scourse;

public String getScourse() {
return scourse;

public void setScourse(String scourse) {
this.scourse = scourse;


Main Class: JPANullExpression.java

* To change this template, choose Tools | Templates
* and open the template in the editor.

package jpacrud;

import java.util.Iterator;
import java.util.List;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.EntityTransaction;
import javax.persistence.Persistence;
import javax.persistence.Query;

* @author Administrator
public class JPANullExpression {
public static void main(String arg[]){
EntityManagerFactory emf=Persistence.createEntityManagerFactory("netjpa");
EntityManager em=emf.createEntityManager();
EntityTransaction entr=em.getTransaction();
Query query=em.createQuery("SELECT st FROM Student st WHERE st.scourse IS NULL");
List stEmtyList=query.getResultList();
Iterator stEmptyIterator=stEmtyList.iterator();
Student stu=(Student)stEmptyIterator.next();
System.out.print(" Roll:"+stu.getSroll());
System.out.print(" Course:"+stu.getScourse());
catch(Exception ex){



log4j:WARN No appenders could be found for logger (org.hibernate.cfg.annotations.Version).
log4j:WARN Please initialize the log4j system properly.
Hibernate: select student0_.id as id0_, student0_.scourse as scourse0_, student0_.sname as sname0_, student0_.sroll as sroll0_ from student student0_ where student0_.scourse is null

Name:Suman Roll:104 Course:null
Name:Noor Roll:105 Course:null
BUILD SUCCESSFUL (total time: 3 seconds)

Download Application


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