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 Hibernate > Hibernate Query Language > Where Null Clause

Where Null Clause 

The following example shows using HQL where null clause. Refer first example for the configuration and mapping.

File Name  :  
com/bethecoder/tutorials/hibernate/basic/tests/HQLNullTest.java 
Author  :  Sudhakar KV
Email  :  kvenkatasudhakar@gmail.com
   
package com.bethecoder.tutorials.hibernate.basic.tests;

import java.util.List;
import org.hibernate.Session;
import com.bethecoder.tutorials.hibernate.basic.Company;
import com.bethecoder.tutorials.hibernate.basic.util.HibernateUtil;

public class HQLNullTest {

  /**
   @param args
   */
  public static void main(String[] args) {

    getCompanies("from Company comp where comp.address1 is null");
    getCompanies("from Company comp where comp.address1 is not null");
  }

  private static void getCompanies(String hql) {
    Session session = HibernateUtil.getSessionFactory().openSession();
    session.beginTransaction();
    
    List<Company> companies = (List<Company>session.createQuery(hql).list();    
    System.out.println("Selected row count : " + companies.size());
    
    for (Company company : companies) {
      System.out.println(company);
    }
    
    session.getTransaction().commit();
    session.close();
  }
}
   

It gives the following output,
Selected row count : 1
{ id = 9, name = CFR, employeeCount = 478, 
	projectCount = 2487, address1 = null, address2 = add2443 }
	
	
Selected row count : 9
{ id = 1, name = PQR, employeeCount = 3430, 
	projectCount = 220, address1 = add1@, address2 = add2 }
{ id = 2, name = ABC, employeeCount = 23430, 
	projectCount = 160, address1 = add11, address2 = add22 }
{ id = 3, name = MNO, employeeCount = 26790, 
	projectCount = 670, address1 = add111, address2 = add222 }
{ id = 4, name = IJK, employeeCount = 67890, 
	projectCount = 850, address1 = add1112, address2 = add2223 }
{ id = 5, name = ART, employeeCount = 67890, 
	projectCount = 850, address1 = add1112, address2 = add2223 }
{ id = 6, name = RNK, employeeCount = 98890, 
	projectCount = 8478, address1 = add1412, address2 = add27823 }
{ id = 7, name = AOQ, employeeCount = 97890, 
	projectCount = 4578, address1 = add17892, address2 = add2893 }
{ id = 8, name = BQO, employeeCount = 9778, 
	projectCount = 487, address1 = add1459, address2 = add2443 }
{ id = 10, name = CFR, employeeCount = 6478, 
	projectCount = 887, address1 = , address2 = add24435 }


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