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 Hibernate > Hibernate Query Language > When Simple Expression

When Simple Expression 

The following example shows using HQL when expression. Refer first example for the configuration and mapping.

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

import java.util.Arrays;
import java.util.Iterator;
import java.util.List;
import org.hibernate.Query;
import org.hibernate.Session;
import com.bethecoder.tutorials.hibernate.basic.util.HibernateUtil;

public class HQLWhenCaseTest {

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

    Session session = HibernateUtil.getSessionFactory().openSession();
    session.beginTransaction();
    
/*    String HQL_QUERY = "select " + 
        "case " +
          "when comp.projectCount > 500 " +
          "then 'Big Company' " +
          "else 'Small Company' " +
        "end" + 
        ", comp.name from Company comp";
*/  
    String HQL_QUERY = "select comp.name, comp.projectCount, " 
        "case " +
          "when comp.projectCount > 500 " +
          "then 'Big Company' " +
          "else 'Small Company' " +
        "end" 
        " from Company comp";
    
    Query query = session.createQuery(HQL_QUERY);
    
    List<?> rows = query.list();    
    Iterator<?> rowsIt = rows.iterator();
    Object [] row = null;
    
    while (rowsIt.hasNext()) {
      row = (Object []) rowsIt.next();
      System.out.println(Arrays.toString(row));
    }
    
    session.getTransaction().commit();
    session.close();
    
  }

}
   

It gives the following output,
[PQR, 220, Small Company]
[ABC, 160, Small Company]
[MNO, 670, Big Company]
[IJK, 850, Big Company]
[ART, 850, Big Company]
[RNK, 8478, Big Company]
[AOQ, 4578, Big Company]
[BQO, 487, Small Company]
[CFR, 2487, Big Company]
[CFR, 887, Big Company]


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