HQL Group By Clause Example

Group by clause is used to return the aggregate values by grouping on returned component. HQL supports Group By Clause.

HQL Group By Clause Example

HQL Group By Clause Example

     

Group by clause is used to return the aggregate values by grouping on returned component. HQL supports Group By Clause. In our example we will calculate the sum of invested amount in each insurance type. Here is the java code for calculating the invested amount insurance wise:


 

 

 

 
package roseindia.tutorial.hibernate;
import org.hibernate.Session;
import org.hibernate.*;
import org.hibernate.cfg.*;
import java.util.*;
/**
 * @author Deepak Kumar
 * 
 * http://www.roseindia.net 
HQL Group by Clause Example
 *  
 */
public class HQLGroupByExample {
  public static void main(String[] args) {
  Session session = null;
  try {
  // This step will read 
hibernate.cfg.xml and prepare hibernate for
  // use
  SessionFactory sessionFactory = 
new Configuration().configure()
  .buildSessionFactory();
  session = sessionFactory.openSession();
  //Group By Clause Example
  String SQL_QUERY = "select sum
(insurance.investementAmount),
insurance.insuranceName "
  + "from Insurance insurance 
group by insurance.insuranceName";
 Query query = session.createQuery(SQL_QUERY);
 for (Iterator it = 
query.iterate(); it.hasNext();) {
 Object[] row = (Object[]) it.next();
 System.out.println("
Invested Amount: " + row[0]);
 System.out.println("
Insurance Name: " + row[1]);
  }
  session.close();
  } catch (Exception e) {
  System.out.println(e.getMessage());
  } finally {
  }
  }
}

To run the example select Run-> Run As -> Java Application from the menu bar. Following out is displayed in the Eclipse console:

Hibernate: select sum(insurance0_.invested_amount) as col_0_0_, insurance0_.insurance_name as col_1_0_ from insurance insurance0_ group by insurance0_.insurance_name

Invested Amount: 3500

Insurance Name: Car Insurance

Invested Amount: 500

Insurance Name: Dental Insurance

Invested Amount: 1550

Insurance Name: Home Insurance

Invested Amount: 1500

Insurance Name: Life Insurance

Invested Amount: 1600

Insurance Name: Medical Insurance

Invested Amount: 1680

Insurance Name: Motorcycle Insurance

Invested Amount: 2600

Insurance Name: Travel Insurance

Tutorials

  1. Why hibernate is used?
  2. Hibernate Native SQL Example
  3. Hibernate Update Query
  4. Hibernate Delete Query
  5. Hibernate Count Query
  6. Writing First Hibernate Code
  7. Running First Hibernate 3.0 Example
  8. Hibernate Book
  9. Understanding Hibernate O/R Mapping
  10. Using Hibernate to generate id incrementally
  11. Hibernate Query Language
  12. Preparing table for HQL Examples
  13. Writing ORM for Insurance table
  14. HQL from clause Example
  15. Hibernate Select Clause
  16. HQL Where Clause Example
  17. Hibernate Architecture
  18. HQL Group By Clause Example
  19. hibernateTemplate-Order Results
  20. Hibernate Criteria Query Example
  21. Hibernate How To
  22. Hibernate Quickly
  23. Hibernate 3.1.2 Released
  24. HQL Order By Example
  25. Hibernate 3.1.3 Released
  26. Hibernate 3.1.1 Released
  27. Introduction to Hibernate 3.0
  28. Complete Hibernate 3.0 and Hibernate 4 Tutorial
  29. Hibernate Avg() Function (Aggregate Functions)
  30. Hibernate Max() Function (Aggregate Functions)
  31. Hibernate Min() Function (Aggregate Functions)
  32. Hibernate Criteria Expression (eq)
  33. Hibernate Criteria Expression (lt)
  34. Hibernate Criteria Expression (le)
  35. Hibernate Criteria Expression (gt)
  36. Hibernate Criteria Expression (ge)
  37. Hibernate Criteria Expression (and)
  38. Hibernate Criteria Expression (or)
  39. Hibernate Projections (rowCount or countDistinct)
  40. Hibernate Projection Count