Hibernate Projection Example (Sum)
In this section, you will learn to hibernate aggregate
function like: sum() using hibernate projection.
The following example to calculate the sum of
invested_amount to the Insurance table
Table Name: Insurance
Here is the code of program:
package roseindia.tutorial.hibernate;
import java.util.List;
import org.hibernate.Criteria;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.hibernate.criterion.ProjectionList;
import org.hibernate.criterion.Projections;
public class ProjectionExample1 {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Session sess = null;
try {
SessionFactory fact = new Configuration().configure().buildSessionFactory();
sess = fact.openSession();
Criteria crit = sess.createCriteria(Insurance.class);
ProjectionList proList = Projections.projectionList();
proList.add(Projections.sum("investementAmount"));
crit.setProjection(proList);
List sumResult = crit.list();
System.out.println("Total Invested Amount: " + sumResult);
}
catch(Exception e){
System.out.println(e.getMessage());
}
}
}
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Download this
Code.
Output:
| log4j:WARN No appenders
could be found for logger (org.hibernate.cfg.Environment).
log4j:WARN Please initialize the log4j system properly.
Hibernate: select
sum(this_.invested_amount) as y0_ from insurance this_
Total Invested Amount: [51400]
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