BE THE CODER > Hibernate > Criteria Queries

The following example shows creating an entity map from a projection list with aggregate values. Refer first example for the configuration and mapping.

File Name :	com/bethecoder/tutorials/hibernate/basic/criteria/CriteriaMapTest2.java
Author :	Sudhakar KV
Email :	[email protected]


package com.bethecoder.tutorials.hibernate.basic.criteria;



import java.util.Map;



import org.hibernate.Criteria;

import org.hibernate.Session;

import org.hibernate.criterion.Projections;

import org.hibernate.criterion.Property;

import org.hibernate.transform.Transformers;



import com.bethecoder.tutorials.hibernate.basic.Company;

import com.bethecoder.tutorials.hibernate.basic.util.HibernateUtil;



public class CriteriaMapTest2 {



  /**

   * @param args

   */

  public static void main(String[] args) {



    Session session = HibernateUtil.getSessionFactory().openSession();

    session.beginTransaction();

    

    Criteria criteria = session.createCriteria(Company.class);

    criteria.setProjection(Projections.projectionList()

            .add( Property.forName("name").count().as("company_count"))

            .add( Property.forName("employeeCount").avg().as("avg_employees") )

            .add( Property.forName("projectCount").max().as("max_project_count") )

      );

    criteria.setResultTransformer(Transformers.ALIAS_TO_ENTITY_MAP);

    

    Map stats = (Map) criteria.uniqueResult();

    System.out.println(stats);

    

    session.getTransaction().commit();

    session.close();  

  }

  

}

Entity Map2