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Hibernate example source code file (AggregationResultTest.java)

This example Hibernate source code file (AggregationResultTest.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Hibernate tags/keywords

abstractmetamodelspecifictest, after, criteriabuilder, criteriaquery, criteriaquery, entitymanager, entitymanager, math, object, object, product, result, root, test, test

The Hibernate AggregationResultTest.java source code

/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * Copyright (c) 2010, Red Hat Inc. or third-party contributors as
 * indicated by the @author tags or express copyright attribution
 * statements applied by the authors.  All third-party contributions are
 * distributed under license by Red Hat Inc.
 *
 * This copyrighted material is made available to anyone wishing to use, modify,
 * copy, or redistribute it subject to the terms and conditions of the GNU
 * Lesser General Public License, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this distribution; if not, write to:
 * Free Software Foundation, Inc.
 * 51 Franklin Street, Fifth Floor
 * Boston, MA  02110-1301  USA
 */
package org.hibernate.ejb.criteria.basic;

import java.math.BigDecimal;
import java.math.BigInteger;
import javax.persistence.EntityManager;
import javax.persistence.criteria.CriteriaBuilder;
import javax.persistence.criteria.CriteriaQuery;
import javax.persistence.criteria.Root;
import junit.framework.AssertionFailedError;
import org.hibernate.ejb.metamodel.AbstractMetamodelSpecificTest;
import org.hibernate.ejb.metamodel.Product;
import org.hibernate.ejb.metamodel.Product_;

import org.junit.After;
import org.junit.Before;
import org.junit.Test;

/**
 * @author Steve Ebersole
 */
public class AggregationResultTest extends AbstractMetamodelSpecificTest {
	private CriteriaBuilder builder;

	@Before
	public void createTestData() {
		builder = entityManagerFactory().getCriteriaBuilder();

		EntityManager em = getOrCreateEntityManager();
		em.getTransaction().begin();
		Product product = new Product();
		product.setId( "product1" );
		product.setPrice( 1.23d );
		product.setQuantity( 1000 );
		product.setPartNumber( ( (long) Integer.MAX_VALUE ) + 1 );
		product.setRating( 1.999f );
		product.setSomeBigInteger( BigInteger.valueOf( 987654321 ) );
		product.setSomeBigDecimal( BigDecimal.valueOf( 987654.321 ) );
		em.persist( product );
		em.getTransaction().commit();
		em.close();
	}

	@After
	public void cleanUpTestData() throws Exception {
		EntityManager em = getOrCreateEntityManager();
		em.getTransaction().begin();
		em.createQuery( "delete Product" ).executeUpdate();
		em.getTransaction().commit();
		em.close();
	}

	/**
	 * Sum of Longs should return a Long
	 */
	@Test
	public void testSumOfLongs() {
		EntityManager em = getOrCreateEntityManager();
		em.getTransaction().begin();
		CriteriaQuery<Long> criteria = builder.createQuery( Long.class );
		Root<Product> productRoot = criteria.from( Product.class );
		criteria.select( builder.sum( productRoot.get( Product_.partNumber ) ) );
		Object sumResult = em.createQuery( criteria ).getSingleResult();
		assertReturnType( Long.class, sumResult );
		em.getTransaction().commit();
		em.close();
	}

	/**
	 * Sum of Integers should return an Integer; note that this is distinctly different than JPAQL
	 */
	@Test
	public void testSumOfIntegers() {
		EntityManager em = getOrCreateEntityManager();
		em.getTransaction().begin();
		CriteriaQuery<Integer> criteria = builder.createQuery( Integer.class );
		Root<Product> productRoot = criteria.from( Product.class );
		criteria.select( builder.sum( productRoot.get( Product_.quantity ) ) );
		Object sumResult = em.createQuery( criteria ).getSingleResult();
		assertReturnType( Integer.class, sumResult );
		em.getTransaction().commit();
		em.close();
	}

	/**
	 * Sum of Doubles should return a Double
	 */
	@Test
	public void testSumOfDoubles() {
		EntityManager em = getOrCreateEntityManager();
		em.getTransaction().begin();
		CriteriaQuery<Double> criteria = builder.createQuery( Double.class );
		Root<Product> productRoot = criteria.from( Product.class );
		criteria.select( builder.sum( productRoot.get( Product_.price ) ) );
		Object sumResult = em.createQuery( criteria ).getSingleResult();
		assertReturnType( Double.class, sumResult );
		em.getTransaction().commit();
		em.close();
	}

	/**
	 * Sum of Floats should return a Float; note that this is distinctly different than JPAQL
	 */
	@Test
	public void testSumOfFloats() {
		EntityManager em = getOrCreateEntityManager();
		em.getTransaction().begin();
		CriteriaQuery<Float> criteria = builder.createQuery( Float.class );
		Root<Product> productRoot = criteria.from( Product.class );
		criteria.select( builder.sum( productRoot.get( Product_.rating ) ) );
		Object sumResult = em.createQuery( criteria ).getSingleResult();
		assertReturnType( Float.class, sumResult );
		em.getTransaction().commit();
		em.close();
	}

	/**
	 * Sum of BigInteger should return a BigInteger
	 */
	@Test
	public void testSumOfBigIntegers() {
		EntityManager em = getOrCreateEntityManager();
		em.getTransaction().begin();
		CriteriaQuery<BigInteger> criteria = builder.createQuery( BigInteger.class );
		Root<Product> productRoot = criteria.from( Product.class );
		criteria.select( builder.sum( productRoot.get( Product_.someBigInteger ) ) );
		Object sumResult = em.createQuery( criteria ).getSingleResult();
		assertReturnType( BigInteger.class, sumResult );
		em.getTransaction().commit();
		em.close();
	}

	/**
	 * Sum of BigDecimal should return a BigDecimal
	 */
	@Test
	public void testSumOfBigDecimals() {
		EntityManager em = getOrCreateEntityManager();
		em.getTransaction().begin();
		CriteriaQuery<BigDecimal> criteria = builder.createQuery( BigDecimal.class );
		Root<Product> productRoot = criteria.from( Product.class );
		criteria.select( builder.sum( productRoot.get( Product_.someBigDecimal ) ) );
		Object sumResult = em.createQuery( criteria ).getSingleResult();
		assertReturnType( BigDecimal.class, sumResult );
		em.getTransaction().commit();
		em.close();
	}

	private void assertReturnType(Class expectedType, Object value) {
		if ( value != null && ! expectedType.isInstance( value ) ) {
			throw new AssertionFailedError(
					"Result value was not of expected type: expected [" + expectedType.getName()
							+ "] but found [" + value.getClass().getName() + "]"
			);
		}
	}
}

Other Hibernate examples (source code examples)

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