Hibernate example source code file (ExpressionsTest.java)

This example Hibernate source code file (ExpressionsTest.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, abstractqueryimpl, criteriaquery, criteriaquery, entitymanager, entitymanager, list, list, math, number, predicate, product, root, test, test, util

The Hibernate ExpressionsTest.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 javax.persistence.EntityManager;
import javax.persistence.TypedQuery;
import javax.persistence.criteria.CriteriaBuilder;
import javax.persistence.criteria.CriteriaQuery;
import javax.persistence.criteria.ParameterExpression;
import javax.persistence.criteria.Predicate;
import javax.persistence.criteria.Root;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.Collections;
import java.util.List;

import org.hibernate.Query;
import org.hibernate.ejb.metamodel.AbstractMetamodelSpecificTest;
import org.hibernate.ejb.metamodel.Phone;
import org.hibernate.ejb.metamodel.Product;
import org.hibernate.ejb.metamodel.Product_;
import org.hibernate.internal.AbstractQueryImpl;

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

import static org.junit.Assert.assertEquals;

/**
 * Tests that various expressions operate as expected
 *
 * @author Steve Ebersole
 */
public class ExpressionsTest extends AbstractMetamodelSpecificTest {
	private CriteriaBuilder builder;

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

		EntityManager em = getOrCreateEntityManager();
		em.getTransaction().begin();
		Product product = new Product();
		product.setId( "product1" );
		product.setPrice( 1.23d );
		product.setQuantity( 2 );
		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() {
		EntityManager em = getOrCreateEntityManager();
		em.getTransaction().begin();
		em.remove( em.find( Product.class, "product1" ) );
		em.getTransaction().commit();
		em.close();
	}

	@Test
	public void testEmptyConjunction() {
		EntityManager em = getOrCreateEntityManager();
		em.getTransaction().begin();
		CriteriaQuery<Product> criteria = builder.createQuery( Product.class );
		criteria.from( Product.class );
		criteria.where( builder.and() );
		List<Product> result = em.createQuery( criteria ).getResultList();
		assertEquals( 1, result.size() );
		em.getTransaction().commit();
		em.close();
	}

	@Test
	public void testEmptyConjunctionIsTrue() {
		EntityManager em = getOrCreateEntityManager();
		em.getTransaction().begin();
		CriteriaQuery<Product> criteria = builder.createQuery( Product.class );
		criteria.from( Product.class );
		criteria.where( builder.isTrue( builder.and() ) );
		List<Product> result = em.createQuery( criteria ).getResultList();
		assertEquals( 1, result.size() );
		em.getTransaction().commit();
		em.close();
	}

	@Test
	public void testEmptyConjunctionIsFalse() {
		EntityManager em = getOrCreateEntityManager();
		em.getTransaction().begin();
		CriteriaQuery<Product> criteria = builder.createQuery( Product.class );
		criteria.from( Product.class );
		criteria.where( builder.isFalse( builder.and() ) );
		List<Product> result = em.createQuery( criteria ).getResultList();
		assertEquals( 0, result.size() );
		em.getTransaction().commit();
		em.close();
	}

	@Test
	public void testEmptyDisjunction() {
		EntityManager em = getOrCreateEntityManager();
		em.getTransaction().begin();
		CriteriaQuery<Product> criteria = builder.createQuery( Product.class );
		criteria.from( Product.class );
		criteria.where( builder.disjunction() );
		List<Product> result = em.createQuery( criteria ).getResultList();
		assertEquals( 0, result.size() );
		em.getTransaction().commit();
		em.close();
	}

	@Test
	public void testEmptyDisjunctionIsTrue() {
		EntityManager em = getOrCreateEntityManager();
		em.getTransaction().begin();
		CriteriaQuery<Product> criteria = builder.createQuery( Product.class );
		criteria.from( Product.class );
		criteria.where( builder.isTrue( builder.disjunction() ) );
		List<Product> result = em.createQuery( criteria ).getResultList();
		assertEquals( 0, result.size() );
		em.getTransaction().commit();
		em.close();
	}

	@Test
	public void testEmptyDisjunctionIsFalse() {
		EntityManager em = getOrCreateEntityManager();
		em.getTransaction().begin();
		CriteriaQuery<Product> criteria = builder.createQuery( Product.class );
		criteria.from( Product.class );
		criteria.where( builder.isFalse( builder.disjunction() ) );
		List<Product> result = em.createQuery( criteria ).getResultList();
		assertEquals( 1, result.size() );
		em.getTransaction().commit();
		em.close();
	}

	@Test
	public void testDiff() {
		EntityManager em = getOrCreateEntityManager();
		em.getTransaction().begin();
		CriteriaQuery<Integer> criteria = builder.createQuery( Integer.class );
		criteria.from( Product.class );
		criteria.select( builder.diff( builder.literal( 5 ), builder.literal( 2 ) ) );
		Integer result = em.createQuery( criteria ).getSingleResult();
		assertEquals( Integer.valueOf( 3 ), result );
		em.getTransaction().commit();
		em.close();
	}

	@Test
	public void testDiffWithQuotient() {
		EntityManager em = getOrCreateEntityManager();
		em.getTransaction().begin();
		CriteriaQuery<Number> criteria = builder.createQuery( Number.class );
		criteria.from( Product.class );
		criteria.select(
				builder.quot(
						builder.diff(
								builder.literal( BigDecimal.valueOf( 2.0 ) ),
								builder.literal( BigDecimal.valueOf( 1.0 ) )
						),
						BigDecimal.valueOf( 2.0 )
				)
		);
		Number result = em.createQuery( criteria ).getSingleResult();
		assertEquals(0.5d, result.doubleValue(), 0.1d);
		em.getTransaction().commit();
		em.close();
	}

	@Test
	public void testSumWithQuotient() {
		EntityManager em = getOrCreateEntityManager();
		em.getTransaction().begin();
		CriteriaQuery<Number> criteria = builder.createQuery( Number.class );
		criteria.from( Product.class );
		criteria.select(
				builder.quot(
						builder.sum(
								builder.literal( BigDecimal.valueOf( 0.0 ) ),
								builder.literal( BigDecimal.valueOf( 1.0 ) )
						),
						BigDecimal.valueOf( 2.0 )
				)
		);
		Number result = em.createQuery( criteria ).getSingleResult();
		assertEquals(0.5d, result.doubleValue(), 0.1d);
		em.getTransaction().commit();
		em.close();
	}

	@Test
	public void testQuotientAndMultiply() {
		EntityManager em = getOrCreateEntityManager();
		em.getTransaction().begin();
		CriteriaQuery<Number> criteria = builder.createQuery( Number.class );
		criteria.from( Product.class );
		criteria.select(
				builder.quot(
						builder.prod(
								builder.literal( BigDecimal.valueOf( 10.0 ) ),
								builder.literal( BigDecimal.valueOf( 5.0 ) )
						),
						BigDecimal.valueOf( 2.0 )
				)
		);
		Number result = em.createQuery( criteria ).getSingleResult();
		assertEquals(25.0d, result.doubleValue(), 0.1d);

		criteria.select(
				builder.prod(
						builder.quot(
								builder.literal( BigDecimal.valueOf( 10.0 ) ),
								builder.literal( BigDecimal.valueOf( 5.0 ) )
						),
						BigDecimal.valueOf( 2.0 )
				)
		);
		result = em.createQuery( criteria ).getSingleResult();
		assertEquals(4.0d, result.doubleValue(), 0.1d);

		em.getTransaction().commit();
		em.close();
	}

	@Test
	public void testParameterReuse() {
		EntityManager em = getOrCreateEntityManager();
		em.getTransaction().begin();
		CriteriaQuery<Product> criteria = em.getCriteriaBuilder().createQuery( Product.class );
		Root<Product> from = criteria.from( Product.class );
		ParameterExpression<String> param = em.getCriteriaBuilder().parameter( String.class );
		Predicate predicate = em.getCriteriaBuilder().equal( from.get( Product_.id ), param );
		Predicate predicate2 = em.getCriteriaBuilder().equal( from.get( Product_.name ), param );
		criteria.where( em.getCriteriaBuilder().or( predicate, predicate2 ) );
		assertEquals( 1, criteria.getParameters().size() );
		TypedQuery<Product> query = em.createQuery( criteria );
		int hqlParamCount = countGeneratedParameters( query.unwrap( Query.class ) );
		assertEquals( 1, hqlParamCount );
		query.setParameter( param, "abc" ).getResultList();
		em.getTransaction().commit();
		em.close();
	}

	private int countGeneratedParameters(Query query) {
		AbstractQueryImpl hqlQueryImpl = (AbstractQueryImpl) query;
		return hqlQueryImpl.getParameterMetadata().getNamedParameterNames().size();
	}

	@Test
	public void testInExplicitTupleList() {
		EntityManager em = getOrCreateEntityManager();
		em.getTransaction().begin();
		CriteriaQuery<Product> criteria = builder.createQuery( Product.class );
		Root<Product> from = criteria.from( Product.class );
		criteria.where( from.get( Product_.partNumber ).in( Collections.singletonList( ((long)Integer.MAX_VALUE) + 1 ) ) );
		List<Product> result = em.createQuery( criteria ).getResultList();
		assertEquals( 1, result.size() );
		em.getTransaction().commit();
		em.close();
	}

	@Test
	public void testInExplicitTupleListVarargs() {
		EntityManager em = getOrCreateEntityManager();
		em.getTransaction().begin();
		CriteriaQuery<Product> criteria = builder.createQuery( Product.class );
		Root<Product> from = criteria.from( Product.class );
		criteria.where( from.get( Product_.partNumber ).in( ((long)Integer.MAX_VALUE) + 1 ) );
		List<Product> result = em.createQuery( criteria ).getResultList();
		assertEquals( 1, result.size() );
		em.getTransaction().commit();
		em.close();
	}

	@Test
	public void testInExpressionVarargs() {
		EntityManager em = getOrCreateEntityManager();
		em.getTransaction().begin();
		CriteriaQuery<Product> criteria = builder.createQuery( Product.class );
		Root<Product> from = criteria.from( Product.class );
		criteria.where( from.get( Product_.partNumber ).in( from.get( Product_.partNumber ) ) );
		List<Product> result = em.createQuery( criteria ).getResultList();
		assertEquals( 1, result.size() );
		em.getTransaction().commit();
		em.close();
	}

	@Test
	public void testJoinedElementCollectionValuesInTupleList() {
		EntityManager em = getOrCreateEntityManager();
		em.getTransaction().begin();
		CriteriaQuery<Phone> criteria = builder.createQuery( Phone.class );
		Root<Phone> from = criteria.from( Phone.class );
		criteria.where(
				from.join( "types" )
						.in( Collections.singletonList( Phone.Type.WORK ) )
		);
		em.createQuery( criteria ).getResultList();
		em.getTransaction().commit();
		em.close();
	}
}