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Hibernate example source code file (ClobLocatorTest.java)

This example Hibernate source code file (ClobLocatorTest.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

clob_size, clob_size, cloblocatortest, jdbc, lob, lobholder, lobholder, requiresdialectfeature, session, sql, string, string, stringbuffer, test, test, throwable

The Hibernate ClobLocatorTest.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.test.lob;
import java.sql.Clob;

import org.hibernate.LockMode;
import org.hibernate.Session;
import org.hibernate.type.descriptor.java.DataHelper;

import org.junit.Test;

import org.hibernate.testing.DialectChecks;
import org.hibernate.testing.RequiresDialectFeature;
import org.hibernate.testing.junit4.BaseCoreFunctionalTestCase;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;

/**
 * Tests lazy materialization of data mapped by
 * {@link org.hibernate.type.ClobType} as well as bounded and unbounded
 * materialization and mutation.
 *
 * @author Steve Ebersole
 */
@RequiresDialectFeature(
		value = DialectChecks.SupportsExpectedLobUsagePattern.class,
		comment = "database/driver does not support expected LOB usage pattern"
)
public class ClobLocatorTest extends BaseCoreFunctionalTestCase {
	private static final int CLOB_SIZE = 10000;

	public String[] getMappings() {
		return new String[] { "lob/LobMappings.hbm.xml" };
	}

	@Test
	public void testBoundedClobLocatorAccess() throws Throwable {
		String original = buildString( CLOB_SIZE, 'x' );
		String changed = buildString( CLOB_SIZE, 'y' );
		String empty = "";

		Session s = openSession();
		s.beginTransaction();
		LobHolder entity = new LobHolder();
		entity.setClobLocator( s.getLobHelper().createClob( original ) );
		s.save( entity );
		s.getTransaction().commit();
		s.close();

		s = openSession();
		s.beginTransaction();
		entity = ( LobHolder ) s.get( LobHolder.class, entity.getId() );
		assertEquals( CLOB_SIZE, entity.getClobLocator().length() );
		assertEquals( original, extractData( entity.getClobLocator() ) );
		s.getTransaction().commit();
		s.close();

		// test mutation via setting the new clob data...
		if ( getDialect().supportsLobValueChangePropogation() ) {
			s = openSession();
			s.beginTransaction();
			entity = ( LobHolder ) s.get( LobHolder.class, entity.getId(), LockMode.UPGRADE );
			entity.getClobLocator().truncate( 1 );
			entity.getClobLocator().setString( 1, changed );
			s.getTransaction().commit();
			s.close();

			s = openSession();
			s.beginTransaction();
			entity = ( LobHolder ) s.get( LobHolder.class, entity.getId(), LockMode.UPGRADE );
			assertNotNull( entity.getClobLocator() );
			assertEquals( CLOB_SIZE, entity.getClobLocator().length() );
			assertEquals( changed, extractData( entity.getClobLocator() ) );
			entity.getClobLocator().truncate( 1 );
			entity.getClobLocator().setString( 1, original );
			s.getTransaction().commit();
			s.close();
		}

		// test mutation via supplying a new clob locator instance...
		s = openSession();
		s.beginTransaction();
		entity = ( LobHolder ) s.get( LobHolder.class, entity.getId(), LockMode.UPGRADE );
		assertNotNull( entity.getClobLocator() );
		assertEquals( CLOB_SIZE, entity.getClobLocator().length() );
		assertEquals( original, extractData( entity.getClobLocator() ) );
		entity.setClobLocator( s.getLobHelper().createClob( changed ) );
		s.getTransaction().commit();
		s.close();

		// test empty clob
		s = openSession();
		s.beginTransaction();
		entity = ( LobHolder ) s.get( LobHolder.class, entity.getId() );
		assertEquals( CLOB_SIZE, entity.getClobLocator().length() );
		assertEquals( changed, extractData( entity.getClobLocator() ) );
		entity.setClobLocator( s.getLobHelper().createClob( empty ) );
		s.getTransaction().commit();
		s.close();

		s = openSession();
		s.beginTransaction();
		entity = ( LobHolder ) s.get( LobHolder.class, entity.getId() );
		if ( entity.getClobLocator() != null) {
			assertEquals( empty.length(), entity.getClobLocator().length() );
			assertEquals( empty, extractData( entity.getClobLocator() ) );
		}
		s.delete( entity );
		s.getTransaction().commit();
		s.close();

	}

	@Test
	@RequiresDialectFeature(
			value = DialectChecks.SupportsUnboundedLobLocatorMaterializationCheck.class,
			comment = "database/driver does not support materializing a LOB locator outside the owning transaction"
	)
	public void testUnboundedClobLocatorAccess() throws Throwable {
		// Note: unbounded mutation of the underlying lob data is completely
		// unsupported; most databases would not allow such a construct anyway.
		// Thus here we are only testing materialization...

		String original = buildString( CLOB_SIZE, 'x' );

		Session s = openSession();
		s.beginTransaction();
		LobHolder entity = new LobHolder();
		entity.setClobLocator( s.getLobHelper().createClob( original ) );
		s.save( entity );
		s.getTransaction().commit();
		s.close();

		// load the entity with the clob locator, and close the session/transaction;
		// at that point it is unbounded...
		s = openSession();
		s.beginTransaction();
		entity = ( LobHolder ) s.get( LobHolder.class, entity.getId() );
		s.getTransaction().commit();
		s.close();

		assertEquals( CLOB_SIZE, entity.getClobLocator().length() );
		assertEquals( original, extractData( entity.getClobLocator() ) );

		s = openSession();
		s.beginTransaction();
		s.delete( entity );
		s.getTransaction().commit();
		s.close();
	}

	public static String extractData(Clob clob) throws Exception {
		return DataHelper.extractString( clob.getCharacterStream() );
	}

	public static String buildString(int size, char baseChar) {
		StringBuffer buff = new StringBuffer();
		for( int i = 0; i < size; i++ ) {
			buff.append( baseChar );
		}
		return buff.toString();
	}
}

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