/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* License: GNU Lesser General Public License (LGPL), version 2.1 or later.
* See the lgpl.txt file in the root directory or <http://www.gnu.org/licenses/lgpl-2.1.html>.
*/
package org.hibernate.test.lob;
import java.sql.Clob;
import org.hibernate.LockOptions;
import org.hibernate.Session;
import org.hibernate.dialect.SybaseASE157Dialect;
import org.hibernate.dialect.TeradataDialect;
import org.hibernate.type.descriptor.java.DataHelper;
import org.hibernate.testing.DialectChecks;
import org.hibernate.testing.RequiresDialectFeature;
import org.hibernate.testing.SkipForDialect;
import org.hibernate.testing.junit4.BaseCoreFunctionalTestCase;
import org.junit.Test;
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
@SkipForDialect(
value = TeradataDialect.class,
jiraKey = "HHH-6637",
comment = "Teradata requires locator to be used in same session where it was created/retrieved"
)
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 = 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.byId( LobHolder.class ).with( LockOptions.UPGRADE ).load( entity.getId() );
entity.getClobLocator().truncate( 1 );
entity.getClobLocator().setString( 1, changed );
s.getTransaction().commit();
s.close();
s = openSession();
s.beginTransaction();
entity = ( LobHolder ) s.byId( LobHolder.class ).with( LockOptions.UPGRADE ).load( entity.getId() );
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.byId( LobHolder.class ).with( LockOptions.UPGRADE ).load( entity.getId() );
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
if ( !(getDialect() instanceof SybaseASE157Dialect) ) { // Skip for Sybase. HHH-6425
s = openSession();
s.beginTransaction();
entity = 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 = 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 = 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) {
StringBuilder buff = new StringBuilder();
for( int i = 0; i < size; i++ ) {
buff.append( baseChar );
}
return buff.toString();
}
}