/*
* 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.batch;
import java.math.BigDecimal;
import org.hibernate.CacheMode;
import org.hibernate.ScrollMode;
import org.hibernate.ScrollableResults;
import org.hibernate.Session;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
import org.hibernate.cfg.Environment;
import org.hibernate.testing.junit4.BaseCoreFunctionalTestCase;
import org.junit.Test;
/**
* This is how to do batch processing in Hibernate. Remember to enable JDBC batch updates, or this test will take a
* VeryLongTime!
*
* @author Gavin King
*/
public class BatchTest extends BaseCoreFunctionalTestCase {
@Override
public String[] getMappings() {
return new String[] { "batch/DataPoint.hbm.xml" };
}
@Override
public void configure(Configuration cfg) {
cfg.setProperty( Environment.STATEMENT_BATCH_SIZE, "20" );
}
@Test
public void testBatchInsertUpdate() {
long start = System.currentTimeMillis();
final int N = 5000; //26 secs with batch flush, 26 without
//final int N = 100000; //53 secs with batch flush, OOME without
//final int N = 250000; //137 secs with batch flush, OOME without
int batchSize = sessionFactory().getSettings().getJdbcBatchSize();
doBatchInsertUpdate( N, batchSize );
System.out.println( System.currentTimeMillis() - start );
}
@Test
public void testBatchInsertUpdateSizeEqJdbcBatchSize() {
int batchSize = sessionFactory().getSettings().getJdbcBatchSize();
doBatchInsertUpdate( 50, batchSize );
}
@Test
public void testBatchInsertUpdateSizeLtJdbcBatchSize() {
int batchSize = sessionFactory().getSettings().getJdbcBatchSize();
doBatchInsertUpdate( 50, batchSize - 1 );
}
@Test
public void testBatchInsertUpdateSizeGtJdbcBatchSize() {
int batchSize = sessionFactory().getSettings().getJdbcBatchSize();
doBatchInsertUpdate( 50, batchSize + 1 );
}
public void doBatchInsertUpdate(int nEntities, int nBeforeFlush) {
Session s = openSession();
s.setCacheMode( CacheMode.IGNORE );
Transaction t = s.beginTransaction();
for ( int i = 0; i < nEntities; i++ ) {
DataPoint dp = new DataPoint();
dp.setX( new BigDecimal( i * 0.1d ).setScale( 19, BigDecimal.ROUND_DOWN ) );
dp.setY( new BigDecimal( Math.cos( dp.getX().doubleValue() ) ).setScale( 19, BigDecimal.ROUND_DOWN ) );
s.save( dp );
if ( i + 1 % nBeforeFlush == 0 ) {
s.flush();
s.clear();
}
}
t.commit();
s.close();
s = openSession();
s.setCacheMode( CacheMode.IGNORE );
t = s.beginTransaction();
int i = 0;
ScrollableResults sr = s.createQuery( "from DataPoint dp order by dp.x asc" )
.scroll( ScrollMode.FORWARD_ONLY );
while ( sr.next() ) {
DataPoint dp = ( DataPoint ) sr.get( 0 );
dp.setDescription( "done!" );
if ( ++i % nBeforeFlush == 0 ) {
s.flush();
s.clear();
}
}
t.commit();
s.close();
s = openSession();
s.setCacheMode( CacheMode.IGNORE );
t = s.beginTransaction();
i = 0;
sr = s.createQuery( "from DataPoint dp order by dp.x asc" )
.scroll( ScrollMode.FORWARD_ONLY );
while ( sr.next() ) {
DataPoint dp = ( DataPoint ) sr.get( 0 );
s.delete( dp );
if ( ++i % nBeforeFlush == 0 ) {
s.flush();
s.clear();
}
}
t.commit();
s.close();
}
}