HHH-14097 fix bug that redundant SQLs might be issued for 'FETCH' entity graph
This commit is contained in:
Nathan Xu
Sanne Grinovero
parent
629f847b7c
commit
5952c0abc3
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@ -188,8 +188,15 @@ In both cases, this resolves to exactly one database query to get all that infor
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[[fetching-strategies-dynamic-fetching-entity-graph]]
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=== Dynamic fetching via JPA entity graph
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JPA 2.1 introduced entity graphs so the application developer has more control over fetch plans.
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JPA 2.1 introduced ``entity graph`` so the application developer has more control over fetch plans. It has two modes to choose from:
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fetch graph:::
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In this case, all attributes specified in the entity graph will be treated as FetchType.EAGER, and all attributes not specified will *ALWAYS* be treated as FetchType.LAZY.
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load graph:::
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In this case, all attributes specified in the entity graph will be treated as FetchType.EAGER, but attributes not specified use their static mapping specification.
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Below is an `fetch graph` dynamic fetching example:
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[[fetching-strategies-dynamic-fetching-entity-graph-example]]
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.Fetch graph example
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====
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@ -206,62 +206,91 @@ public final class TwoPhaseLoad {
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String entityName = persister.getEntityName();
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String[] propertyNames = persister.getPropertyNames();
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final Type[] types = persister.getPropertyTypes();
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final GraphImplementor<?> fetchGraphContext = session.getFetchGraphLoadContext();
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for ( int i = 0; i < hydratedState.length; i++ ) {
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final Object value = hydratedState[i];
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if ( debugEnabled ) {
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LOG.debugf(
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"Processing attribute `%s` : value = %s",
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propertyNames[i],
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value == LazyPropertyInitializer.UNFETCHED_PROPERTY ? "<un-fetched>" : value == PropertyAccessStrategyBackRefImpl.UNKNOWN ? "<unknown>" : value
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);
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}
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if ( value == LazyPropertyInitializer.UNFETCHED_PROPERTY ) {
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GraphImplementor fetchGraphContext = session.getFetchGraphLoadContext();
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if ( fetchGraphContext != null && !fetchGraphContext.appliesTo( entity.getClass() ) ) {
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LOG.warnf( "Entity graph specified is not applicable to the entity [%s]. Ignored.", entity);
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fetchGraphContext = null;
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session.setFetchGraphLoadContext( null );
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}
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try {
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for ( int i = 0; i < hydratedState.length; i++ ) {
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final Object value = hydratedState[i];
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if ( debugEnabled ) {
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LOG.debugf( "Resolving <un-fetched> attribute : `%s`", propertyNames[i] );
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LOG.debugf(
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"Processing attribute `%s` : value = %s",
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propertyNames[i],
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value == LazyPropertyInitializer.UNFETCHED_PROPERTY ?
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"<un-fetched>" :
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value == PropertyAccessStrategyBackRefImpl.UNKNOWN ? "<unknown>" : value
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);
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}
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// IMPLEMENTATION NOTE: This is a lazy property on a bytecode-enhanced entity.
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// hydratedState[i] needs to remain LazyPropertyInitializer.UNFETCHED_PROPERTY so that
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// setPropertyValues() below (ultimately AbstractEntityTuplizer#setPropertyValues) works properly
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// No resolution is necessary, unless the lazy property is a collection.
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if ( types[i].isCollectionType() ) {
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// IMPLEMENTATION NOTE: this is a lazy collection property on a bytecode-enhanced entity.
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// HHH-10989: We need to resolve the collection so that a CollectionReference is added to StatefulPersistentContext.
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// As mentioned above, hydratedState[i] needs to remain LazyPropertyInitializer.UNFETCHED_PROPERTY
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// so do not assign the resolved, uninitialized PersistentCollection back to hydratedState[i].
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Boolean overridingEager = getOverridingEager( session, entityName, propertyNames[i], types[i], debugEnabled );
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types[i].resolve( value, session, entity, overridingEager );
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if ( value == LazyPropertyInitializer.UNFETCHED_PROPERTY ) {
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if ( debugEnabled ) {
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LOG.debugf( "Resolving <un-fetched> attribute : `%s`", propertyNames[i] );
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}
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// IMPLEMENTATION NOTE: This is a lazy property on a bytecode-enhanced entity.
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// hydratedState[i] needs to remain LazyPropertyInitializer.UNFETCHED_PROPERTY so that
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// setPropertyValues() below (ultimately AbstractEntityTuplizer#setPropertyValues) works properly
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// No resolution is necessary, unless the lazy property is a collection.
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if ( types[i].isCollectionType() ) {
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// IMPLEMENTATION NOTE: this is a lazy collection property on a bytecode-enhanced entity.
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// HHH-10989: We need to resolve the collection so that a CollectionReference is added to StatefulPersistentContext.
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// As mentioned above, hydratedState[i] needs to remain LazyPropertyInitializer.UNFETCHED_PROPERTY
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// so do not assign the resolved, uninitialized PersistentCollection back to hydratedState[i].
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Boolean overridingEager = getOverridingEager(
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session,
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entityName,
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propertyNames[i],
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types[i],
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debugEnabled
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);
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types[i].resolve( value, session, entity, overridingEager );
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}
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}
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}
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else if ( value != PropertyAccessStrategyBackRefImpl.UNKNOWN ) {
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if ( debugEnabled ) {
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final boolean isLazyEnhanced = persister.getBytecodeEnhancementMetadata()
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.getLazyAttributesMetadata()
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.getLazyAttributeNames()
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.contains( propertyNames[i] );
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LOG.debugf( "Attribute (`%s`) - enhanced for lazy-loading? - %s", propertyNames[i], isLazyEnhanced );
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else if ( value != PropertyAccessStrategyBackRefImpl.UNKNOWN ) {
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if ( debugEnabled ) {
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final boolean isLazyEnhanced = persister.getBytecodeEnhancementMetadata()
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.getLazyAttributesMetadata()
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.getLazyAttributeNames()
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.contains( propertyNames[i] );
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LOG.debugf(
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"Attribute (`%s`) - enhanced for lazy-loading? - %s",
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propertyNames[i],
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isLazyEnhanced
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);
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}
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// we know value != LazyPropertyInitializer.UNFETCHED_PROPERTY
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Boolean overridingEager = getOverridingEager(
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session,
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entityName,
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propertyNames[i],
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types[i],
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debugEnabled
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);
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hydratedState[i] = types[i].isEntityType()
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? entityResolver.resolve( (EntityType) types[i], value, session, entity, overridingEager )
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: types[i].resolve( value, session, entity, overridingEager );
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}
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else {
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if ( debugEnabled ) {
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LOG.debugf( "Skipping <unknown> attribute : `%s`", propertyNames[i] );
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}
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}
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// we know value != LazyPropertyInitializer.UNFETCHED_PROPERTY
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Boolean overridingEager = getOverridingEager( session, entityName, propertyNames[i], types[i], debugEnabled );
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hydratedState[i] = types[i].isEntityType()
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? entityResolver.resolve( (EntityType) types[i], value, session, entity, overridingEager )
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: types[i].resolve( value, session, entity, overridingEager );
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}
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else {
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if ( debugEnabled ) {
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LOG.debugf( "Skipping <unknown> attribute : `%s`", propertyNames[i] );
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}
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}
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if ( session.getFetchGraphLoadContext() != fetchGraphContext ) {
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session.setFetchGraphLoadContext( fetchGraphContext );
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}
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}
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finally {
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// HHH-14097
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// Fetch entity graph should be applied only once on top level (for root hydrated object)
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// e.g., see org.hibernate.loader.Loader for details
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session.setFetchGraphLoadContext( null );
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}
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}
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public static void initializeEntityFromEntityEntryLoadedState(
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@ -0,0 +1,516 @@
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/*
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* Hibernate, Relational Persistence for Idiomatic Java
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*
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* License: GNU Lesser General Public License (LGPL), version 2.1 or later.
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* See the lgpl.txt file in the root directory or <http://www.gnu.org/licenses/lgpl-2.1.html>.
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*/
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package org.hibernate.jpa.test.graphs;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.Map;
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import javax.persistence.CascadeType;
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import javax.persistence.Entity;
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import javax.persistence.EntityGraph;
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import javax.persistence.FetchType;
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import javax.persistence.Id;
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import javax.persistence.JoinColumn;
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import javax.persistence.ManyToOne;
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import javax.persistence.OneToMany;
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import javax.persistence.Table;
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import javax.persistence.TypedQuery;
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import org.hibernate.Hibernate;
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import org.hibernate.SessionFactory;
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import org.hibernate.cfg.Environment;
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import org.hibernate.graph.GraphSemantic;
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import org.hibernate.jpa.test.BaseEntityManagerFunctionalTestCase;
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import org.hibernate.stat.Statistics;
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import org.hibernate.testing.TestForIssue;
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import org.junit.Before;
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import org.junit.Test;
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import static org.hibernate.testing.transaction.TransactionUtil.doInJPA;
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import static org.junit.Assert.assertEquals;
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import static org.junit.Assert.assertFalse;
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import static org.junit.Assert.assertTrue;
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/**
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* @author Andrea Boriero
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* @author Nathan Xu
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*/
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@TestForIssue(jiraKey = "HHH-14097")
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public class LoadAndFetchGraphTest extends BaseEntityManagerFunctionalTestCase {
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@Override
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protected Class<?>[] getAnnotatedClasses() {
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return new Class[] {
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AEntity.class,
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BEntity.class,
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CEntity.class,
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DEntity.class,
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EEntity.class
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};
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}
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@Override
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protected void addConfigOptions(Map options) {
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options.put( Environment.GENERATE_STATISTICS, "true" );
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super.addConfigOptions( options );
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}
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@Before
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public void setUp() {
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doInJPA(
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this::entityManagerFactory, entityManager -> {
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AEntity a1 = new AEntity();
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a1.setId( 1 );
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a1.setLabel( "A1" );
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AEntity a2 = new AEntity();
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a2.setId( 2 );
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a2.setLabel( "A2" );
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entityManager.persist( a1 );
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entityManager.persist( a2 );
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BEntity b1 = new BEntity();
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b1.setId( 1 );
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b1.setLabel( "B1" );
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BEntity b2 = new BEntity();
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b2.setId( 2 );
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b2.setLabel( "B2" );
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entityManager.persist( b1 );
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entityManager.persist( b2 );
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EEntity e1 = new EEntity();
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e1.setId( 1 );
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e1.setLabel( "E1" );
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EEntity e2 = new EEntity();
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e2.setId( 2 );
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e2.setLabel( "E2" );
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EEntity e3 = new EEntity();
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e3.setId( 3 );
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e3.setLabel( "E3" );
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EEntity e4 = new EEntity();
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e4.setId( 4 );
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e4.setLabel( "E4" );
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entityManager.persist( e1 );
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entityManager.persist( e2 );
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entityManager.persist( e3 );
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entityManager.persist( e4 );
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DEntity d1 = new DEntity();
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d1.setId( 1 );
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d1.setLabel( "D1" );
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d1.setE( e1 );
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DEntity d2 = new DEntity();
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d2.setId( 2 );
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d2.setLabel( "D2" );
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d2.setE( e2 );
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CEntity c1 = new CEntity();
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c1.setId( 1 );
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c1.setLabel( "C1" );
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c1.setA( a1 );
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c1.setB( b1 );
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c1.addD( d1 );
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c1.addD( d2 );
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entityManager.persist( c1 );
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DEntity d3 = new DEntity();
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d3.setId( 3 );
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d3.setLabel( "D3" );
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d3.setE( e3 );
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DEntity d4 = new DEntity();
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d4.setId( 4 );
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d4.setLabel( "D4" );
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d4.setE( e4 );
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CEntity c2 = new CEntity();
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c2.setId( 2 );
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c2.setLabel( "C2" );
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c2.setA( a2 );
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c2.setB( b2 );
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c2.addD( d3 );
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c2.addD( d4 );
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entityManager.persist( c2 );
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CEntity c3 = new CEntity();
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c3.setId( 3 );
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c3.setLabel( "C3" );
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entityManager.persist( c3 );
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c1.setC( c2 );
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c2.setC( c3 );
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int id = 5;
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for ( int i = 0; i < 10; i++ ) {
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DEntity dn = new DEntity();
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dn.setId( id++ );
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dn.setLabel( "label" );
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dn.setE( e3 );
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entityManager.persist( dn );
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}
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} );
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}
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@Test
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public void testQueryById() {
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Statistics statistics = entityManagerFactory().unwrap( SessionFactory.class ).getStatistics();
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statistics.clear();
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doInJPA(
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this::entityManagerFactory, entityManager -> {
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TypedQuery<CEntity> query = entityManager.createQuery(
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"select c from CEntity as c where c.id = :cid ",
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CEntity.class
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);
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query.setParameter( "cid", 1 );
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CEntity cEntity = query.getSingleResult();
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assertFalse( Hibernate.isInitialized( cEntity.getA() ) );
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assertFalse( Hibernate.isInitialized( cEntity.getB() ) );
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assertFalse( Hibernate.isInitialized( cEntity.getC() ) );
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assertFalse( Hibernate.isInitialized( cEntity.getdList() ) );
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assertEquals( 1L, statistics.getPrepareStatementCount() );
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} );
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}
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@Test
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public void testQueryByIdWithLoadGraph() {
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Statistics statistics = entityManagerFactory().unwrap( SessionFactory.class ).getStatistics();
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statistics.clear();
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doInJPA(
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this::entityManagerFactory, entityManager -> {
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EntityGraph<CEntity> entityGraph = entityManager.createEntityGraph( CEntity.class );
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entityGraph.addAttributeNodes( "a", "b" );
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entityGraph.addSubgraph( "dList" ).addAttributeNodes( "e" );
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TypedQuery<CEntity> query = entityManager.createQuery(
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"select c from CEntity as c where c.id = :cid ",
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CEntity.class
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);
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query.setHint( GraphSemantic.LOAD.getJpaHintName(), entityGraph );
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query.setParameter( "cid", 1 );
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CEntity cEntity = query.getSingleResult();
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assertTrue( Hibernate.isInitialized( cEntity.getA() ) );
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assertTrue( Hibernate.isInitialized( cEntity.getB() ) );
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assertFalse( Hibernate.isInitialized( cEntity.getC() ) );
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assertTrue( Hibernate.isInitialized( cEntity.getdList() ) );
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cEntity.getdList().forEach( dEntity -> {
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assertTrue( Hibernate.isInitialized( dEntity.getE() ) );
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} );
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assertEquals( 1L, statistics.getPrepareStatementCount() );
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} );
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}
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@Test
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public void testQueryByIdWithFetchGraph() {
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Statistics statistics = entityManagerFactory().unwrap( SessionFactory.class ).getStatistics();
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statistics.clear();
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doInJPA(
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this::entityManagerFactory, entityManager -> {
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EntityGraph<CEntity> entityGraph = entityManager.createEntityGraph( CEntity.class );
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entityGraph.addAttributeNodes( "a", "b" );
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entityGraph.addSubgraph( "dList" ).addAttributeNodes( "e" );
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TypedQuery<CEntity> query = entityManager.createQuery(
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"select c from CEntity as c where c.id = :cid ",
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CEntity.class
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);
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query.setHint( GraphSemantic.FETCH.getJpaHintName(), entityGraph );
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query.setParameter( "cid", 1 );
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CEntity cEntity = query.getSingleResult();
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assertTrue( Hibernate.isInitialized( cEntity.getA() ) );
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assertTrue( Hibernate.isInitialized( cEntity.getB() ) );
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assertFalse( Hibernate.isInitialized( cEntity.getC() ) );
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assertTrue( Hibernate.isInitialized( cEntity.getdList() ) );
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cEntity.getdList().forEach( dEntity -> {
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assertTrue( Hibernate.isInitialized( dEntity.getE() ) );
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} );
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assertEquals( 1L, statistics.getPrepareStatementCount() );
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} );
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}
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@Test
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public void testQueryByIdWithFetchGraph2() {
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Statistics statistics = entityManagerFactory().unwrap( SessionFactory.class ).getStatistics();
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statistics.clear();
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doInJPA(
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this::entityManagerFactory, entityManager -> {
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EntityGraph<CEntity> entityGraph = entityManager.createEntityGraph( CEntity.class );
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entityGraph.addSubgraph( "c" ).addAttributeNodes( "a" );
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TypedQuery<CEntity> query = entityManager.createQuery(
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"select c from CEntity as c where c.id = :cid ",
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CEntity.class
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);
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query.setHint( GraphSemantic.FETCH.getJpaHintName(), entityGraph );
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query.setParameter( "cid", 1 );
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CEntity cEntity = query.getSingleResult();
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assertTrue( Hibernate.isInitialized( cEntity.getC() ) );
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assertTrue( Hibernate.isInitialized( cEntity.getC().getA() ) );
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assertFalse( Hibernate.isInitialized( cEntity.getC().getC() ) );
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assertEquals( 1L, statistics.getPrepareStatementCount() );
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} );
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}
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@Entity(name = "AEntity")
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@Table(name = "A")
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public static class AEntity {
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@Id
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private Integer id;
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private String label;
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@OneToMany(
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fetch = FetchType.LAZY,
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mappedBy = "a",
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cascade = CascadeType.ALL,
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orphanRemoval = true
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)
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private List<CEntity> cList = new ArrayList<>();
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public Integer getId() {
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return id;
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}
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|
||||
public void setId(Integer id) {
|
||||
this.id = id;
|
||||
}
|
||||
|
||||
public String getLabel() {
|
||||
return label;
|
||||
}
|
||||
|
||||
public void setLabel(String label) {
|
||||
this.label = label;
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
@Entity(name = "BEntity")
|
||||
@Table(name = "B")
|
||||
public static class BEntity {
|
||||
|
||||
@Id
|
||||
private Integer id;
|
||||
|
||||
private String label;
|
||||
|
||||
@OneToMany(
|
||||
fetch = FetchType.LAZY,
|
||||
mappedBy = "b",
|
||||
cascade = CascadeType.ALL,
|
||||
orphanRemoval = true
|
||||
)
|
||||
private List<CEntity> cList = new ArrayList<>();
|
||||
|
||||
public Integer getId() {
|
||||
return id;
|
||||
}
|
||||
|
||||
public void setId(Integer id) {
|
||||
this.id = id;
|
||||
}
|
||||
|
||||
public String getLabel() {
|
||||
return label;
|
||||
}
|
||||
|
||||
public void setLabel(String label) {
|
||||
this.label = label;
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
@Entity(name = "CEntity")
|
||||
@Table(name = "C")
|
||||
public static class CEntity {
|
||||
|
||||
@Id
|
||||
private Integer id;
|
||||
|
||||
private String label;
|
||||
|
||||
@ManyToOne(fetch = FetchType.LAZY)
|
||||
@JoinColumn(name = "A_ID")
|
||||
private AEntity a;
|
||||
|
||||
@ManyToOne(fetch = FetchType.LAZY)
|
||||
@JoinColumn(name = "B_ID")
|
||||
private BEntity b;
|
||||
|
||||
@ManyToOne(fetch = FetchType.LAZY)
|
||||
private CEntity c;
|
||||
|
||||
@OneToMany(
|
||||
fetch = FetchType.LAZY,
|
||||
mappedBy = "c",
|
||||
cascade = CascadeType.ALL,
|
||||
orphanRemoval = true
|
||||
)
|
||||
private List<DEntity> dList = new ArrayList<>();
|
||||
|
||||
public void addD(DEntity d) {
|
||||
dList.add( d );
|
||||
d.setC( this );
|
||||
}
|
||||
|
||||
public Integer getId() {
|
||||
return id;
|
||||
}
|
||||
|
||||
public void setId(Integer id) {
|
||||
this.id = id;
|
||||
}
|
||||
|
||||
public String getLabel() {
|
||||
return label;
|
||||
}
|
||||
|
||||
public void setLabel(String label) {
|
||||
this.label = label;
|
||||
}
|
||||
|
||||
public AEntity getA() {
|
||||
return a;
|
||||
}
|
||||
|
||||
public void setA(AEntity a) {
|
||||
this.a = a;
|
||||
}
|
||||
|
||||
public BEntity getB() {
|
||||
return b;
|
||||
}
|
||||
|
||||
public void setB(BEntity b) {
|
||||
this.b = b;
|
||||
}
|
||||
|
||||
public CEntity getC() {
|
||||
return c;
|
||||
}
|
||||
|
||||
public void setC(CEntity c) {
|
||||
this.c = c;
|
||||
}
|
||||
|
||||
public List<DEntity> getdList() {
|
||||
return dList;
|
||||
}
|
||||
|
||||
public void setdList(List<DEntity> dList) {
|
||||
this.dList = dList;
|
||||
}
|
||||
}
|
||||
|
||||
@Entity(name = "DEntity")
|
||||
@Table(name = "D")
|
||||
public static class DEntity {
|
||||
|
||||
@Id
|
||||
private Integer id;
|
||||
|
||||
private String label;
|
||||
|
||||
@ManyToOne(fetch = FetchType.LAZY)
|
||||
@JoinColumn(name = "C_ID")
|
||||
private CEntity c;
|
||||
|
||||
@ManyToOne(fetch = FetchType.LAZY)
|
||||
@JoinColumn(name = "E_ID")
|
||||
private EEntity e;
|
||||
|
||||
public Integer getId() {
|
||||
return id;
|
||||
}
|
||||
|
||||
public void setId(Integer id) {
|
||||
this.id = id;
|
||||
}
|
||||
|
||||
public String getLabel() {
|
||||
return label;
|
||||
}
|
||||
|
||||
public void setLabel(String label) {
|
||||
this.label = label;
|
||||
}
|
||||
|
||||
public CEntity getC() {
|
||||
return c;
|
||||
}
|
||||
|
||||
public void setC(CEntity c) {
|
||||
this.c = c;
|
||||
}
|
||||
|
||||
public EEntity getE() {
|
||||
return e;
|
||||
}
|
||||
|
||||
public void setE(EEntity e) {
|
||||
this.e = e;
|
||||
}
|
||||
}
|
||||
|
||||
@Entity(name = "EEntity")
|
||||
@Table(name = "E")
|
||||
public static class EEntity {
|
||||
|
||||
@Id
|
||||
private Integer id;
|
||||
|
||||
private String label;
|
||||
|
||||
@OneToMany(
|
||||
fetch = FetchType.LAZY,
|
||||
mappedBy = "e",
|
||||
cascade = CascadeType.ALL,
|
||||
orphanRemoval = true
|
||||
)
|
||||
private List<DEntity> dList = new ArrayList<>();
|
||||
|
||||
public Integer getId() {
|
||||
return id;
|
||||
}
|
||||
|
||||
public void setId(Integer id) {
|
||||
this.id = id;
|
||||
}
|
||||
|
||||
public String getLabel() {
|
||||
return label;
|
||||
}
|
||||
|
||||
public void setLabel(String label) {
|
||||
this.label = label;
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
}
|
||||
Loading…
Reference in New Issue