我正在使用以下环境：
我需要代表路线计划;在我的场景中，我有一些关系，其方向是结果，其他一些方向为INCOMING，另一些方向为方向。为了更清楚，让我假设我有节点A，B，C和D. 让我们假设以下情景
A - ＆以及c
A＆LT; - B
℃下; - ＆GT; d
我很想在neo4j中代表这种情况;为了做到这一点，我写了这两个类： 我的Node类：
@NodeEntity
public class GraphNode {
//Id del nodo in neo4j
@GraphId
private Long nodeId;
@Indexed(indexName="DB_ID",unique=true,numeric=false)
private String giunzioneDbId;
@Indexed(indexName="COORDINATA_X",unique=false,numeric=true)
private double x;
@Indexed(indexName="COORDINATA_Y",unique=false,numeric=true)
private double y;
@Indexed(indexName="COORDINATA_Z",unique=false,numeric=true)
private double z;
@Indexed(indexName="COORDINATA_M",unique=false,numeric=true)
private double m;
@RelatedToVia(direction=Direction.INCOMING,elementClass=NodesRelationship.class)
private Set<NodesRelationship> versoCareggiataDiscorde = new HashSet<NodesRelationship>();
@RelatedToVia(direction=Direction.OUTGOING,elementClass=NodesRelationship.class)
private Set<NodesRelationship> versoCareggiataConcorde = new HashSet<NodesRelationship>();
@RelatedToVia(direction=Direction.BOTH, elementClass=NodesRelationship.class)
private Set<NodesRelationship> versoCareggiataDoppio = new HashSet<NodesRelationship>();
public Long getNodeId() {
return nodeId;
}
public void setNodeId(Long nodeId) {
this.nodeId = nodeId;
}
public String getGiunzioneDbId() {
return giunzioneDbId;
}
public void setGiunzioneDbId(String giunzioneDbId) {
this.giunzioneDbId = giunzioneDbId;
}
public double getX() {
return x;
}
public void setX(double x) {
this.x = x;
}
public double getY() {
return y;
}
public void setY(double y) {
this.y = y;
}
public double getZ() {
return z;
}
public void setZ(double z) {
this.z = z;
}
public double getM() {
return m;
}
public void setM(double m) {
this.m = m;
}
public Set<NodesRelationship> getVersoCareggiataDiscorde() {
return versoCareggiataDiscorde;
}
public void setVersoCareggiataDiscorde(Set<NodesRelationship> versoCareggiataDiscorde) {
this.versoCareggiataDiscorde = versoCareggiataDiscorde;
}
public Set<NodesRelationship> getVersoCareggiataConcorde() {
return versoCareggiataConcorde;
}
public void setVersoCareggiataConcorde(Set<NodesRelationship> versoCareggiataConcorde) {
this.versoCareggiataConcorde = versoCareggiataConcorde;
}
public Set<NodesRelationship> getVersoCareggiataDoppio() {
return versoCareggiataDoppio;
}
public void setVersoCareggiataDoppio(Set<NodesRelationship> versoCareggiataDoppio) {
this.versoCareggiataDoppio = versoCareggiataDoppio;
}
public void addDiscordantRoadElementGraphRelation(GraphNode endNode, float lunghezzaArco, long elementoStrdaleDbId ){
NodesRelationship relation = new NodesRelationship(this, endNode, lunghezzaArco, elementoStrdaleDbId);
if( !versoCareggiataDiscorde.contains(relation) ){
versoCareggiataDiscorde.add(relation);
}
}
public void addConcordantRoadElementGraphRelation(GraphNode endNode, float lunghezzaArco, long elementoStrdaleDbId ){
NodesRelationship relation = new NodesRelationship(this, endNode, lunghezzaArco, elementoStrdaleDbId);
if( !versoCareggiataConcorde.contains(relation) ){
versoCareggiataConcorde.add(relation);
}
}
public void addTwoWayRoadElementGraphRelation(GraphNode endNode, float lunghezzaArco, long elementoStrdaleDbId ){
NodesRelationship relation = new NodesRelationship(this, endNode, lunghezzaArco, elementoStrdaleDbId);
if( !versoCareggiataDoppio.contains(relation) ){
versoCareggiataDoppio.add(relation);
}
}
}
我的关系班：
@RelationshipEntity(type="ROAD_ELEMENT")
public class GraphNodesRelationship {
@GraphId
private Long relId;
//Id del record elemento stradale del DB
@Indexed(indexName="ELEMENTO_STRADALE_DB_ID", numeric=false, unique=true)
private String elementoStradaleDbId;
@StartNode
private GraphNode nodoIniziale;
@EndNode
private GraphNode nodoFinale;
//Peso dell'arco (lunghezza dell'elemento stradale)
private float lunghezzaArco;
public GraphNodesRelationship(GraphNode nodoIniziale, GraphNode nodoFinale, float lunghezzaArco, long elementoStradaleDbId){
setNodoIniziale(nodoIniziale);
setNodoFinale(nodoFinale);
setLunghezzaArco(lunghezzaArco);
setElementoStradaleDbId("elementoStradaleDbId_"+elementoStradaleDbId);
}
public GraphNodesRelationship(){
}
public GraphNode getNodoIniziale() {
return nodoIniziale;
}
public void setNodoIniziale(GraphNode nodoIniziale) {
Assert.notNull(nodoIniziale, "Impossibile creare la relazione; passato un nodoIniziale nullo");
this.nodoIniziale = nodoIniziale;
}
public GraphNode getNodoFinale() {
return nodoFinale;
}
public void setNodoFinale(GraphNode nodoFinale) {
Assert.notNull(nodoFinale, "Impossibile creare la relazione; passato un nodoFinale nullo");
this.nodoFinale = nodoFinale;
}
public float getLunghezzaArco() {
return lunghezzaArco;
}
public void setLunghezzaArco(float lunghezzaArco) {
this.lunghezzaArco = lunghezzaArco;
}
public String getElementoStradaleDbId() {
return elementoStradaleDbId;
}
public void setElementoStradaleDbId(String elementoStradaleDbId) {
this.elementoStradaleDbId = elementoStradaleDbId;
}
}
如果我在尝试创建图表时以这种方式全部离开，并尝试保存关系，我会遇到这种错误：
org.springframework.dao.DataRetrievalFailureException: 0; nested exception is org.neo4j.graphdb.NotFoundException: 0
at org.springframework.data.neo4j.support.Neo4jExceptionTranslator.translateExceptionIfPossible(Neo4jExceptionTranslator.java:63)
at org.springframework.dao.support.ChainedPersistenceExceptionTranslator.translateExceptionIfPossible(ChainedPersistenceExceptionTranslator.java:58)
at org.springframework.dao.support.DataAccessUtils.translateIfNecessary(DataAccessUtils.java:213)
at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:163)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
at com.sun.proxy.$Proxy25.save(Unknown Source)
at it.eng.tz.pinf.graph.creator.service.impl.PinfDbSisGraphCreatorSvcImpl.creatGraph(PinfDbSisGraphCreatorSvcImpl.java:122)
at it.eng.pinf.graph.extractor.test.PinfGraphTest.graphCreationTest(PinfGraphTest.java:72)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:74)
at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:83)
at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:72)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:231)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:88)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:71)
at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:174)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
Caused by: org.neo4j.graphdb.NotFoundException: 0
at org.neo4j.rest.graphdb.ExecutingRestAPI.getRelationshipById(ExecutingRestAPI.java:100)
at org.neo4j.rest.graphdb.RestAPIFacade.getRelationshipById(RestAPIFacade.java:62)
at org.neo4j.rest.graphdb.RestGraphDatabase.getRelationshipById(RestGraphDatabase.java:87)
at org.springframework.data.neo4j.support.mapping.EntityStateHandler.getPersistentState(EntityStateHandler.java:110)
at org.springframework.data.neo4j.support.mapping.EntityStateHandler.getPersistentState(EntityStateHandler.java:93)
at org.springframework.data.neo4j.support.mapping.Neo4jEntityPersister.getPersistentState(Neo4jEntityPersister.java:221)
at org.springframework.data.neo4j.support.mapping.Neo4jEntityPersister.persist(Neo4jEntityPersister.java:248)
at org.springframework.data.neo4j.support.mapping.Neo4jEntityPersister.persist(Neo4jEntityPersister.java:231)
at org.springframework.data.neo4j.support.Neo4jTemplate.save(Neo4jTemplate.java:294)
at org.springframework.data.neo4j.fieldaccess.RelatedToViaCollectionFieldAccessorFactory$RelatedToViaCollectionFieldAccessor.persistEntities(RelatedToViaCollectionFieldAccessorFactory.java:99)
at org.springframework.data.neo4j.fieldaccess.RelatedToViaCollectionFieldAccessorFactory$RelatedToViaCollectionFieldAccessor.setValue(RelatedToViaCollectionFieldAccessorFactory.java:93)
at org.springframework.data.neo4j.fieldaccess.DefaultEntityState.setValue(DefaultEntityState.java:113)
at org.springframework.data.neo4j.support.mapping.SourceStateTransmitter.setEntityStateValue(SourceStateTransmitter.java:70)
at org.springframework.data.neo4j.support.mapping.SourceStateTransmitter.access$100(SourceStateTransmitter.java:40)
at org.springframework.data.neo4j.support.mapping.SourceStateTransmitter$4.doWithAssociation(SourceStateTransmitter.java:113)
at org.springframework.data.mapping.model.BasicPersistentEntity.doWithAssociations(BasicPersistentEntity.java:269)
at org.springframework.data.neo4j.support.mapping.SourceStateTransmitter.copyPropertiesTo(SourceStateTransmitter.java:109)
at org.springframework.data.neo4j.support.mapping.Neo4jEntityConverterImpl.write(Neo4jEntityConverterImpl.java:167)
at org.springframework.data.neo4j.support.mapping.Neo4jEntityPersister$CachedConverter.write(Neo4jEntityPersister.java:179)
at org.springframework.data.neo4j.support.mapping.Neo4jEntityPersister.persist(Neo4jEntityPersister.java:243)
at org.springframework.data.neo4j.support.mapping.Neo4jEntityPersister.persist(Neo4jEntityPersister.java:231)
at org.springframework.data.neo4j.support.Neo4jTemplate.save(Neo4jTemplate.java:294)
at org.springframework.data.neo4j.support.Neo4jTemplate.save(Neo4jTemplate.java:288)
at org.springframework.data.neo4j.repository.AbstractGraphRepository.save(AbstractGraphRepository.java:113)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.executeMethodOn(RepositoryFactorySupport.java:358)
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.java:343)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:96)
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:260)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:94)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:155)
... 33 more
如果在我的Node类中我为关系设置了一个类型，那么一切都很好......这是否意味着我不能添加相同类型但不同方向的关系到节点？我应该为关系指定不同的类型吗？
我希望我很清楚
欢迎任何建议 谢谢
Angelo