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我尝试在 RelathionEntity 上保存属性

正如我在这里读到的

如何在 SDN 4.0 中对 @RelationshipEntity 进行 CRUD

这可以保存一个开始/结束节点，但我注意到这非常慢，而不是保存一个深度为 0 的节点（保存深度为 0 的节点大约需要 2 毫秒，保存深度为 1 的节点大约需要 1000 毫秒）。我要保存的节点只有 4 个关系

我也尝试过 session.save(...) (org.neo4j.ogm.session.Session) 在注释为 @RelationshipEntity 的对象上，但它什么也没做

我使用 spring-data-neo4j 4.0.0.RELEASE 和 Neo4j 2.2.5

遵循实体和关系的代码：

@NodeEntity
public class EntityA{
   @GraphId
   private Long             nodeId;
   private String               propertyA;
   @Relationship(type = "RelationshipAB", direction = Relationship.OUTGOING)
   private Set<RelationshipAB>  entitiesB   = new HashSet<RelationshipAB>();
}

@NodeEntity
public class EntityB{
   @GraphId
   private Long nodeId;
   private String   propertyB;
}

@RelationshipEntity(type = "RelationshipAB")
public class RelationshipAB{
   @GraphId
   private Long nodeId;
   @StartNode
   private EntityA  entityA;
   @EndNode
   private EntityB  entityB;
   @Property
   private String   propertyAB;
 }

遵循一个简单的测试用例来检查性能：

    EntityA entityA = new EntityA();
    entityA.setPropertyA("propertyA");
    entityARepository.save(entityA);

    for (int i = 0; i < 100; i++) {
        EntityB entityB = new EntityB();
        entityB.setPropertyB("propertyB-" + i);
        entityBRepository.save(entityB);

        RelationshipAB rel = new RelationshipAB();
        rel.setEntityA(entityA);
        rel.setEntityB(entityB);
        rel.setPropertyAB("propertyAB-" + i);

        entityA.getEntitiesB().add(rel);

        Date startDate = new Date();
        entityARepository.save(entityA, 1);
        Date endDate = new Date();
        System.out.println("Time for adding " + (i + 1) + " node: " + (endDate.getTime() - startDate.getTime()) + " ms");
    }

    Iterator<RelationshipAB> iter = entityA.getEntitiesB().iterator();
    for (int i = 0; i < 10; i++) {
        iter.next();
    }
    iter.next().setPropertyAB("newProperty1");
    Date startDate = new Date();
    entityARepository.save(entityA, 1);
    Date endData = new Date();
    System.out.println("Time for cahnge the first relationship property: " + (endData.getTime() - startDate.getTime()) + " ms");

    for (int i = 0; i < 20; i++) {
        iter.next();
    }
    iter.next().setPropertyAB("newProperty2");
    startDate = new Date();
    entityARepository.save(entityA, 1);
    endData = new Date();
    System.out.println("Time for cahnge the second relationship property: " + (endData.getTime() - startDate.getTime()) + " ms");

    for (int i = 0; i < 10; i++) {
        iter.next();
    }
    iter.next().setPropertyAB("newProperty3");
    startDate = new Date();
    entityARepository.save(entityA, 1);
    endData = new Date();
    System.out.println("Time for cahnge the third relationship property: " + (endData.getTime() - startDate.getTime()) + " ms");

添加节点不到100ms，第一次更新（setPropertyAB("newProperty1")之后的保存）约1s，下一次更新约4s，最后一次约7s

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1 回答 1

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正如 Michael Hunger 所建议的，此性能问题已在以下版本中得到修复：

<dependency>
    <groupId>org.neo4j</groupId>
    <artifactId>neo4j-ogm</artifactId>
    <version>1.1.3-SNAPSHOT</version>
</dependency>

在 1.1.3 发布之前，您需要将依赖项添加到快照存储库：

<repository>
    <id>neo4j-snapshots</id>
    <url>http://m2.neo4j.org/content/repositories/snapshots</url>
    <snapshots>
        <enabled>true</enabled>
    </snapshots>
</repository>

我们用我们的解决方案对其进行了测试。

于 2015-10-05T15:18:22.323 回答