SDN 4.0

Question

我尝试在RelathionEntity上保存属性

正如我在这里读到的那样

How to CRUD @RelationshipEntity in SDN 4.0

这可以保存一个起始/结束节点，但我注意到这是极端缓慢而不是用deth 0保存节点（保存深度为0的节点大约需要2ms，保存深度为1的节点需要1000毫秒）。我尝试保存的节点只有4个关系

我还在注释为@RelationshipEntity的对象上尝试了session.save（...）（org.neo4j.ogm.session.Session），但它没有做任何事情

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;
 }

按照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");

添加节点花费不到100毫秒，第一次更新（setPropertyAB（＆＃34; newProperty1＆＃34;）之后的保存）大约需要1秒，下一次更新大约需要4秒，最后一次更新大约需要7秒

Answer 1

根据Michael Hunger的建议，这些性能问题已在版本中修复：

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

在1.1.3发布之前，您需要向快照存储库添加依赖项：

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

我们使用我们的解决方案进行了测试。