Question

我最近正在尝试学习OrientDb，现在我对OrientDb控制台本身有些熟悉，我正在使用Blueprints编写一个简单的java程序来创建图形。我试图在它们之间创建一些顶点和边，但是虽然我的顶点是成功创建的，但是除非我调用创建方法两次，否则我无法看到我的边。如果我注释掉其中一个调用，则不会创建任何边。我尝试通过添加睡眠时间来检查任何计时问题，但似乎没有任何帮助。

我尝试使用控制台检查，我看到创建的顶点但不是边缘。我正在为东方运行1.7 rc-1。

以下是我尝试使用的示例代码：

public class OrientPrototype {
    static OrientGraph graph = new OrientGraph("remote:localhost/Tinker", "admin", "admin");

    public static void main( String[] args ) {

        removeAllExistingVerticesAndEdges();

        createSimpleGraph();

        displayAllVertices(getAllVertices("Person"), "name");

        displayAllEdges(getAllEdges("Friend"));
    }

    private static void removeAllExistingVerticesAndEdges() {
        for (Vertex v : graph.getVertices())
            v.remove();

        for (Edge e : graph.getEdges())
            e.remove();
    }

    private static void createSimpleGraph() throws InterruptedException {

        createPersons();

        createFriendships();
        //createFriendships();
    }

    private static void createPersons() {
        String [] persons = {"John", "Jack", "Ryan"};

        if (graph.getVertexType("Person") == null)
            graph.createVertexType("Person");

        for (int i = 0; i < persons.length; i++) {
            try {
                Vertex v = graph.addVertex("class:Person");
                v.setProperty("name", persons[i]);
                graph.commit();
            }
            catch (Exception e) {
                graph.rollback();
                System.out.println("Error while creating the persons. Had to roll back");
            }
        }       
        System.out.println("Done creating vertices...");
    }

    private static void createFriendships() {
        if (graph.getEdgeType("Friend") == null) {
            graph.createEdgeType("Friend");
            graph.commit();
        }

        Map<String, Vertex> vertices = new HashMap<String, Vertex>();
        for (Vertex v : graph.getVertices())
            vertices.put(v.getProperty("name").toString(), v);

        try {
            graph.addEdge("class:Friend", vertices.get("John"), vertices.get("Jack"), "is friend");
            graph.addEdge("class:Friend", vertices.get("Jack"), vertices.get("Ryan"), "is friend");
            graph.addEdge("class:Friend", vertices.get("Ryan"), vertices.get("John"), "is friend");


            graph.commit();
            System.out.println("Done creating edges...");

        }
        catch (Exception e) {
            graph.rollback();
            System.out.println("Error while creating the edges between persons. Had to roll back");
        }
    }

    private static Iterable<Vertex> getAllVertices(String classname) {
        return graph.getVerticesOfClass(classname);
    }

    private static void displayAllVertices(Iterable<Vertex> it, String propertyName) {
        System.out.println("The vertices in the graph are:");
        for (Vertex v: it)
            System.out.println(v + " " + v.getProperty("name"));
    }

    private static Iterable<Edge> getAllEdges(String classname) {
        return graph.getEdgesOfClass(classname);
    }

    private static void displayAllEdges(Iterable<Edge> it) {
        System.out.println("The edges in the graph are:");
        for (Edge e: it)
            System.out.println(e);
    }
}

我不相信我做错了什么，因为当我查看OrientDb的控制台时，当我单独调用createEdge方法时，我在类Friend的Schema选项卡中看不到任何边缘？然而，这些确实在第二次通话后出现。此外，当我在Person类上运行从Person查询中选择时，我还会看到Person类的传入和传出链接。仅当我至少调用一次createEdge方法时，才会显示这些传入和传出链接。

非常感谢任何帮助。如果它有任何帮助，还附加我的maven pom文件中的依赖项：

<dependencies>
    <dependency>
        <groupId>com.tinkerpop.blueprints</groupId>
        <artifactId>blueprints-orient-graph</artifactId>
        <version>2.5.0-SNAPSHOT</version>
    </dependency>
    <dependency>
        <groupId>com.tinkerpop.gremlin</groupId>
        <artifactId>gremlin-java</artifactId>
        <version>2.5.0-SNAPSHOT</version>
    </dependency>
    <dependency>
        <groupId>com.orientechnologies</groupId>
        <artifactId>orient-commons</artifactId>
        <version>1.7-rc1</version>
    </dependency>
    <dependency>
        <groupId>com.orientechnologies</groupId>
        <artifactId>orientdb-core</artifactId>
        <version>1.7-rc1</version>
    </dependency>
    <dependency>
        <groupId>com.orientechnologies</groupId>
        <artifactId>orientdb-client</artifactId>
        <version>1.7-rc1</version>
    </dependency>
    <dependency>
        <groupId>com.orientechnologies</groupId>
        <artifactId>orientdb-object</artifactId>
        <version>1.7-rc1</version>
    </dependency>
    <dependency>
        <groupId>com.orientechnologies</groupId>
        <artifactId>orientdb-enterprise</artifactId>
        <version>1.7-rc1</version>
    </dependency>
</dependencies>

Answer 1

在这里收集松散的结尾......在gremlin-users邮件列表中回答：

https://groups.google.com/forum/#!topic/gremlin-users/xUNeuJkPyUo

基本摘要给出了Luca的回复......首先关闭轻量级边缘：

alter database custom useLightweightEdges=false

然后确保使用较新的OrientDB依赖项：

<dependency>
    <groupId>com.orientechnologies</groupId>
    <artifactId>orientdb-graphdb</artifactId>
    <version>1.7-rc1</version>
</dependency>

使用Blueprints / Tinkerpop在OrientDb中创建边缘的问题

1 个答案: