gremlin

问题 TitanDB 1.0.0 (on top of DynamoDB) Gremlin 3 I've got a set of vertices with a label a . I have a property of type long on those vertices which corresponds to the time in milliseconds from 1970 UTC (timestamp of when the vertex was created.) When I pull back those vertices I want to be able to pull them back in decsending order. How can I create an index on that property in the decr order in Titan Management System ? Documentation seems vague on that. Closest thing I found is public

问题 It seems that in both approaches the vertex is stored and can be retrieved properly later. Common configuration: DseCluster dseCluster = DseCluster.builder() .addContactPoint("192.168.1.43") .build(); DseSession dseSession = dseCluster.connect(); GraphTraversalSource g = DseGraph.traversal( dseSession, new GraphOptions().setGraphName("graph") ); Approach 1: Vertex v = g.addV("User").property("uuid","testuuid231").next(); Approach 2: GraphStatement graphStatement = DseGraph

问题 We have vertex which will store various jobs and their types and counts as properties. I have to group by the status and their counts. I tried the following query which works for one property(receiveCount) g.V().hasLabel("Jobs").has("Type",within("A","B","C")).group().by("Type").by(fold().match(__.as("p").unfold().values("receiveCount").sum().as("totalRec")).select("totalRec")).next() I wanted to give 10 more properties like successCount, FailedCount etc.. Is there a better way to give that?

问题 I am trying to add edge to an existing node in gremlin-python. But graph traversal(g) object do not have addE method and vertex do not have addEdge method. 回答1: You can do it with a mid-traversal V() : >>> vFrom = g.V(1).next() >>> vTo = g.V(6).next() >>> g.V(vTo).as_('t').V(vFrom).addE("knows").to("t").toList() [e[13][1-knows->6]] I did learn that there is a bug that prevents this approach that uses withSideEffect() in TinkerPop 3.2.4: >>> g.withSideEffect("t",vTo).V(vFrom).addE("knows").to(

问题 Im toataly new with TitanDB. Im using it with cassandra & Java: Configuration file: storage.backend=cassandra storage.hostname=@CASSANDRA_CLUSTER_INNER_ADDRESS@ Java code: TitanGraph tg = TitanFactory.open(/*the configuration above*/); if (tg.isOpen()) { TitanManagement tm = tg.getManagementSystem(); PropertyKey key = tm.getPropertyKey(name); /* The rest of the nice working code */ } The Java code works fine, I can query the graph, do CRUD operations etc... Now, I want to query the graph

问题 I'm trying to make graph queries via a gremlin-shell to a Cassandra backend (locally or remotely). I downloaded a stock Gremlin Server distribution and then installed Titan (as described here in the manual-installation). http://s3.thinkaurelius.com/docs/titan/0.9.0-M1/server.html I added all the property settings and classpath : ~/gremlin-server-3.0.0.M6$ cat conf/titan-cassandra.properties gremlin.graph=com.thinkaurelius.titan.core.TitanFactory storage.backend=cassandrathrift storage

问题 I'm trying to export Neo4j graph (with 4318 nodes & 8145 Relationships) for testing using gremlin-groovy-2.3.0 using: g = new Neo4jGraph('/tmp/mygraph'); g.saveGraphML('mygraph.xml'); but getting list of errors when typing the 1st command in console ( gremlin-groovy-2.3.0/bin/gremlin.bat ), Last line of error: Error: Component: 'org.neo4j.kernel.StoreLockerLifecycleAdapter@5e1a7112 was successfully initialized, but failed to start I have copied the Neo4j database ( \data\graph.db ) to Gremli

问题 I'm using titan db 1.0.0 backed by a local dynamodb instance (which uses the 3.0 tinkerpop stack). I've spent more time than I'd like to admit trying to figure out why drop() wasn't working. In my use case I'm trying to remove a specific edge found via a traversal, but even graph.traversal().V().drop() wasn't working. I did much googling, but perhaps not with the right keywords. I finally figured out the issue which I'll specify in my answer. Hopefully others find this useful. 回答1: I finally

问题 This can be a bit problem occuring for me as i am working for more time than needed . Can you tell me can i add an edge between two vertices and here i have 50 vertices and i cant find a way to add edge on it having vertex id 0 to 49 . Till now I have use gremlin> (0..<50)each{g.addEdge(V[it],V[it+1]).next()} No such property: V for class: groovysh_evaluate gremlin> (0..<=49)each{g.addEdge(g.getVertex([NodeID]),g.getVertex([NodeID+1]),'abc')} groovysh_parse: 2: unexpected token: = @ line 2,

问题 I would like to know how to implement the following gremlin query g.V.has("mgrNo",T.neq,"0").sideEffect{g.V.has("empNo",it.mgrNo).next().addEdge("manages",it)} in java using GremlinPipeLine . I getting confused while implementing from the .next() onwards. GremlinPipeline pipe = new GremlinPipeline(graph).V().has("mgrNo",T.neq,0).sideEffect(new PipeFunction<Vertex, Object>(){ @Override public Object compute(Vertex vertex) { @SuppressWarnings("rawtypes") GremlinPipeline pipeline =