tinkerpop3

问题 We currently use gremlin.net library in a net core 3.0 application to connect to Janusgraph db. We need to execute below query in janusgraph g.V('12345').outE('myedge').has('datetime',lt(1581922847)).order().by('datetime', incr).limit(100).valueMap().as('time').inV().as('user').select('time','user') The query runs fine as long as we dont have inV() part. If we have inV() , we are facing below error, ScriptEvaluationError: java.util.LinkedHashMap cannot be cast to org.apache.tinkerpop.gremlin

问题 If i have a pre-run route from the shortestPath which is returned as a list of vertex, how can i then re-run that on a graph with the same set of vertices, to return the edges which it has used. i.e. PATH = (V(1), V(2), V(3), V(4), V(5), V(6)), how would the command look to replay that path on a new graph with the same vertices, returning the edges, which contain different properties. So to confirm i need to input this explicit Path to return the edges? 回答1: If I knew my path was [v[1],v[4],v

问题 Just started out with Tinkerpop and Janusgraph, and I'm trying to figure this out based on the documentation. I have three datasets, each containing about 20 milions rows (csv files) There is a specific model in which the variables and rows need to be connected, e.g. what are vertices, what are labels, what are edges, etc. After having everything in a graph, I'd like to of course use some basic Gremlin to see how well the model works. But first I need a way to get the data into Janusgraph.

问题 I am using Titan 1.0.0 supported by cassandra 2.1.7 as backend storage. While trying to execute the same query on gremlin console and java program, I am getting 2 the output in two different formats. I am using the gremlin console provided by titan-1.0.0-hadoop1 and for java I am using TinkerPop Gremlin 3.0.1-incubating. Gremlin Console: gremlin> g.V().has('msid',within(-2128958273, 2147477890)).as('in').local(outE('hie_child').has('hostid_e',within(153,83)).order().by('hrank',incr).limit(5))

问题 I struggled with this for hours before finding out that you have to use from_ instead of from when using gremlin javascript. After digging through the source code I finally found out that the code is using from_ instead of from (see code). Since I'm a newbie this comes off as strange because its counterpart to is still to (and not to_ , see code here) I googled everywhere but couldn't find the reason why this works this way, and feel uneasy about using the underscore version since most of the

问题 I Am trying to convert the following graphSon Format into a graph instance using the follwing command graph.io(IoCore.graphson()).reader().create().readGraph(stream, graph); But while running converting the GRaphSON into graph instance given below {"id":0, "label":"buyer", "outE": {"email_is": [{"id":0,"inV":1, "properties":{"weight":1} } ]} ,"properties": {"buyer": [{ "id":0,"value":"buyer0" }] ,"age": [{ "id":1,"value":10}] }} {"id":1, "label":"email", "inE": { "email_is": [{"id":1,"outV":0

问题 Titan 1.0 [Berkeley+ Remote Elastic Search] we are using this combination of Titan. Following is the properties file - storage.backend=berkeleyje storage.directory=D:/other-projects/graph-db/titan/enron-tk3/db/berkeley index.search.backend=elasticsearch index.search.index-name=akshayatitan index.search.hostname=localhost index.search.elasticsearch.client-only=true index.search.elasticsearch.local-mode=false We are only using Mixed Index. Now we add a node with few properties through Java code

问题 I have a FramedGraph object with Vertices of different classes, for instance Person and Location. I would like to retrieve all vertices of the "Person" class. Here is my current method. public List<Person> listPeople() { List<Person> people = new ArrayList<Person>(); Iterator iterator = g.getVertices().iterator(); while (iterator.hasNext()) { Vertex v = (Vertex) iterator.next(); Person p = (Person) g.getVertex(v.getId(), Person.class); people.add(p); } return people; } This feels terrifically

问题 I have a FramedGraph object with Vertices of different classes, for instance Person and Location. I would like to retrieve all vertices of the "Person" class. Here is my current method. public List<Person> listPeople() { List<Person> people = new ArrayList<Person>(); Iterator iterator = g.getVertices().iterator(); while (iterator.hasNext()) { Vertex v = (Vertex) iterator.next(); Person p = (Person) g.getVertex(v.getId(), Person.class); people.add(p); } return people; } This feels terrifically

问题 I am starting to work with Titan and I am using cassandra as backend store. When I start titan.sh cassandra and elasticsearch were started but the gremlin server did not. I was looking at titan.sh and I have seen that it start gremlin server with conf/gremlin-server/gremlin-server.yaml. The problem is that the gremlin-server.yaml is configured as this: graphs: { graph: conf/gremlin-server/titan-berkeleyje-server.properties} Using BerkeleyDb. I have not seen the cassandra.yaml for Gremlin