datastax-enterprise-graph

how to query by vertex id in Datastax DSE 5.0 Graph in a concise way?

阅读更多关于 how to query by vertex id in Datastax DSE 5.0 Graph in a concise way?

问题 It seems that the unique id for vertices is community_id in DSE Graph. I have found that this works (id is long) : v = g.V().has("VertexLabel","community_id",id).next() none of those work: v = g.V("community_id",id).next() v = g.V("community_id","VertexLabel:"+id).next() v = g.V(id).next() v = g.V().hasId(id).next() v = g.V().hasId("VertexLabel:"+id).next() v = g.V("VertexLabel:"+id).next() Edit After some investigation I found that for a vertex v, v.id() returns a LinkedHashMap: Vertex v =

Error when launching the graph (DSEGraphFrame )

阅读更多关于 Error when launching the graph (DSEGraphFrame )

问题 I have a dse graph in validation/prod environement. The problem occurs when I try to launch a DSEGraphFrame query using Spark in Scala. val graph = spark.dseGraph("my_graph") generates the following exception: Exception in thread "main" com.datastax.driver.core.exceptions.InvalidQueryException: The method DseGraphRpc.getSchemaBlob does not exist. Make sure that the required component for that method is active/enabled at com.datastax.driver.core.exceptions.InvalidQueryException.copy

How to create a graph and its schema without using Datastax Studio but through Java?

阅读更多关于 How to create a graph and its schema without using Datastax Studio but through Java?

问题 I was trying to create my first connection with DSE Graph through java.. public static void main(String args[]){ DseCluster dseCluster = null; try { dseCluster = DseCluster.builder() .addContactPoint("192.168.1.43") .build(); DseSession dseSession = dseCluster.connect(); GraphTraversalSource g = DseGraph.traversal(dseSession, new GraphOptions().setGraphName("graph")); GraphStatement graphStatement = DseGraph.statementFromTraversal(g.addV("test")); GraphResultSet grs = dseSession.executeGraph

How to return a Vertex in the tinkerpop/gremlin format instead of the DSE graph format?

阅读更多关于 How to return a Vertex in the tinkerpop/gremlin format instead of the DSE graph format?

问题 I am trying to return a Vertex (in tinkerpop format) that it was just created with Gremlin: DseCluster dseCluster = DseCluster.builder() .addContactPoint(DbC.dseHost) .build(); DseSession dseSession = dseCluster.connect(); GraphTraversal traversal = graph.addV(VertexLabels.User) .property("username", "testuser") GraphStatement graphStatement = DseGraph.statementFromTraversal( traversal ); GraphResultSet grs = dseSession.executeGraph(graphStatement.setGraphName(DbC.graphName)); Vertex v = grs

how to return subgraph from gremlin that is in an easily consumable format for Java

阅读更多关于 how to return subgraph from gremlin that is in an easily consumable format for Java

问题 I am very frustrated about very simple things when I try to do a single traversal and bring a lot of stuff from DSE Graph 5.0 at once using Gremlin.. In my simplified case I have: 1 entity with specific uuid entity can have zero (see optional) or more types I need to be able to return the entity and the types What I have so far that works is very ugly :( List list = g.V().hasLabel("Entity").has("uuid","6708ec6d-4518-4159-9005-9e9d642f157e").as("entity") .optional(outE("IsOfType").as("types"))

executeGraph() is not really needed in Datastax DSE 5.0 Graph with Java?

阅读更多关于 executeGraph() is not really needed in Datastax DSE 5.0 Graph with Java?

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

Iterating a GraphTraversal with GraphFrame causes UnsupportedOperationException Row to Vertex conversion

阅读更多关于 Iterating a GraphTraversal with GraphFrame causes UnsupportedOperationException Row to Vertex conversion

问题 The following GraphTraversal<Row, Edge> traversal = gf().E().hasLabel("foo").limit(5); while (traversal.hasNext()) {} causes the following Exception: java.lang.UnsupportedOperationException: Row to Vertex conversion is not supported: Use .df().collect() instead of the iterator at com.datastax.bdp.graph.spark.graphframe.DseGraphTraversal.iterator$lzycompute(DseGraphTraversal.scala:92) at com.datastax.bdp.graph.spark.graphframe.DseGraphTraversal.iterator(DseGraphTraversal.scala:78) at com

how to query by vertex id in Datastax DSE 5.0 Graph in a concise way?

阅读更多关于 how to query by vertex id in Datastax DSE 5.0 Graph in a concise way?

It seems that the unique id for vertices is community_id in DSE Graph. I have found that this works (id is long) : v = g.V().has("VertexLabel","community_id",id).next() none of those work: v = g.V("community_id",id).next() v = g.V("community_id","VertexLabel:"+id).next() v = g.V(id).next() v = g.V().hasId(id).next() v = g.V().hasId("VertexLabel:"+id).next() v = g.V("VertexLabel:"+id).next() Edit After some investigation I found that for a vertex v, v.id() returns a LinkedHashMap: Vertex v = gT.next(); Object id = v.id(); System.out.println(id); System.out.println(id.getClass()); System.out

Gremlin: adding edges between nodes having the same property

阅读更多关于 Gremlin: adding edges between nodes having the same property

问题 I am very new to Gremlin. I am trying to build a graph on DSE graph using Gremlin. I am able to create the vertices: a = graph.addVertex(label, 'label1', 'key', 1) b = graph.addVertex(label, 'label1', 'key', 2) c = graph.addVertex(label, 'label2', 'key', 1) d = graph.addVertex(label, 'label2', 'key', 2) Now i am looking to automatically add edges between two nodes with differents label where the property 'key' matches (i.e create and edge between a and c, and between b and c). I am stuggling

How to return a Vertex in the tinkerpop/gremlin format instead of the DSE graph format?

阅读更多关于 How to return a Vertex in the tinkerpop/gremlin format instead of the DSE graph format?

I am trying to return a Vertex (in tinkerpop format) that it was just created with Gremlin: DseCluster dseCluster = DseCluster.builder() .addContactPoint(DbC.dseHost) .build(); DseSession dseSession = dseCluster.connect(); GraphTraversal traversal = graph.addV(VertexLabels.User) .property("username", "testuser") GraphStatement graphStatement = DseGraph.statementFromTraversal( traversal ); GraphResultSet grs = dseSession.executeGraph(graphStatement.setGraphName(DbC.graphName)); Vertex v = grs.one().as(Vertex.class); and I am getting this exception... java.lang.ClassCastException: com.datastax