CODEWITHSUNDEEP
gremlinjanusgraph
Sagar
Sagar

Reputation: 33

Can we find all the labels available in a graph in JanusGraph?

I want to get the list of all the labels available in the graph, but I am unaware of the schema. Is there any way to find out the list of all the labels?

I have tried the following:

g.V().Label().values()
g.V().hasLabel().values()

but they are not working.

Upvotes: 3

Views: 2183

Answers (2)

J. Lerman
J. Lerman

Reputation: 83

In Scala, if all you have is a GraphTraversalSource from a JanusGraph, you can do:

import org.janusgraph.core.JanusGraph

val graph: JanusGraph = g.getGraph.asInstanceOf[JanusGraph]
val mgmt: JanusGraphManagement = graph.openManagement()

and then from there get your iterable of vertex labels:

 val vLabels: Iterable[VertexLabel] = mgmt.getVertexLabels.asScala

(The .asScala only works if you have imported gremlin-scala; otherwise you can omit it and you'll get a Java iterator.)

Upvotes: 0

stephen mallette
stephen mallette

Reputation: 46226

In Gremlin you would do:

g.V().label().dedup()

but that would require a scan of all vertices in the graph which would be expensive. JanusGraph has schema you can query with the JanusGraphManagement class. 

JanusGraphManagement mgmt = graph.openManagement();
Iterable<VertexLabel> labels = mgmt.getVertexLabels();

Upvotes: 7

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