Save gremlin query result as a GraphML?

[Alonci]

Hi,

Is there a simple way to convert GremlinPipeline query result to Graph object?

I am trying to save the result of a query in a graphML format.

thank

Alon

[Stephen Mallette]

We've discussed how to do a natural way to do a subgraph in gremlin
for a while, but no solid ideas have yet been realized. I typically
try to write the traversal in such a way that it yields the easiest
way possible to sideEffect out the elements i want into another graph.

Stephen

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[Marko A. Rodriguez]

Hi,

I'll be going through this process next week for a client so I'll give a heads up on the pattern I ultimately use. But yes, Stephen's technique is what first came to my mind.

1. Use a Gremlin select()-based traversal to grab elements out of one graph.
2. Insert into TinkerGraph.
3. GraphMLWriter.outputGraph(tinkerGraph).

Marko.

http://markorodriguez.com

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[Derrick Johnson]

Hi,

I'm curious about what you could find on this.  For example, a method which takes in the parameters of your query, does the traversal, aggregates the results, and returns the result as a Graph object.

Best Wishes,
-Derrick

[Yanxin Zhang]

Hello Marko,

Sorry to dig the old question and ask the similar question here. 

I want to extract the sub-graph from gremlin traversal, and put it into gephi. 

I am not quite sure how to use select()-based traversal to grab elements and dump them into TinkerGraph.  

Can you give me some simple example? 

Yanxin

[Stephen Mallette]

Here's  the simple way I was suggesting:

http://gremlindocs.com/#recipes/subgraphing

Using select() isn't so different:

gremlin> g = TinkerGraphFactory.createTinkerGraph()                      

==>tinkergraph[vertices:6 edges:6]

gremlin> g.v(1).as('marko').outE.as('markoTo').inV.as('something').select

==>[marko:v[1], markoTo:e[7][1-knows->2], something:v[2]]

==>[marko:v[1], markoTo:e[8][1-knows->4], something:v[4]]

==>[marko:v[1], markoTo:e[9][1-created->3], something:v[3]]

I've used to select() to get the "marko" subgraph...just write those vertices/edges into a new TinkerGraph and you have your new subgraph.  It remains to be seen if we could have a more fluid way of doing subgraphing in TinkerPop3.

Stephen

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[ni...@knoldus.com]

Hi stephen,

can you please tell us how do we export titangraph to graphml?. I went through tinkerpop documentation but didn't find anything.

Thanks 

[Dylan Millikin]

Hey,

Unless I'm misunderstanding, provided a titan graph (graph) the following should work:

graph.io(IoCore.graphml()).writeGraph("path/to/graphml.xml");

see : http://tinkerpop.apache.org/docs/3.2.0-incubating/reference/#_graphml_reader_writer

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[ni...@knoldus.com]

Hi Dmill,

Thanks for your reply. I have one more question, lets say that is execute :> x =1 in my gremlin shell which sends x = 1 to gremlin server then how can i retrieve back value of x ? 

Thanks

Nitin

[Dylan Millikin]

You can do it with :

         \,,,/
         (o o)
-----oOOo-(3)-oOOo-----

gremlin> x = 1

==>1

gremlin> x

==>1

see : 

http://www.gremlinbin.com/bin/view/5739c34e32ba3

If you're using a driver to communicate with gremlin-server you will need to check the driver documentation and run your queries in "session" mode.

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