Chain query

[Disruptive Solutions]

Oke I have been filling TitanDB with nodes and edges. Now I want to find a related node or instance which is in distance 4+ from the primary node from which I am starting the search.

In SPARQL I just can use the + sign in the query to look beyond the 1st distance. How can I do this in Gremlin? I am using Java (API) to make Gremlin queries.

Thanks in advance.

[Daniel Kuppitz]

The following query will start at particular vertex, then traverse in both direction - preventing circular paths - and emit every vertex at depth 4+:

g.V(startNodeId).repeat(both().simplePath()).emit(loops().is(gte(4)))

Cheers,

Daniel

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[Disruptive Solutions]

loops() is a own made method?

2016-12-04 3:03 GMT+01:00 Daniel Kuppitz <m...@gremlin.guru>:

The following query will start at particular vertex, then traverse in both direction - preventing circular paths - and emit every vertex at depth 4+:

g.V(startNodeId).repeat(both().simplePath()).emit(loops().is(gte(4)))

Cheers,

Daniel

On Sat, Dec 3, 2016 at 10:29 PM, Disruptive Solutions <disruptivesolutionsnl@gmail.com> wrote:

Oke I have been filling TitanDB with nodes and edges. Now I want to find a related node or instance which is in distance 4+ from the primary node from which I am starting the search.

In SPARQL I just can use the + sign in the query to look beyond the 1st distance. How can I do this in Gremlin? I am using Java (API) to make Gremlin queries.

Thanks in advance.

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[Disruptive Solutions]

<dependency>
                <groupId>org.apache.tinkerpop</groupId>
                <artifactId>gremlin-driver</artifactId>
                <version>3.0.2-incubating</version>
</dependency>

Does not have loops()

But when I use:
3.2.0-incubating loops() seems to be there but I get:
Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/tinkerpop/gremlin/process/traversal/TraversalStrategy$VendorOptimizationStrategy
   
I use the "stable??"
<dependency>
            <groupId>com.thinkaurelius.titan</groupId>
            <artifactId>titan-cassandra</artifactId>
            <version>1.0.0</version>
         </dependency>
         <dependency>
            <groupId>com.thinkaurelius.titan</groupId>
            <artifactId>titan-es</artifactId>
            <version>1.0.0</version>
         </dependency>

Op zondag 4 december 2016 12:33:41 UTC+1 schreef Disruptive Solutions:

[Daniel Kuppitz]

You'll have to use a lambda in older version of TP:

g.V(startNodeId).repeat(both().simplePath()).emit {it.loops() >= 4}

Cheers,

Daniel

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[Disruptive Solutions]

And it = iterator??

Op zondag 4 december 2016 17:37:31 UTC+1 schreef Daniel Kuppitz:

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[Daniel Kuppitz]

No, it = it. It's the current traverser. You can give "it" another name if you want:

g.V(startNodeId).repeat(both().simplePath()).emit {traverser -> traverser.loops() >= 4}

"it" is just the default name for single argument closures provided by Groovy.

Cheers,

Daniel

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[Disruptive Solutions]

Daniel... I am using Java to address the code below... so it wants to know the variable.

Op zondag 4 december 2016 21:35:10 UTC+1 schreef Daniel Kuppitz:

[Daniel Kuppitz]

So? Did that not work in 3.0.2?

g.V(startNodeId).repeat(both().simplePath()).emit(traverser -> traverser.loops() >= 4)

Cheers,

Daniel

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