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Questions tagged [gremlin]

Gremlin is the graph traversal language and virtual machine of Apache TinkerPop™

Gremlin is a graph traversal language and virtual machine, developed by Apache TinkerPop. Gremlin is designed to work with any TinkerPop-enabled graph system, such as Titan, OrientDB, Neo4j, RDF stores like Stardog and Blazegraph, and others.

For more information, see the most recent reference documentation for TinkerPop.

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Neo4j - Cypher vs Gremlin query language

I'm starting to develop with Neo4j using the REST API. I saw that there are two options for performing complex queries - Cypher (Neo4j's query language) and Gremlin (the general purpose graph query/traversal language). Here's what I want to know -…
Rubinsh
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Gremlin remove all Vertex

I know how to remove a vertex by id in Gremlin. But now I'm need to cleanup the database. How do I delete multiple vertices? Deleting 1 v is like this: ver = g.v(1) g.removeVertex(ver) I mean something like SQL TRUNCATE. How do you remove…
Aleksandrenko
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How to perform pagination in Gremlin

In Tinkerpop 3, how to perform pagination? I want to fetch the first 10 elements of a query, then the next 10 without having to load them all in memory. For example, the query below returns 1000,000 records. I want to fetch them 10 by 10 without…
Mohamed Taher Alrefaie
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How to start Titan graph server and connect with gremlin?

I've been playing with Titan graph server for a while now. And my feeling is that, despite an extensive documentation, there is a lack of Getting started from scratch tutorial. My final goal is to have a titan running on cassandra and query with…
Mermoz
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Why do you need to fold/unfold using coalesce for a conditional insert?

I'm trying to understand how this pattern for a conditional insert works: g.V() .hasLabel('person').has('name', 'John') .fold() .coalesce( __.unfold(), g.addV('person').property('name', 'John') ).next(); What is the purpose of the…
cejast
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CosmosDB Graph : "upsert" query pattern

I am new to Gremlin query language. I have to insert data on a Cosmos DB graph (using Gremlin.Net package), whether the Vertex (or Edge) already exists in the graph or not. If the data exists, I only need to update the properties. I wanted to use…
Rom Eh
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How to start a new connection with CosmoDB graph database using gremlin on version ^3

I am trying to create a new gremlin client in node js, but I cannot find any documentation how to set up the connection with both a URL and a primary key (as generated in Azure CosmosDB). Examples are available how to do this in versions < v3, such…
Michal Paszkiewicz
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How can I use gremlin-console to remotely create and access variables?

I remotely connect to a gremlin server using gremlin-console(which is janusgraph), but when I create a variable and access it, it doesn't work. My ultimate goal is to use gremlin-console to create index... gremlin> :remote connect tinkerpop.server…
Gao
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How to create a bidirectional edge between two vertices using gremlin?

What is the best way to create a bidirectional edge between two vertices using gremlin. Is there a direct command which adds the edge or should we add two edges like vertex X -> Vertex Y and vertex Y -> Vertex X?
HEART94
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Unable to create a composite index, stuck at INSTALLED

I'm unable to create an index. My Gremlin code is as follows: usernameProperty = mgmt.getPropertyKey('username') usernameIndex = mgmt.buildIndex('byUsernameUnique',…
Fook
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Gremlin update existing property

How do I update an existing property of a node in a graph using Gremlin? The following method creates two properties "timestamp" with 2 different values, instead of updating the existing property…
Auricopter
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Is it possible to visualize the output of a graph query (Gremlin or SPARQL) as nodes and edges in Amazon Neptune?

GREMLIN and SPARQL only define the APIs for graph queries. How do I use the API responses and and plot that as an actual graph, with edges and vertices? Is there something like MySQL Workbench for graphs?
The-Big-K
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Parsing dates without timezone conversion

I am working with groovy (gremlin to traverse a graph database to be exact). Unfortunately, because I am using gremlin, I cannot import new classes. I have some date values that I wish to convert to a Unix timestamp. They are stored as UTC in the…
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JanusGraph BulkLoading CSV with ScriptInputFormat

I am trying to load a CSV file into a JanusGraph. As I understand it, I need to create my graph and the schema, then use the BulkLoaderVertexProgram with my own custom groovy script to parse a csv file. Doing that, it seems to work as I can see the…
Etienne Sauriol
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Gremlin - only add a vertex if it doesn't exist

I have an array of usernames (eg. ['abc','def','ghi']) to be added under 'user' label in the graph. Now I first want to check if the username already exists (g.V().hasLabel('user').has('username','def')) and then add only those for which the…
Vipul Sharma
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