gremlin

问题 I want to add more than one property to a vertex, but from the outset do not explicitly know what those properties might be. For example, say for one person to be added as vertex to the graph, we have the following property dictionary: Person 1 { "id": 1, "first_name": "bob", "age": 25, "height": 177 } Maybe for another vertex to be added, a person has the following properties: Person 2 { "id": 2, "first_name": "joe", "surname": "bloggs", "occupation": "lawyer", "birthday": "12 September" }

问题 I need to incorporate the possibility of sending Gremlin scripts to my Neo4j 2.2.7 DB so I tried to install the thinkaurelius neo4j plugin by using one of the prebuilt releases. Unfortunately I guess those releases were built for older Neo4j versions (2.1.6) and, as a result, I got this error when I tried to start Neo4j from my Windows machine with Java 8: Starting Neo4j Server failed: javax.servlet.ServletException: org.neo4j.server.web.NeoServletContainer-e1dd969@ae4c07fc==org.neo4j.server

问题 I have a traversal that ends with a drop() to delete a vertex. I would like to be able to tell the difference between the drop() removing a vertex and the traversal just not matching anything. I tried adding an alias to one of the earlier nodes and select()ing it at the end of the traversal, but that doesn't return anything even when the traversal does match the graph. e.g. g.V('id', '1').as('flag') .out('has_child') .drop() .select('flag') .toList() 回答1: The trick is that drop() is a filter

问题 I have a Gremlin query in the String format (for example "g.V()"). I want to execute this String without submitting it to the GremlinServer. I use the below dependency: <dependency> <groupId>org.apache.tinkerpop</groupId> <artifactId>gremlin-driver</artifactId> <version>3.3.1</version> </dependency> Is there any way? 回答1: You can execute Gremlin string directly in GremlinGroovyScriptEngine or through the GremlinExecutor (which just passes the string to the GremlinGroovyScriptEngine but has

问题 In this stackoverflow question a suggestion was made to use the query supplied in the first answer to do a particular gremlin_python traversal. Namely g.V().has('name', 'USA').limit(1000).hasLabel('Country'). map(union(project('id','label'). by(id). by(label), valueMap()).unfold(). group(). by(keys). by(select(values))) I am able to import all but "keys" from the gremlin_python graph traversal library like the following from gremlin_python.process.graph_traversal import union, project,

问题 I Need to return some groups and people in that group, like this: Group A -----Person A -----Person B -----Person C Group B -----Person D -----Person E -----Person F How can I do that with gremlin. They are connected to group with a edge. 回答1: It is always helpful to include a sample graph with your questions on Gremlin preferably as a something easily pasted to the Gremlin Console as follows: g.addV('group').property('name','Group A').as('ga'). addV('group').property('name','Group B').as('gb

问题 I have a user vertex already created. g.V().has('user','username','vipul').as('user') I want to create a new 'group' vertex with some properties and also a new 'options' vertex with some other properties. g.addV(label,'group','group_name','DC11').as('group') g.addV(label,'options','command_line_arguments','-D -n').as('options') Now I want to create an edge from user to group and another edge from group to options. user ---> group, group ---> options Can these queries be combined, selecting a

问题 I have my Titan 1.0.0 and cassandra 2.1.2 setup running fine in my linux. When i start my gremlin using, ./gremlin.sh ../conf/gremlin-server/gremlin-server-cassandra-es.yaml I get the following error: \,,,/ (o o) -----oOOo-(3)-oOOo----- plugin activated: aurelius.titan plugin activated: tinkerpop.server plugin activated: tinkerpop.utilities SLF4J: Class path contains multiple SLF4J bindings. SLF4J: Found binding in [jar:file:/home/ec2-user/titan/titan-1.0.0- hadoop1/lib/slf4j-log4j12-1.7.5

问题 I want to create a vertex with a given label and some properties. Since the g.addVertexWithLabel() method only takes the label as an argument and I cannot find any v.addLabel() method, it seems that I have to add the properties one by one after creating the vertex. Or am I missing something here? 回答1: No. As of Titan 0.5.4, there is no API that allows you to add it all at once. In fact, even the Gremlin Groovy sugar of: g.addVertex([name:"stephen"]) just calls Element.setProperty(k,v) for

问题 I want to update an Azure CosmosDB Graph from Azure Functions with Gremlin.NET. I'm using 1.0.10 Functions Cli, .NET Framework 4.7.1 and a project with these dependencies: <PackageReference Include="Gremlin.Net" Version="3.3.2" /> <PackageReference Include="Microsoft.Azure.WebJobs.Extensions.DocumentDB" Version="1.2.0" /> <PackageReference Include="Microsoft.Azure.WebJobs.Extensions.DurableTask" Version="1.2.2-beta3" /> <PackageReference Include="Microsoft.NET.Sdk.Functions" Version="1.0.13"