create multiple edges having vertex id number 0 to 49

问题

This can be a bit problem occuring for me as i am working for more time than needed . Can you tell me can i add an edge between two vertices and here i have 50 vertices and i cant find a way to add edge on it having vertex id 0 to 49 . Till now I have use

gremlin> (0..<50)each{g.addEdge(V[it],V[it+1]).next()}
No such property: V for class: groovysh_evaluate
gremlin> (0..<=49)each{g.addEdge(g.getVertex([NodeID]),g.getVertex([NodeID+1]),'abc')}
groovysh_parse: 2: unexpected token: = @ line 2, column 6.
   (0..<=49)each{g.addEdge(g.getVertex([NodeID]),g.getVertex([NodeID+1]),'abc')}
        ^

1 error

回答1:

It looks like you just want to iterate through the vertices and add an edge from one vertex to the next until they are all connected. First, I'll create the 50 vertices:

gremlin> g.inject((0..<50).toArray()).as('i').addV('myid',select('i')).iterate()

Then I'll add the edges:

gremlin> (0..<49).each { def v = g.V().has('myid',(long) it).next(); v.addEdge('knows',g.V().has('myid',(long)it+1).next()) }

I cast to "long" in my example above as I was using a TinkerGraph. That cast may not be necessary for dynamo. Note that you can combine all of this into a single line with:

gremlin> g.addV().repeat(__.as('a').addV().as('b').
                            select(last,'a','b').
                            addE('.').from('a').to('b').
                            inV().as('a')).
                  times(49)

The above will create both the vertices and the edges at the same time in an iterative fashion. Note that "49" represents the number of edges you'd like to have.

You have spread this same question across multiple tags in StackOverflow including: here and here. In all cases you have lots of basic syntax errors and are calling methods that don't exist and referencing objects that don't exist. I suggest you focus on more of the basics of Java and Groovy before digging too deeply into dynamodb and TinkerPop. At a mimimum, start with the TinkerPop tutorials (like the one mentioned in the comment to your question) to get a better feel for the APIs and how the programmign syntax.

来源：https://stackoverflow.com/questions/40907529/create-multiple-edges-having-vertex-id-number-0-to-49

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