CODEWITHSUNDEEP
gremlinamazon-neptune
Ragul M B
Ragul M B

Reputation: 204

How get both the vertices and edge value in neptune db

I am new to Neptune DB, I have created vertices and connected two vertices with edges and I have given some properties to both the edge and value

I want to retrieve both the edge and vertices properties values

Can someone provide me a sample query for this?

Thanks in advance.

Eg: Vertices: p1, P2, p3 Edges E1-connecting P1 and P2, E2- connecting P2 and P3 Vertices property: name Edge property: relation

Now I need to take out name and relation for all the vertices connected to P1

Upvotes: 2

Views: 1221

Answers (1)

Kfir Dadosh
Kfir Dadosh

Reputation: 1419

path step is what you are looking for. Using the by modulator you can select properties in a round-robin fashion, i.e. vertex-edge.

Start by locating p1 vertex: 

g.V().hasLabel("testV").has("name","p1")

Repeat traversal along edges with "relation" property:

.repeat(outE("testE").has("relation").inV()).until(__.not(outE("testE")))

Get the traversal path (or tree), and select "name" for vertices, and "relation" for edges using the by modulator:

.path().by("name").by("relation")

To see results in arrays of strings:

.local(unfold().fold())

Note that this traversal doesn't handle cycles, but that's another question.

If you need only first level neighbors, you can take a different approach:

g.V().hasLabel("testV").has("name","p2").bothE()
.project("relation","name")
.by(values("relation"))
.by(otherV().values("name"))

Upvotes: 2

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