I know how to remove a vertex by id, but I need to delete multiple vertices (clean the db).
Deleting 1 v is like this:
ver = g.v(1)
g.removeVertex(ver)
If you have the vertex already then simply v. remove() . Any of the 3 will serve.
Apache TinkerPop is an open source computing framework for graph databases and graph analytic systems. Designed to appeal to software developers, TinkerPop lets developers add graph computing capabilities to their applications without worrying about developing APIs, graph processing engines, or graph algorithms.
In more recent terms as of Gremlin 2.3.0, removal of all vertices would be best accomplished with:
g.V.remove()
UPDATE: For version Gremlin 3.x you would use drop():
gremlin> graph = TinkerFactory.createModern()
==>tinkergraph[vertices:6 edges:6]
gremlin> g = graph.traversal()
==>graphtraversalsource[tinkergraph[vertices:6 edges:6], standard]
gremlin> g.V().drop().iterate()
gremlin> graph
==>tinkergraph[vertices:0 edges:0]
Note that drop()
does not automatically iterate the Traversal
as remove()
did so you have to explicitly call iterate()
for the deletion to occur. Iteration in the Gremlin Console is discussed in detail in this tutorial.
Also, consider that different graph systems will potentially have their own methods for more quickly and efficiently removing all data in that system. For example, JanusGraph has this approach:
JanusGraphFactory.drop(graph)
where "graph" is a JanusGraph
instance you want cleared out.
If you are using Tinkerpop3 (Titan 1.0.0), as said before, the command is:
g.V().drop()
This only works if you are using the Gremlin interactive REPL interface. Why? drop
returns an iterator that must be traversed to be applied and the Gremlin REPL interface automatically iterates over returned iterators.
If (like me) you are using an HTTP or WebSocket interface to Gremlin, you must explicitly iterate over the returned iterator:
g.V().drop().iterate()
...to commit the transaction. In Titan, transactions are opened implicitly but must be closed explicitly:
g.tx().commit()
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