[Neo] Checking whether a relationship exists between two nodes...
rick.bullotta at burningskysoftware.com
Tue Feb 2 23:47:59 CET 2010
You should be using the hasRelationship(...) method of the Node object.
From: user-bounces at lists.neo4j.org [mailto:user-bounces at lists.neo4j.org] On
Behalf Of Maria Giatsoglou
Sent: Tuesday, February 02, 2010 5:45 PM
To: user at lists.neo4j.org
Subject: [Neo] Checking whether a relationship exists between two nodes...
I am creating a project that performs a number of benchmark tasks on Neo.
One of the tests measures the required time for creating a relationship
between two neo nodes A and B.
However, before creating the relationship, it should firs be checked
whether a relationship of the same type already exists
between these two nodes. My current implementation calls the
for the A node and then iterates over the returned Iterable object
checking whether a relationship's end node is equal to node B. If such
a relationship does not exist, then the required relationship is created
between nodes A and B.
However, this technique seems to be very slow, with the creation of a
relationship (including the check operation) taking around 57msec to
complete. Is there a faster way to implement this operation? I
considered trying to modify the LuceneIndexService implementation in
order to enable indexing
relationships apart from nodes. Do you recommend such an approach for
Many thanks in advance,
Neo mailing list
User at lists.neo4j.org
More information about the User