Thanx Mattias. Can I download a tar.gz or zip file from somewhere? I'm not using Maven in my projects yet...I mean I'm not very comfortable with it.
Arijit On 30 July 2010 17:33, Mattias Persson <[email protected]> wrote: > Looping through relatiomships manually is the way to go. However > there's a new component in > https://svn.neo4j.org/laboratory/components/lucene-index/ which can > index relationships and do fast lookups on whether or not a > relationship (with a certain attribute even) exists between two nodes. > > You'll need to go with the latest kernel then as well (as seen in > https://svn.neo4j.org/laboratory/components/lucene-index/pom.xml). > > 2010/7/30, Arijit Mukherjee <[email protected]>: >> Hi All >> >> I have a requirement where I must check if there is an already >> existing relationship between two nodes (say N1 and N2). Right now, >> I'm doing it as follows: >> >> boolean found = false; >> final Iterable<Relationship> currentRels = >> N1.getRelationships(RelTypes.KNOWS, Direction.OUTGOING); >> for (Relationship rel : currentRels) { >> found = rel.getEndNode().equals(N2); >> if (found) { >> do something - like add some property to the existing relationship; >> break; >> } >> } >> if (!found) { >> create new relationship between N1 and N2; >> } >> >> This means, for a high volume of data, all the relations going out of >> N1 will be retrieved and checked - and this seems costly. I'm using >> the 1.0 API, and wasn't able to find anything that would directly >> check whether N1 has an outgoing relationship with N2 - like >> N1.hasRelationship(N2, Direction.OUTGOING) - or something similar. I >> think there was a similar mail sometime ago. Has there been any >> updates lately which allows such checks? Or, is there any other direct >> way to do this with the 1.0 API? >> >> Regards >> Arijit >> >> -- >> "And when the night is cloudy, >> There is still a light that shines on me, >> Shine on until tomorrow, let it be." >> _______________________________________________ >> Neo4j mailing list >> [email protected] >> https://lists.neo4j.org/mailman/listinfo/user >> > > > -- > Mattias Persson, [[email protected]] > Hacker, Neo Technology > www.neotechnology.com > _______________________________________________ > Neo4j mailing list > [email protected] > https://lists.neo4j.org/mailman/listinfo/user > -- "And when the night is cloudy, There is still a light that shines on me, Shine on until tomorrow, let it be." _______________________________________________ Neo4j mailing list [email protected] https://lists.neo4j.org/mailman/listinfo/user
