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Iterating over relationships of a specific type
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vlg  
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 More options Apr 30 2012, 10:28 am
From: vlg <vince.leguill...@gmail.com>
Date: Mon, 30 Apr 2012 07:28:11 -0700 (PDT)
Local: Mon, Apr 30 2012 10:28 am
Subject: Iterating over relationships of a specific type
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Hi there,

Using Neo4j 1.6.2, what would be the best way to iterate over /
retrieve all the relationships of a specific type ?

I guess I could use an index on a property that would store the name
of the relationship type, but this means extra-storage and extra-
operations upon adding edges, so I was wondering if there were any
built-in method to achieve this.

Thanks,
Vincent


 
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Michael Hunger  
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 More options Apr 30 2012, 10:42 am
From: Michael Hunger <michael.hun...@neotechnology.com>
Date: Mon, 30 Apr 2012 16:42:56 +0200
Local: Mon, Apr 30 2012 10:42 am
Subject: Re: [Neo4j] Iterating over relationships of a specific type
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As this would be a graph global operation it is not supported as of now, it would be even more expensive to do w/o an index.

Without an index you'd have to:

for (Node n : GlobalGraphOperations.at(gdb).getAllNodes()) {
    Relationship rel = n.getRelationships(TYPE,Direction.OUTGOING);
    // do something with the relationship

}

or with cypher:

start n=node(*) match n-[r:TYPE]->() return r

see here for an example: http://tinyurl.com/7ewusrs

Michael

Am 30.04.2012 um 16:28 schrieb vlg:


 
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Mattias Persson  
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 More options May 1 2012, 5:06 am
From: Mattias Persson <matt...@neotechnology.com>
Date: Tue, 1 May 2012 11:06:10 +0200
Local: Tues, May 1 2012 5:06 am
Subject: Re: [Neo4j] Iterating over relationships of a specific type
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2012/4/30 Michael Hunger <michael.hun...@neotechnology.com>

> As this would be a graph global operation it is not supported as of now,
> it would be even more expensive to do w/o an index.

> Without an index you'd have to:

> for (Node n : GlobalGraphOperations.at(gdb).getAllNodes()) {
>    Relationship rel = n.getRelationships(TYPE,Direction.OUTGOING);
>    // do something with the relationship
> }

Or (this might be faster since it's a linear scan of the relationship
store, if all relationships aren't already loaded):

for ( Relationship rel :
GlobalGraphOperations.at(gdb).getAllRelationships() ) {
    if ( rel.isType( myType ) ) {
        // do something with the relationship
    }

--
Mattias Persson, [matt...@neotechnology.com]
Hacker, Neo Technology
www.neotechnology.com

 
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