Hi Andrey,
My responses below.
On 11 July 2014 01:17, Andrey Kovalev <[email protected]> wrote:
> First of all I've already tried to google for a solution but without any
> luck.
> I have a simple relation: User->owns->Group. I want to check that a
> particular group really belongs to a particular user.
> I am trying to run this query:
>
> final Vertex groupVx = database.getVertex(groupId);
> long count = groupVx.query().direction(Direction.IN).labels("owns").labels
> ("User").has("@rid", userId);
>
>
> 1. The query above fails, because User is not an edge. Is it possible
> to fix the query above to get a desired result using Blueprints?
>
> Try this solution:
long count = 0;
for( OrientVertex v : groupVx.getVertices(Direction.IN, "owns") ){
if( v.getIdentity().equals(userId) )
count++;
}
Or even this:
boolean isPresent = groupVx.command(new OSQLPredicate(userId + " in
out('owns')));
>
> 1. Am I right that GremlinPipeline is implemented by Tinkerpop and all
> queries are done in-memory without using native query syntax of OrientDB?
>
> Gremlin works on top of Blueprints that most of the times (depends by many
things) translates query in OrientDB SQL, the rest works in memory by
fetching vertices and edges from OrientDB.
Lvc@
>
>
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