Re: [Neo4j] New Bug Logged - Gremlin 114
Thanks Romiko,
will look into it first time when I have time. How critical is it for you?
Cheers,
/peter neubauer
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brew install neo4j neo4j start
heroku addons:add neo4j
On Wed, Nov 30, 2011 at 1:31 AM, Romiko Derbynew
romiko.derby...@readify.net wrote:
Hi,
New bugged logged at: https://github.com/neo4j/community/issues/114
Details below for others to peruse.
Gremlin Table Projections - Column Order Incorrect when using chained
.As('x').As('y')
EXPECTED Order: Createdy, ReferralGroup, ReferralId, ReferralData
When AS statements appear next to each other.
Consider A (WORKS - But not logical - have to reverse order when more than 1
AS statement is chained together right after each other for column array to
match):
{script:g.v(0).outE[[label:'HOSTS']].inV.filter{ it.Key == 'romikoagency'
}.inE[[label:'USER_BELONGS_TO']].outV.filter{ it.Username ==
'romiko.derbynew'
}.as('CreatedBy').outE[[label:'USER_LINKED_TO_PROGRAM']].inV.as('ReferralGroup').inE[[label:'HAS_SUGGESTED_PROGRAM']].outV.inE[[label:'REFERRAL_HAS_DECISIONS_SECTION']].outV.as('ReferralDate').as('ReferralId').table(new
Table()){it.Username}{it.Name}{it.UniqueId}{it.DateInitiatedUtc}.cap
}
notice: as('ReferralDate').as('ReferralId') and then notice the column order
below is opposite this: columns ReferralId, ReferralDate ]
Results
[ [ {
data : [ [ romiko.derbynew, Testa, 331, /Date(1322007153048+1100)/ ],
[ romiko.derbynew, Testa, 321, /Date(1322003375637+1100)/ ]],
columns : [ CreatedBy, ReferralGroup, ReferralId, ReferralDate ]
} ] ]
Consider B (Does not work - this is more LOGICAL from gremlin perspective but
is bugged, the Chained AS right after each other gets reversed in the column
array.)
{script:g.v(0).outE[[label:'HOSTS']].inV.filter{ it.Key == 'romikoagency'
}.inE[[label:'USER_BELONGS_TO']].outV.filter{ it.Username ==
'romiko.derbynew'
}.as('CreatedBy').outE[[label:'USER_LINKED_TO_PROGRAM']].inV.as('ReferralGroup').inE[[label:'HAS_SUGGESTED_PROGRAM']].outV.inE[[label:'REFERRAL_HAS_DECISIONS_SECTION']].outV.as('ReferralId').as('ReferralDate').table(new
Table()){it.Username}{it.Name}{it.UniqueId}{it.DateInitiatedUtc}.cap
}
Notice: .as('ReferralId').as('ReferralDate') and then the columns columns
ReferralDate, ReferralId ]
Results
[ [ {
data : [ [ romiko.derbynew, Testa, 331, /Date(1322007153048+1100)/ ]],
columns : [ CreatedBy, ReferralGroup, ReferralDate, ReferralId ]
} ] ]
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Re: [Neo4j] How to return the start nodes of all the paths with Cypher
On Wed, Nov 30, 2011 at 9:13 AM, Michael Hunger michael.hun...@neotechnology.com wrote: what about start c=node(1) match path = c-[*]-n return NODES(path) Ouch... This is probably a rather slow query. It starts from 'c' and goes all the way out to the end of the graph for, for every path connected from c. And that could be a LOT of paths. I don't think this is what dnagir was looking for :) Andrés ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] RETURN DISTINCT with ORDER BY
On Wed, Nov 30, 2011 at 6:27 AM, dnagir dna...@gmail.com wrote: But the query with both DISTINCT and ORDER BY doesn't return anything: There was a bug concerning distinct and order by in the same query that has been solved now. It was fixed in the stable 1.5 release. My suggestion is that you upgrade to that and report if you still have problems. Andrés ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] RETURN DISTINCT with ORDER BY
Thanks. This does work indeed. Much like in SQL :) On 30/11/2011, at 6:37 PM, readic [via Neo4j Community Discussions] wrote: try this: start d=node(17) match d-[*0..99]-x return distinct x,x.name order by x.name If you reply to this email, your message will be added to the discussion below: http://neo4j-community-discussions.438527.n3.nabble.com/RETURN-DISTINCT-with-ORDER-BY-tp3547366p3547551.html To unsubscribe from RETURN DISTINCT with ORDER BY, click here. NAML -- View this message in context: http://neo4j-community-discussions.438527.n3.nabble.com/RETURN-DISTINCT-with-ORDER-BY-tp3547366p3547899.html Sent from the Neo4j Community Discussions mailing list archive at Nabble.com. ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] How to return the start nodes of all the paths with Cypher
On Wed, Nov 30, 2011 at 11:32 AM, dnagir dna...@gmail.com wrote: I would probably like to write something among these lines (it's not valid query of course): START s=node(10) MATCH p = s-[:whatever]-t RETURN t, LENGTH(p) as len HAVING len = MAX( LENGTH(p) ) Well, this query would also return 'b' in the example you shared above. I think we need something that says follow this path until you can't follow it any more. If you're working with a B-tree, you should be able to say given this sub-root, give me all leafs. Something like: START c = node(17) MATCH x-[*END]-c RETURN x I really don't like this syntax, but I think the information belongs in there somewhere... Seems like clause similar to SQL HAVING is missing. It doesn't exactly reflect what I want but just thought from top of my head. So currently I have to use other query language if I want to do this. Right? A traversal would do it pretty simply. Maybe someone else can share a end-of-graph traversal example? I'm sure Gremlin can do it as well. Don't know how to do it in Gremlin though - Peter, Marko? Andrés ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] How to return the start nodes of all the paths with Cypher
On 30/11/2011, at 9:46 PM, Andres Taylor [via Neo4j Community Discussions] wrote: Well, this query would also return 'b' in the example you shared above. You're right. Too late here already. Can't think clearly. I think we need something that says follow this path until you can't follow it any more. If you're working with a B-tree, you should be able to say given this sub-root, give me all leafs. I don't need all leaves. It's a bit the other way around. I need the root of the tree. Something like: START c = node(17) MATCH x-[*END]-c RETURN x I really don't like this syntax, but I think the information belongs in there somewhere... I actually don't mind this syntax. It's looks like the right place and clearly shows the intent. -- View this message in context: http://neo4j-community-discussions.438527.n3.nabble.com/How-to-return-the-start-nodes-of-all-the-paths-with-Cypher-tp3547480p3547928.html Sent from the Neo4j Community Discussions mailing list archive at Nabble.com. ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] Id capacity exceeded
Alfredas, AFAIK there is a limit on the number of Relationship types is max 32000 in the cache layer, a bit higher in the storage layer. Mattias has been doing a branch for more in order to support Rene Pickhard in his Activity Stream algo that uses types heavily, see http://www.rene-pickhardt.de/data-structure-for-social-news-streams-on-graph-data-bases/ but that is not in master. So, I think a property on the relationships is a better way to go right now. Also updated the docs to reflect this, see https://github.com/neo4j/manual/commit/796ef8d2e3bf99df7410f53e37860296e6b616c6 Cheers, /peter neubauer GTalk: neubauer.peter Skype peter.neubauer Phone +46 704 106975 LinkedIn http://www.linkedin.com/in/neubauer Twitter http://twitter.com/peterneubauer brew install neo4j neo4j start heroku addons:add neo4j On Tue, Nov 29, 2011 at 6:58 PM, Alfredas Chmieliauskas alfredas...@gmail.com wrote: Dear all, after creating some relations i get the error org.neo4j.kernel.impl.nioneo.store.UnderlyingStorageException: Id capacity exceeded See trace below. I have to create around 1m relations. Out of those there are 100'000 different types of relations. Probably the number of relation types this is the cause of the problem. Alternatively I could create 1 type of relation but add a property to identify them. I just want to be sure about the cause of the error and if there are any configurable ways to get around it... Alfredas org.neo4j.kernel.impl.nioneo.store.UnderlyingStorageException: Id capacity exceeded at org.neo4j.kernel.impl.nioneo.store.IdGeneratorImpl.assertIdWithinCapacity(IdGeneratorImpl.java:170) at org.neo4j.kernel.impl.nioneo.store.IdGeneratorImpl.nextId(IdGeneratorImpl.java:161) at org.neo4j.kernel.impl.nioneo.store.CommonAbstractStore.nextId(CommonAbstractStore.java:393) at org.neo4j.kernel.impl.nioneo.xa.NeoStoreXaDataSource.nextId(NeoStoreXaDataSource.java:428) at org.neo4j.kernel.impl.nioneo.xa.NioNeoDbPersistenceSource.nextId(NioNeoDbPersistenceSource.java:111) at org.neo4j.kernel.impl.persistence.IdGenerator.nextId(IdGenerator.java:43) at org.neo4j.kernel.impl.core.DefaultRelationshipTypeCreator$RelTypeCreater.run(DefaultRelationshipTypeCreator.java:98) org.neo4j.graphdb.TransactionFailureException: Unable to create relationship type 4791005 at org.neo4j.kernel.impl.core.DefaultRelationshipTypeCreator.getOrCreate(DefaultRelationshipTypeCreator.java:58) at org.neo4j.kernel.impl.core.RelationshipTypeHolder.createRelationshipType(RelationshipTypeHolder.java:142) at org.neo4j.kernel.impl.core.RelationshipTypeHolder.addValidRelationshipType(RelationshipTypeHolder.java:81) at org.neo4j.kernel.impl.core.NodeManager.createRelationship(NodeManager.java:289) at org.neo4j.kernel.impl.core.NodeImpl.createRelationshipTo(NodeImpl.java:495) at org.neo4j.kernel.impl.core.NodeProxy.createRelationshipTo(NodeProxy.java:197) ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] How to return the start nodes of all the paths with Cypher
Well, in Gremlin, it is basically scripting, so you would probably do a loop and follow the pattern until you are at the right depth, see http://docs.neo4j.org/chunked/snapshot/gremlin-plugin.html#rest-api-flow-algorithms-with-gremlin for a flow algo that loops until the target node = sink, without any hard limitation. Cheers, /peter neubauer GTalk: neubauer.peter Skype peter.neubauer Phone +46 704 106975 LinkedIn http://www.linkedin.com/in/neubauer Twitter http://twitter.com/peterneubauer brew install neo4j neo4j start heroku addons:add neo4j On Wed, Nov 30, 2011 at 11:46 AM, Andres Taylor andres.tay...@neotechnology.com wrote: On Wed, Nov 30, 2011 at 11:32 AM, dnagir dna...@gmail.com wrote: I would probably like to write something among these lines (it's not valid query of course): START s=node(10) MATCH p = s-[:whatever]-t RETURN t, LENGTH(p) as len HAVING len = MAX( LENGTH(p) ) Well, this query would also return 'b' in the example you shared above. I think we need something that says follow this path until you can't follow it any more. If you're working with a B-tree, you should be able to say given this sub-root, give me all leafs. Something like: START c = node(17) MATCH x-[*END]-c RETURN x I really don't like this syntax, but I think the information belongs in there somewhere... Seems like clause similar to SQL HAVING is missing. It doesn't exactly reflect what I want but just thought from top of my head. So currently I have to use other query language if I want to do this. Right? A traversal would do it pretty simply. Maybe someone else can share a end-of-graph traversal example? I'm sure Gremlin can do it as well. Don't know how to do it in Gremlin though - Peter, Marko? Andrés ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
[Neo4j] Moving to u...@neo4j.org
Hi all, we are going to move from mailman to google groups, http://groups.google.com/a/neo4j.org/groups/dir soon, I just wanted to give you a heads-up that I will invite add of the current members to http://groups.google.com/a/neo4j.org/group/user/topics?lnk when we are ready. Just wanted to warn you that there might be a surprising welcome message from that group soonish, hope you don't mind! Let me know if you have any objections. Happy hacking! /peter neubauer GTalk: neubauer.peter Skype peter.neubauer Phone +46 704 106975 LinkedIn http://www.linkedin.com/in/neubauer Twitter http://twitter.com/peterneubauer brew install neo4j neo4j start heroku addons:add neo4j ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
[Neo4j] Named matched with depth gives error
Hi, I am trying this query: *START u=node(5963) MATCH p = (u)-[r:selling*1..99]-() WHERE r.development=7867 RETURN p* But it gives the error: Error: *NoSuchElementException - key not found: r* When I remove the depth specification (*1..99) from the MATCH, it works as expected. What's a deal with it? Thanks, Dmytrii. -- View this message in context: http://neo4j-community-discussions.438527.n3.nabble.com/Named-matched-with-depth-gives-error-tp3548195p3548195.html Sent from the Neo4j Community Discussions mailing list archive at Nabble.com. ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] Moving to u...@neo4j.org
Good decision. Immediately signed up. From: peter.neuba...@neotechnology.com Date: Wed, 30 Nov 2011 13:55:44 +0100 To: user@lists.neo4j.org Subject: [Neo4j] Moving to u...@neo4j.org Hi all, we are going to move from mailman to google groups, http://groups.google.com/a/neo4j.org/groups/dir soon, I just wanted to give you a heads-up that I will invite add of the current members to http://groups.google.com/a/neo4j.org/group/user/topics?lnk when we are ready. Just wanted to warn you that there might be a surprising welcome message from that group soonish, hope you don't mind! Let me know if you have any objections. Happy hacking! /peter neubauer GTalk: neubauer.peter Skype peter.neubauer Phone +46 704 106975 LinkedIn http://www.linkedin.com/in/neubauer Twitter http://twitter.com/peterneubauer brew install neo4j neo4j start heroku addons:add neo4j ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] Neo4j Spatial build / run problems
Hi Peter,
the tests are running and now I get the following results:
cypher start n=node:geom('bbox:[9.9996186, 9.9996186, 48.4027913,
48.4027913]')
cypher return n
cypher
== +--+
== | n|
== +--+
== | Node[205373]{vertices-1,bbox-[D@4613e058,gtype-1} |
== +--+
== 1 rows, 194 ms
http POST /db/data/ext/SpatialPlugin/graphdb/findGeometriesInLayer
{layer:geom,minx:9.9996186,maxx:9.9996186,miny:48.4027913,maxy:48.4027913}
== 200 OK
== [ {
== outgoing_relationships :
http://localhost:7474/db/data/node/205373/relationships/out;,
== data : {
== bbox : [ 9.9996186, 9.9996186, 48.4027913, 48.4027913 ],
== vertices : 1,
== gtype : 1
== },
== traverse :
http://localhost:7474/db/data/node/205373/traverse/{returnType};,
== all_typed_relationships :
http://localhost:7474/db/data/node/205373/relationships/all/{-list||types},
== property :
http://localhost:7474/db/data/node/205373/properties/{key};,
== self : http://localhost:7474/db/data/node/205373;,
== properties : http://localhost:7474/db/data/node/205373/properties;,
== outgoing_typed_relationships :
http://localhost:7474/db/data/node/205373/relationships/out/{-list||types},
== incoming_relationships :
http://localhost:7474/db/data/node/205373/relationships/in;,
== extensions : {
== },
== create_relationship :
http://localhost:7474/db/data/node/205373/relationships;,
== paged_traverse :
http://localhost:7474/db/data/node/205373/paged/traverse/{returnType}{?pageSize,leaseTime};,
== all_relationships :
http://localhost:7474/db/data/node/205373/relationships/all;,
== incoming_typed_relationships :
http://localhost:7474/db/data/node/205373/relationships/in/{-list||types}
== } ]
To get to this point I have to follow exactly the following steps:
1. Create a new database
2. Run the OSMImporter and name the layer 'geom' (Cypher don't like \ / :)
- separate osmPath and Layername in importer
3. Start the server and call the following through HTTP:
http POST /db/data/ext/SpatialPlugin/graphdb/addSimplePointLayer
{layer:geom, lat:lat, lon:lon}
== 200 OK
== [ {
== outgoing_relationships :
http://localhost:7474/db/data/node/582567/relationships/out;,
== data : {
== layer_class : org.neo4j.gis.spatial.osm.OSMLayer,
== layerprops : [ FIXME, TMC:cid_58:tabcd_1:Class,
TMC:cid_58:tabcd_1:Direction, TMC:cid_58:tabcd_1:LCLversion,
TMC:cid_58:tabcd_1:LocationCode, TMC:cid_58:tabcd_1:NextLocationCode,
TMC:cid_58:tabcd_1:PrevLocationCode, access, addr:city,
addr:country, addr:housenumber, addr:postcode, addr:state,
addr:street, admin_level, agricultural, alt_name, amenity, area,
asb, atm, backrest, barrier, bell, bench, bicycle,
bicycle_parking, boundary, brand, bridge, building,
building:cladding, building:height, building:levels, building:roof,
building:type, building:use, bus, cables, capacity,
capacity:disabled, class:bicycle, collection_times, covered,
created_by, crossing, crossing_ref, cuisine, cutting, cycleway,
denomination, denotation, description, destination, detail,
direction, ele, electrified, email, emergency, fax, fee,
fixme, foot, frequency, from, gauge, grade, hgv, highway,
historic, history, horse, hour_off, hour_on, incline, int_ref,
is_in, junction, landuse, lanes, layer, leisure, light, lit,
man_made, material, maxheight, maxspeed, maxspeed:source,
maxweight, moped, motor_vehicle, motorcar, motorcycle,
motorroad, mtb:scale, name, natural, network, noexit, note,
note:de, office, oneway, onkz, openGeoDB:auto_update,
openGeoDB:community_identification_number, openGeoDB:is_in,
openGeoDB:is_in_loc_id, openGeoDB:layer, openGeoDB:license_plate_code,
openGeoDB:loc_id, openGeoDB:name, openGeoDB:sort_name,
openGeoDB:version, opening_hours, operator, park_ride, parking,
payment:coins, payment:telephone_cards, phone, place, postal_code,
power, power:type, priority, psv, public_transport, rail,
railway, recycling:clothes, recycling:glass, recycling:paper, ref,
ref:color, religion, restriction, route, sac_scale, segregated,
service, shelter, shop, smoking, smoothness, source,
source:lit, source:maxspeed, sport, surface, tactile_paving, to,
tourism, tracks, tracktype, traffic_sign, trail_visibility,
tram, tunnel, type, usability:skate, vehicle, vending,
voltage, waterway, website, wheelchair, wheelchair:description,
width, wikipedia, wires, wood, workrules, wpt_description ],
== layer : geom,
== geomencoder : org.neo4j.gis.spatial.osm.OSMGeometryEncoder,
== ctime : 1322660287742
== },
== traverse :
http://localhost:7474/db/data/node/582567/traverse/{returnType};,
== all_typed_relationships :
http://localhost:7474/db/data/node/582567/relationships/all/{-list||types},
== property :
http://localhost:7474/db/data/node/582567/properties/{key};,
== self : http://localhost:7474/db/data/node/582567;,
Re: [Neo4j] Neo4j Spatial build / run problems
Daniel, glad to hear it works out! I think we need to make the loading of the index more robust, so the order is less important. Feel free to suggest improvements on that, and make some more tests for it. Also, keep us informed on how your project is going. Maybe a small blog is in order to show off? Cheers, /peter neubauer GTalk: neubauer.peter Skype peter.neubauer Phone +46 704 106975 LinkedIn http://www.linkedin.com/in/neubauer Twitter http://twitter.com/peterneubauer brew install neo4j neo4j start heroku addons:add neo4j On Wed, Nov 30, 2011 at 3:04 PM, danielb danielbercht...@gmail.com wrote: Now I missed another important point: With that settings the database would still not return any results. I changed the bounding box values to 9.9 and 48.4. I then got an error message with insufficient heap space. With more digits it would load even more from the R-tree. I increased the cache sizes from the standard few megabytes to several hundreds of megabytes and now can do the queries. (600k nodes, 1M properties, 1M relationships) -- View this message in context: http://neo4j-community-discussions.438527.n3.nabble.com/Neo4j-Spatial-build-run-problems-tp3515519p3548384.html Sent from the Neo4j Community Discussions mailing list archive at Nabble.com. ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] Using in-memory DB for unit tests
Oh man do I feel stupid - thank you both. The IMDB tutorial was so good I
created a project without fully reading the API docs.
Regards,
Jon
On Tue, Nov 29, 2011 at 10:54 PM, Michael Hunger
michael.hun...@neotechnology.com wrote:
you can also use
rel.getOtherNode(startNode)
Michael
mobile mail please excuse brevity and typos
Am 30.11.2011 um 06:03 schrieb Jim Webber j...@neotechnology.com:
Hi Jon,
// This one results in a not found exception on the 'asn' property.
@Test
public void testIncoming()
{
Node network = svc.createNode();
Node as = svc.createNode();
as.setProperty( asn, 123 );
as.createRelationshipTo( network,
DynamicRelationshipType.withName( AS ) );
System.out.println( network.getSingleRelationship(
IPAddressRelationshipType.AS, Direction.INCOMING )
.getStartNode()
// It's the start node of the incoming relationship,
which is the same as the end node of the outgoing relationship
.getProperty( asn ) );
}
You got the start and end node wrong - I changed that and your test ran
just fine.
Good luck with your first project - I hope it's as enjoyable as my first
Neo4j project :-)
Jim
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[Neo4j] Neo4j Tutorial
Hello geeks, I would like if possible that somebody walks me through a complete tutorial on Neo4j. I am a newbie of Noe4j and I have read some stuffs on the wiki web page but still I have not caught yet the procedure. I just need a simple scenario and a step-by-step guide to implement the scenario. I know that it may sound weird but I would like to have an aid because I will be building an app using the Neo4j. Thank you guys, -- View this message in context: http://neo4j-community-discussions.438527.n3.nabble.com/Neo4j-Tutorial-tp3548519p3548519.html Sent from the Neo4j Community Discussions mailing list archive at Nabble.com. ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] Neo4j Tutorial
If you are interested in one-on-one help, take a look at the neo4j events calendar. Joining a local meetup or a webinar could be a good route to go. Such Neo4j events are listed here: http://plancast.com/neo4j Also, take a look at the neo4j koans, a set of unit tests that walk you through how to work with the neo4j java API: https://github.com/jimwebber/neo4j-tutorial/ Cheers! /jake On Wed, Nov 30, 2011 at 3:42 PM, bigToch arsene.toche...@corenett.comwrote: Hello geeks, I would like if possible that somebody walks me through a complete tutorial on Neo4j. I am a newbie of Noe4j and I have read some stuffs on the wiki web page but still I have not caught yet the procedure. I just need a simple scenario and a step-by-step guide to implement the scenario. I know that it may sound weird but I would like to have an aid because I will be building an app using the Neo4j. Thank you guys, -- View this message in context: http://neo4j-community-discussions.438527.n3.nabble.com/Neo4j-Tutorial-tp3548519p3548519.html Sent from the Neo4j Community Discussions mailing list archive at Nabble.com. ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user -- Jacob Hansson Phone: +46 (0) 763503395 Twitter: @jakewins ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] New Bug Logged - Gremlin 114
Hi,
Please put this into the Gremlin issue tracker.
https://github.com/tinkerpop/gremlin/issues
The table is not intended to be ordered with the location of the named as
steps. It was just not engineered that way. However, others have brought this
up. I suspect for Gremlin 1.5 (Gremlin 1.4 is being released soon), we can have
the behavior ordered.
Thanks Romiko and Peter,
Marko.
http://markorodriguez.com
On Nov 30, 2011, at 1:20 AM, Peter Neubauer wrote:
Thanks Romiko,
will look into it first time when I have time. How critical is it for you?
Cheers,
/peter neubauer
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On Wed, Nov 30, 2011 at 1:31 AM, Romiko Derbynew
romiko.derby...@readify.net wrote:
Hi,
New bugged logged at: https://github.com/neo4j/community/issues/114
Details below for others to peruse.
Gremlin Table Projections - Column Order Incorrect when using chained
.As('x').As('y')
EXPECTED Order: Createdy, ReferralGroup, ReferralId, ReferralData
When AS statements appear next to each other.
Consider A (WORKS - But not logical - have to reverse order when more than 1
AS statement is chained together right after each other for column array to
match):
{script:g.v(0).outE[[label:'HOSTS']].inV.filter{ it.Key == 'romikoagency'
}.inE[[label:'USER_BELONGS_TO']].outV.filter{ it.Username ==
'romiko.derbynew'
}.as('CreatedBy').outE[[label:'USER_LINKED_TO_PROGRAM']].inV.as('ReferralGroup').inE[[label:'HAS_SUGGESTED_PROGRAM']].outV.inE[[label:'REFERRAL_HAS_DECISIONS_SECTION']].outV.as('ReferralDate').as('ReferralId').table(new
Table()){it.Username}{it.Name}{it.UniqueId}{it.DateInitiatedUtc}.cap
}
notice: as('ReferralDate').as('ReferralId') and then notice the column order
below is opposite this: columns ReferralId, ReferralDate ]
Results
[ [ {
data : [ [ romiko.derbynew, Testa, 331, /Date(1322007153048+1100)/
], [ romiko.derbynew, Testa, 321, /Date(1322003375637+1100)/ ]],
columns : [ CreatedBy, ReferralGroup, ReferralId, ReferralDate ]
} ] ]
Consider B (Does not work - this is more LOGICAL from gremlin perspective
but is bugged, the Chained AS right after each other gets reversed in the
column array.)
{script:g.v(0).outE[[label:'HOSTS']].inV.filter{ it.Key == 'romikoagency'
}.inE[[label:'USER_BELONGS_TO']].outV.filter{ it.Username ==
'romiko.derbynew'
}.as('CreatedBy').outE[[label:'USER_LINKED_TO_PROGRAM']].inV.as('ReferralGroup').inE[[label:'HAS_SUGGESTED_PROGRAM']].outV.inE[[label:'REFERRAL_HAS_DECISIONS_SECTION']].outV.as('ReferralId').as('ReferralDate').table(new
Table()){it.Username}{it.Name}{it.UniqueId}{it.DateInitiatedUtc}.cap
}
Notice: .as('ReferralId').as('ReferralDate') and then the columns columns
ReferralDate, ReferralId ]
Results
[ [ {
data : [ [ romiko.derbynew, Testa, 331, /Date(1322007153048+1100)/
]],
columns : [ CreatedBy, ReferralGroup, ReferralDate, ReferralId ]
} ] ]
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Re: [Neo4j] New Bug Logged - Gremlin 114
Hi,
Actually, I know how to solve your problem. See below.
g.v(0).outE[[label:'HOSTS']].inV.filter{ it.Key == 'romikoagency'
}.inE[[label:'USER_BELONGS_TO']].outV.filter{ it.Username ==
'romiko.derbynew'
}.as('CreatedBy').outE[[label:'USER_LINKED_TO_PROGRAM']].inV.as('ReferralGroup').inE[[label:'HAS_SUGGESTED_PROGRAM']].outV.inE[[label:'REFERRAL_HAS_DECISIONS_SECTION']].outV.as('ReferralId').as('ReferralDate').table(new
Table()){it.Username}{it.Name}{it.UniqueId}{it.DateInitiatedUtc}.cap
You can not do two as() steps in a row. Do a toString() on your Pipeline
representation (e.g. cap.toString()). You will notice that your first as()
step is wrapped by the second one. To rectify this, insert an identity. For
example: as('ReferralId')._.as('ReferralDate').
Also, here are some optimizations to your expression that you might want to
consider. The first and the third are to make it easier on the eyes (and a bit
faster as well). The second is to make it faster.
outE[[label:'HOSTS']].inV ---turn into--
out('HOSTS')
filter{it.Key == 'romikoagency'}---turn into--
filter{it.getProperty('Key') == 'romikoagency'}
inE[[label:'USER_BELONGS_TO']].outV ---turn into--
in('USER_BELONGS_TO')
See: https://github.com/tinkerpop/gremlin/wiki/Gremlin-Groovy-Path-Optimizations
Enjoy!,
Marko.
http://markorodriguez.com
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[Neo4j] Cypher Query Optimizing
Hey, I'm currently converting some SQL Queries to Cypher and I'm very happy to see what is possible with the language. I was wondering if the following query can be optimized, it selects the edges between neighbours of a given node (137) who also know each other: SQL: select w1.w1_id,w1.w2_id,w1.freq,w1.sig from co_s w1 where w1.w1_id in (select w2.w2_id from co_s w2 where w2.w1_id=137) and w1.w2_id in (select w3.w2_id from co_s w3 where w3.w1_id=137); Cypher: START n=node:words(w_id = 137) MATCH n-[:CO_S]-m, n-[:CO_S]- t, m-[r:CO_S]- t return m.w_id, t.w_id, r.sig, r.freq The results are the same, but the Cypher Query is about 10 times slower than the SQL pendant. I currently do not use any additional indices. Just a map (words) between my word ID and the neo4j node id. Thx for your help! Great work! Rock on! Martin (@kc1s) ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] Cypher Query Optimizing
Cypher: START n=node:words(w_id = 137) MATCH n-[:CO_S]-m, n-[:CO_S]- t, m-[r:CO_S]- t return m.w_id, t.w_id, r.sig, r.freq The results are the same, but the Cypher Query is about 10 times slower than the SQL pendant. I currently do not use any additional indices. Just a map (words) between my word ID and the neo4j node id. Doing index lookups is much slower than node lookups. In the application I'm developing, we've removed most index lookups and replaced them with node lookups. We keep a keyword to nodeId mapping in a key/value store and lookup the nodeId before running any Cypher queries. In your case: START n=node(1) MATCH n-[:CO_S]-m, n-[:CO_S]- t, m-[r:CO_S]- t return m.w_id, t.w_id, r.sig, r.freq (where 1 is the corresponding nodeId to w_id = 137) If I understood your email correctly, you already have that map available to you (137 - 1). I'd use that to see if it's any quicker. Your mileage may vary, of course. In our application the speed improvements were roughly 10x. See my post on the mailing list with subject: Comparing Lucene index lookup performance to lookup by node id -TPP ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
[Neo4j] social network may exceed the number of nodes / relationships / properties
Hi peoples, I need to do in a social network the same of facebook does into a private messages and post's. However, I have the following concern: It is expected up to 1 million users in the social network, if each person to write one million times (between posts and private messages) in one year. My fear is exceeding the number of properties / relationships / nodes How would you do in this situation? what do you recommend? -- View this message in context: http://neo4j-community-discussions.438527.n3.nabble.com/social-network-may-exceed-the-number-of-nodes-relationships-properties-tp3549025p3549025.html Sent from the Neo4j Community Discussions mailing list archive at Nabble.com. ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] Cypher Query Optimizing
@Tero @Krzysztof thx for your fast replies. @Krzysztof for me it was not fairly well known. I will also check out the traverser api. @Tero I tried the same query using the internal id instead of my mapping index (lucene) orig: START n=node:words(w_id = '137') MATCH n-[:CO_S]-m, n-[:CO_S]- t, m-[r:CO_S]- t return m.w_id, t.w_id, r.sig, r.freq took: 662ms (average of 100 runs after 10 warmups) new: START n=node(119) MATCH n-[:CO_S]-m, n-[:CO_S]- t, m-[r:CO_S]- t return m.w_id, t.w_id, r.sig, r.freq took: 644ms (average of 100 runs after 10 warmups) So it doesn't seem to be much more faster not using the index for node lookup. I will check out your posts concerning Lucene Index. Greetings, Martin Am 30.11.2011 18:08, schrieb Krzysztof Raczyński: It is fairly well known that cypher queries are not (yet) optimised. If speed is a concern for you, try using traversal API, i can confirm it is much faster than cypher. cheers ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] Id capacity exceeded
Thanks Peter. I got it to work with relationship properties. I am pretty sure that the number of different relationships I was trying to create was less than 32K. Maybe its a good idea to test that limit.. A On Wed, Nov 30, 2011 at 11:52 AM, Peter Neubauer peter.neuba...@neotechnology.com wrote: Alfredas, AFAIK there is a limit on the number of Relationship types is max 32000 in the cache layer, a bit higher in the storage layer. Mattias has been doing a branch for more in order to support Rene Pickhard in his Activity Stream algo that uses types heavily, see http://www.rene-pickhardt.de/data-structure-for-social-news-streams-on-graph-data-bases/ but that is not in master. So, I think a property on the relationships is a better way to go right now. Also updated the docs to reflect this, see https://github.com/neo4j/manual/commit/796ef8d2e3bf99df7410f53e37860296e6b616c6 Cheers, /peter neubauer GTalk: neubauer.peter Skype peter.neubauer Phone +46 704 106975 LinkedIn http://www.linkedin.com/in/neubauer Twitter http://twitter.com/peterneubauer brew install neo4j neo4j start heroku addons:add neo4j On Tue, Nov 29, 2011 at 6:58 PM, Alfredas Chmieliauskas alfredas...@gmail.com wrote: Dear all, after creating some relations i get the error org.neo4j.kernel.impl.nioneo.store.UnderlyingStorageException: Id capacity exceeded See trace below. I have to create around 1m relations. Out of those there are 100'000 different types of relations. Probably the number of relation types this is the cause of the problem. Alternatively I could create 1 type of relation but add a property to identify them. I just want to be sure about the cause of the error and if there are any configurable ways to get around it... Alfredas org.neo4j.kernel.impl.nioneo.store.UnderlyingStorageException: Id capacity exceeded at org.neo4j.kernel.impl.nioneo.store.IdGeneratorImpl.assertIdWithinCapacity(IdGeneratorImpl.java:170) at org.neo4j.kernel.impl.nioneo.store.IdGeneratorImpl.nextId(IdGeneratorImpl.java:161) at org.neo4j.kernel.impl.nioneo.store.CommonAbstractStore.nextId(CommonAbstractStore.java:393) at org.neo4j.kernel.impl.nioneo.xa.NeoStoreXaDataSource.nextId(NeoStoreXaDataSource.java:428) at org.neo4j.kernel.impl.nioneo.xa.NioNeoDbPersistenceSource.nextId(NioNeoDbPersistenceSource.java:111) at org.neo4j.kernel.impl.persistence.IdGenerator.nextId(IdGenerator.java:43) at org.neo4j.kernel.impl.core.DefaultRelationshipTypeCreator$RelTypeCreater.run(DefaultRelationshipTypeCreator.java:98) org.neo4j.graphdb.TransactionFailureException: Unable to create relationship type 4791005 at org.neo4j.kernel.impl.core.DefaultRelationshipTypeCreator.getOrCreate(DefaultRelationshipTypeCreator.java:58) at org.neo4j.kernel.impl.core.RelationshipTypeHolder.createRelationshipType(RelationshipTypeHolder.java:142) at org.neo4j.kernel.impl.core.RelationshipTypeHolder.addValidRelationshipType(RelationshipTypeHolder.java:81) at org.neo4j.kernel.impl.core.NodeManager.createRelationship(NodeManager.java:289) at org.neo4j.kernel.impl.core.NodeImpl.createRelationshipTo(NodeImpl.java:495) at org.neo4j.kernel.impl.core.NodeProxy.createRelationshipTo(NodeProxy.java:197) ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
[Neo4j] Spring integration problem
Hi, I would like to use the Spring integration feature described on the springdataNeo4j page. My project already uses both Spring and Maven, and I am familiar with how to set up dependencies and Spring beans. I already have the neo4j server running on my localhost and I've been able to test it via the browser interface, so I know that part works. Unfortunately, despite carefully following the tutorial's instructions, and carefully examining everything I'm doing including making sure that every possible dependency is declared correctly, I cannot get Spring to load the graph database service due to an exception Invalid NamespaceHandler class. This is my Spring configuration file: ?xml version=1.0 encoding=UTF-8? beans xmlns=http://www.springframework.org/schema/beans; xmlns:xsi=http://www.w3.org/2001/XMLSchema-instance; xmlns:neo4j=http://www.springframework.org/schema/data/neo4j; xsi:schemaLocation=http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/data/neo4j http://www.springframework.org/schema/data/neo4j/spring-neo4j-2.0.xsd; neo4j:config graphDatabaseService=graphDatabaseService/ bean id=graphDatabaseService class=org.springframework.data.neo4j.rest.SpringRestGraphDatabase constructor-arg value=http://localhost:7474/db/data// /bean /beans This is the full stack trace of the exception: 11/30/2011 13:07:34 [INFO] main (XmlBeanDefinitionReader.java:315) - Loading XML bean definitions from class path resource [neo4j.xml] org.springframework.beans.factory.BeanDefinitionStoreException: Unexpected exception parsing XML document from class path resource [neo4j.xml]; nested exception is org.springframework.beans.FatalBeanException: Invalid NamespaceHandler class [org.springframework.data.neo4j.config.DataGraphNamespaceHandler] for namespace [http://www.springframework.org/schema/data/neo4j]: problem with handler class file or dependent class; nested exception is java.lang.NoClassDefFoundError: org/springframework/beans/factory/xml/NamespaceHandlerSupport at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:412) at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:334) at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:302) at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:143) at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:178) at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:149) at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:212) at org.springframework.context.support.AbstractXmlApplicationContext.loadBeanDefinitions(AbstractXmlApplicationContext.java:126) at org.springframework.context.support.AbstractXmlApplicationContext.loadBeanDefinitions(AbstractXmlApplicationContext.java:92) at org.springframework.context.support.AbstractRefreshableApplicationContext.refreshBeanFactory(AbstractRefreshableApplicationContext.java:130) at org.springframework.context.support.AbstractApplicationContext.obtainFreshBeanFactory(AbstractApplicationContext.java:467) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:397) at org.springframework.context.support.ClassPathXmlApplicationContext.init(ClassPathXmlApplicationContext.java:139) at org.springframework.context.support.ClassPathXmlApplicationContext.init(ClassPathXmlApplicationContext.java:93) at neo4j.Populate.init(Populate.java:32) at neo4j.Populate.main(Populate.java:18) Caused by: org.springframework.beans.FatalBeanException: Invalid NamespaceHandler class [org.springframework.data.neo4j.config.DataGraphNamespaceHandler] for namespace [http://www.springframework.org/schema/data/neo4j]: problem with handler class file or dependent class; nested exception is java.lang.NoClassDefFoundError: org/springframework/beans/factory/xml/NamespaceHandlerSupport at org.springframework.beans.factory.xml.DefaultNamespaceHandlerResolver.resolve(DefaultNamespaceHandlerResolver.java:139) at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.parseCustomElement(BeanDefinitionParserDelegate.java:1333) at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.parseCustomElement(BeanDefinitionParserDelegate.java:1328) at
Re: [Neo4j] New Bug Logged - Gremlin 114
Not too bad, I have a work around in our fluent api to reverse them.
-Original Message-
From: user-boun...@lists.neo4j.org [mailto:user-boun...@lists.neo4j.org] On
Behalf Of Peter Neubauer
Sent: Wednesday, 30 November 2011 7:20 PM
To: Neo4j user discussions
Cc: mystory-develop...@barnardos.org.au
Subject: Re: [Neo4j] New Bug Logged - Gremlin 114
Thanks Romiko,
will look into it first time when I have time. How critical is it for you?
Cheers,
/peter neubauer
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Skype peter.neubauer
Phone +46 704 106975
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brew install neo4j neo4j start
heroku addons:add neo4j
On Wed, Nov 30, 2011 at 1:31 AM, Romiko Derbynew romiko.derby...@readify.net
wrote:
Hi,
New bugged logged at: https://github.com/neo4j/community/issues/114
Details below for others to peruse.
Gremlin Table Projections - Column Order Incorrect when using chained
.As('x').As('y')
EXPECTED Order: Createdy, ReferralGroup, ReferralId, ReferralData
When AS statements appear next to each other.
Consider A (WORKS - But not logical - have to reverse order when more than 1
AS statement is chained together right after each other for column array to
match):
{script:g.v(0).outE[[label:'HOSTS']].inV.filter{ it.Key == 'romikoagency'
}.inE[[label:'USER_BELONGS_TO']].outV.filter{ it.Username ==
'romiko.derbynew'
}.as('CreatedBy').outE[[label:'USER_LINKED_TO_PROGRAM']].inV.as('ReferralGroup').inE[[label:'HAS_SUGGESTED_PROGRAM']].outV.inE[[label:'REFERRAL_HAS_DECISIONS_SECTION']].outV.as('ReferralDate').as('ReferralId').table(new
Table()){it.Username}{it.Name}{it.UniqueId}{it.DateInitiatedUtc}.cap
}
notice: as('ReferralDate').as('ReferralId') and then notice the column
order below is opposite this: columns ReferralId,
ReferralDate ]
Results
[ [ {
data : [ [ romiko.derbynew, Testa, 331,
/Date(1322007153048+1100)/ ], [ romiko.derbynew, Testa, 321,
/Date(1322003375637+1100)/ ]], columns : [ CreatedBy,
ReferralGroup, ReferralId, ReferralDate ] } ] ]
Consider B (Does not work - this is more LOGICAL from gremlin
perspective but is bugged, the Chained AS right after each other gets
reversed in the column array.)
{script:g.v(0).outE[[label:'HOSTS']].inV.filter{ it.Key == 'romikoagency'
}.inE[[label:'USER_BELONGS_TO']].outV.filter{ it.Username ==
'romiko.derbynew'
}.as('CreatedBy').outE[[label:'USER_LINKED_TO_PROGRAM']].inV.as('ReferralGroup').inE[[label:'HAS_SUGGESTED_PROGRAM']].outV.inE[[label:'REFERRAL_HAS_DECISIONS_SECTION']].outV.as('ReferralId').as('ReferralDate').table(new
Table()){it.Username}{it.Name}{it.UniqueId}{it.DateInitiatedUtc}.cap
}
Notice: .as('ReferralId').as('ReferralDate') and then the columns
columns ReferralDate, ReferralId ]
Results
[ [ {
data : [ [ romiko.derbynew, Testa, 331,
/Date(1322007153048+1100)/ ]], columns : [ CreatedBy,
ReferralGroup, ReferralDate, ReferralId ] } ] ]
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[Neo4j] Persisting community information
Suppose I have a graph and I run a community detection algorithm on it. These algorithms usually return a dendrogram, representing the division of the graph from whole network to individual nodes. Does anyone have experience persisting these results? I suppose it could be stored as a separate graph, but is there a way to store it within the graph itself? Paul Jackson, Principal Software Engineer Pitney Bowes Business Insight 4200 Parliament Place | Suite 600 | Lanham, MD 20706-1844 USA O: 301.918.0850 | M: 703.862.0120 | www.pb.com paul.jack...@pb.com Every connection is a new opportunity(tm) Please consider the environment before printing or forwarding this email. If you do print this email, please recycle the paper. This email message may contain confidential, proprietary and/or privileged information. It is intended only for the use of the intended recipient(s). If you have received it in error, please immediately advise the sender by reply email and then delete this email message. Any disclosure, copying, distribution or use of the information contained in this email message to or by anyone other than the intended recipient is strictly prohibited. Any views expressed in this message are those of the individual sender, except where the sender specifically states them to be the views of the Company. ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] Persisting community information
I did something similar by storing my query as a property withing a new node and connecting the node with the result nodes. I also store additional contextual information in the connecting edges. Akhil On 11/30/2011 3:14 PM, Paul A. Jackson wrote: Suppose I have a graph and I run a community detection algorithm on it. These algorithms usually return a dendrogram, representing the division of the graph from whole network to individual nodes. Does anyone have experience persisting these results? I suppose it could be stored as a separate graph, but is there a way to store it within the graph itself? Paul Jackson, Principal Software Engineer Pitney Bowes Business Insight 4200 Parliament Place | Suite 600 | Lanham, MD 20706-1844 USA O: 301.918.0850 | M: 703.862.0120 | www.pb.com paul.jack...@pb.com Every connection is a new opportunity(tm) Please consider the environment before printing or forwarding this email. If you do print this email, please recycle the paper. This email message may contain confidential, proprietary and/or privileged information. It is intended only for the use of the intended recipient(s). If you have received it in error, please immediately advise the sender by reply email and then delete this email message. Any disclosure, copying, distribution or use of the information contained in this email message to or by anyone other than the intended recipient is strictly prohibited. Any views expressed in this message are those of the individual sender, except where the sender specifically states them to be the views of the Company. ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
[Neo4j] Using Neo4j as a document database (SO-Question)
Dear Graphistas, if you have experience with that topic, could you please answer him. I think, real world answers help more than my general ones. Thanks a lot Michael http://stackoverflow.com/questions/8332647/is-it-possible-to-use-graph-database-as-a-document-oriented-database Suppose I have a large ammount of heterogeneous JSON documents (i.e. named key-value mappings) and a hierarchy of classes (i.e. named sets) that these documents are attached to. I need to set up a data structure that will allow: • CRUD operations on JSON documents. • Retrieving JSON documents by ID really quickly. • Retrieving all JSON documents that are attached to a certain class really quickly. • Editing class hierarchy: adding/deleting classes, rearranging them. I've initially came up with the idea of storing JSON documents in a document-oriented database (like CouchDB or MongoDB) and storing class hierarchy in a graph database (like Neo4j). 1, 2 and 4 are then figured out naturally, and 3 solved by maintaining list of attached document IDs for every class in the graph. But then I figured that a graph database could actually do the document-oriented part of retrieving JSON documents by ID. At a first glance this seems true, but I'm still concerned about 2 and 3. Is there a graph database that is able to retrieve documents (nodes) at a speed document-oriented db's serve documents? How fast will it serve 3-like queries? I've heard a little bit about graph databases being slow, reification problem, etc. Is there a graph database that is also as comfortable for casual retrieving objects by ID, as CouchDB, for example? What is the difference between using document-oriented and graph database for storing, retrieving and editing JSON-like objects? ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
[Neo4j] NullPointerException in ExecutingRestRequest
The server is running on localhost and can be hit from a browser. The server's configuration was modified to allow requests from any IP address, although all of my attempts are from the localhost anyway. I've tried this with and without a trailing slash on the URI, no difference. Code: GraphDatabase graphDb = new SpringRestGraphDatabase(http://localhost:7474/db/data;); graphDb.getReferenceNode(); Result: java.lang.NullPointerException at org.neo4j.rest.graphdb.ExecutingRestRequest.uriWithoutSlash(ExecutingRestRequest.java:78) at org.neo4j.rest.graphdb.ExecutingRestRequest.init(ExecutingRestRequest.java:72) at org.neo4j.rest.graphdb.ExecutingRestRequest.with(ExecutingRestRequest.java:149) at org.neo4j.rest.graphdb.entity.RestEntity.init(RestEntity.java:52) at org.neo4j.rest.graphdb.entity.RestNode.init(RestNode.java:47) at org.neo4j.rest.graphdb.RestAPI.getReferenceNode(RestAPI.java:168) at org.neo4j.rest.graphdb.RestGraphDatabase.getReferenceNode(RestGraphDatabase.java:71) at neo4j.Populate.init(Populate.java:35) at neo4j.Populate.main(Populate.java:18) -- View this message in context: http://neo4j-community-discussions.438527.n3.nabble.com/NullPointerException-in-ExecutingRestRequest-tp3550067p3550067.html Sent from the Neo4j Community Discussions mailing list archive at Nabble.com. ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] Cypher Query Optimizing
START n=node(119) MATCH n-[:CO_S]-m, n-[:CO_S]- t, m-[r:CO_S]- t return m.w_id, t.w_id, r.sig, r.freq took: 644ms (average of 100 runs after 10 warmups) Can you try using shortestPath cypher function for m-t ? ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
[Neo4j] WADL specification is the complete reference for all HTTP interactions with Neo4j?
I have noticed that you provide a runtime generated WADL specification for the HTTP API. I'm going to create a WADL to Node.js SDK converter so I don't have to create the functionality and change things manually each time you have a new release with changes to the HTTP API. a But before I do that I wanna be sure that this WADL specification is always an _up to date_ spec for _all_ HTTP interactions. Could someone confirm this? -- View this message in context: http://neo4j-community-discussions.438527.n3.nabble.com/WADL-specification-is-the-complete-reference-for-all-HTTP-interactions-with-Neo4j-tp3550226p3550226.html Sent from the Neo4j Community Discussions mailing list archive at Nabble.com. ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] py2neo - GEOFF enhancements
Peter: I am happy with the current state of the neo4j-geoff code so feel it
should be stable enough to adopt when you wish to do so. I have also made a
couple of recent updates to the documentation, most notably the GEOFF.md
file.
Cheers
Nige
*Nigel Small*
Phone: +44 7814 638 246
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On 29 November 2011 23:33, Michael Hunger
michael.hun...@neotechnology.comwrote:
#1 Thanks
#2 You're probably right
#3 You can do the index lookup outside and pass in the IndexHitsNode as
being and Iterator
#3 I rather thought of {name} for |people| - {name: {hook}} as a shortcut
for that
Michael
But #2 and #3 are probably overkill anyway.
Cheers
Michael
Am 29.11.2011 um 23:59 schrieb Nigel Small:
Hi Michael
Probably better to just return the full map and let the client code deal
with it ? (If it isn't interested it would either just ignore the return
result or discard it quickly).
Done. Now works as:
MapString,PropertyContainer entities =
GEOFFLoader.loadIntoNeo4j(reader,
db, hooks);
Node nodeFoo = (Node) entities.get((foo));
Node nodeBar = (Node) entities.get((bar));
Intention behind longs, is when I get them from an external source then
they can be used to be look up nodes during import.
This can be done but not sure it's the right place... I'm cautious about
using IDs directly as they aren't very portable. Also, it's not intuitive
whether an ID is for a node or relationship. Would like to get a few
votes
on this - I'm happy to be outvoted if the consensus is to do it!
Also can hooks be used for index lookups? (Just asking)
Are you thinking of something like {People:name=bert}? If so, this is
quite a distance from where we are currently since every token can only
refer to a single entity, whereas an index lookup could return multiple
results.
Nige
*Nigel Small*
Phone: +44 7814 638 246
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On 29 November 2011 22:09, Michael Hunger
michael.hun...@neotechnology.comwrote:
Hmm good question, that means the namespace keeps everything around
until
it is gc'ed ?
Probably better to just return the full map and let the client code deal
with it ? (If it isn't interested it would either just ignore the return
result or discard it quickly).
Intention behind longs, is when I get them from an external source then
they can be used to be look up nodes during import.
Also can hooks be used for index lookups? (Just asking)
Thanks a lot
Michael
Am 29.11.2011 um 22:58 schrieb Nigel Small:
Hi Michael
Doesn't handle iterables (yet) but should be quite easy to add in. What
purpose did you have behind longs?
I've just committed a few new methods allowing the Neo4jNamespace
returned
from a loadIntoNeo4j call to be used to retrieve new entities by name
(or a
map of such). The new methods are:
public Node getPreexistingNode(String name)
public MapString, Node getPreexistingNodes(String... names)
public Node getNewlyCreatedNode(String name)
public MapString, Node getNewlyCreatedNodes(String... names)
public Relationship getPreexistingRelationship(String name)
public MapString, Relationship getPreexistingRelationships(String...
names)
public Relationship getNewlyCreatedRelationship(String name)
public MapString, Relationship getNewlyCreatedRelationships(String...
names)
One of the tests in GraphDescriptionTest illustrates simple usage,
thus:
Neo4jNamespace ns = GEOFFLoader.loadIntoNeo4j(reader, db, hooks);
Node nodeFoo = ns.getNewlyCreatedNode(foo);
Node nodeBar = ns.getNewlyCreatedNode(bar);
Hope this helps - I'll have a play with iterables next.
Cheers
Nige
*Nigel Small*
Phone: +44 7814 638 246
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On 29 November 2011 15:58, Michael Hunger
michael.hun...@neotechnology.comwrote:
does it also handle iterables of nodes/rels (and probably Longs?)
while thinking about it
it would be great if the loader could also return a map of variables
of
the things generated to be used further in processing
that could also interesting for cascading geoff and/or cypher
cool stuff big thanks
michael
mobile mail please excuse brevity and typos
Am 29.11.2011 um 16:18 schrieb Peter Neubauer
peter.neuba...@neotechnology.com:
That sounds great! Let me know when you are stable, and I will see if
I can do some more on the
[Neo4j] Which Ruby REST client for neo4j?
Basically subject says it all. More detailed question is at SO: http://stackoverflow.com/questions/8335136/which-ruby-client-for-neo4j-rest-api So basically there are 3 main options: neograhy - just plain REST API. Nothing to do with models etc. neology - is just a wrapper over neography and isn't a full featured ActiveModel. architect4r - conforms to ActiveModel, but provides only one way to query data (Gypher language), also no indexes support. Which of them and why would you (not) use? Cheers. -- View this message in context: http://neo4j-community-discussions.438527.n3.nabble.com/Which-Ruby-REST-client-for-neo4j-tp3550245p3550245.html Sent from the Neo4j Community Discussions mailing list archive at Nabble.com. ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] Spring integration problem
Hi Frank, Which version of Srping Data Neo4j (and which version of Spring) are you running? It say it misses one of the Spring classes: org/springframework/beans/factory/xml/NamespaceHandlerSupport Which is normally included in spring-beans-3.0.6-RELEASE.jar Can you show the output of mvn dependency:tree Thanks a lot Michael Please try the latest version of SDN - 2.0.0.RC1. Am 30.11.2011 um 20:30 schrieb Frank: Hi, I would like to use the Spring integration feature described on the springdataNeo4j page. My project already uses both Spring and Maven, and I am familiar with how to set up dependencies and Spring beans. I already have the neo4j server running on my localhost and I've been able to test it via the browser interface, so I know that part works. Unfortunately, despite carefully following the tutorial's instructions, and carefully examining everything I'm doing including making sure that every possible dependency is declared correctly, I cannot get Spring to load the graph database service due to an exception Invalid NamespaceHandler class. This is my Spring configuration file: ?xml version=1.0 encoding=UTF-8? beans xmlns=http://www.springframework.org/schema/beans; xmlns:xsi=http://www.w3.org/2001/XMLSchema-instance; xmlns:neo4j=http://www.springframework.org/schema/data/neo4j; xsi:schemaLocation=http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/data/neo4j http://www.springframework.org/schema/data/neo4j/spring-neo4j-2.0.xsd; neo4j:config graphDatabaseService=graphDatabaseService/ bean id=graphDatabaseService class=org.springframework.data.neo4j.rest.SpringRestGraphDatabase constructor-arg value=http://localhost:7474/db/data// /bean /beans This is the full stack trace of the exception: 11/30/2011 13:07:34 [INFO] main (XmlBeanDefinitionReader.java:315) - Loading XML bean definitions from class path resource [neo4j.xml] org.springframework.beans.factory.BeanDefinitionStoreException: Unexpected exception parsing XML document from class path resource [neo4j.xml]; nested exception is org.springframework.beans.FatalBeanException: Invalid NamespaceHandler class [org.springframework.data.neo4j.config.DataGraphNamespaceHandler] for namespace [http://www.springframework.org/schema/data/neo4j]: problem with handler class file or dependent class; nested exception is java.lang.NoClassDefFoundError: org/springframework/beans/factory/xml/NamespaceHandlerSupport at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:412) at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:334) at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:302) at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:143) at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:178) at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:149) at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:212) at org.springframework.context.support.AbstractXmlApplicationContext.loadBeanDefinitions(AbstractXmlApplicationContext.java:126) at org.springframework.context.support.AbstractXmlApplicationContext.loadBeanDefinitions(AbstractXmlApplicationContext.java:92) at org.springframework.context.support.AbstractRefreshableApplicationContext.refreshBeanFactory(AbstractRefreshableApplicationContext.java:130) at org.springframework.context.support.AbstractApplicationContext.obtainFreshBeanFactory(AbstractApplicationContext.java:467) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:397) at org.springframework.context.support.ClassPathXmlApplicationContext.init(ClassPathXmlApplicationContext.java:139) at org.springframework.context.support.ClassPathXmlApplicationContext.init(ClassPathXmlApplicationContext.java:93) at neo4j.Populate.init(Populate.java:32) at neo4j.Populate.main(Populate.java:18) Caused by: org.springframework.beans.FatalBeanException: Invalid NamespaceHandler class [org.springframework.data.neo4j.config.DataGraphNamespaceHandler] for namespace [http://www.springframework.org/schema/data/neo4j]: problem with handler class file or dependent class; nested exception is java.lang.NoClassDefFoundError:
Re: [Neo4j] Cypher Query Optimizing
Martin, would you be so kind as to test the current neo4j-1.6 snapshot with your query? We did some changes in cypher and would like to see how that affects your query. Thanks a lot Michael Am 30.11.2011 um 18:34 schrieb Martin Junghanns: @Tero @Krzysztof thx for your fast replies. @Krzysztof for me it was not fairly well known. I will also check out the traverser api. @Tero I tried the same query using the internal id instead of my mapping index (lucene) orig: START n=node:words(w_id = '137') MATCH n-[:CO_S]-m, n-[:CO_S]- t, m-[r:CO_S]- t return m.w_id, t.w_id, r.sig, r.freq took: 662ms (average of 100 runs after 10 warmups) new: START n=node(119) MATCH n-[:CO_S]-m, n-[:CO_S]- t, m-[r:CO_S]- t return m.w_id, t.w_id, r.sig, r.freq took: 644ms (average of 100 runs after 10 warmups) So it doesn't seem to be much more faster not using the index for node lookup. I will check out your posts concerning Lucene Index. Greetings, Martin Am 30.11.2011 18:08, schrieb Krzysztof Raczyński: It is fairly well known that cypher queries are not (yet) optimised. If speed is a concern for you, try using traversal API, i can confirm it is much faster than cypher. cheers ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] Spring integration problem
Thanks for the reply. I worked with another developer for several hours and we seem to have solved the namespace handler problem. However, I'm stuck with another problem where I cannot declare the SpringRestGraphDatabase without getting a NullPointerException (I can't create it programatically either). I posted the details to the list in a separate message. We're using Spring 3.0.5, but we tried upgrading to 3.0.6 as well. I tried both 2.0.0.RC1 and 2.0.0.BUILD-SNAPSHOT but didn't see any difference between them. I think the NullPointerException is my last hurdle to getting something working at this point. Frank On Nov 30, 2011, at 6:46 PM, Michael Hunger [via Neo4j Community Discussions] wrote: Hi Frank, Which version of Srping Data Neo4j (and which version of Spring) are you running? It say it misses one of the Spring classes: org/springframework/beans/factory/xml/NamespaceHandlerSupport Which is normally included in spring-beans-3.0.6-RELEASE.jar Can you show the output of mvn dependency:tree Thanks a lot Michael Please try the latest version of SDN - 2.0.0.RC1. Am 30.11.2011 um 20:30 schrieb Frank: Hi, I would like to use the Spring integration feature described on the springdataNeo4j page. My project already uses both Spring and Maven, and I am familiar with how to set up dependencies and Spring beans. I already have the neo4j server running on my localhost and I've been able to test it via the browser interface, so I know that part works. Unfortunately, despite carefully following the tutorial's instructions, and carefully examining everything I'm doing including making sure that every possible dependency is declared correctly, I cannot get Spring to load the graph database service due to an exception Invalid NamespaceHandler class. This is my Spring configuration file: ?xml version=1.0 encoding=UTF-8? beans xmlns=http://www.springframework.org/schema/beans; xmlns:xsi=http://www.w3.org/2001/XMLSchema-instance; xmlns:neo4j=http://www.springframework.org/schema/data/neo4j; xsi:schemaLocation=http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/data/neo4j http://www.springframework.org/schema/data/neo4j/spring-neo4j-2.0.xsd; neo4j:config graphDatabaseService=graphDatabaseService/ bean id=graphDatabaseService class=org.springframework.data.neo4j.rest.SpringRestGraphDatabase constructor-arg value=http://localhost:7474/db/data// /bean /beans This is the full stack trace of the exception: 11/30/2011 13:07:34 [INFO] main (XmlBeanDefinitionReader.java:315) - Loading XML bean definitions from class path resource [neo4j.xml] org.springframework.beans.factory.BeanDefinitionStoreException: Unexpected exception parsing XML document from class path resource [neo4j.xml]; nested exception is org.springframework.beans.FatalBeanException: Invalid NamespaceHandler class [org.springframework.data.neo4j.config.DataGraphNamespaceHandler] for namespace [http://www.springframework.org/schema/data/neo4j]: problem with handler class file or dependent class; nested exception is java.lang.NoClassDefFoundError: org/springframework/beans/factory/xml/NamespaceHandlerSupport at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:412) at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:334) at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:302) at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:143) at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:178) at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:149) at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:212) at org.springframework.context.support.AbstractXmlApplicationContext.loadBeanDefinitions(AbstractXmlApplicationContext.java:126) at org.springframework.context.support.AbstractXmlApplicationContext.loadBeanDefinitions(AbstractXmlApplicationContext.java:92) at org.springframework.context.support.AbstractRefreshableApplicationContext.refreshBeanFactory(AbstractRefreshableApplicationContext.java:130) at org.springframework.context.support.AbstractApplicationContext.obtainFreshBeanFactory(AbstractApplicationContext.java:467) at
Re: [Neo4j] NullPointerException in ExecutingRestRequest
Frank,
sorry to hear that.
I just tried it and it works as expected.
final SpringRestGraphDatabase gdb = new
SpringRestGraphDatabase(http://localhost:7474/db/data/;);
final Node node = gdb.getReferenceNode();
assertEquals(0,node.getId());
What version of the Neo4j-Server are you using? Could you please also show the
output of mvn dependency:tree ?
Thanks a lot
Michael
if you execute it via curl, what are the results?
ynagzet:spring-data-neo4j mh$ curl http://localhost:7474/db/data/ -i
HTTP/1.1 200 OK
Content-Length: 620
Content-Encoding: UTF-8
Content-Type: application/json
Access-Control-Allow-Origin: *
Server: Jetty(6.1.25)
{
relationship_index : http://localhost:7474/db/data/index/relationship;,
node : http://localhost:7474/db/data/node;,
relationship_types : http://localhost:7474/db/data/relationship/types;,
neo4j_version : 1.6.M01,
batch : http://localhost:7474/db/data/batch;,
extensions_info : http://localhost:7474/db/data/ext;,
node_index : http://localhost:7474/db/data/index/node;,
reference_node : http://localhost:7474/db/data/node/0;,
extensions : {
GremlinPlugin : {
execute_script :
http://localhost:7474/db/data/ext/GremlinPlugin/graphdb/execute_script;
}
}
}ynagzet:spring-data-neo4j mh$ curl http://localhost:7474/db/data -i
HTTP/1.1 302 Found
Location: http://localhost:7474/db/data/
Content-Length: 0
Server: Jetty(6.1.25)
Am 01.12.2011 um 00:19 schrieb Frank:
The server is running on localhost and can be hit from a browser. The
server's configuration was modified to allow requests from any IP address,
although all of my attempts are from the localhost anyway.
I've tried this with and without a trailing slash on the URI, no difference.
Code:
GraphDatabase graphDb = new
SpringRestGraphDatabase(http://localhost:7474/db/data;);
graphDb.getReferenceNode();
Result:
java.lang.NullPointerException
at
org.neo4j.rest.graphdb.ExecutingRestRequest.uriWithoutSlash(ExecutingRestRequest.java:78)
at
org.neo4j.rest.graphdb.ExecutingRestRequest.init(ExecutingRestRequest.java:72)
at
org.neo4j.rest.graphdb.ExecutingRestRequest.with(ExecutingRestRequest.java:149)
at org.neo4j.rest.graphdb.entity.RestEntity.init(RestEntity.java:52)
at org.neo4j.rest.graphdb.entity.RestNode.init(RestNode.java:47)
at org.neo4j.rest.graphdb.RestAPI.getReferenceNode(RestAPI.java:168)
at
org.neo4j.rest.graphdb.RestGraphDatabase.getReferenceNode(RestGraphDatabase.java:71)
at neo4j.Populate.init(Populate.java:35)
at neo4j.Populate.main(Populate.java:18)
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[Neo4j] CQL find by name
I have seen both this:
START root=node:node_auto_index(name = 'FileRoot')
and this used:
START root=node:node_auto_index('name: FileRoot')
Isn't the second one more appropriate since the first one could be mixed up
with an assignment and the second one looks more like a key:value pair. More
simple to get and you don't have to change syntax style when you are using
*.
START root=node:node_auto_index('name: FileRoot*')
Correct me if I am missing something.
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[Neo4j] Will there ever be a native SDK for Node.js?
Have been reading through the Java documentation. Having a native SDK seems to be a big win when interacting with Neo4j. I wonder if you have any plans on making a native SDK for Node.js since apps on Heroku could run on Node.js as well. Thanks Johnny -- View this message in context: http://neo4j-community-discussions.438527.n3.nabble.com/Will-there-ever-be-a-native-SDK-for-Node-js-tp3550518p3550518.html Sent from the Neo4j Community Discussions mailing list archive at Nabble.com. ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] Will there ever be a native SDK for Node.js?
Have been reading through the Java documentation. Having a native SDK seems to be a big win when interacting with Neo4j. What exactly do you mean by that? With REST API you have number of advantages too. I wonder if you have any plans on making a native SDK for Node.js since apps on Heroku could run on Node.js as well. I don't think the native SDK for non-Java platform will ever be released. It would be totally different product then. So your best bet is the REST API. ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
[Neo4j] REST API - always batch?
Hi, I wonder what the disadvantages would be if every request to the server would always be a batch (even for simple GETs)? This would make it easier to use the API from the application. How bad is this idea? Cheers, Dima http://www.ApproachE.com ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] social network may exceed the number of nodes / relationships / properties
Hi, I may be mistaken, but I think your estimates are a bit high. Neo4j is running in production in many social deployments. If you want to build a social network, then Neo4j is the way to go. By the time your social network outgrows the current limits of Neo4j, we will most likely support sharding for wide-scale deployments. Feel free to keep us posted on your progress. David On Wed, Nov 30, 2011 at 9:24 AM, gustavoboby gustavob...@gmail.com wrote: Hi peoples, I need to do in a social network the same of facebook does into a private messages and post's. However, I have the following concern: It is expected up to 1 million users in the social network, if each person to write one million times (between posts and private messages) in one year. My fear is exceeding the number of properties / relationships / nodes How would you do in this situation? what do you recommend? -- View this message in context: http://neo4j-community-discussions.438527.n3.nabble.com/social-network-may-exceed-the-number-of-nodes-relationships-properties-tp3549025p3549025.html Sent from the Neo4j Community Discussions mailing list archive at Nabble.com. ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user -- David Montag david.mon...@neotechnology.com Neo Technology, www.neotechnology.com Cell: 650.556.4411 Skype: ddmontag ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] Will there ever be a native SDK for Node.js?
What are the advantages of using HTTP directly over native SDK like the Java one? Don't they have a native SDK for Python and Ruby as well (although I think they are just wrappers for tje HTTP API?) Johnny -- View this message in context: http://neo4j-community-discussions.438527.n3.nabble.com/Will-there-ever-be-a-native-SDK-for-Node-js-tp3550518p3550633.html Sent from the Neo4j Community Discussions mailing list archive at Nabble.com. ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
[Neo4j] Gremlin Query - Help
Hi,
Scenario 1:
I would like to get all Nodes that do not have a relationship to another node.
What is the best way to do this Gremlin?
Root = NodeA = NodeB
Root = NodeC
Output should be NodeC
Scenario 2:
Root = User - Centre
I would like to get all centres for userA, and then get all users who are also
linked to the same centres of the userA
Scenario 3:
User = Centre
I would like to get all users that do not have a link to a Centre, and if this
is the case, do a projection that returns a fake centre with property Unknown
Scenario 4:
REFERRAL = PERSON
I would like to combine a query that gets all
Referrals that are linked to a person and project a table result (contains
referrals and person property values (this is easy to do)
However, I then want to do a SPLIT query, that gets referrals without the
persons, and then MERGE both back into the table projection? So table projecton
might look like this.
I guess this is done with .table().it{}cap, but what I am not sure, is how
to do a split and merge in parallel and then get that merge projected into the
same table.
ReferralId, Name
1, Bob
2, Jill
3, null
4, null
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Re: [Neo4j] Will there ever be a native SDK for Node.js?
On 01/12/2011, at 4:32 PM, yobi wrote: What are the advantages of using HTTP directly over native SDK like the Java one? You have to understand that native runs as as part of the same process. And that's why it's supposed to be faster. Running as part of the app means that you lock the database to one single app (you can't just go and fix production data). With REST, you have a separate server. Thus multiple applications can use. Or you can access it directly through normal web browser to fix your data. Or even run background jobs against that server. All that is not possible with native. Don't they have a native SDK for Python and Ruby as well (although I think they are just wrappers for tje HTTP API?) No. Saying native it means that it is native to Java only. So as long as you are on JVM, you can use the native SDK. There are versions of Ruby (JRuby) and Python (Jypthon) that are built specifically to target JVM. And that's why you can use it. But if you want to use normal Ruby or Python, your only option is REST. Same applies to your case with Nodejs. ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] Will there ever be a native SDK for Node.js?
if you just want to use javascript you can look into rhino. for the REST APO there neo4j,js and juggledb or using the http calls directly hth michael mobile mail please excuse brevity and typos Am 01.12.2011 um 07:06 schrieb Dmytrii Nagirniak dna...@gmail.com: On 01/12/2011, at 4:32 PM, yobi wrote: What are the advantages of using HTTP directly over native SDK like the Java one? You have to understand that native runs as as part of the same process. And that's why it's supposed to be faster. Running as part of the app means that you lock the database to one single app (you can't just go and fix production data). With REST, you have a separate server. Thus multiple applications can use. Or you can access it directly through normal web browser to fix your data. Or even run background jobs against that server. All that is not possible with native. Don't they have a native SDK for Python and Ruby as well (although I think they are just wrappers for tje HTTP API?) No. Saying native it means that it is native to Java only. So as long as you are on JVM, you can use the native SDK. There are versions of Ruby (JRuby) and Python (Jypthon) that are built specifically to target JVM. And that's why you can use it. But if you want to use normal Ruby or Python, your only option is REST. Same applies to your case with Nodejs. ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] REST API - always batch?
Dmytri, sounds like an interesting plan! I don't think there is anything directly that I can see, except a bug, https://github.com/neo4j/community/issues/113 with \\ which you might watch our for, reported by Josh Adell. Let us know how it works out! Cheers, /peter neubauer GTalk: neubauer.peter Skype peter.neubauer Phone +46 704 106975 LinkedIn http://www.linkedin.com/in/neubauer Twitter http://twitter.com/peterneubauer brew install neo4j neo4j start heroku addons:add neo4j On Thu, Dec 1, 2011 at 5:53 AM, Dmytrii Nagirniak dna...@gmail.com wrote: Hi, I wonder what the disadvantages would be if every request to the server would always be a batch (even for simple GETs)? This would make it easier to use the API from the application. How bad is this idea? Cheers, Dima http://www.ApproachE.com ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
