Re: [Neo4j] REST API - always batch?

[Peter Neubauer]

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
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brew install neo4j && neo4j start
heroku addons:add neo4j



On Thu, Dec 1, 2011 at 5:53 AM, Dmytrii Nagirniak  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
>
>
>
>
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Re: [Neo4j] Will there ever be a native SDK for Node.js?

[Michael Hunger]

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 :

> 
> 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.  
> 
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Re: [Neo4j] Will there ever be a native SDK for Node.js?

[Dmytrii Nagirniak]

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.  

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[Neo4j] Gremlin Query - Help

[Romiko Derbynew]

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?

[yobi]

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

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Re: [Neo4j] social network may exceed the number of nodes / relationships / properties

[David Montag]

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  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:
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Cell: 650.556.4411
Skype: ddmontag
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[Neo4j] REST API - always batch?

[Dmytrii Nagirniak]

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




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Re: [Neo4j] Will there ever be a native SDK for Node.js?

[Dmytrii Nagirniak]

> 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.
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[Neo4j] Will there ever be a native SDK for Node.js?

[yobi]

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

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[Neo4j] CQL find by name

[yobi]

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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Re: [Neo4j] NullPointerException in ExecutingRestRequest

[Michael Hunger]

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.(ExecutingRestRequest.java:72)
>   at
> org.neo4j.rest.graphdb.ExecutingRestRequest.with(ExecutingRestRequest.java:149)
>   at org.neo4j.rest.graphdb.entity.RestEntity.(RestEntity.java:52)
>   at org.neo4j.rest.graphdb.entity.RestNode.(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.(Populate.java:35)
>   at neo4j.Populate.main(Populate.java:18)
> 
> 
> --
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Re: [Neo4j] Spring integration problem

[Frank]

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: 
> > 
> >  
> >  > 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";> 
> > 
> >  
> > 
> >  > class="org.springframework.data.neo4j.rest.SpringRestGraphDatabase"> 
> > http://localhost:7474/db/data/"/> 
> >  
> > 
> >  
> > 
> > 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)
> >  
>

Re: [Neo4j] Cypher Query Optimizing

[Michael Hunger]

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
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Re: [Neo4j] Spring integration problem

[Michael Hunger]

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:
> 
> 
>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";>
>   
>   
>   
>class="org.springframework.data.neo4j.rest.SpringRestGraphDatabase">
>   http://localhost:7474/db/data/"/>
>   
>   
> 
> 
> 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.(ClassPathXmlApplicationContext.java:139)
>   at
> org.springframework.context.support.ClassPathXmlApplicationContext.(ClassPathXmlApplicationContext.java:93)
>   at neo4j.Populate.(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.DefaultNames

[Neo4j] Which Ruby REST client for neo4j?

[dnagir]

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.

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Re: [Neo4j] py2neo - GEOFF enhancements

[Nigel Small]

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
Blog: http://nigelsmall.name/
GTalk: ni...@nigelsmall.name
MSN: nasm...@live.co.uk
Skype: technige
Twitter: @technige 
LinkedIn: http://uk.linkedin.com/in/nigelsmall



On 29 November 2011 23:33, Michael Hunger
wrote:

> #1 Thanks
> #2 You're probably right
>
> #3 You can do the index lookup outside and pass in the IndexHits 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:
> >
> > Map 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
> > Blog: http://nigelsmall.name/
> > GTalk: ni...@nigelsmall.name
> > MSN: nasm...@live.co.uk
> > Skype: technige
> > Twitter: @technige 
> > LinkedIn: http://uk.linkedin.com/in/nigelsmall
> >
> >
> >
> > On 29 November 2011 22:09, Michael Hunger
> > wrote:
> >
> >> 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 Map getPreexistingNodes(String... names)
> >>> public Node getNewlyCreatedNode(String name)
> >>> public Map getNewlyCreatedNodes(String... names)
> >>> public Relationship getPreexistingRelationship(String name)
> >>> public Map getPreexistingRelationships(String...
> >>> names)
> >>> public Relationship getNewlyCreatedRelationship(String name)
> >>> public Map 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
> >>> Blog: http://nigelsmall.name/
> >>> GTalk: ni...@nigelsmall.name
> >>> MSN: nasm...@live.co.uk
> >>> Skype: technige
> >>> Twitter: @technige 
> >>> LinkedIn: http://uk.linkedin.com/in/nigelsmall
> >>>
> >>>
> >>>
> >>> On 29 November 2011 15:58, Michael Hunger
> >>> wrote:
> >>>
>  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
> >>

[Neo4j] WADL specification is the complete reference for all HTTP interactions with Neo4j?

[yobi]

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?

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Re: [Neo4j] Cypher Query Optimizing

[Krzysztof Raczyński]

> 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 ?
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[Neo4j] NullPointerException in ExecutingRestRequest

[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.(ExecutingRestRequest.java:72)
at
org.neo4j.rest.graphdb.ExecutingRestRequest.with(ExecutingRestRequest.java:149)
at org.neo4j.rest.graphdb.entity.RestEntity.(RestEntity.java:52)
at org.neo4j.rest.graphdb.entity.RestNode.(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.(Populate.java:35)
at neo4j.Populate.main(Populate.java:18)


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[Neo4j] Using Neo4j as a document database (SO-Question)

[Michael Hunger]

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?



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Re: [Neo4j] Persisting community information

[Akhil]

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 
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[Neo4j] Persisting community information

[Paul A. Jackson]

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 
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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.

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Re: [Neo4j] New Bug Logged - Gremlin 114

[Romiko Derbynew]

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

GTalk:      neubauer.peter
Skype       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  
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] Spring integration problem

[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:


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";>




http://localhost:7474/db/data/"/>




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.(ClassPathXmlApplicationContext.java:139)
at
org.springframework.context.support.ClassPathXmlApplicationContext.(ClassPathXmlApplicationContext.java:93)
at neo4j.Populate.(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
org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.parseBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:135)
at
org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.registerBeanDefinitions(DefaultBeanDefinitio

Re: [Neo4j] Id capacity exceeded

[Alfredas Chmieliauskas]

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
 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
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> 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
>  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)
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Re: [Neo4j] Cypher Query Optimizing

[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
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[Neo4j] social network may exceed the number of nodes / relationships / properties

[gustavoboby]

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?

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Re: [Neo4j] Cypher Query Optimizing

[Tero Paananen]

> 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
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Re: [Neo4j] Cypher Query Optimizing

[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
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[Neo4j] Cypher Query Optimizing

[Martin Junghanns]

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)
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Re: [Neo4j] New Bug Logged - Gremlin 114

[Marko Rodriguez]

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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Re: [Neo4j] New Bug Logged - Gremlin 114

[Marko Rodriguez]

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
> 
> 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 1:31 AM, Romiko Derbynew
>  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] Neo4j Tutorial

[Jacob Hansson]

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 wrote:

> 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.
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[Neo4j] Neo4j Tutorial

[bigToch]

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, 

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Re: [Neo4j] Using in-memory DB for unit tests

[Jon Walton]

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 :
>
> > 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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Re: [Neo4j] Neo4j Spatial build / run problems

[Peter Neubauer]

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
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brew install neo4j && neo4j start
heroku addons:add neo4j



On Wed, Nov 30, 2011 at 3:04 PM, danielb  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
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Re: [Neo4j] Neo4j Spatial build / run problems

[danielb]

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)

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Re: [Neo4j] Neo4j Spatial build / run problems

[danielb]

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

Re: [Neo4j] Moving to u...@neo4j.org

[Niels Hoogeveen]

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
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> 
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[Neo4j] Named matched with depth gives error

[dnagir]

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.

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[Neo4j] Moving to u...@neo4j.org

[Peter Neubauer]

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

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Re: [Neo4j] How to return the start nodes of all the paths with Cypher

[Peter Neubauer]

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

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On Wed, Nov 30, 2011 at 11:46 AM, Andres Taylor
 wrote:
> On Wed, Nov 30, 2011 at 11:32 AM, dnagir  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
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Re: [Neo4j] Id capacity exceeded

[Peter Neubauer]

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

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On Tue, Nov 29, 2011 at 6:58 PM, Alfredas Chmieliauskas
 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)
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Re: [Neo4j] How to return the start nodes of all the paths with Cypher

[dnagir]

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.



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Re: [Neo4j] How to return the start nodes of all the paths with Cypher

[Andres Taylor]

On Wed, Nov 30, 2011 at 11:32 AM, dnagir  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
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Re: [Neo4j] RETURN DISTINCT with ORDER BY

[Dmytrii Nagirniak]

Thanks. I'll keep it in mind.


On 30/11/2011, at 7:34 PM, Andres Taylor wrote:

> On Wed, Nov 30, 2011 at 6:27 AM, dnagir  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
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Re: [Neo4j] RETURN DISTINCT with ORDER BY

[dnagir]

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



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Re: [Neo4j] How to return the start nodes of all the paths with Cypher

[dnagir]

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) )

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?

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Re: [Neo4j] How to return the start nodes of all the paths with Cypher

[Andres Taylor]

On Wed, Nov 30, 2011 at 10:59 AM, Dmytrii Nagirniak wrote:

> Yes, but I don't know the exact paths. Those were just examples. And the
> depth may be higher than 10. So I can't hardcode it into the query.


Ah, now I understand. Sorry about the mix-up...

This is a weak area for Cypher right now. It's in the back log, but nothing
else. If you have any ideas on how to express that, we're always open to
suggestions.

Andrés
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Re: [Neo4j] How to return the start nodes of all the paths with Cypher

[Dmytrii Nagirniak]

Yes, but I don't know the exact paths. Those were just examples. And the
depth may be higher than 10. So I can't hardcode it into the query.
On Nov 30, 2011 6:33 PM, "Andres Taylor" 
wrote:

> Hey there,
>
> That looks like a straight forward pattern matching problem, right?
>
> START c=node(1)
> MATCH a-->b-->c, d-->c, d-->b-->c, e-->f-->c
> RETURN a,d,e
>
> This is assuming that you have the node id of c. If not, read up how you do
> an index start point.
>
> Does that help?
>
> Andrés
>
>
> On Wed, Nov 30, 2011 at 7:48 AM, dnagir  wrote:
>
> > Hi,
> >
> > How can I find all the nodes that "start a path"
> >
> > So that I start at node "c" and paths
> > "a->b->c",
> > "d->c",
> > "d->b->c",
> > "e->f->c"
> > I want to retrieve nodes "a", "d" and "e".
> >
> >
> >
> > --
> > 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-tp3547480p3547480.html
> > Sent from the Neo4j Community Discussions mailing list archive at
> > Nabble.com.
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Re: [Neo4j] EJB3 and Legacy applications

[nrkkalyan]

Hey,

Sure I will take a look at jo4neo. Thanks for your help. Will keep posting
and continue working..

Kalyan

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Re: [Neo4j] Neo4J for semantic graphs + algorithms

[Sébastien HARISPE]

Hi,
Mattias, I just wanted to give you my thanks for the help, I really
appreciate you taking the time.
As you proposed, I will manage tmp data outside the graph.

SH

On Mon, Nov 21, 2011 at 7:30 AM, Mattias Persson
wrote:

> Den söndagen den 20:e november 2011 skrev Sébastien HARISPE<
> harispe.sebast...@gmail.com>:
> > Hello,
> > Sorry for the delay in responding, I was busy these days.
> >
> > Marko
> > I will test the proposed stack Thx!
> >
> > Mattias
> > I work on graph based semantic similarity/proximity measures.
> > In this case the graph is most of the time a reduction of an ontology i.e
> a
> > DAG corresponding to the rdfs:SubClassOf backbone of the specification.
> > Most of proposed measures use set of ancestors/descendants and require a
> > transitive reduction as preprocess...
> > I just wanted to known if Neo4J proposed facilities to store temporaly
> data
> > during a traversal or if I have to manage them by myself.
>
> The closest would be to begin transaction and modify the graph as you go
> along to later rollback the transaction. The problem is that you would lock
> those parts of the graph during that transaction. So it might be better to
> manage it outside the graph if you'd like to have concurrent traversals
> over the same subset of the graph
> >
> > Thanks a lot
> >
> > SH
> >
> > On Wed, Nov 16, 2011 at 9:21 AM, Mattias Persson
> > wrote:
> >
> >> 2011/11/13 Sébastien HARISPE 
> >>
> >> > Hi all,
> >> >
> >> > First of all, Thx a lot for your amazing work, simply astonishing...
> >> > Below three questions related to my interest in using Neo4J as a Graph
> DB
> >> > on top of which I want to test algorithms dedicated to large semantic
> >> > graphs  (OWL/RDF based).
> >> > It would be nice if you could help me answer them.
> >> >
> >> >
> >> > A -Using Neo4J with semantic web technologies like RDF/OWL/SPARQL:
> >> >
> >> > How does Neo4J interact with these technologies?
> >> >
> >> > I found/read:
> >> >
> >> >   - an old post explaining how to load OWL into Neo4J using Jena API
> >> > [1]<
> >> >
> >>
> http://sujitpal.blogspot.com/2009/05/using-neo4j-to-load-and-query-owl.html
> >> > >
> >> >   .
> >> >   - interesting classes in the org.neo4j.meta.model package
> >> > [2
> >> >   ,3<
> >> >
> >>
>
> http://components.neo4j.org/neo4j-meta-model-import/snapshot/apidocs/org/neo4j/meta/input/owl/Owl2GraphDb.html
> >> > >]
> >> >   but I can't locate the package in the 1.5 apidocs
> >> > [4]
> >> >   .
> >> >   - that the org.neo4j.rdf and org.neo4j.meta do not follow the core
> >> >   components release, are they currently supported?
> >> >   - a ticket related to the addition of SPARQL plugin to the Neo4J
> >> server,
> >> >   which means that semantic processes are part of your preoccupations
> ;).
> >> >
> >> > Can you detail the position of Neo4J considering OWL/RDF/SPARQL
> >> > technologies?
> >> > I can't easily find documentation about Neo4J and OWL
> >> > [5],
> >> > the use of RDF and SPARQL is well detailed however
> >> > [6]
> >> > .
> >> > I also read about Sail on top of Neo4j
> >> > [7],
> >> > and to be honest, I'm quite lost...
> >> >
> >> > Do you think Neo4J is an interesting solution to interact with these
> >> > technologies, that is to say, loading OWL specification as graph
> >> > (simplification of the spec e.g classes, instances relationships
> between
> >> > them), adding RDF triplet and using SPARQL?
> >> >
> >> >
> >> >
> >> > B - Algorithm implementations:
> >> >
> >> > As you know many graph algorithms need to store temporary results e.g.
> >> > Dijkstra stores shortest path cost for all nodes during execution.
> >> > Due to the size of the graphs, storing this information in memory is
> not
> >> > possible most of the time, so how do you manage this information?
> >> Temporary
> >> > node properties? Is there guidance to implement algorithms using
> Neo4J?
> >> >
> >> > For extremely big traversal that could be a problem and the algorithms
> >> that come with Neo4j (Dijkstra, A*, Shortest path etc.) don't use
> temporary
> >> properties. How big traversals are we talking about? I know I've done A*
> on
> >> rather many millions of relationships/nodes. Most algorithms touch only
> a
> >> fraction of the full graph of course so that's usually not a problem
> even
> >> if there are a billion relationships.
> >>
> >> >
> >> >
> >> > C - In-memory usage of Neo4J:
> >> >
> >> > In-memory graphs are very pleasant in order to perform certain CPU
> >> > consuming algorithmic treatments on a reduced part of the graph.
> >> > Considering an old post
> >> > [8]<  >
>
> --
> Mattias Persson, [matt...@neotechnology.com]
> Hacker, 

Re: [Neo4j] RETURN DISTINCT with ORDER BY

[Andres Taylor]

On Wed, Nov 30, 2011 at 6:27 AM, dnagir  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
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Re: [Neo4j] How to return the start nodes of all the paths with Cypher

[Andres Taylor]

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 :)

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Re: [Neo4j] New Bug Logged - Gremlin 114

[Peter Neubauer]

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
 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

[Michael Hunger]

what about

start c=node(1)
match path = c<-[*]->n
return NODES(path)

Returns the end nodes of your paths.

HTH

Michael

Am 30.11.2011 um 08:33 schrieb Andres Taylor:

> Hey there,
> 
> That looks like a straight forward pattern matching problem, right?
> 
> START c=node(1)
> MATCH a-->b-->c, d-->c, d-->b-->c, e-->f-->c
> RETURN a,d,e
> 
> This is assuming that you have the node id of c. If not, read up how you do
> an index start point.
> 
> Does that help?
> 
> Andrés
> 
> 
> On Wed, Nov 30, 2011 at 7:48 AM, dnagir  wrote:
> 
>> Hi,
>> 
>> How can I find all the nodes that "start a path"
>> 
>> So that I start at node "c" and paths
>> "a->b->c",
>> "d->c",
>> "d->b->c",
>> "e->f->c"
>> I want to retrieve nodes "a", "d" and "e".
>> 
>> 
>> 
>> --
>> 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-tp3547480p3547480.html
>> Sent from the Neo4j Community Discussions mailing list archive at
>> Nabble.com.
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