Re: [Neo4j] REST API - always batch?
Thanks Peter. I was asking because of the request to support batching in neography: https://github.com/maxdemarzi/neography/issues/16 I sounds like the normal API is obsolete then :) It encourages non-transactional operations. I think the batch-ing should be promoted a little bit more. Check the availability and place the reservation if something is still available is pretty hard to implement without it. Not sure if batching supports conditional operations though. Does it? Is there anything that would be impossible/slow etc to do with batching? I mean, there must be some drawbacks :) Cheers. On 01/12/2011, at 6:08 PM, Peter Neubauer wrote: 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 ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] REST API - always batch?
I think especially for atomic create operations that will be solved by a GEOFF import plugin in the future. which allows for updates/insertions of subgraphs. https://github.com/nigelsmall/py2neo/wiki/GEOFF Michael Am 01.12.2011 um 09:03 schrieb Dmytrii Nagirniak: Thanks Peter. I was asking because of the request to support batching in neography: https://github.com/maxdemarzi/neography/issues/16 I sounds like the normal API is obsolete then :) It encourages non-transactional operations. I think the batch-ing should be promoted a little bit more. Check the availability and place the reservation if something is still available is pretty hard to implement without it. Not sure if batching supports conditional operations though. Does it? Is there anything that would be impossible/slow etc to do with batching? I mean, there must be some drawbacks :) Cheers. On 01/12/2011, at 6:08 PM, Peter Neubauer wrote: 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 ___ 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] Named matched with depth gives error
On Wed, Nov 30, 2011 at 1:57 PM, dnagir dna...@gmail.com wrote: 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. I fixed this yesterdayhttps://github.com/neo4j/community/commit/37c2867871c7d953c2021177d0b72cd8ba825be0. Sorry you ran into it... Andrés ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] CQL find by name
In my opinion, the current syntax reminds me of SQL, which is a good thing. All the newbies like me can easily wrap their head around the concepts, without much problem. Since you can't do an actual assignment in Cypher (please correct me if i am wrong), an equal sign clearly means comparison only. ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] Cypher Query Optimizing
Am 01.12.2011 01:48, schrieb Michael Hunger: Martin, Michael, :) would you be so kind as to test the current neo4j-1.6 snapshot with your query? I used neo4j 1.6 M01 community edition for my tests. We did some changes in cypher and would like to see how that affects your query. Thanks a lot Michael Greetings, Martin 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 ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] CQL find by name
Actually they map to two different calls of the neo4j core API.
The first one is a exact lookup for the value.
The second one takes an arbitrary query string and executes it against an
index, so it is much more powerful.
(But also dependend on the index-provider)
Main difference is that the query string has to be parsed by the index.
And around parameters, first one is better if you want to have the lookup
variable fixed.
start node=node:index(key={param})
start node=node:index({param})
Cheers
Michael
Am 01.12.2011 um 03:56 schrieb 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.
--
View this message in context:
http://neo4j-community-discussions.438527.n3.nabble.com/CQL-find-by-name-tp3550446p3550446.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
[Neo4j] spring data neo4j Relationships
Hey, after reading the docs and looking at the examples, I give up trying to find a solution for myself. The problem is the following: How are @RelationshipEntity classes persistet? I have the same stucture as in the Movies Example: the classes Actor -- Role -- Movie. When adding a new Role to an Actor and saving the Actor Entity using the ActorRepository, the new edges are not persisted in the database. Do I have to persist the Role Entities manually? If yes, what Repository shall I use for that? this is part of my Actor class @GraphId private Long id; // 1:n relation @RelatedToVia CollectionTMS_Rel OpTmRs; // 1:1 relation to store the latest link ... this works and the ede is persistet private TMS OpTmRs_Latest; this is part of my Role class @GraphId Long id; @StartNode WTUR wturInstance; @EndNode TMS tmsInstance; long timestamp; and finally this is the other end of the edge, my Movie class @GraphId private Long id; @RelatedTo(type = TMS_REL, direction = INCOMING) SetWTUR wturs; @RelatedToVia(type = TMS_REL, direction = INCOMING) IterableTMS_Rel tmsRels; So, all single edges work perfectly, but the sets don't. Hope someone can help me out with that Greetings, Martin ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] spring data neo4j Relationships
Martin, are you using the simple mapping (w/o AJ) or the advanced AspectJ mapping? I assume the simple mapping: There are several ways of persisting a RelationshipEntity() * (template or repository).createRelationshipBetween() * (template or repository).save(new Role(movie, actor, rolenName)); * node-entity with @Fetch @RelatedToVia SetRole roles=new HashSetRole(); actor = (template or repository).findOne(actorId); // or other loading mechanisms actor.roles.add(new Role(movie, actor, rolenName)); (template or repository).save(actor) if you are not using the first approach, you have to provide a RelationshipType for Role * as part of the @RelationshipEntity(type=TYPE) annotation * or as a @RelationshipType String type; field We can also have a skype call if you want to clarify things. HTH, Michael Am 01.12.2011 um 12:49 schrieb Martin Junghanns: Hey, after reading the docs and looking at the examples, I give up trying to find a solution for myself. The problem is the following: How are @RelationshipEntity classes persistet? I have the same stucture as in the Movies Example: the classes Actor -- Role -- Movie. When adding a new Role to an Actor and saving the Actor Entity using the ActorRepository, the new edges are not persisted in the database. Do I have to persist the Role Entities manually? If yes, what Repository shall I use for that? this is part of my Actor class @GraphId private Long id; // 1:n relation @RelatedToVia CollectionTMS_Rel OpTmRs; // 1:1 relation to store the latest link ... this works and the ede is persistet private TMS OpTmRs_Latest; this is part of my Role class @GraphId Long id; @StartNode WTUR wturInstance; @EndNode TMS tmsInstance; long timestamp; and finally this is the other end of the edge, my Movie class @GraphId private Long id; @RelatedTo(type = TMS_REL, direction = INCOMING) SetWTUR wturs; @RelatedToVia(type = TMS_REL, direction = INCOMING) IterableTMS_Rel tmsRels; So, all single edges work perfectly, but the sets don't. Hope someone can help me out with that Greetings, Martin ___ 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?
On Thu, Dec 1, 2011 at 9:03 AM, Dmytrii Nagirniak dna...@gmail.com wrote: Thanks Peter. I was asking because of the request to support batching in neography: https://github.com/maxdemarzi/neography/issues/16 I sounds like the normal API is obsolete then :) It encourages non-transactional operations. I think the batch-ing should be promoted a little bit more. Check the availability and place the reservation if something is still available is pretty hard to implement without it. Not sure if batching supports conditional operations though. Does it? Is there anything that would be impossible/slow etc to do with batching? I mean, there must be some drawbacks :) There are a few reasons we aren't pushing the batch API as the primary way to work with REST. One is that it's a bit more complex to get started with, but the two primary reasons are these: 1. There are limits to how large the results can be from a batch API call. The batch API supports streaming deserialization of it's input, but output is still created as a giant string in memory. It is reasonably easy to hit the limits of how large the batch API results can be when you start batching requests. 2. We don't want it to be the primary API. We have lots of ideas for how we can improve the current REST API (add full transactional support, massively improve throughput and latency), and so we would rather go down that road. The batch API is a pragmatic solution to a big problem, but I don't think it is a good long-term path to take. /jake Cheers. On 01/12/2011, at 6:08 PM, Peter Neubauer wrote: 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 ___ 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] Will there ever be a native SDK for Node.js?
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. I wouldn't say that. It's not possible using Neo4J APIs directly, but with Spring Data for Neo4J and the rest of the Spring framework (as an example) it's pretty damn easy to provide remote access to a Neo4J data store. -TPP ___ 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?
Actually that is true with many technologies. to provide a REST-Endpoint Neo4j-Servers you can use: * jruby with sinatra/rails * python * as you said SDN * playframework and scala * clojure (and whatever rest-framework on top) * or even pure netty based high performance servers * or other java REST API's on top of the core-API IMHO more important is the protocol between your frontend and the neo4j-rest-endpoints, those should speak domain language and protocol and not necessarily nodes and relationships :) Cheers Michael Am 01.12.2011 um 13:34 schrieb Tero Paananen: 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. I wouldn't say that. It's not possible using Neo4J APIs directly, but with Spring Data for Neo4J and the rest of the Spring framework (as an example) it's pretty damn easy to provide remote access to a Neo4J data store. -TPP ___ 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] Will there ever be a native SDK for Node.js?
Why not take a look at RingoJS? Would be uber easy to integrate native Neo4J APIs. -Original Message- From: user-boun...@lists.neo4j.org [mailto:user-boun...@lists.neo4j.org] On Behalf Of yobi Sent: Wednesday, November 30, 2011 10:59 PM To: user@lists.neo4j.org Subject: [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 ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] REST API - always batch?
To toss my two cents in, I had been thinking about moving my REST library to use only batches for all CRUID operations. I've been putting it off, and I will probably drop the idea for now based on Jake's response. Jacob Hansson-2 wrote 1. There are limits to how large the results can be from a batch API call... 2. ...We have lots of ideas for how we can improve the current REST API (add full transactional support, massively improve throughput and latency)... Having real transactions via the REST API (a bit of an oxymoron?) would be most welcome. -- Josh PS, has anyone else used the acronym CRUID (Create Read Update Index Delete) to describe Neo4j operations? My other attempt was ICRUD but that sounds like the stuff you rub out of your eyes when you wake up in the morning. -- View this message in context: http://neo4j-community-discussions.438527.n3.nabble.com/Neo4j-REST-API-always-batch-tp3550568p3551739.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] REST API - always batch?
iCrud sounds more like what Apple fans will be asking for this Christmas. On 1 Dec 2011 14:46, jadell josh.ad...@gmail.com wrote: To toss my two cents in, I had been thinking about moving my REST library to use only batches for all CRUID operations. I've been putting it off, and I will probably drop the idea for now based on Jake's response. Jacob Hansson-2 wrote 1. There are limits to how large the results can be from a batch API call... 2. ...We have lots of ideas for how we can improve the current REST API (add full transactional support, massively improve throughput and latency)... Having real transactions via the REST API (a bit of an oxymoron?) would be most welcome. -- Josh PS, has anyone else used the acronym CRUID (Create Read Update Index Delete) to describe Neo4j operations? My other attempt was ICRUD but that sounds like the stuff you rub out of your eyes when you wake up in the morning. -- View this message in context: http://neo4j-community-discussions.438527.n3.nabble.com/Neo4j-REST-API-always-batch-tp3550568p3551739.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
[Neo4j] Cypher syntax for conditional path segments?
The query works fine for all *complete* paths. Now I would like to get all incomplete paths as well, meaning all a without any BASED ON, all a-[:BASED_ON]-b without CALLS and so on. Is this possible using cypher? Optional relationships result in null relations, which cypher does not like when it binds to a path variable. Best regards Johann -- View this message in context: http://neo4j-community-discussions.438527.n3.nabble.com/Cypher-syntax-for-conditional-path-segments-tp3551867p3551867.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 question - subqueries possible?
Once I find the time to set up a blog, I'l happily do that. What's still annoying me is that I do not understand the difference between the query pairs 7/8 and 9/10 ... -- View this message in context: http://neo4j-community-discussions.438527.n3.nabble.com/cypher-question-subqueries-possible-tp3543685p3551887.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] NullPointerException in ExecutingRestRequest
Hi Michael,
My curl result looks like this:
$ curl http://localhost:7474/db/data/ -i
HTTP/1.1 200 OK
Content-Length: 680
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 : 1.5,
batch : http://localhost:7474/db/data/batch;,
extensions_info : http://localhost:7474/db/data/ext;,
node_index : http://localhost:7474/db/data/index/node;,
extensions : {
CypherPlugin : {
execute_query :
http://localhost:7474/db/data/ext/CypherPlugin/graphdb/execute_query;
},
GremlinPlugin : {
execute_script :
http://localhost:7474/db/data/ext/GremlinPlugin/graphdb/execute_script;
}
}
}
I installed what I thought was the latest version of the server.
My Maven dependency tree is enourmous because the rest of my application uses a
lot of things. I think this is the part you're interested in, though.
[INFO] +-
org.springframework.data:spring-data-neo4j:jar:2.0.0.BUILD-SNAPSHOT:compile
[INFO] | +- org.springframework:spring-beans:jar:3.0.6.RELEASE:compile
[INFO] | +- org.springframework:spring-aspects:jar:3.0.6.RELEASE:compile
[INFO] | +-
org.springframework.data:spring-data-commons-core:jar:1.2.0.M2:compile
[INFO] | +- org.slf4j:jcl-over-slf4j:jar:1.6.1:compile
[INFO] | +- cglib:cglib:jar:2.2:compile
[INFO] | +- org.neo4j:neo4j:jar:1.5:compile
[INFO] | | +- org.neo4j:neo4j-kernel:jar:1.5:compile
[INFO] | | | \-
org.apache.geronimo.specs:geronimo-jta_1.1_spec:jar:1.1.1:compile
[INFO] | | +- org.neo4j:neo4j-lucene-index:jar:1.5:compile
[INFO] | | +- org.neo4j:neo4j-graph-algo:jar:1.5:compile
[INFO] | | +- org.neo4j:neo4j-udc:jar:1.5:compile
[INFO] | | +- org.neo4j:neo4j-graph-matching:jar:1.5:compile
[INFO] | | \- org.neo4j:neo4j-jmx:jar:1.5:compile
[INFO] | +- org.neo4j:neo4j-cypher-dsl:jar:1.5:compile
[INFO] | +-
org.hibernate.javax.persistence:hibernate-jpa-2.0-api:jar:1.0.0.Final:compile
[INFO] | \- javax.validation:validation-api:jar:1.0.0.GA:compile
[INFO] +-
org.springframework.data:spring-data-neo4j-rest:jar:2.0.0.BUILD-SNAPSHOT:compile
[INFO] | +- org.neo4j:neo4j-rest-graphdb:jar:1.5:compile
[INFO] | | \- org.neo4j:server-api:jar:1.5:compile
[INFO] | | +- javax.ws.rs:jsr311-api:jar:1.1.1:compile
[INFO] | | \- commons-configuration:commons-configuration:jar:1.6:compile
[INFO] | |\- commons-beanutils:commons-beanutils-core:jar:1.8.0:compile
[INFO] | +- org.codehaus.jackson:jackson-jaxrs:jar:1.6.1:compile
[INFO] | +- com.sun.jersey:jersey-server:jar:1.4:compile
[INFO] | | \- com.sun.jersey:jersey-core:jar:1.4:compile
[INFO] | \- com.sun.jersey:jersey-client:jar:1.4:compile
On Nov 30, 2011, at 8:37 PM, Michael Hunger [via Neo4j Community Discussions]
wrote:
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
Re: [Neo4j] cypher question - subqueries possible?
On Thu, Dec 1, 2011 at 4:55 PM, jschweigl johann.schwe...@gmail.com wrote: Once I find the time to set up a blog, I'l happily do that. What's still annoying me is that I do not understand the difference between the query pairs 7/8 and 9/10 ... I'll have a go. The difference between 7 and 8 is which relationship is optional 7: scenario-[:HAS_MOCKUP]-mock-[r?:HAS_MOCKUP]-sub 8: scenario-[r?:HAS_MOCKUP]-mock-[:HAS_MOCKUP]-sub (I've rewritten the second match to better show the difference.) Both *scenario* and *sub* are bound, so only the relationship marked with *r * is optional. Now, if we're looking at a *scenario* that has no *mock*s connected to it, no subgraphs will match with query number 7, but with query 8 you can still get matches. I hope this makes sense. Let me know if it doesn't. Query 10 I'm assuming has a typo in it. You bind an identifier named *sub*, but in the match, you use *subprocess*. Here are the interesting parts of queries 9 and 10. I've reworked the match of query 10 to make the difference more notable, and I've fixed what I think is a typo: 9: MATCH sub-[:HAS_MOCKUP]-mock-[:HAS_MOCKUP]-scenario 10: MATCH sub-[:HAS_MOCKUP]-mock-[r?:HAS_MOCKUP]-scenario WHERE r IS NULL This makes the difference much clearer - query 9 will return all *sub* and * scenario* combinations connected over a mock, and query 10 will return all combinations* *not connected. Hope this helps. Andrés ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] NullPointerException in ExecutingRestRequest
I tried switching to version 1.6 (Current Milestone) and now it works.
Am I correct in concluding that the restful client services are not compatible
with version 1.5?
As version 1.5 is listed as the current stable version, I'm a little
suprised/concerned by this.
Frank
On Nov 30, 2011, at 8:37 PM, Michael Hunger [via Neo4j Community Discussions]
wrote:
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)
--
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
[hidden email]
https://lists.neo4j.org/mailman/listinfo/user
___
Neo4j mailing list
[hidden email]
https://lists.neo4j.org/mailman/listinfo/user
If you reply to this email, your message will be added to the discussion
below:
http://neo4j-community-discussions.438527.n3.nabble.com/NullPointerException-in-ExecutingRestRequest-tp3550067p3550419.html
To unsubscribe from NullPointerException in ExecutingRestRequest, click here.
NAML
--
View this message in context:
http://neo4j-community-discussions.438527.n3.nabble.com/NullPointerException-in-ExecutingRestRequest-tp3550067p3552186.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] NullPointerException in ExecutingRestRequest
Hi Frank,
this is really weird. Your server is missing the exploratory URL for the
reference node.
The (Spring)RestGraphDatabaseService uses this URL to get the URL for the
ReferenceNode.
I don't know why your sever is missing that.
I just downloaded 1.5 community for unix and started the server, it reports the
reference_node url as expected:
ynagzet:neo4j-community-1.5 mh$ curl http://localhost:7474/db/data/
{
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 : 1.5,
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 : {
CypherPlugin : {
execute_query :
http://localhost:7474/db/data/ext/CypherPlugin/graphdb/execute_query;
},
GremlinPlugin : {
execute_script :
http://localhost:7474/db/data/ext/GremlinPlugin/graphdb/execute_script;
}
}
}
Am 01.12.2011 um 17:53 schrieb Frank:
Hi Michael,
My curl result looks like this:
$ curl http://localhost:7474/db/data/ -i
HTTP/1.1 200 OK
Content-Length: 680
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 : 1.5,
batch : http://localhost:7474/db/data/batch;,
extensions_info : http://localhost:7474/db/data/ext;,
node_index : http://localhost:7474/db/data/index/node;,
extensions : {
CypherPlugin : {
execute_query :
http://localhost:7474/db/data/ext/CypherPlugin/graphdb/execute_query;
},
GremlinPlugin : {
execute_script :
http://localhost:7474/db/data/ext/GremlinPlugin/graphdb/execute_script;
}
}
}
I installed what I thought was the latest version of the server.
My Maven dependency tree is enourmous because the rest of my application uses
a lot of things. I think this is the part you're interested in, though.
[INFO] +-
org.springframework.data:spring-data-neo4j:jar:2.0.0.BUILD-SNAPSHOT:compile
[INFO] | +- org.springframework:spring-beans:jar:3.0.6.RELEASE:compile
[INFO] | +- org.springframework:spring-aspects:jar:3.0.6.RELEASE:compile
[INFO] | +-
org.springframework.data:spring-data-commons-core:jar:1.2.0.M2:compile
[INFO] | +- org.slf4j:jcl-over-slf4j:jar:1.6.1:compile
[INFO] | +- cglib:cglib:jar:2.2:compile
[INFO] | +- org.neo4j:neo4j:jar:1.5:compile
[INFO] | | +- org.neo4j:neo4j-kernel:jar:1.5:compile
[INFO] | | | \-
org.apache.geronimo.specs:geronimo-jta_1.1_spec:jar:1.1.1:compile
[INFO] | | +- org.neo4j:neo4j-lucene-index:jar:1.5:compile
[INFO] | | +- org.neo4j:neo4j-graph-algo:jar:1.5:compile
[INFO] | | +- org.neo4j:neo4j-udc:jar:1.5:compile
[INFO] | | +- org.neo4j:neo4j-graph-matching:jar:1.5:compile
[INFO] | | \- org.neo4j:neo4j-jmx:jar:1.5:compile
[INFO] | +- org.neo4j:neo4j-cypher-dsl:jar:1.5:compile
[INFO] | +-
org.hibernate.javax.persistence:hibernate-jpa-2.0-api:jar:1.0.0.Final:compile
[INFO] | \- javax.validation:validation-api:jar:1.0.0.GA:compile
[INFO] +-
org.springframework.data:spring-data-neo4j-rest:jar:2.0.0.BUILD-SNAPSHOT:compile
[INFO] | +- org.neo4j:neo4j-rest-graphdb:jar:1.5:compile
[INFO] | | \- org.neo4j:server-api:jar:1.5:compile
[INFO] | | +- javax.ws.rs:jsr311-api:jar:1.1.1:compile
[INFO] | | \- commons-configuration:commons-configuration:jar:1.6:compile
[INFO] | |\-
commons-beanutils:commons-beanutils-core:jar:1.8.0:compile
[INFO] | +- org.codehaus.jackson:jackson-jaxrs:jar:1.6.1:compile
[INFO] | +- com.sun.jersey:jersey-server:jar:1.4:compile
[INFO] | | \- com.sun.jersey:jersey-core:jar:1.4:compile
[INFO] | \- com.sun.jersey:jersey-client:jar:1.4:compile
On Nov 30, 2011, at 8:37 PM, Michael Hunger [via Neo4j Community Discussions]
wrote:
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 :
Re: [Neo4j] NullPointerException in ExecutingRestRequest
Interesting. I did create and delete a few nodes manually via the Web interface
right when I first installed the server. Maybe there's some bug related to
that. In any case, it seems to be working now that I reinstalled the server
with 1.6.
On Dec 1, 2011, at 12:12 PM, Michael Hunger [via Neo4j Community Discussions]
wrote:
Hi Frank,
this is really weird. Your server is missing the exploratory URL for the
reference node.
The (Spring)RestGraphDatabaseService uses this URL to get the URL for the
ReferenceNode.
I don't know why your sever is missing that.
I just downloaded 1.5 community for unix and started the server, it reports
the reference_node url as expected:
ynagzet:neo4j-community-1.5 mh$ curl http://localhost:7474/db/data/
{
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 : 1.5,
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 : {
CypherPlugin : {
execute_query :
http://localhost:7474/db/data/ext/CypherPlugin/graphdb/execute_query;
},
GremlinPlugin : {
execute_script :
http://localhost:7474/db/data/ext/GremlinPlugin/graphdb/execute_script;
}
}
}
Am 01.12.2011 um 17:53 schrieb Frank:
Hi Michael,
My curl result looks like this:
$ curl http://localhost:7474/db/data/ -i
HTTP/1.1 200 OK
Content-Length: 680
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 : 1.5,
batch : http://localhost:7474/db/data/batch;,
extensions_info : http://localhost:7474/db/data/ext;,
node_index : http://localhost:7474/db/data/index/node;,
extensions : {
CypherPlugin : {
execute_query :
http://localhost:7474/db/data/ext/CypherPlugin/graphdb/execute_query;
},
GremlinPlugin : {
execute_script :
http://localhost:7474/db/data/ext/GremlinPlugin/graphdb/execute_script;
}
}
}
I installed what I thought was the latest version of the server.
My Maven dependency tree is enourmous because the rest of my application
uses a lot of things. I think this is the part you're interested in,
though.
[INFO] +-
org.springframework.data:spring-data-neo4j:jar:2.0.0.BUILD-SNAPSHOT:compile
[INFO] | +- org.springframework:spring-beans:jar:3.0.6.RELEASE:compile
[INFO] | +- org.springframework:spring-aspects:jar:3.0.6.RELEASE:compile
[INFO] | +-
org.springframework.data:spring-data-commons-core:jar:1.2.0.M2:compile
[INFO] | +- org.slf4j:jcl-over-slf4j:jar:1.6.1:compile
[INFO] | +- cglib:cglib:jar:2.2:compile
[INFO] | +- org.neo4j:neo4j:jar:1.5:compile
[INFO] | | +- org.neo4j:neo4j-kernel:jar:1.5:compile
[INFO] | | | \-
org.apache.geronimo.specs:geronimo-jta_1.1_spec:jar:1.1.1:compile
[INFO] | | +- org.neo4j:neo4j-lucene-index:jar:1.5:compile
[INFO] | | +- org.neo4j:neo4j-graph-algo:jar:1.5:compile
[INFO] | | +- org.neo4j:neo4j-udc:jar:1.5:compile
[INFO] | | +- org.neo4j:neo4j-graph-matching:jar:1.5:compile
[INFO] | | \- org.neo4j:neo4j-jmx:jar:1.5:compile
[INFO] | +- org.neo4j:neo4j-cypher-dsl:jar:1.5:compile
[INFO] | +-
org.hibernate.javax.persistence:hibernate-jpa-2.0-api:jar:1.0.0.Final:compile
[INFO] | \- javax.validation:validation-api:jar:1.0.0.GA:compile
[INFO] +-
org.springframework.data:spring-data-neo4j-rest:jar:2.0.0.BUILD-SNAPSHOT:compile
[INFO] | +- org.neo4j:neo4j-rest-graphdb:jar:1.5:compile
[INFO] | | \- org.neo4j:server-api:jar:1.5:compile
[INFO] | | +- javax.ws.rs:jsr311-api:jar:1.1.1:compile
[INFO] | | \-
commons-configuration:commons-configuration:jar:1.6:compile
[INFO] | |\-
commons-beanutils:commons-beanutils-core:jar:1.8.0:compile
[INFO] | +- org.codehaus.jackson:jackson-jaxrs:jar:1.6.1:compile
[INFO] | +- com.sun.jersey:jersey-server:jar:1.4:compile
[INFO] | | \- com.sun.jersey:jersey-core:jar:1.4:compile
[INFO] | \- com.sun.jersey:jersey-client:jar:1.4:compile
On Nov 30, 2011, at 8:37 PM, Michael Hunger [via Neo4j Community
Discussions] wrote:
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();
Re: [Neo4j] NullPointerException in ExecutingRestRequest
Did you by chance delete the reference node too? (aka. node 0)
I tried it and it seems to be the reason.
After deleting the reference node it is no longer shown in the graph
representation.
I will add an appropriate Exception to java-rest-graphdb
Cheers,
Michael
Am 01.12.2011 um 19:20 schrieb Frank:
Interesting. I did create and delete a few nodes manually via the Web
interface right when I first installed the server. Maybe there's some bug
related to that. In any case, it seems to be working now that I reinstalled
the server with 1.6.
On Dec 1, 2011, at 12:12 PM, Michael Hunger [via Neo4j Community Discussions]
wrote:
Hi Frank,
this is really weird. Your server is missing the exploratory URL for the
reference node.
The (Spring)RestGraphDatabaseService uses this URL to get the URL for the
ReferenceNode.
I don't know why your sever is missing that.
I just downloaded 1.5 community for unix and started the server, it reports
the reference_node url as expected:
ynagzet:neo4j-community-1.5 mh$ curl http://localhost:7474/db/data/
{
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 : 1.5,
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 : {
CypherPlugin : {
execute_query :
http://localhost:7474/db/data/ext/CypherPlugin/graphdb/execute_query;
},
GremlinPlugin : {
execute_script :
http://localhost:7474/db/data/ext/GremlinPlugin/graphdb/execute_script;
}
}
}
Am 01.12.2011 um 17:53 schrieb Frank:
Hi Michael,
My curl result looks like this:
$ curl http://localhost:7474/db/data/ -i
HTTP/1.1 200 OK
Content-Length: 680
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 : 1.5,
batch : http://localhost:7474/db/data/batch;,
extensions_info : http://localhost:7474/db/data/ext;,
node_index : http://localhost:7474/db/data/index/node;,
extensions : {
CypherPlugin : {
execute_query :
http://localhost:7474/db/data/ext/CypherPlugin/graphdb/execute_query;
},
GremlinPlugin : {
execute_script :
http://localhost:7474/db/data/ext/GremlinPlugin/graphdb/execute_script;
}
}
}
I installed what I thought was the latest version of the server.
My Maven dependency tree is enourmous because the rest of my application
uses a lot of things. I think this is the part you're interested in,
though.
[INFO] +-
org.springframework.data:spring-data-neo4j:jar:2.0.0.BUILD-SNAPSHOT:compile
[INFO] | +- org.springframework:spring-beans:jar:3.0.6.RELEASE:compile
[INFO] | +- org.springframework:spring-aspects:jar:3.0.6.RELEASE:compile
[INFO] | +-
org.springframework.data:spring-data-commons-core:jar:1.2.0.M2:compile
[INFO] | +- org.slf4j:jcl-over-slf4j:jar:1.6.1:compile
[INFO] | +- cglib:cglib:jar:2.2:compile
[INFO] | +- org.neo4j:neo4j:jar:1.5:compile
[INFO] | | +- org.neo4j:neo4j-kernel:jar:1.5:compile
[INFO] | | | \-
org.apache.geronimo.specs:geronimo-jta_1.1_spec:jar:1.1.1:compile
[INFO] | | +- org.neo4j:neo4j-lucene-index:jar:1.5:compile
[INFO] | | +- org.neo4j:neo4j-graph-algo:jar:1.5:compile
[INFO] | | +- org.neo4j:neo4j-udc:jar:1.5:compile
[INFO] | | +- org.neo4j:neo4j-graph-matching:jar:1.5:compile
[INFO] | | \- org.neo4j:neo4j-jmx:jar:1.5:compile
[INFO] | +- org.neo4j:neo4j-cypher-dsl:jar:1.5:compile
[INFO] | +-
org.hibernate.javax.persistence:hibernate-jpa-2.0-api:jar:1.0.0.Final:compile
[INFO] | \- javax.validation:validation-api:jar:1.0.0.GA:compile
[INFO] +-
org.springframework.data:spring-data-neo4j-rest:jar:2.0.0.BUILD-SNAPSHOT:compile
[INFO] | +- org.neo4j:neo4j-rest-graphdb:jar:1.5:compile
[INFO] | | \- org.neo4j:server-api:jar:1.5:compile
[INFO] | | +- javax.ws.rs:jsr311-api:jar:1.1.1:compile
[INFO] | | \-
commons-configuration:commons-configuration:jar:1.6:compile
[INFO] | |\-
commons-beanutils:commons-beanutils-core:jar:1.8.0:compile
[INFO] | +- org.codehaus.jackson:jackson-jaxrs:jar:1.6.1:compile
[INFO] | +- com.sun.jersey:jersey-server:jar:1.4:compile
[INFO] | | \- com.sun.jersey:jersey-core:jar:1.4:compile
[INFO] | \- com.sun.jersey:jersey-client:jar:1.4:compile
On Nov 30, 2011, at 8:37 PM, Michael Hunger [via Neo4j Community
Discussions] wrote:
Frank,
sorry to hear that.
I just tried it and it works as
Re: [Neo4j] NullPointerException in ExecutingRestRequest
I may well have done that, yes. I wasn't aware that node 0 was the same as the
reference node.
On Dec 1, 2011, at 12:44 PM, Michael Hunger [via Neo4j Community Discussions]
wrote:
Did you by chance delete the reference node too? (aka. node 0)
I tried it and it seems to be the reason.
After deleting the reference node it is no longer shown in the graph
representation.
I will add an appropriate Exception to java-rest-graphdb
Cheers,
Michael
Am 01.12.2011 um 19:20 schrieb Frank:
Interesting. I did create and delete a few nodes manually via the Web
interface right when I first installed the server. Maybe there's some bug
related to that. In any case, it seems to be working now that I reinstalled
the server with 1.6.
On Dec 1, 2011, at 12:12 PM, Michael Hunger [via Neo4j Community
Discussions] wrote:
Hi Frank,
this is really weird. Your server is missing the exploratory URL for the
reference node.
The (Spring)RestGraphDatabaseService uses this URL to get the URL for the
ReferenceNode.
I don't know why your sever is missing that.
I just downloaded 1.5 community for unix and started the server, it
reports the reference_node url as expected:
ynagzet:neo4j-community-1.5 mh$ curl http://localhost:7474/db/data/
{
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 : 1.5,
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 : {
CypherPlugin : {
execute_query :
http://localhost:7474/db/data/ext/CypherPlugin/graphdb/execute_query;
},
GremlinPlugin : {
execute_script :
http://localhost:7474/db/data/ext/GremlinPlugin/graphdb/execute_script;
}
}
}
Am 01.12.2011 um 17:53 schrieb Frank:
Hi Michael,
My curl result looks like this:
$ curl http://localhost:7474/db/data/ -i
HTTP/1.1 200 OK
Content-Length: 680
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 : 1.5,
batch : http://localhost:7474/db/data/batch;,
extensions_info : http://localhost:7474/db/data/ext;,
node_index : http://localhost:7474/db/data/index/node;,
extensions : {
CypherPlugin : {
execute_query :
http://localhost:7474/db/data/ext/CypherPlugin/graphdb/execute_query;
},
GremlinPlugin : {
execute_script :
http://localhost:7474/db/data/ext/GremlinPlugin/graphdb/execute_script;
}
}
}
I installed what I thought was the latest version of the server.
My Maven dependency tree is enourmous because the rest of my application
uses a lot of things. I think this is the part you're interested in,
though.
[INFO] +-
org.springframework.data:spring-data-neo4j:jar:2.0.0.BUILD-SNAPSHOT:compile
[INFO] | +- org.springframework:spring-beans:jar:3.0.6.RELEASE:compile
[INFO] | +- org.springframework:spring-aspects:jar:3.0.6.RELEASE:compile
[INFO] | +-
org.springframework.data:spring-data-commons-core:jar:1.2.0.M2:compile
[INFO] | +- org.slf4j:jcl-over-slf4j:jar:1.6.1:compile
[INFO] | +- cglib:cglib:jar:2.2:compile
[INFO] | +- org.neo4j:neo4j:jar:1.5:compile
[INFO] | | +- org.neo4j:neo4j-kernel:jar:1.5:compile
[INFO] | | | \-
org.apache.geronimo.specs:geronimo-jta_1.1_spec:jar:1.1.1:compile
[INFO] | | +- org.neo4j:neo4j-lucene-index:jar:1.5:compile
[INFO] | | +- org.neo4j:neo4j-graph-algo:jar:1.5:compile
[INFO] | | +- org.neo4j:neo4j-udc:jar:1.5:compile
[INFO] | | +- org.neo4j:neo4j-graph-matching:jar:1.5:compile
[INFO] | | \- org.neo4j:neo4j-jmx:jar:1.5:compile
[INFO] | +- org.neo4j:neo4j-cypher-dsl:jar:1.5:compile
[INFO] | +-
org.hibernate.javax.persistence:hibernate-jpa-2.0-api:jar:1.0.0.Final:compile
[INFO] | \- javax.validation:validation-api:jar:1.0.0.GA:compile
[INFO] +-
org.springframework.data:spring-data-neo4j-rest:jar:2.0.0.BUILD-SNAPSHOT:compile
[INFO] | +- org.neo4j:neo4j-rest-graphdb:jar:1.5:compile
[INFO] | | \- org.neo4j:server-api:jar:1.5:compile
[INFO] | | +- javax.ws.rs:jsr311-api:jar:1.1.1:compile
[INFO] | | \-
commons-configuration:commons-configuration:jar:1.6:compile
[INFO] | |\-
commons-beanutils:commons-beanutils-core:jar:1.8.0:compile
[INFO] | +- org.codehaus.jackson:jackson-jaxrs:jar:1.6.1:compile
[INFO] |
[Neo4j] SpringData requires rename of transactionManager
Hi, I find that I'm unable to integrate SpringDataNeo4j into my existing Spring project unless I rename my transaction manager, which is currently declared this way: bean id=transactionManager class=org.springframework.jdbc.datasource.DataSourceTransactionManager property name=dataSource ref=sbDataSource / /bean bean id=transactionTemplate class=org.springframework.transaction.support.TransactionTemplate property name=transactionManager ref=transactionManager / /bean tx:annotation-driven transaction-manager=transactionManager / Unless I rename the first bean to something other than transactionManager, my own Spring beans fail to load. I'm somewhat hesitant to do this because I'm working in a large project with multiple developers and I don't know the full impact of renaming this bean. Is there any other way around the problem? Can I be certain that neo4j will not interfere with my existing JDBC transactions? I'm also a bit curious/confused as to where the neo4j transactionManager bean is coming from. I did not declare any such bean in my Spring configuration files. All I declared was this: neo4j:config graphDatabaseService=graphDatabaseService/ bean id=graphDatabaseService class=org.springframework.data.neo4j.rest.SpringRestGraphDatabase constructor-arg value=http://localhost:7474/db/data// /bean Finally, I'm wondering why I shouldn't just instantiate a SpringRestGraphDatabase object programatically instead of as a Spring bean. Is there any particular disadvantage to doing it programatically beyond the benefits of having Spring manage the lifecycle? Thanks for your help. -- View this message in context: http://neo4j-community-discussions.438527.n3.nabble.com/SpringData-requires-rename-of-transactionManager-tp3552635p3552635.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] allSimplePaths performance
Sure, I sent you a link where you can download a snapshot of the dataset in a separate email. Best regards, Petar On Mon, Nov 28, 2011 at 12:16 PM, Mattias Persson matt...@neotechnology.com wrote: I think I'd need your dataset to be able to reproduce and fix it, would that be possible? 2011/11/25 Petar Dobrev petar.dob...@myphilanthropedia.org On Fri, Nov 25, 2011 at 7:59 PM, Mattias Persson matt...@neotechnology.comwrote: Correct, it finds paths on that depth only. If other paths are encountered along the way they aren't returned. However, in the example I provided it misses a path that is present on the desired depth, that's what I was actually wondering about. In this example: The source of the testing program is here: https://gist.github.com/1391654 Output before adding the additional relationship: https://gist.github.com/1391668 Output after adding the additional relationship: https://gist.github.com/1391661 shortestPath misses one path (at depth 3) unless an additional relationship is present, which is unrelated to the paths between the nodes. Petar ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user -- Mattias Persson, [matt...@neotechnology.com] Hacker, Neo Technology www.neotechnology.com ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user -- Petar Dobrev Engineer Philanthropedia http://www.myphilanthropedia.org ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] py2neo - GEOFF enhancements
Nigel,
is it possible to also do index-lookups in geoff?
and use those as nodes or rels or even as hooks for later on?
I'm also toying with two other ideas:
#1 using indexes as the third primitive besides nodes and rels in geoff just
with a different delimeter (e.g. | as you already have)
#2 giving indexes a similar semantics as relationships to category nodes (which
is the same for in-graph indexes, where the index-name is the category-type and
indexed key-values are properties on the relationship or relationships)
I'm not really satisfied with the syntaxes I came up with and would like to
brainstorm that.
|index| -{foo:bar} -(bert)
some ideas for alternative index syntaxes
#add
|index:{foo:bar}|+={foo}
# replace
|index:{foo:bar}|={foo}
# remove
|index:{foo:bar}|-={foo}
#query
|index:{foo:bar}| -[:KNOWS]-(bert)
|index:querystring| -[:KNOWS]-(bert)
Am 01.12.2011 um 01:32 schrieb 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 https://twitter.com/#%21/technige
LinkedIn: http://uk.linkedin.com/in/nigelsmall
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
Blog: http://nigelsmall.name/
GTalk: ni...@nigelsmall.name
MSN: nasm...@live.co.uk
Skype: technige
Twitter: @technige https://twitter.com/#%21/technige
LinkedIn: http://uk.linkedin.com/in/nigelsmall
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
[Neo4j] Standalone server and transactions
Hi I have read as much I was able to read about Neo4j with the topic I wrote below. My imaginations of DB server (doesn't matter RDBMS or NoSQL) is that the crucial things for DB server is interesting from development point of view are (musts!): 1. DB server must be able to work as standalone server 2. DB server must provide transactions. Can anybody guide me through these 2 things in Neo4j world? Ad 1. There are lots of examples to work with Neo4j as embedded. Actually these examples works, I already made some application that was operating quite good (embedded Neo4j was started/stopped by Singleton EJB). The only problem is that I can use DB via application (x)or Neoclipse. Never both at the same time. This is very annoying to stop the app and connect via Neoclipse and vice versa. Ad2. So first thing what I wanted to do was start Neo4j as standalone server. The problem was thtat the only entry point to Neo4j server is...HTTP REST. This lib (as I know) is not managed by Neo4j project/fellows but some external fellow created it. I say - OK, let it be. But the first thing what was written there was transactions are not supported. Only batch operations but from my point of view this is a bit tricky solution for transactions. Am I missing something? I hope I do, because in this situation, Neo4j isn't actually interesting DB server/solution...but I want it to be. Standalone server and transactions or GTFO. Cheers -- View this message in context: http://neo4j-community-discussions.438527.n3.nabble.com/Standalone-server-and-transactions-tp3553058p3553058.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] Unique constraint and transaction over REST
Hi, I wonder what's the best way to do something similar to unique constraints in RDBMS. For example, user registration requires that the user's email to be unique. Working over in Ruby over REST API, how do you achieve this? I assume I need an auto-index on email property of User nodes. Then query it to check the property. But how can I make it transactional? So that I am sure that between querying and inserting the node, no similar has been inserted. The transactional part better applies to reservation instead of user creation. But you get the point. Cheers. -- View this message in context: http://neo4j-community-discussions.438527.n3.nabble.com/Unique-constraint-and-transaction-over-REST-tp3553148p3553148.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
Hi Michael
GEOFF was originally conceived as a graph serialisation format and, as
such, was intended to represent a snapshot of entities at a particular
point in time instead of, as you are discussing, a programmatic set of
actions (add, replace, remove, etc). That said, these ideas are still worth
exploring...
First off, since hooks are the variables of GEOFF, it would seem
consistent to use those for assigning the return values of index lookups
and queries. Something like the following could be used to perform an index
query, assign the result to a hook and use that hook to build a
relationship:
{foo} := |index| @ {key: value}
{foo}-[:KNOWS]-(bar)
Actually, since the index query may result in multiple returned entities,
we might want to limit to the first item returned:
{foo} := |index| @ {key:value}
{foo.1}-[:KNOWS]-(bar)
Using the other operators for adding, removing and replacing index entries,
this would make...
# add node bert to index at foo:bar
|index| @ {foo: bar} += (bert)
# remove node bert from index at foo:bar
|index| @ {foo: bar} -= (bert)
# replace node with bert in index at foo:bar
|index| @ {foo: bar} := (bert)
So essentially, we would be looking at at least the following requirements:
1. Allow hooks to hold multiple entities instead of just a single entity
2. Allow assignment to hooks
3. Implement an @ operator to allow inline index queries
4. Implement assignment, addition and removal operators to indexes
These ideas would turn GEOFF into much more of a programming language than
a notation for serialisation: a big change and one which would potentially
require another significant rewrite. I'm not against doing this but I'm
wondering if this is a valuable direction to go in and whether, if we were
to do this, it would be better to start from first principles instead.
Would this fill a gap that none of the other current options can?
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 https://twitter.com/#%21/technige
LinkedIn: http://uk.linkedin.com/in/nigelsmall
On 1 December 2011 21:47, Michael Hunger
michael.hun...@neotechnology.comwrote:
Nigel,
is it possible to also do index-lookups in geoff?
and use those as nodes or rels or even as hooks for later on?
I'm also toying with two other ideas:
#1 using indexes as the third primitive besides nodes and rels in geoff
just with a different delimeter (e.g. | as you already have)
#2 giving indexes a similar semantics as relationships to category nodes
(which is the same for in-graph indexes, where the index-name is the
category-type and indexed key-values are properties on the relationship or
relationships)
I'm not really satisfied with the syntaxes I came up with and would like
to brainstorm that.
|index| -{foo:bar} -(bert)
some ideas for alternative index syntaxes
#add
|index:{foo:bar}|+={foo}
# replace
|index:{foo:bar}|={foo}
# remove
|index:{foo:bar}|-={foo}
#query
|index:{foo:bar}| -[:KNOWS]-(bert)
|index:querystring| -[:KNOWS]-(bert)
Am 01.12.2011 um 01:32 schrieb 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 https://twitter.com/#%21/technige
LinkedIn: http://uk.linkedin.com/in/nigelsmall
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
Re: [Neo4j] py2neo - GEOFF enhancements
Peter and I have been discussing what interchange format we'd like to have for
applications feeding data into a graph.
And geoff seems to be quite a good choice.
Modifying and accessing indexes (much like in-file-hooks) would be a part of
that.
So what I imagine is a set of connectors to outside services which are
producing geoff which is then consumed by a server plugin (e.g. for hosted
neo4j services on heroku). Much like STDIN and STDOUT between unix command line
tools.
Having a declarative format that aligns more with cypher is preferable to a
imperative format like the REST API or Gremlin.
That's why I would also like to look into aligning the syntax with the cypher
syntax, actually I'm more fond of the iconographic syntax but there are some
drawbacks on readability for people.
That's some of the reasoning behind it.
Cheers
Michael
Am 02.12.2011 um 01:49 schrieb Nigel Small:
Hi Michael
GEOFF was originally conceived as a graph serialisation format and, as
such, was intended to represent a snapshot of entities at a particular
point in time instead of, as you are discussing, a programmatic set of
actions (add, replace, remove, etc). That said, these ideas are still worth
exploring...
First off, since hooks are the variables of GEOFF, it would seem
consistent to use those for assigning the return values of index lookups
and queries. Something like the following could be used to perform an index
query, assign the result to a hook and use that hook to build a
relationship:
{foo} := |index| @ {key: value}
{foo}-[:KNOWS]-(bar)
Actually, since the index query may result in multiple returned entities,
we might want to limit to the first item returned:
{foo} := |index| @ {key:value}
{foo.1}-[:KNOWS]-(bar)
Using the other operators for adding, removing and replacing index entries,
this would make...
# add node bert to index at foo:bar
|index| @ {foo: bar} += (bert)
# remove node bert from index at foo:bar
|index| @ {foo: bar} -= (bert)
# replace node with bert in index at foo:bar
|index| @ {foo: bar} := (bert)
So essentially, we would be looking at at least the following requirements:
1. Allow hooks to hold multiple entities instead of just a single entity
2. Allow assignment to hooks
3. Implement an @ operator to allow inline index queries
4. Implement assignment, addition and removal operators to indexes
These ideas would turn GEOFF into much more of a programming language than
a notation for serialisation: a big change and one which would potentially
require another significant rewrite. I'm not against doing this but I'm
wondering if this is a valuable direction to go in and whether, if we were
to do this, it would be better to start from first principles instead.
Would this fill a gap that none of the other current options can?
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 https://twitter.com/#%21/technige
LinkedIn: http://uk.linkedin.com/in/nigelsmall
On 1 December 2011 21:47, Michael Hunger
michael.hun...@neotechnology.comwrote:
Nigel,
is it possible to also do index-lookups in geoff?
and use those as nodes or rels or even as hooks for later on?
I'm also toying with two other ideas:
#1 using indexes as the third primitive besides nodes and rels in geoff
just with a different delimeter (e.g. | as you already have)
#2 giving indexes a similar semantics as relationships to category nodes
(which is the same for in-graph indexes, where the index-name is the
category-type and indexed key-values are properties on the relationship or
relationships)
I'm not really satisfied with the syntaxes I came up with and would like
to brainstorm that.
|index| -{foo:bar} -(bert)
some ideas for alternative index syntaxes
#add
|index:{foo:bar}|+={foo}
# replace
|index:{foo:bar}|={foo}
# remove
|index:{foo:bar}|-={foo}
#query
|index:{foo:bar}| -[:KNOWS]-(bert)
|index:querystring| -[:KNOWS]-(bert)
Am 01.12.2011 um 01:32 schrieb 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 https://twitter.com/#%21/technige
LinkedIn: http://uk.linkedin.com/in/nigelsmall
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
[Neo4j] Controlling Traversal Depth with Python Neo4j Bindings
Hi Jake, I have a situation where I want to start at a given node in my graph and traverse down a linear chain of nodes a specified # of hops. Is there a way for me to specify the traversal depth using the Python bindings? If not, what would you suggest as the best way to achieve that goal? Cheers, Chris ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] py2neo - GEOFF enhancements
OK cool, that gives me some context. I'll put together some ideas over the
next few days and we can compare notes :-)
*Nigel Small*
Phone: +44 7814 638 246
Blog: http://nigelsmall.name/
GTalk: ni...@nigelsmall.name
MSN: nasm...@live.co.uk
Skype: technige
Twitter: @technige https://twitter.com/#%21/technige
LinkedIn: http://uk.linkedin.com/in/nigelsmall
On 2 December 2011 01:02, Michael Hunger
michael.hun...@neotechnology.comwrote:
Peter and I have been discussing what interchange format we'd like to have
for applications feeding data into a graph.
And geoff seems to be quite a good choice.
Modifying and accessing indexes (much like in-file-hooks) would be a part
of that.
So what I imagine is a set of connectors to outside services which are
producing geoff which is then consumed by a server plugin (e.g. for hosted
neo4j services on heroku). Much like STDIN and STDOUT between unix command
line tools.
Having a declarative format that aligns more with cypher is preferable to
a imperative format like the REST API or Gremlin.
That's why I would also like to look into aligning the syntax with the
cypher syntax, actually I'm more fond of the iconographic syntax but there
are some drawbacks on readability for people.
That's some of the reasoning behind it.
Cheers
Michael
Am 02.12.2011 um 01:49 schrieb Nigel Small:
Hi Michael
GEOFF was originally conceived as a graph serialisation format and, as
such, was intended to represent a snapshot of entities at a particular
point in time instead of, as you are discussing, a programmatic set of
actions (add, replace, remove, etc). That said, these ideas are still
worth
exploring...
First off, since hooks are the variables of GEOFF, it would seem
consistent to use those for assigning the return values of index lookups
and queries. Something like the following could be used to perform an
index
query, assign the result to a hook and use that hook to build a
relationship:
{foo} := |index| @ {key: value}
{foo}-[:KNOWS]-(bar)
Actually, since the index query may result in multiple returned entities,
we might want to limit to the first item returned:
{foo} := |index| @ {key:value}
{foo.1}-[:KNOWS]-(bar)
Using the other operators for adding, removing and replacing index
entries,
this would make...
# add node bert to index at foo:bar
|index| @ {foo: bar} += (bert)
# remove node bert from index at foo:bar
|index| @ {foo: bar} -= (bert)
# replace node with bert in index at foo:bar
|index| @ {foo: bar} := (bert)
So essentially, we would be looking at at least the following
requirements:
1. Allow hooks to hold multiple entities instead of just a single
entity
2. Allow assignment to hooks
3. Implement an @ operator to allow inline index queries
4. Implement assignment, addition and removal operators to indexes
These ideas would turn GEOFF into much more of a programming language
than
a notation for serialisation: a big change and one which would
potentially
require another significant rewrite. I'm not against doing this but I'm
wondering if this is a valuable direction to go in and whether, if we
were
to do this, it would be better to start from first principles instead.
Would this fill a gap that none of the other current options can?
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 https://twitter.com/#%21/technige
LinkedIn: http://uk.linkedin.com/in/nigelsmall
On 1 December 2011 21:47, Michael Hunger
michael.hun...@neotechnology.comwrote:
Nigel,
is it possible to also do index-lookups in geoff?
and use those as nodes or rels or even as hooks for later on?
I'm also toying with two other ideas:
#1 using indexes as the third primitive besides nodes and rels in geoff
just with a different delimeter (e.g. | as you already have)
#2 giving indexes a similar semantics as relationships to category nodes
(which is the same for in-graph indexes, where the index-name is the
category-type and indexed key-values are properties on the relationship
or
relationships)
I'm not really satisfied with the syntaxes I came up with and would like
to brainstorm that.
|index| -{foo:bar} -(bert)
some ideas for alternative index syntaxes
#add
|index:{foo:bar}|+={foo}
# replace
|index:{foo:bar}|={foo}
# remove
|index:{foo:bar}|-={foo}
#query
|index:{foo:bar}| -[:KNOWS]-(bert)
|index:querystring| -[:KNOWS]-(bert)
Am 01.12.2011 um 01:32 schrieb 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
Re: [Neo4j] Standalone server and transactions
Being able to access a single database is crucial requirement for me (fix production data on the spot, spin multiple instances of the app for example). The options for that are: 1. REST API 2. Native with Enterprise edition (not sure exactly it actually allows connecting from multiple sources?). The option 1 isn't the best fit if you need transactions heavily (which is not common for all applications). The option 2 isn't good if you are not ready to pay the Enterprise price. I lean to have option 1. The batching for transactions may work well enough. I've asked the question about it here: http://neo4j-community-discussions.438527.n3.nabble.com/Unique-constraint-and-transaction-over-REST-tp3553148p3553148.html But basically, with the REST you can't have the transactions as by definition HTTP is stateless. So I would say it's a trade-off. On 02/12/2011, at 9:03 AM, zolv wrote: Hi I have read as much I was able to read about Neo4j with the topic I wrote below. My imaginations of DB server (doesn't matter RDBMS or NoSQL) is that the crucial things for DB server is interesting from development point of view are (musts!): 1. DB server must be able to work as standalone server 2. DB server must provide transactions. Can anybody guide me through these 2 things in Neo4j world? Ad 1. There are lots of examples to work with Neo4j as embedded. Actually these examples works, I already made some application that was operating quite good (embedded Neo4j was started/stopped by Singleton EJB). The only problem is that I can use DB via application (x)or Neoclipse. Never both at the same time. This is very annoying to stop the app and connect via Neoclipse and vice versa. Ad2. So first thing what I wanted to do was start Neo4j as standalone server. The problem was thtat the only entry point to Neo4j server is...HTTP REST. This lib (as I know) is not managed by Neo4j project/fellows but some external fellow created it. I say - OK, let it be. But the first thing what was written there was transactions are not supported. Only batch operations but from my point of view this is a bit tricky solution for transactions. Am I missing something? I hope I do, because in this situation, Neo4j isn't actually interesting DB server/solution...but I want it to be. Standalone server and transactions or GTFO. Cheers -- View this message in context: http://neo4j-community-discussions.438527.n3.nabble.com/Standalone-server-and-transactions-tp3553058p3553058.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] REST API - always batch?
1. There are limits to how large the results can be from a batch API call. Just curious, what those limits are and what happens if you hit it? 2. ... We have lots of ideas for how we can improve the current REST API (add full transactional support, massively improve throughput and latency), and so we would rather go down that road. The batch API is a pragmatic solution to a big problem, but I don't think it is a good long-term path to take. That is really interesting. Can you give a bit more details on the REST transaction API? Any estimations on this? ___ 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?
On 01/12/2011, at 11:34 PM, Tero Paananen wrote: Spring Data for Neo4J and the rest of the Spring framework (as an example) it's pretty damn easy to provide remote access to a Neo4J data store. Are you saying that your WEB application should become a database server? That is not appropriate architecture. And you would have to re-create the API that is already available through neo4js REST API. ___ 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?
On 12/1/2011 10:47 PM, Dmytrii Nagirniak wrote: On 01/12/2011, at 11:34 PM, Tero Paananen wrote: Spring Data for Neo4J and the rest of the Spring framework (as an example) it's pretty damn easy to provide remote access to a Neo4J data store. Are you saying that your WEB application should become a database server? No. I'm saying that you have options that will allow you to easily adapt your solution to whatever your needs are without putting everything and the kitchen sink into the database server. -TPP ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
[Neo4j] Design Guides
Hi, Are there any database *design* guidelines to follow? What I mean by that is how to structure node and relationships? Should you stick all nodes to the Reference node? Should you group it through a particular node etc? This would be very useful for people coming from RDBMS and other databases to correct the way of thinking. For example, creating users in the system, I want to be able to access those by email or so. So I instead of indexing email field it is recommended (I believe) to make the Users reachable by graph. Thus it should be linked to the Reference node (0). Next question, should you have direct relationship ROOT -users- User or have it through the container node, like ROOT-users- USERS -users- User. I looked at the docs, but couldn't find something like this. Cheers, Dima http://www.ApproachE.com ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] Standalone server and transactions
Hi, 1. DB server must be able to work as standalone server 2. DB server must provide transactions. Can anybody guide me through these 2 things in Neo4j world? 1. Neo4j works as a standalone (or clustered) server which is accessible through the REST API. 2. Neo4j is ACID transactional with each HTTP request to the server being internally scoped in a single transaction. HTH, Jim ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] Named matched with depth gives error
Hi Dima, There's a nightly snapshot that you can grab if you're interested in being on the bleeding edge. It's in the Neo4j repo: http://m2.neo4j.org/ And so the latest Cypher build is here: http://m2.neo4j.org/org/neo4j/neo4j-cypher/1.6-SNAPSHOT/ You can just add a snapshot dependency to your Maven POM/Ivy settings/whatever else to get this automatically as part of your build. Jim ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
[Neo4j] Log message for unmanaged extension
Hi, I tried to debug my unmanaged extension with private static final Logger log = Logger.getLogger(Register.class); and generate a message like: log.warn(passed check point 1); But I couldn't find any these messages from any log files, neo4j.0.0.log, console.log, message.log...etc How should I setup the log message? Regards, Brendan ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] Named matched with depth gives error
download the 1.6 SNAPSHOT from neo4j.org/downloads mobile mail please excuse brevity and typos Am 02.12.2011 um 01:27 schrieb dnagir dna...@gmail.com: I fixed this yesterdayhttps://github.com/neo4j/community/commit/37c2867871c7d953c2021177d0b72cd8ba825be0. Thanks a lot for that. How can I get the build that includes the fix? (Sorry for the question, but just starting with noe4j). Sorry you ran into it... NP. Cheers. -- View this message in context: http://neo4j-community-discussions.438527.n3.nabble.com/Named-matched-with-depth-gives-error-tp3548195p3553337.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] Named matched with depth gives error
Thank Michael, I didn't realise there's snapshot version available from the download page. I prefer downloading the whole package instead of one particular thing, as Jim suggested. But glad to know there's such an option. Cheers. On 02/12/2011, at 5:20 PM, Michael Hunger [via Neo4j Community Discussions] wrote: download the 1.6 SNAPSHOT from neo4j.org/downloads mobile mail please excuse brevity and typos Am 02.12.2011 um 01:27 schrieb dnagir [hidden email]: I fixed this yesterdayhttps://github.com/neo4j/community/commit/37c2867871c7d953c2021177d0b72cd8ba825be0. Thanks a lot for that. How can I get the build that includes the fix? (Sorry for the question, but just starting with noe4j). Sorry you ran into it... NP. Cheers. -- View this message in context: http://neo4j-community-discussions.438527.n3.nabble.com/Named-matched-with-depth-gives-error-tp3548195p3553337.html Sent from the Neo4j Community Discussions mailing list archive at Nabble.com. ___ Neo4j mailing list [hidden email] https://lists.neo4j.org/mailman/listinfo/user ___ Neo4j mailing list [hidden email] https://lists.neo4j.org/mailman/listinfo/user If you reply to this email, your message will be added to the discussion below: http://neo4j-community-discussions.438527.n3.nabble.com/Named-matched-with-depth-gives-error-tp3548195p3553894.html To unsubscribe from Named matched with depth gives error, click here. NAML -- View this message in context: http://neo4j-community-discussions.438527.n3.nabble.com/Named-matched-with-depth-gives-error-tp3548195p3553941.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] Standalone server and transactions
On 02/12/2011, at 4:48 PM, Jim Webber wrote: 1. Neo4j works as a standalone (or clustered) server which is accessible through the REST API. That's the point. There is not standalone version with native bindings. You either run embedded and lock the whole database to the particular app, or you go with REST that doesn't support transactions (batch != transaction)... 2. Neo4j is ACID transactional with each HTTP request to the server being internally scoped in a single transaction. Unfortunately it is not always enough, even when using batch API. Here is the use-case: 1. Query for a nodes/rels. 2. Run some custom logic on the client. 3. Update nodes/rels appropriately. This is the most common way of using databases. And currently it is not possible to wrap it in a transaction. So the only alternative in this case is to use native binding, which may not be available to all. And means we are back at point 1. Do you see what I mean here? It's a trade-off: ACID vs DB with multiple clients. A way of doing transactions over REST would be nice. But it will be extremely hard to implement due to the stateless nature of HTTP. I can see something like this in API: POST /transaction?timeout=2 # Returns the ID of the transaction for the future # then use the normal API... PUT /transactions/1234/commit # or PUT /transactions/1234/rollback # or DESTROY /transactions/1234 # or automatically rollback after 2 secs But I am not sure this can work reliably and performant enough with HTTP. Cheers. ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] Standalone server and transactions
Am 01.12.2011 um 23:03 schrieb zolv: Hi I have read as much I was able to read about Neo4j with the topic I wrote below. My imaginations of DB server (doesn't matter RDBMS or NoSQL) is that the crucial things for DB server is interesting from development point of view are (musts!): 1. DB server must be able to work as standalone server Neo4j comes as stand-alone server accessible via an REST API. You can add other API's on top of the embedded Graph Database yourself by using Plugins / Extensions. 2. DB server must provide transactions. Neo4j is one of the few NOSQL solutions that offers ACID capabilities and transactions. Can anybody guide me through these 2 things in Neo4j world? Ad 1. There are lots of examples to work with Neo4j as embedded. Actually these examples works, I already made some application that was operating quite good (embedded Neo4j was started/stopped by Singleton EJB). The only problem is that I can use DB via application (x)or Neoclipse. Never both at the same time. This is very annoying to stop the app and connect via Neoclipse and vice versa. Neoclipse can access a neo4j-database in readonly mode which is possible at the same time. Ad2. So first thing what I wanted to do was start Neo4j as standalone server. The problem was thtat the only entry point to Neo4j server is...HTTP REST. This lib (as I know) is not managed by Neo4j project/fellows but some external fellow created it. I say - OK, let it What lib are you referring to? A client library? (this one? https://github.com/neo4j/java-rest-binding) There are REST clients for many languages and it is fairly easy to write your own. Still, the solution that is most flexible and performant is either to embed neo4j and expose domain protocol endpoints in your own server or write a server plugin/extension that provides those. be. But the first thing what was written there was transactions are not supported. Only batch operations but from my point of view this is a bit tricky solution for transactions. Each HTTP request is a single transaction. Other approaches that handles transaction over the wire individually and longer running are planned. Am I missing something? I hope I do, because in this situation, Neo4j isn't actually interesting DB server/solution...but I want it to be. I would like to know some more detailed reasons for that, so far we haven't received this kind of response. Thanks a lot Michael Standalone server and transactions or GTFO. Cheers -- View this message in context: http://neo4j-community-discussions.438527.n3.nabble.com/Standalone-server-and-transactions-tp3553058p3553058.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] Standalone server and transactions
No, the alternative there is to provide a server-side extension that encapsulates your business logic as an endpoint running inside of a tx. Cheers Michael Am 02.12.2011 um 08:30 schrieb Dmytrii Nagirniak: On 02/12/2011, at 4:48 PM, Jim Webber wrote: 1. Neo4j works as a standalone (or clustered) server which is accessible through the REST API. That's the point. There is not standalone version with native bindings. You either run embedded and lock the whole database to the particular app, or you go with REST that doesn't support transactions (batch != transaction)... 2. Neo4j is ACID transactional with each HTTP request to the server being internally scoped in a single transaction. Unfortunately it is not always enough, even when using batch API. Here is the use-case: 1. Query for a nodes/rels. 2. Run some custom logic on the client. 3. Update nodes/rels appropriately. This is the most common way of using databases. And currently it is not possible to wrap it in a transaction. So the only alternative in this case is to use native binding, which may not be available to all. And means we are back at point 1. Do you see what I mean here? It's a trade-off: ACID vs DB with multiple clients. A way of doing transactions over REST would be nice. But it will be extremely hard to implement due to the stateless nature of HTTP. I can see something like this in API: POST /transaction?timeout=2 # Returns the ID of the transaction for the future # then use the normal API... PUT /transactions/1234/commit # or PUT /transactions/1234/rollback # or DESTROY /transactions/1234 # or automatically rollback after 2 secs But I am not sure this can work reliably and performant enough with HTTP. 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
