[Neo4j] Cypher: combining results?
Hi, Cypher allows to define multiple starting points. Example: start n=(1, 2, 3) return n (taken from http://docs.neo4j.org/chunked/stable/query-start.html#start-multiple-nodes-by-id) Can this only be done in the START clause or also in the MATCH clause, like this? START principal=node:nodes(NAME='User 3') MATCH (principal)-[:IS_MEMBER_OF*0..1]-()-[:IS_MEMBER_OF*0..]-(n), (n, principal)-[secRel:SECURITY]-(d) RETURN d When I do it as mentioned, I get the following Exception which does not make any sense to me: Exception in thread main org.neo4j.cypher.SyntaxException: Matching nodes without identifiers have to have parenthesis: () What did I do wrong? Thanks, Didi ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] Cypher: combining results?
On Nov 6, 2011 10:55 AM, D. Frej dieter_f...@gmx.net wrote: Hi, Cypher allows to define multiple starting points. Example: start n=(1, 2, 3) return n (taken from http://docs.neo4j.org/chunked/stable/query-start.html#start-multiple-nodes-by-id ) Can this only be done in the START clause or also in the MATCH clause, like this? START principal=node:nodes(NAME='User 3') MATCH (principal)-[:IS_MEMBER_OF*0..1]-()-[:IS_MEMBER_OF*0..]-(n), (n, principal)-[secRel:SECURITY]-(d) RETURN d The problem is the last part of the match, where you have (n,principal). What is it that you are trying to express with that? Andrés ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] Cypher: combining results?
On Sun, Nov 6, 2011 at 12:25 PM, Andres Taylor andres.tay...@neotechnology.com wrote: On Nov 6, 2011 10:55 AM, D. Frej dieter_f...@gmx.net wrote: Hi, Cypher allows to define multiple starting points. Example: start n=(1, 2, 3) return n (taken from http://docs.neo4j.org/chunked/stable/query-start.html#start-multiple-nodes-by-id ) Can this only be done in the START clause or also in the MATCH clause, like this? START principal=node:nodes(NAME='User 3') MATCH (principal)-[:IS_MEMBER_OF*0..1]-()-[:IS_MEMBER_OF*0..]-(n), (n, principal)-[secRel:SECURITY]-(d) RETURN d The problem is the last part of the match, where you have (n,principal). What is it that you are trying to express with that? Well, to be truthful about it - the stupid exception is also a problem. It's been nagging me for some time, Cypher's syntax checking is not what I would like it to be. Sorry about that... Andrés ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] Cypher: combining results?
I have a very simply graph: UserGroup 2 -[:IS_MEMBER_OF]- UserGroup 1, User 3 UserGroup 1 -[:IS_MEMBER_OF]- User 1, User 2 And I am trying to get all nodes that are on the same level and below the starting point including the starting point. This works for, e.g. User 3, but not for UserGroup2. The cypher is used is the one presented. Since I cannot get the starting point included, I tried to do this combining thing for the further matching. Am 06.11.2011 12:25, schrieb Andres Taylor: On Nov 6, 2011 10:55 AM, D. Frejdieter_f...@gmx.net wrote: Hi, Cypher allows to define multiple starting points. Example: start n=(1, 2, 3) return n (taken from http://docs.neo4j.org/chunked/stable/query-start.html#start-multiple-nodes-by-id ) Can this only be done in the START clause or also in the MATCH clause, like this? START principal=node:nodes(NAME='User 3') MATCH (principal)-[:IS_MEMBER_OF*0..1]-()-[:IS_MEMBER_OF*0..]-(n), (n, principal)-[secRel:SECURITY]-(d) RETURN d The problem is the last part of the match, where you have (n,principal). What is it that you are trying to express with that? Andrés ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] Cypher: combining results?
Andrés, is there an official grammar for e.g. antlr or JavaCC for cypher syntax? Am 06.11.2011 15:11, schrieb Andres Taylor: On Sun, Nov 6, 2011 at 12:25 PM, Andres Taylor andres.tay...@neotechnology.com wrote: On Nov 6, 2011 10:55 AM, D. Frejdieter_f...@gmx.net wrote: Hi, Cypher allows to define multiple starting points. Example: start n=(1, 2, 3) return n (taken from http://docs.neo4j.org/chunked/stable/query-start.html#start-multiple-nodes-by-id ) Can this only be done in the START clause or also in the MATCH clause, like this? START principal=node:nodes(NAME='User 3') MATCH (principal)-[:IS_MEMBER_OF*0..1]-()-[:IS_MEMBER_OF*0..]-(n), (n, principal)-[secRel:SECURITY]-(d) RETURN d The problem is the last part of the match, where you have (n,principal). What is it that you are trying to express with that? Well, to be truthful about it - the stupid exception is also a problem. It's been nagging me for some time, Cypher's syntax checking is not what I would like it to be. Sorry about that... Andrés ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] REST api get list of all relationship properties (unique)
Hi Peter, sounds good, I'll check how to contribute.. Meanwhile I was working on the original question of the thread - getting a list of unique properties used in the relationships. Since the lucene indexer in neo4j always uses nodes or relationships, I don't see a way to extract a list of relationship poperties, without retrieving all relationships as well (e.g. 1M relationships with 5 different properties), which could result in bad performance. Did I overlook something? The other option would be a separate key-value-store or lucene index, but I would like to keep only neo4j as persistence.. The use-case is an UI to create a relationship with auto-complete on existing properties. Regards, Jure -- View this message in context: http://neo4j-community-discussions.438527.n3.nabble.com/REST-api-get-list-of-all-relationship-properties-unique-tp3458852p3484986.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] Property loading in Neo4J 1.4
If a node is accessed, are *all* of its properties loaded into memory? Thanks, Rick ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] SDG 2.0.0.M1 cross-store does not work properly
Hi Michael, thanks a lot for you fast response. I run the tests against SNAPSHOT and it works. I had also problems with mapping of enums and it works either now. Great job! thanks a lot. BTW: Could you point any docs or examples how to use alternative non-aspectj mapping approach, maybe this approach will hell solve the problem with serializing of domain object. Currently invoking persist() on deserialized object causes NPE, which is pretty problematic when working with wicket. Thanks a lot in advance Greets, Marcin -- View this message in context: http://neo4j-community-discussions.438527.n3.nabble.com/SDG-2-0-0-M1-cross-store-does-not-work-properly-tp3481372p3485361.html Sent from the Neo4j Community Discussions mailing list archive at Nabble.com. ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] Neo4j performance with 400million nodes
Hi alican, I just want to report back that I was able to reproduce the problem and narrow down the cause a bit. Seems the UI and DB threads are waiting for each other ... haven't got around to fix it though. /anders 2011-11-02 07:08, algecya skrev: Hi anders, appreciate your offer very much! It is good to know that the neo4j community is very active and involved. http://neo4j-community-discussions.438527.n3.nabble.com/file/n3472966/BatchImportData.groovy BatchImportData.groovy Here is the import script. it is a stripped version of the graph I used for testing. If you need more data, just increase the variable 'amountTypeA' at line 26. -- alican -- View this message in context: http://neo4j-community-discussions.438527.n3.nabble.com/Neo4j-performance-with-400million-nodes-tp3467806p3472966.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] SDG 2.0.0.M1 cross-store does not work properly
There is are two examples in the current snapshot, hello-worlds and cineasts (w/o -*) Could you share the use-case + NPE that you've described? Thanks a lot Michael mh$ ls -1 spring-data-neo4j-examples/ cineasts [x] cineasts-aspects cineasts-rest hello-worlds [x] hello-worlds-aspects imdb myrestaurants-original myrestaurants-social Am 06.11.2011 um 22:33 schrieb Marcin Zasepa: Hi Michael, thanks a lot for you fast response. I run the tests against SNAPSHOT and it works. I had also problems with mapping of enums and it works either now. Great job! thanks a lot. BTW: Could you point any docs or examples how to use alternative non-aspectj mapping approach, maybe this approach will hell solve the problem with serializing of domain object. Currently invoking persist() on deserialized object causes NPE, which is pretty problematic when working with wicket. Thanks a lot in advance Greets, Marcin -- View this message in context: http://neo4j-community-discussions.438527.n3.nabble.com/SDG-2-0-0-M1-cross-store-does-not-work-properly-tp3481372p3485361.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] Gremlin - how to flatten a tree, and sort
Marko, And I'm saying nasty with a South African accent so you know its dirty. Thanks to working with Romiko, I'm getting an eerily clear mental image of that. -- Tatham ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] Neo4j performance with 400million nodes
anders, thank you very much for reporting back and looking at it! Good luck fixing the bug then -- alican -- View this message in context: http://neo4j-community-discussions.438527.n3.nabble.com/Neo4j-performance-with-400million-nodes-tp3467806p3486237.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
