Re: [Neo4j] IndexHits extends Iterable is evil
That indeed is evil, JP.
Could you raise an issue on this please? Please copy even your
explanation in there. Fully agree.
Cheers,
/peter neubauer
TC CEO of the year - vote for Emil Eifrém!
http://crunchies2011.techcrunch.com/nominate/
Google:neubauer.peter
Skype:peter.neubauer
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brew install neo4j neo4j start
heroku addons:add neo4j
On Fri, Dec 9, 2011 at 4:02 PM, Jean-Pierre Bergamin
jpberga...@gmail.com wrote:
Dear neo4j community and developers
For the second time we stumbled about Iterables that are no Iterables
in Neo4j. IndexHits e.g. extends Iterator and Iterable and states in
its documentation that is not really an iterable but always returns
this in calls to iterator(). So far so good.
Now when using Spring Data Neo4j, the IndexHits is wrapped and hidden
behind ClosableIterable and IterableAdapter etc. The user has no idea
anymore that those IterableWrapper and ClosableIterable things he gets
back are no iterables at all - well the names tell him of course that
those things *are* Iterables. This leads to very, very strange
behaviour like this:
@Test
public void ouch() {
Device d1 = new Device(d1).persist();
Device d2 = new Device(d2).persist();
ClosableIterableDevice devices = deviceRepository().findAll();
assertThat(devices, hasItems(d1));
assertEquals(1, IteratorUtil.count(devices));
}
We add two devices to our DB, but the test clearly states that
findAll() only returns one (assertEquals(1,
IteratorUtil.count(devices))).
As an exercise for the reader: explain why this test misleads you
Iterable should always return a valid iterator for every call to
iterator(). Implementing Iterable just to be able to use an iterator
in a for loop is evil. :-)
Best regards,
James
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Re: [Neo4j] HA starting issue
It seems that ZooKeeper configuration could be invalid. The HA db doesn't get in contact with it. 2011/12/6 lawrence.bandeira lawrence.bande...@gmail.com Follow the logs !!! http://neo4j-community-discussions.438527.n3.nabble.com/file/n3565025/console.log console.log http://neo4j-community-discussions.438527.n3.nabble.com/file/n3565025/neo4j.0.0.log neo4j.0.0.log http://neo4j-community-discussions.438527.n3.nabble.com/file/n3565025/neo4j-zookeeper.log neo4j-zookeeper.log -- View this message in context: http://neo4j-community-discussions.438527.n3.nabble.com/Neo4j-HA-starting-issue-tp3260535p3565025.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 -- Mattias Persson, [matt...@neotechnology.com] Hacker, Neo Technology www.neotechnology.com ___ NOTICE: THIS MAILING LIST IS BEING SWITCHED TO GOOGLE GROUPS, please register and consider posting at https://groups.google.com/forum/#!forum/neo4j Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] NeoEclipse overlapping relations
You can choose to hide certain relationship types in some menu somewhere... But in general overlapping relationships is a problem in Neoclipse I think 2011/12/7 nrkkalyan nrkkal...@gmail.com I would like to know if there is a way to see the relations on neoeclipse propertly, I created a family relation and tried to view the relation in neoeclipse, but it seems the relations are been overlapped. Image: http://neo4j-community-discussions.438527.n3.nabble.com/file/n3565999/neo4j-family-relation.png Am I doing something missing in settings? -- View this message in context: http://neo4j-community-discussions.438527.n3.nabble.com/NeoEclipse-overlapping-relations-tp3565999p3565999.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 -- Mattias Persson, [matt...@neotechnology.com] Hacker, Neo Technology www.neotechnology.com ___ NOTICE: THIS MAILING LIST IS BEING SWITCHED TO GOOGLE GROUPS, please register and consider posting at https://groups.google.com/forum/#!forum/neo4j Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] allSimplePaths performance
Hey folks, just wanted to let you know that I tested it with Neo4j Community 1.6M01 and can't reproduce the problem. It seems that it got fixed somewhere along the way. :) Iterating through the depth levels and calling pathsWithLength is still faster than allSimplePaths for depths 5 for me, so I'm going to stick to it. Even wrote a small plugin for my server to do that. Thanks a lot for the great work! 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 ___ NOTICE: THIS MAILING LIST IS BEING SWITCHED TO GOOGLE GROUPS, please register and consider posting at https://groups.google.com/forum/#!forum/neo4j Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] allSimplePaths performance
Cool. Got that plugin somewhere? Cheers, /peter neubauer TC CEO of the year - vote for Emil Eifrém! http://crunchies2011.techcrunch.com/nominate/ Google:neubauer.peter Skype:peter.neubauer Phone: +46 704 106975 LinkedIn http://www.linkedin.com/in/neubauer Twitter @peterneubauer brew install neo4j neo4j start heroku addons:add neo4j On Tue, Dec 13, 2011 at 4:52 PM, Petar Dobrev petar.dob...@myphilanthropedia.org wrote: Hey folks, just wanted to let you know that I tested it with Neo4j Community 1.6M01 and can't reproduce the problem. It seems that it got fixed somewhere along the way. :) Iterating through the depth levels and calling pathsWithLength is still faster than allSimplePaths for depths 5 for me, so I'm going to stick to it. Even wrote a small plugin for my server to do that. Thanks a lot for the great work! 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 ___ NOTICE: THIS MAILING LIST IS BEING SWITCHED TO GOOGLE GROUPS, please register and consider posting at https://groups.google.com/forum/#!forum/neo4j Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user ___ NOTICE: THIS MAILING LIST IS BEING SWITCHED TO GOOGLE GROUPS, please register and consider posting at https://groups.google.com/forum/#!forum/neo4j Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] allSimplePaths performance
Sure, it's based on the shortestPath plugin example from the docs and is quite simple: https://gist.github.com/1472918 Best regards, Petar On Tue, Dec 13, 2011 at 5:58 PM, Peter Neubauer peter.neuba...@neotechnology.com wrote: Cool. Got that plugin somewhere? Cheers, /peter neubauer TC CEO of the year - vote for Emil Eifrém! http://crunchies2011.techcrunch.com/nominate/ Google:neubauer.peter Skype:peter.neubauer Phone: +46 704 106975 LinkedIn http://www.linkedin.com/in/neubauer Twitter @peterneubauer brew install neo4j neo4j start heroku addons:add neo4j On Tue, Dec 13, 2011 at 4:52 PM, Petar Dobrev petar.dob...@myphilanthropedia.org wrote: Hey folks, just wanted to let you know that I tested it with Neo4j Community 1.6M01 and can't reproduce the problem. It seems that it got fixed somewhere along the way. :) Iterating through the depth levels and calling pathsWithLength is still faster than allSimplePaths for depths 5 for me, so I'm going to stick to it. Even wrote a small plugin for my server to do that. Thanks a lot for the great work! 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 ___ NOTICE: THIS MAILING LIST IS BEING SWITCHED TO GOOGLE GROUPS, please register and consider posting at https://groups.google.com/forum/#!forum/neo4j Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user ___ NOTICE: THIS MAILING LIST IS BEING SWITCHED TO GOOGLE GROUPS, please register and consider posting at https://groups.google.com/forum/#!forum/neo4j Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user -- Petar Dobrev Engineer Philanthropedia http://www.myphilanthropedia.org ___ NOTICE: THIS MAILING LIST IS BEING SWITCHED TO GOOGLE GROUPS, please register and consider posting at https://groups.google.com/forum/#!forum/neo4j Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
[Neo4j] Neo4j Events this Week
Hi all! Here are the events Neo4j has this week. ** https://www1.gotomeeting.com/register/465612737*Webinar | Getting Started with Spring Data Neo4j* Thursday, December 15, 2011, 10:00 PST The Spring Data project makes it easier to build Spring-powered applications that use new data access technologies such as non-relational NOSQL databases, cloud based data services, and graph databases. This webinar is designed for enterprise developers who are working with Spring and need to understand if they can benefit from a graph database. The session will introduce the different types of data management offered in Spring Data, including graph databases, and will show how easy it is to get started with the Spring Data Neo4j project. *Sydney Tutorial: Neo4j and Graph Databases*http://www.yowconference.com.au/YOW2011/general/workshopDetails.html?eventId=3488 Thursday, December 15, 2011 Graph databases like Neo4j are an esoteric and powerful member of the NOSQL family. For highly connected data, graph databases can be thousands of times faster than relational databases, making Neo4j popular for managing complex data across many domains from finance to social, and telecoms to geospatial. This is a (completely open-source) tutorial that provides an intensive mixture of theory and hands-on practical sessions to demonstrate the capabilities of graph data and the popular open source Neo4j graph database. *Sydney Tutorial: REST in Practice*http://www.yowconference.com.au/YOW2011/general/workshopDetails.html?eventId=3464 Friday, December 16, 2011 The Web is fast becoming a serious competitor to traditional enterprise architecture approaches. This tutorial will provide an introduction to RESTful Web Service techniques, both from a theoretical and practical perspectives. Laters @ayeeson * * ___ NOTICE: THIS MAILING LIST IS BEING SWITCHED TO GOOGLE GROUPS, please register and consider posting at https://groups.google.com/forum/#!forum/neo4j Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] KeyError in python
I tried again to run the program and still got the same error, at the same point. I'm running it on Ubuntu 10.10, but I could try on a pc with Windows 7 and more RAM. Cheers, Jacopo ___ NOTICE: THIS MAILING LIST IS BEING SWITCHED TO GOOGLE GROUPS, please register and consider posting at https://groups.google.com/forum/#!forum/neo4j Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] ODBC connection
Rickard, didn't you write a JDBC driver for Cypher recently? 2011/12/7 patenlee leo.de.vr...@bpsolutions.nl I want to access from an external application Neo4j objects. Does anybody know if a Neo4J ODBC driver is available to access the Neo4j objects. -- View this message in context: http://neo4j-community-discussions.438527.n3.nabble.com/ODBC-connection-tp3566658p3566658.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 -- Mattias Persson, [matt...@neotechnology.com] Hacker, Neo Technology www.neotechnology.com ___ NOTICE: THIS MAILING LIST IS BEING SWITCHED TO GOOGLE GROUPS, please register and consider posting at https://groups.google.com/forum/#!forum/neo4j Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] ODBC connection
Hi, Yes, I have written an experimental JDBC driver that uses the REST API to map JDBC calls to Cypher. It is available at: http://github.com/rickardoberg/neo4j-jdbc This can be used to access Neo4j data. Since Cypher does not yet support updates this is read-only, but can be good for reporting purposes. I have so far tested it with DbVisualizer and LibreOffice/OpenOffice, and it works there (the driver has quirks mode for each of these to translate the standard SQL calls these tools make into Cypher). I have also packaged the driver as an applet so that it can be used from Javascript in an HTML page: https://github.com/rickardoberg/neo4j-jdbc-applet With example: https://github.com/rickardoberg/neo4j-jdbc-web These were done yesterday, so not yet production ready, but feel free to try it out and provide feedback. This allows Neo4j to be accessed by tools that support JDBC, but not ODBC. I'm trying to find out if there's a way to do it (the standard JDBC/ODBC bridge does it in the other direction), but have little hope that it can be done easily. What is the tool that you want to use to access Neo4j from, and does it only support ODBC, or would JDBC be fine? /Rickard On Wed, Dec 14, 2011 at 6:44 AM, Mattias Persson matt...@neotechnology.com wrote: Rickard, didn't you write a JDBC driver for Cypher recently? 2011/12/7 patenlee leo.de.vr...@bpsolutions.nl I want to access from an external application Neo4j objects. Does anybody know if a Neo4J ODBC driver is available to access the Neo4j objects. -- View this message in context: http://neo4j-community-discussions.438527.n3.nabble.com/ODBC-connection-tp3566658p3566658.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 -- Mattias Persson, [matt...@neotechnology.com] Hacker, Neo Technology www.neotechnology.com ___ NOTICE: THIS MAILING LIST IS BEING SWITCHED TO GOOGLE GROUPS, please register and consider posting at https://groups.google.com/forum/#!forum/neo4j Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] ODBC connection
Hi, Sooo, I had a look at ODBC, and there is actually a ODBC-JDBC Gateway available from here: http://www.easysoft.com/products/data_access/jdbc_odbc_bridge/index.html I downloaded and installed it, and then tried out a generic ODBC tool with it: http://www.sliksoftware.co.nz/products/odbcview/ With this I could set up a Neo4j ODBC source in Windows, and send Cypher requests to a Neo4j Server and view that as a table in the tool. So, that chain actually works. But I think it is entirely dependent on what ODBC client you want to use, as I'm sure each and every one of them will do slightly different calls. So if you can let me know maybe I can test whichever you are interested in, to see if it works. I am actually able to remote debug the driver to see what is going on, so that is pretty simple. regards, Rickard On Wed, Dec 14, 2011 at 10:26 AM, Rickard Öberg rickard.ob...@neotechnology.com wrote: Hi, Yes, I have written an experimental JDBC driver that uses the REST API to map JDBC calls to Cypher. It is available at: http://github.com/rickardoberg/neo4j-jdbc This can be used to access Neo4j data. Since Cypher does not yet support updates this is read-only, but can be good for reporting purposes. I have so far tested it with DbVisualizer and LibreOffice/OpenOffice, and it works there (the driver has quirks mode for each of these to translate the standard SQL calls these tools make into Cypher). I have also packaged the driver as an applet so that it can be used from Javascript in an HTML page: https://github.com/rickardoberg/neo4j-jdbc-applet With example: https://github.com/rickardoberg/neo4j-jdbc-web These were done yesterday, so not yet production ready, but feel free to try it out and provide feedback. This allows Neo4j to be accessed by tools that support JDBC, but not ODBC. I'm trying to find out if there's a way to do it (the standard JDBC/ODBC bridge does it in the other direction), but have little hope that it can be done easily. What is the tool that you want to use to access Neo4j from, and does it only support ODBC, or would JDBC be fine? /Rickard On Wed, Dec 14, 2011 at 6:44 AM, Mattias Persson matt...@neotechnology.com wrote: Rickard, didn't you write a JDBC driver for Cypher recently? 2011/12/7 patenlee leo.de.vr...@bpsolutions.nl I want to access from an external application Neo4j objects. Does anybody know if a Neo4J ODBC driver is available to access the Neo4j objects. -- View this message in context: http://neo4j-community-discussions.438527.n3.nabble.com/ODBC-connection-tp3566658p3566658.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 -- Mattias Persson, [matt...@neotechnology.com] Hacker, Neo Technology www.neotechnology.com ___ NOTICE: THIS MAILING LIST IS BEING SWITCHED TO GOOGLE GROUPS, please register and consider posting at https://groups.google.com/forum/#!forum/neo4j Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
