Re: [Neo4j] Neoclipse - a lot of NullPointerException windows 1.4.1 Win7 64bit
Jack, are you opening an existing store, and, if so, what Neo4j version was that store created with? 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 http://www.neo4j.org - Your high performance graph database. http://startupbootcamp.org/ - Öresund - Innovation happens HERE. http://www.thoughtmade.com - Scandinavia's coolest Bring-a-Thing party. On Wed, Oct 12, 2011 at 5:31 PM, Jack Beauregard jbeauregard...@gmail.com wrote: Hello all, If I start Neoclipse an use a internal db in ro mode I get a lot of NullPointerException windows wth the title error retriving relationships. The same thing when I click a node. Maybe I need a lib or anything else Thank you for any hints. Best regards Jack Win7 64bit Neoclipse 1.4.1 64bit java version 1.6.0_25 Java(TM) SE Runtime Environment (build 1.6.0_25-b06) Java HotSpot(TM) 64-Bit Server VM (build 20.0-b11, mixed mode) ___ 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] Online backups for single instance using community edition
Johannes, if you can make sure that no transaction are in progress, then copying files should work, too. Would that help? You could for instance for a brief period block mutating requests to your webservice, commit all transactions and copy the store files. 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 http://www.neo4j.org - Your high performance graph database. http://startupbootcamp.org/ - Öresund - Innovation happens HERE. http://www.thoughtmade.com - Scandinavia's coolest Bring-a-Thing party. On Wed, Oct 12, 2011 at 11:43 AM, Haensel thehaen...@gmail.com wrote: Hi, I am using the neo4j community edition in a PHP webapp that I am currently developing and found it to be a really cool solution for my project. It is a small project and I am just a single guy developing it so I am nowhere near needing HA or sharding capabilities. Here is the problem I see with neo4j in any form of webapp (SaaS): To be able to create an online backup you'll have to use the enterprise edition (=2000 dollars a month) or you are forced to shutdown the service for a short period of time (most likely multiple times per day) which can be an absolute no-go for a webapp. So my question is: Is there another method of doing an online backup for a single neo4j instance? I thought about traversing the whole graph and creating a second graph filled with the result. I could then shutdown the second instance and just backup the files old school style. This sounds super ugly, but maybe it is a way to think about. I am fine with solutions that would require some additional developing. If the only solution is to use the enterprise edition than I would highly suggest some alternative ways for the next neo4j releases as this would prevent a lot of webdevelopers from using the product. It would be nice to have a way to do online backups for a single instance only so the benefits of the advanced and enterprise editions would still exist. Anyways, thanks for your time and answers Greetings from Austria, Hannes -- View this message in context: http://neo4j-community-discussions.438527.n3.nabble.com/Online-backups-for-single-instance-using-community-edition-tp3415246p3415246.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] Neoclipse - a lot of NullPointerException windows 1.4.1 Win7 64bit
Hello Peter, thy for responding. We are using v1.3 in our software. I tried all versions of Neoclipse. The described behaviour is about 1.4.1. Of course, I should use a corresponding version, but Neoclipse 1.3.0 does not com up: / !SESSION 2011-10-13 10:04:27.181 --- eclipse.buildId=unknown java.version=1.6.0_25 java.vendor=Sun Microsystems Inc. BootLoader constants: OS=win32, ARCH=x86_64, WS=win32, NL=de_CH Command-line arguments: -os win32 -ws win32 -arch x86_64 !ENTRY org.eclipse.osgi 4 0 2011-10-13 10:04:28.138 !MESSAGE Bundle org.eclipse.equinox.transforms.hook@4 not found. !ENTRY org.eclipse.osgi 4 0 2011-10-13 10:04:28.609 !MESSAGE An error occurred while automatically activating bundle org.neo4j.neoclipse (83). !STACK 0 org.osgi.framework.BundleException: Exception in org.neo4j.neoclipse.Activator.start() of bundle org.neo4j.neoclipse. / Best regards Werner On Thu, Oct 13, 2011 at 9:56 AM, Peter Neubauer peter.neuba...@neotechnology.com wrote: Jack, are you opening an existing store, and, if so, what Neo4j version was that store created with? 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 http://www.neo4j.org - Your high performance graph database. http://startupbootcamp.org/ - Öresund - Innovation happens HERE. http://www.thoughtmade.com - Scandinavia's coolest Bring-a-Thing party. On Wed, Oct 12, 2011 at 5:31 PM, Jack Beauregard jbeauregard...@gmail.com wrote: Hello all, If I start Neoclipse an use a internal db in ro mode I get a lot of NullPointerException windows wth the title error retriving relationships. The same thing when I click a node. Maybe I need a lib or anything else Thank you for any hints. Best regards Jack Win7 64bit Neoclipse 1.4.1 64bit java version 1.6.0_25 Java(TM) SE Runtime Environment (build 1.6.0_25-b06) Java HotSpot(TM) 64-Bit Server VM (build 20.0-b11, mixed mode) ___ 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] Neoclipse - a lot of NullPointerException windows 1.4.1 Win7 64bit
Mmh, any chance of upgrading Neo4j to 1.4.2 and running Neoclipse 1.4.1 against it? Can also try to see if I can get Neoclipse 1.3.0 up on a windows machine ... 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 http://www.neo4j.org - Your high performance graph database. http://startupbootcamp.org/ - Öresund - Innovation happens HERE. http://www.thoughtmade.com - Scandinavia's coolest Bring-a-Thing party. On Thu, Oct 13, 2011 at 10:12 AM, Jack Beauregard jbeauregard...@gmail.com wrote: Hello Peter, thy for responding. We are using v1.3 in our software. I tried all versions of Neoclipse. The described behaviour is about 1.4.1. Of course, I should use a corresponding version, but Neoclipse 1.3.0 does not com up: / !SESSION 2011-10-13 10:04:27.181 --- eclipse.buildId=unknown java.version=1.6.0_25 java.vendor=Sun Microsystems Inc. BootLoader constants: OS=win32, ARCH=x86_64, WS=win32, NL=de_CH Command-line arguments: -os win32 -ws win32 -arch x86_64 !ENTRY org.eclipse.osgi 4 0 2011-10-13 10:04:28.138 !MESSAGE Bundle org.eclipse.equinox.transforms.hook@4 not found. !ENTRY org.eclipse.osgi 4 0 2011-10-13 10:04:28.609 !MESSAGE An error occurred while automatically activating bundle org.neo4j.neoclipse (83). !STACK 0 org.osgi.framework.BundleException: Exception in org.neo4j.neoclipse.Activator.start() of bundle org.neo4j.neoclipse. / Best regards Werner On Thu, Oct 13, 2011 at 9:56 AM, Peter Neubauer peter.neuba...@neotechnology.com wrote: Jack, are you opening an existing store, and, if so, what Neo4j version was that store created with? 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 http://www.neo4j.org - Your high performance graph database. http://startupbootcamp.org/ - Öresund - Innovation happens HERE. http://www.thoughtmade.com - Scandinavia's coolest Bring-a-Thing party. On Wed, Oct 12, 2011 at 5:31 PM, Jack Beauregard jbeauregard...@gmail.com wrote: Hello all, If I start Neoclipse an use a internal db in ro mode I get a lot of NullPointerException windows wth the title error retriving relationships. The same thing when I click a node. Maybe I need a lib or anything else Thank you for any hints. Best regards Jack Win7 64bit Neoclipse 1.4.1 64bit java version 1.6.0_25 Java(TM) SE Runtime Environment (build 1.6.0_25-b06) Java HotSpot(TM) 64-Bit Server VM (build 20.0-b11, mixed mode) ___ 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] Mapping domain graph to spatial layer
Marcin, look at https://github.com/neo4j/spatial/blob/master/src/test/java/org/neo4j/gis/spatial/TestSimplePointLayer.java#L42 where data is added to the SimplePointLayer, specifying that the lat/lon should be encoded into Longitude/Latitude properties on the geometry node. For adding existing data to the layer, look at https://github.com/neo4j/spatial/blob/master/src/main/java/org/neo4j/gis/spatial/server/plugin/SpatialPlugin.java#L98 - you are adding an existing node with the right lon/lat properties to the layer, using the specified GeometryEncoder at Layer setup time. I did an example of this in the functional tests, see https://github.com/neo4j/spatial/blob/master/features/start-and-stop.feature#L10 where a layer is created (assuming lon/lat/bbox per default as the geometry nodes properties to be used for indexing, then a raw node is created, then the nodes is added to the layer and indexed, and then you can search for it in different permutations (REST, Gremlin, Cypher, Neo4j Index) Does that help? 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 http://www.neo4j.org - Your high performance graph database. http://startupbootcamp.org/ - Öresund - Innovation happens HERE. http://www.thoughtmade.com - Scandinavia's coolest Bring-a-Thing party. On Tue, Oct 11, 2011 at 6:59 PM, Marcin Zpa se...@vp.pl wrote: Hi Peter, thanks a lot for your quick feedback. What do you mean with skipping encoding step? That means that i could directly index my domain coordinate node and do not create any additional geo nodes. Sorry if you find this question stupid or obvious but i cant follow your suggestion. For me important thing is that after invoking search i want to somehow get back from results provided as SpatialDatabaserecord to domain nodes as for example user. Thanks in advance! -- View this message in context: http://neo4j-community-discussions.438527.n3.nabble.com/Mapping-domain-graph-to-spatial-layer-tp3409159p3413184.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] Online backups for single instance using community edition
I thought about that, yes, but I think it can easily become tricky in my
case. If it is the only way than I have to do some magic at the application
layer to tell users that they currently can't post comments but the read
access would be vital.
What about exporting a graph with g.saveGraphGML('backuped.xml')? I could do
this by using curl to post to the gremlin plugin but I am not quite sure how
this is implemented yet. I assume it creates a snapshot of the current graph
without including non finished transactions (which would be fine). If
anything happens to the db I'll read in the exported file again. Is this a
considerable way of solving the issue (for moderately sized graphs) or am I
missing something obvious?
Greetings,
Hannes
--
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Re: [Neo4j] Open Data Sets?
Very nice, Andreas, could you see if we can put it up at the neo4j dataset site? And provide a public link to it ... 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 http://www.neo4j.org - Your high performance graph database. http://startupbootcamp.org/ - Öresund - Innovation happens HERE. http://www.thoughtmade.com - Scandinavia's coolest Bring-a-Thing party. On Thu, Sep 29, 2011 at 7:33 PM, Jacopo Farina jacopo1.far...@gmail.com wrote: Thanks a lot for the datasets! I created a graph with English Wikipedia pages and category names and relationships, starting from the .sql files available on the wikimedia site http://dumps.wikimedia.org/backup-index.html The resulting graph is about 3GB of size, so I can't easily distribute it, but the code is trivial, feel free to use it: http://pastebin.com/mj3bkDmZ It contains an utility class to read the file line per line, I'm sorry for the comments in Italian. The program avoids to load most of the stub or redirect categories, the execution should last 5-7 hours. Cheers, Jacopo Farina 2011/9/29 Peter Neubauer peter.neuba...@neotechnology.com Rene, that would be very cool to make available, thanks for sharing! 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 http://www.neo4j.org - Your high performance graph database. http://startupbootcamp.org/ - Öresund - Innovation happens HERE. http://www.thoughtmade.com - Scandinavia's coolest Bring-a-Thing party. 2011/9/29 René Pickhardt r.pickha...@googlemail.com: I recently made a blog article on a data source for 119 network graphs. http://www.rene-pickhardt.de/download-network-graph-data-sets-from-konect-the-koblenz-network-colection/ I also post new data sets in the dataset category of my blog: http://www.rene-pickhardt.de/cat/data/data-sets/ Have fun. Soon i will make available a social network graph extracted from wikipedia. Am 29.09.2011 00:09 schrieb McKinley mckinley1...@gmail.com: I want to create some demos of relational database extraction into Neo4j but I cannot share the data I use with the public. I know there are several resources for open data sets on the net, but has anyone on the list already found a nice, large data set that you are happy with? Thanks, McKinley ___ 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 ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
[Neo4j] WebAdmin visualization tool for large DB ?
Hi, I was looking for a way to visualize and interact with small subsets of large Neo4j databases, *(somehow* *navigating through the data in order to have a general idea of how things are organized at specific parts* *of my DB)*. So before starting to create my own solution to that, I'd like to know which are the limits/constraints of the new WebAdmin tool ?* (in terms of number of rels/nodes in the neighborhood/ total DB)* Thanks, Pablo -- Pablo Pareja Tobes My site http://about.me/pablopareja LinkedInhttp://www.linkedin.com/in/pabloparejatobes Twitter http://www.twitter.com/pablopareja Creator of Bio4j -- http://www.bio4j.com http://www.ohnosequences.com ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
[Neo4j] Size limits for REST Server?
Hi, I'd like to know which are the limits in terms of number of nodes/relationships, topology *(e.g. supernodes* *with millions of incoming/outgoing relationship in the same node)* for Neo4j REST-Server? Has it already been used for large DB / BigData ? Otherwise, is there anyway to tune the core functionality so that fetching methods for specific kind of nodes/rels/situations can be overwritten ? Cheers, Pablo -- Pablo Pareja Tobes My site http://about.me/pablopareja LinkedInhttp://www.linkedin.com/in/pabloparejatobes Twitter http://www.twitter.com/pablopareja Creator of Bio4j -- http://www.bio4j.com http://www.ohnosequences.com ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] Size limits for REST Server?
Hi Pablo, For the very specific use-cases I'd recommend writing an extension rather than using the default representations. The default behaviour of the REST API emphasises discoverability which in the case of supernodes isn't usually desirable. Jim ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] Size limits for REST Server?
Hi Jim, What do you exactly mean by discoverability ? Always getting all in/out rels for a node? About writing an extension, has anyone already done this at some level? Is there any kind of docs about this? And lastly (I just realized I only asked more questions so far... ) is the REST-Server somehow prepared for these extensions? I mean, could I use the 'skeleton' of the Server and only change some parts in order to get all this? Thanks! Pablo On Thu, Oct 13, 2011 at 4:32 PM, Jim Webber j...@neotechnology.com wrote: Hi Pablo, For the very specific use-cases I'd recommend writing an extension rather than using the default representations. The default behaviour of the REST API emphasises discoverability which in the case of supernodes isn't usually desirable. Jim ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user -- Pablo Pareja Tobes My site http://about.me/pablopareja LinkedInhttp://www.linkedin.com/in/pabloparejatobes Twitter http://www.twitter.com/pablopareja Creator of Bio4j -- http://www.bio4j.com http://www.ohnosequences.com ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] Size limits for REST Server?
Pablo, find docs about unmanaged extensions here: http://docs.neo4j.org/chunked/snapshot/server-unmanaged-extensions.html and an example is the clean-db extension by Michael Hunger, see https://github.com/jexp/neo4j-clean-remote-db-addon as an example. Does that help? 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 http://www.neo4j.org - Your high performance graph database. http://startupbootcamp.org/ - Öresund - Innovation happens HERE. http://www.thoughtmade.com - Scandinavia's coolest Bring-a-Thing party. On Thu, Oct 13, 2011 at 5:04 PM, Pablo Pareja ppar...@era7.com wrote: Hi Jim, What do you exactly mean by discoverability ? Always getting all in/out rels for a node? About writing an extension, has anyone already done this at some level? Is there any kind of docs about this? And lastly (I just realized I only asked more questions so far... ) is the REST-Server somehow prepared for these extensions? I mean, could I use the 'skeleton' of the Server and only change some parts in order to get all this? Thanks! Pablo On Thu, Oct 13, 2011 at 4:32 PM, Jim Webber j...@neotechnology.com wrote: Hi Pablo, For the very specific use-cases I'd recommend writing an extension rather than using the default representations. The default behaviour of the REST API emphasises discoverability which in the case of supernodes isn't usually desirable. Jim ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user -- Pablo Pareja Tobes My site http://about.me/pablopareja LinkedIn http://www.linkedin.com/in/pabloparejatobes Twitter http://www.twitter.com/pablopareja Creator of Bio4j -- http://www.bio4j.com http://www.ohnosequences.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 Cookbook in the making
Hi all, just started a Cypher Cookbook, if you are interested - http://docs.neo4j.org/chunked/snapshot/cypher-cookbook.html Feel free to raise issues or comment via Disqus on stuff you wanna see in there, and we can add it. Happy coding! /peter neubauer GTalk: neubauer.peter Skype peter.neubauer Phone +46 704 106975 LinkedIn http://www.linkedin.com/in/neubauer Twitter http://twitter.com/peterneubauer http://www.neo4j.org - Your high performance graph database. http://startupbootcamp.org/ - Öresund - Innovation happens HERE. http://www.thoughtmade.com - Scandinavia's coolest Bring-a-Thing party. ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] Size limits for REST Server?
Hi Pablo, What do you exactly mean by discoverability ? Always getting all in/out rels for a node? Yup, exactly. By default the REST server projects the graph (naively) onto the Web (itself a graph). About writing an extension, has anyone already done this at some level? Is there any kind of docs about this? Yes, and I just noticed Peter responded with those links :-) And lastly (I just realized I only asked more questions so far... ) is the REST-Server somehow prepared for these extensions? I mean, could I use the 'skeleton' of the Server and only change some parts in order to get all this? With the managed and unmanaged extensions, you add your code into the server through APIs. The managed API gives you a very graph-centric view and manages creation of JSON and HTML representations on your behalf. The unmanaged API gives you a JAX-RS API plus direct access to the underlying database. Jim ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] Neo4j in GIS Applications
Hello there, first I have written a wall of text, previewed it and then the forum went grey and all of the text has gone - AR! In short: I have read some papers about different spatial indices in the last days. The standard R-tree can be improved in various ways or even replaced by a quad-tree. In one of the upcoming PostgreSQL versions they will probably have a quad-tree based SP-GiST implementation. Early proto-typing shows a speedboost of a factor of 6 in several bounding box queries. In Neo4j there are less spatial operations based on an index compared to a relational database and therefore it should be easier to find an appropriate index (which hopefully will speed up some spatial operations). In the course of my master thesis (which starts next week - wish me luck and success) I could have a look into this. So before everything is gone again - DOOOH - I finish this now... Regards, Daniel -- View this message in context: http://neo4j-community-discussions.438527.n3.nabble.com/Neo4j-in-GIS-Applications-tp3393925p3419657.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] Configuring Neo4J via Python bindings
Hey All, I just tested a Python script I've been working on to construct a multi-relational graph in Neo4j. I am using the new Python bindings for embedded Neo4j. After creating about 18K nodes, the database ground to a halt. In the past, when using Gremlin, I would up the heap size for the JVM when encountering problems. I'm not sure how to tweak settings for the JVM now that I'm using the Python bindings to fire up the database. Can I do that from the GraphDatabase() call? Or do I need to look elsewhere to tweak the JVM parameters? If you have any other suggestions about parameters I should change, I'm all ears. Thanks! Chris -- View this message in context: http://neo4j-community-discussions.438527.n3.nabble.com/Configuring-Neo4J-via-Python-bindings-tp3419961p3419961.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] Neo4JClient - .Net - Wiki Documentation updated
Hi,
The Neo4j documentation has been updated at:
http://hg.readify.net/neo4jclient/wiki/Home
HTH
-Original Message-
From: Romiko Derbynew
Sent: Monday, 10 October 2011 10:22 AM
To: 'Bill Baker'
Cc: Tatham Oddie; 'user@lists.neo4j.org'
Subject: RE: [Neo4j] C# REST binding / wrapper
Bill,
Here is an example to create a node without any relationships.
graphClient.Create(new WebSite { Name = acme });
Of course, a better example would be if you had multiple root nodes, perhaps
different hosting sites if it was a multi-tenant portal db.
Cheers
-Original Message-
From: Romiko Derbynew
Sent: Monday, 10 October 2011 10:14 AM
To: 'Bill Baker'
Cc: Tatham Oddie; user@lists.neo4j.org
Subject: RE: [Neo4j] C# REST binding / wrapper
Hi Bill,
Indeed, it makes sense to have the relationships stemming from the root node.
There is a nice tool you can use to start modelling your graph, it is called
GVEdit. You can download it from here:
http://www.graphviz.org/
What we do, is before developing, we first add the poco's to GVEdit, and this
gives us a good idea of how we want to model the database. We always try to
ensure that everything in the DB grows in proportion. So for example, if we add
new nodes, there will be new relationships etc.
For reference data (Perhaps a country names etc) we just have a Countries
Category and then off that each individual country. You can then have a drop
down list in the UI that gets all country nodes from Countries (Grouping Node).
Here is an example of retrieving a list of countries. Each Country is a node
and is Grouped in a Countries Node.
public IEnumerableNodeCountry GetCountries()
{
if (countries != null) return countries;
lock (countriesLock)
{
if (countries != null) return countries;
countries = graphClient
.RootNode
.OutReferenceDataCategory(HasReferenceData.TypeKey)
.OutCountriesCategory(HasCountries.TypeKey)
.OutCountry(HasCountry.TypeKey)
.OrderBy(l = l.Data.Name)
.ToArray();
}
return countries;
}
Notice:
Root Node (g.v(0)) is built into the graphclient, so you automatically have a
reference to g.v.(0)
RootNode-ReferenceDataCategory - CountriesCategory -Country
You can name your relationships any way you like, it is always nice if they are
descriptive enough to give you an idea what direction it would be.
e.g.
HAS_PERMISSION (Implies from User to a Permission node)
Also, you have store payload information on relationships as well, which can be
useful in some scenarios.
I recall, mentioning a way to populate this reference data e.g. a Resource file
with list of countries, so perhaps the first time the db starts up, you can run
a sort of schema check.
See this link below for examples of gvedit and code using the graph client to
create lookup data in the DB:
http://hg.readify.net/neo4jclient/wiki/samples
Cheers
-Original Message-
From: Bill Baker [mailto:bill...@billbak.com]
Sent: Monday, 10 October 2011 4:33 AM
To: Romiko Derbynew
Subject: RE: [Neo4j] C# REST binding / wrapper
That makes a lot of sense. I guess my follow up question is a more generic
Neo4j/graph question; in your schema below, would you have N links from the
root to N CompanyNodes or one line to a 'Companies' node and N links from there
to the N companies? And in either case, does it matter much what we call the
links from the root to the companies (or groups, or people...)? Seems like
that relationship is either an IsA_ link from the root or a BelongsTo
from the node.
Thanks!
BTW, any sample code helps! Thanks.
-Original Message-
From: Romiko Derbynew [mailto:romiko.derby...@readify.net]
Sent: Saturday, October 08, 2011 8:03 PM
To: Bill Baker
Subject: Re: [Neo4j] C# REST binding / wrapper
Hi Bill,
Indeed you will also need to define a relationship with the participating node.
So for example you might have node called Groups which a person belongs to.
Then you might ask but what is Groups related to, well at some point it will be
off the ROOT node.
E.g
RootNode-CompanyNode-Groups-person
So as you see your very first node will be off Root and away you go, the
graphclient always holds a reference to the root node.
So, when making a node, always have the relationship and participating node.
What we have in our system is a schema manager that always checks the DB for
the core nodes e.g Company off root Users off Company Customers off Company
And so on.
Let me know how you go, else I can send you sample code to (initialize) your db
schema.
Cc me at romiko.derby...@readify.net
Sent from my iPhone
On 09/10/2011, at 6:45 AM, Bill Baker bill...@billbak.com wrote:
Romiko,
I'm back to trying Neo4jClient and honestly, am missing something critical I
think. I read the
Re: [Neo4j] Configuring Neo4J via Python bindings
Hi Chris, What do you mean by ground to a halt ? Is it using all available CPU or heavy IO-waits (top, iostat, vmstat)? A thread dump (via jps + jstack ) would be great. You can probably pass in the config map into the Graph database call. Current config is logged to messages.log, please share that too as well as your system parameters (OS, CPU, RAM, Type of disk). Michael Am 13.10.2011 um 23:52 schrieb Chris Diehl: Hey All, I just tested a Python script I've been working on to construct a multi-relational graph in Neo4j. I am using the new Python bindings for embedded Neo4j. After creating about 18K nodes, the database ground to a halt. In the past, when using Gremlin, I would up the heap size for the JVM when encountering problems. I'm not sure how to tweak settings for the JVM now that I'm using the Python bindings to fire up the database. Can I do that from the GraphDatabase() call? Or do I need to look elsewhere to tweak the JVM parameters? If you have any other suggestions about parameters I should change, I'm all ears. Thanks! Chris -- View this message in context: http://neo4j-community-discussions.438527.n3.nabble.com/Configuring-Neo4J-via-Python-bindings-tp3419961p3419961.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
