[Neo4j] GSoC 2011 Neo4j Geoprocessing | Weekly Report #11
Hi, This week I spent the most of the time with documentation, code refactoring and performance optimization. Also did some benchmarking with Neo4j Spatial and PostgreSQL/Postgis(GeoServer). Best Regards Andreas ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] neo4j spatial and postgis
Hi, with the pgsql2shp tool you can dump your postgis db in a shapefile and you should be able to import it in Neo4j Spatial in the following way: String shpPath = SHP_DIR + File.separator + layerName; ShapefileImporter importer = new ShapefileImporter(graphDb(), new NullListener(), commitInterval); importer.importFile(shpPath, layerName); Best Regards Andreas Am 12.08.2011 11:10, schrieb chen zhao: Hi, I very interested in neo4j spatial . but I do not know how to import the spatial data. My data are stored in postgis. I read the document http://wiki.neo4j.org/content/Spatial_Data_Storage; and http://wiki.neo4j.org/content/Importing_and_Exporting_Spatial_Data,but I yet do not know to to import data from postgis or import shapfiles. Could you provide some detail information? Please advice. zhao ___ 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] neo4j spatial and postgis
Or if you want a command line import, try the ruby gem 'neo4j-spatial.rb'. Once installed you can type: osm_import file.shp On Aug 13, 2011 10:33 AM, Andreas Wilhelm a...@kabelbw.de wrote: Hi, with the pgsql2shp tool you can dump your postgis db in a shapefile and you should be able to import it in Neo4j Spatial in the following way: String shpPath = SHP_DIR + File.separator + layerName; ShapefileImporter importer = new ShapefileImporter(graphDb(), new NullListener(), commitInterval); importer.importFile(shpPath, layerName); Best Regards Andreas Am 12.08.2011 11:10, schrieb chen zhao: Hi, I very interested in neo4j spatial . but I do not know how to import the spatial data. My data are stored in postgis. I read the document http://wiki.neo4j.org/content/Spatial_Data_Storage; and http://wiki.neo4j.org/content/Importing_and_Exporting_Spatial_Data,but I yet do not know to to import data from postgis or import shapfiles. Could you provide some detail information? Please advice. zhao ___ 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] Heroku Beta: Neo4j - A Rails Example?
Hi Sasha You are right, your application might become more complex if you split it up the application into a backend and a frontend part using the neo4j server/heroku add on. The tight integration in Rails of the active model objects in the view which make things like validation, creating nested model object, http routing, paginatation, or using other rails plugins (etc...) will not work out of the box when you split up your application with your own HTTP API. However, if your view uses a lot of javascript talking to rails controllers (e.g. single page javascript application) then a neo4j server solution would probably be a good choice. Also, it might feel better having the database as a service rather then as an embedded database. I would still use rails in the backend neo4j server unless the application I develop was very small. (I have not tried this yet.) Rails is a great framework for writing REST/HTTP services. ps: Hope you don't mind that I post this on the neo4j.rb mailing list Cheers Andreas On Fri, Aug 12, 2011 at 11:08 PM, Michael Hunger michael.hun...@neotechnology.com wrote: Sasha you can clone the example github repo (that's also mentioned in the docs): https://github.com/tbaum/script-extension-example Remove the .git directory and add it as a new repo to your github account. Feel free to change whatever you'd like (Gemfile, code, whatever). Michael Am 12.08.2011 um 23:00 schrieb Sasha Agafonoff: Hi Michael, That's all very helpful and makes a huge amount of sense. Thanks very much for committing your time to replying - I appreciate you making the effort! I'd be really grateful for any suggestions from the group/list as to getting started on writing a Rails 3 front end to leverage the backend database. Perhaps if anyone else has started using the Heroku Add-on and they are able to do so, they could share a basic template (perhaps on GitHub) so I could get a better sense of how to get the plumbing working... :-) Cheers, Sasha On 12 August 2011 16:31, Michael Hunger michael.hun...@neotechnology.comwrote: The point is: You don't want to run your webapp in your database. A customer facing rails3 app is an webapp with lots of javascript, UI, images, views etc which also has to be scaled to many instances. On the other hand it needs data to work with. The source of the data is a database in this cause a graph database. But it is much better to talk to your database in terms of your domain (e.g. users, blog posts comments) instead of nodes and relationships. So you basically cut of that lower layer that talks directly to the graph database (and which is very performance sensitive) and move it over to the db. Then you can define the typical use-cases you need for your webapp to render a page and have the domain level endpoints in your database server that provide the _domain level_ data for this rendering process in this granularity and size. HTH Michael P.S: And without a frontend (just having the user management system-domain model running on the graph) (in the neo4j-server in our case) doesn't help you because you don't have to show anything to anyone (no UI). Am 12.08.2011 um 22:02 schrieb Sasha Agafonoff: PPS: I move this discussion to the users list as others probably want to chime in. Hi Michael, Thanks for your email! I am keen to use neo4j.rb rather than neography. The process set out in your example for setting up a back-end neo4j server on Heroku seems pretty straightforward, and I think I understand how I can define domain models and deploy them that way. I think with a bit of effort I could work out how to build something as a Rails front end to work with this, but with my limitations as a coder I don't think I'll do a fantastic job of it. Where I'm struggling is in understanding why I'd need to write two separate apps (backend-frontend) and not be able to write a single app built in the same way as the Rails Project Template ( http://neo4j.rubyforge.org/guides/rails3.html) that Andreas has made available on GitHub. Using that template, I could get rolling with a user management system and domain model very quickly. Andreas: not sure if you have any suggestions about bridging this gap? Maybe I'm missing something simple...? Cheers, Sasha On 11 August 2011 18:27, Michael Hunger michael.hun...@neotechnology.com wrote: Sasha, our rails(3) experience is rather limited. We can ask Andreas if he can come up with something, but I can't make any promises. On the frontend web-app side you're free to do whatever rails stuff you want anyway. On the server side we'd like to encourage really tight, persistence centric REST-applicaitions that talk on a domain level to the frontend-webapp that runs on Heroku. So for a backend rails-REST-app it would perhaps best to look for a good rails3-REST-App example and create something similar, just that it uses neo4j.rb instead of the built-in
Re: [Neo4j] Defining relationships declaritavely or with annotations
Mike, Using Spring Data Graph, when defining a node entity using annotations... @NodeEntity public class User... ... the following code not work compileEclipse complains that the persist() method is not defined for class User, which is true, but in the imdb sample project it's coded the same way for Actor, Movie, etc. What am I missing? ..new User(...).persist(); -Original Message- From: user-boun...@lists.neo4j.org [mailto:user-boun...@lists.neo4j.org] On Behalf Of Michael Hunger Sent: Monday, August 08, 2011 8:59 PM To: Neo4j user discussions Subject: Re: [Neo4j] Defining relationships declaritavely or with annotations What does make you think it not being very mature? As one of the project leads I'm very interested in your thorough evaluation. There are other libraries that follow a similar approach (annotation based mapping), like jo4neo. Neo4j itself is about the core-database, higher level bindings or drivers are provided mostly by the community. Michael Am 09.08.2011 um 02:44 schrieb etc1: Hi Michael, I saw that, but it does not look very mature. Does neo4j offer any other options aside from doing it in the code? XML config, etc, anything but hardcoding programmatically. -Original Message- From: user-boun...@lists.neo4j.org [mailto:user-boun...@lists.neo4j.org] On Behalf Of Michael Hunger Sent: Monday, August 08, 2011 8:41 PM To: Neo4j user discussions Subject: Re: [Neo4j] Defining relationships declaritavely or with annotations You might look into Spring Data Graph for a declarative object graph mapping. See: http://springsource.org/spring-data/neo4j http://bit.ly/sdg-html Cheers Michael Am 09.08.2011 um 02:34 schrieb etc1: Hi, Is it possible to define relationships using declarative configuration or annotations? The Getting Started guide illustrates how to do it programmatically, but I prefer to keep relationship mappings outside of the code, it will be easier to maintain. Thanks ___ 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
