Re: [Neo4j] Lab day: Cypher queries in embedded python bindings
On 2011-11-18 17:12, Jacob Hansson wrote:
Hey all,
Like we've mentioned before, we have lab-day fridays at Neo4j, and
today I hacked some stuff together that landed directly in trunk
for the embedded python bindings.
As of 1 minute ago, the following operations are now possible with
the embedded python API:
from neo4j import GraphDatabase db =
GraphDatabase(/home/jake/db)
# Plain query result = db.query(START n=node(0) RETURN n)
# Parameterized query result = db.query(START n=node({id}) RETURN
n, id=0)
# Pre-parsed query get_node_by_id = db.prepare_query(START
n=node({id}) RETURN n) result = db.query(get_node_by_id, id=0)
# Read the result for row in result: print row['n']
for value in result['n']: print value
node = db.query(get_node_by_id, id=0)['n'].single
Lemme know what you think :)
This is not available on Pypi yet (will be when the first 1.6
milestone is released) but you can build it super-easily yourself,
instructions are in the readme at github:
https://github.com/neo4j/python-embedded
Hello Jake and you other pythonistas,
I have finally found time to test the Cypher queries in the Python
bindings and I just want to say thank you. Great addition for us!
Br
--
Johan Lundberg
NORDUnet A/S
lundb...@nordu.net
+46730714375
Tulegatan 11
113 53 Stockholm
Sweden
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Re: [Neo4j] Python embedding: problems with shutdown and threads
On 2011-11-03 11:08, Jacob Hansson wrote: On Thu, Nov 3, 2011 at 6:55 AM, Tim McNamara paperl...@timmcnamara.co.nzwrote: Here are a few notes of my own from using Neo4j with Python embedded. I know that this isn't the right place . Ubuntu doesn't set $JAVA_HOME. I ended up hard coding the location of my JVM. I seem to encounter unclean shutdowns all the time when running with the iPython REPL. Is there a db.shutdown() command that I've been neglecting to use? Yeah, as long as you call db.shutdown(), things should be ok. See here: http://docs.neo4j.org/chunked/snapshot/python-embedded-reference-core.html We should perhaps set up the db to shut itself down properly automatically if it detects that python is shutting down.. We decided against that before, since we felt like we don't own the application lifecycle. WDYT? I found this snippet to work great for my modules: def _close_db(): try: neo4jdb.shutdown() except NameError: print 'Could not shutdown Neo4j database. Is it open in \ another process?' import atexit atexit.register(_close_db) Tim On 3 November 2011 17:28, Michael Rene Armida m...@marmida.com wrote: I'm having some weird problems with threading on shutdown. As I previously discovered, using neo4j in a multi-threaded Python app requires complete segregation of neo4j into a single thread. That all works fine for creating a database, however, it appears that shutting one down is a bit of a mystery. I wrote a test program to minimally illustrate the difficulty: http://pastebin.com/gg204kae Threading is always easy to get wrong, so I added a simple switch to remove neo4j from the picture. When I disable neo, the program starts up and shuts down cleanly. When I re-enable neo, some of the print statements never get run, and the app mysteriously exits. I am testing this by saving it into a script and running it on the command line. Any time after the worker thread finishes creating the neo db, I hit ctrl-c, and the two scenarios play out as above. It seems that the embedded Python API is not exactly at the forefront of popular use, and so I understand if nobody knows what's up with this. I just thought I should add something, for the record. I hope my script doesn't have an obvious bug. Thanks, Michael I had a discussion with Tobias this morning about threading with JPype, and am currently writing a fix that will allow full threading support for neo4j-embedded. I'll make sure to run this script as well after that fix is implemented, to make sure it gets fixed as well. As far as the forefront of use goes, there is a surprising amount of pypy downloads of neo4j-embedded (4000 new installs in the last 30 days), so the feedback you are providing here is gonna end up helping a lot of people :) Thank you so much for taking the time to document the issues you are having. /jake ___ 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 -- Johan Lundberg NORDUnet A/S lundb...@nordu.net +46730714375 Tulegatan 11 113 53 Stockholm Sweden ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] Problems binding to a specific ip
Hello, Are there any plans to address the access control problem? I think that even when you can use iptables or similar to achieve the same end result, it would be nice to be able to set a bind address in the neo4j configuration. Also https would be a nice feature :) Br Johan On 2011-06-09 16.14, Chris Gioran wrote: Hi Max, there are two distinct problems here One is that there is no IP access control that can be configured through Neo4j. Setting the listen URIs to a specific address in the configuration does not bind the server there exclusively. This behavior has to be imposed with external means, such as a firewall. The other is a benign bug that has to do with logging the listen address - currently it uses always the java.net.InetAddress methods to find the hostname, ignoring the configuration and leading to the behavior you describe, since the JVM does not prefer the localhost interface. This will be of course addressed in subsequent SNAPSHOTs and milestone releases but it will remain the default behavior. Hope that clarifies things. cheers, CG On Wed, Jun 8, 2011 at 2:59 PM, Maximilian Schulz nam...@gmail.com wrote: Hi everyone, after weeks of experimentation, we finally migrated one of our apps features to neo4j. But now that we are about to deploy the app to our staging server, we discovered a small problem with the server configuration. We have checked the manual at http://docs.neo4j.org/chunked/1.4.M03/server-configuration.html and followed the suggested configuration, but we are not getting the expected results. What we are trying to achieve is to bind the server to localhost, so it is no longer accessible from outside. We restricted access to IPv4 in the wrapper config and set the webadmin data and manage uri to http://localhost:7474. But when starting the server it still binds to the hostname. Here is the output of the start process. Check the last line, where it states that the server is started on http://OUR_DOMAIN:7474/ 6/8/11 1:44:46 PM org.neo4j.server.database.Database INFO: Using database at /tmp/neo4j-community-1.4.M03/data/graph.db 6/8/11 1:44:47 PM org.neo4j.server.modules.DiscoveryModule INFO: Mounted discovery module at [/] 6/8/11 1:44:47 PM org.neo4j.server.modules.RESTApiModule INFO: Mounted REST API at [http://localhost:7474/db/data/] 6/8/11 1:44:47 PM org.neo4j.server.modules.ManagementApiModule INFO: Mounted management API at [http://localhost:7474/db/manage/] 6/8/11 1:44:47 PM org.neo4j.server.modules.WebAdminModule INFO: Mounted webadmin at [/webadmin] 6/8/11 1:44:47 PM org.neo4j.server.NeoServerWithEmbeddedWebServer INFO: Starting Neo Server on port [7474] 6/8/11 1:44:47 PM org.neo4j.server.web.Jetty6WebServer INFO: Mounting static content at [/webadmin] from [webadmin-html] 6/8/11 1:44:48 PM org.neo4j.server.NeoServerWithEmbeddedWebServer INFO: Server started on [http://OUR_DOMAIN:7474/] I am pretty sure that I have missed something, but I cannot figure out what. Any help is greatly appreciated! Max ___ 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 -- Johan Lundberg NORDUnet NUNOC lundb...@nordu.net +46(0)8 207860 Tulegatan 11 113 53 Stockholm Sweden ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
