Re: [Neo] python binding data import problem
I would suggest using the indexing capabilities to solve this:
name_index = neo.index("name", create=True)
def get_node(id):
node = name_index[id]
if node is None:
node = neo.node(name=id)
name_index[id] = node
return node
Cheers,
Tobias
On Sat, Nov 14, 2009 at 6:51 PM, Yin Chen wrote:
> Hi:
>I was playing with the Neo4j and its python binding. I want to import
> the user relationship data to Neo4j.
>Say id is the unique id for the user, I found no easy way to prevent the
> same id from generating different Nodes.
>The code below may works, but the data may be too big for memory.
>
>id_node_mapping = {}
>def get_node(id):
>if id in id_node_mapping:
>return id_node_mapping.get(id)
>else:
>node = neo.node(name=id)
>id_node_mapping[id] = node
>return node
>
>Any solution to this problem? Thanks.
> ___
> Neo mailing list
> User@lists.neo4j.org
> https://lists.neo4j.org/mailman/listinfo/user
>
--
Tobias Ivarsson
Hacker, Neo Technology
www.neotechnology.com
Cellphone: +46 706 534857
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[Neo] python binding data import problem
Hi:
I was playing with the Neo4j and its python binding. I want to import
the user relationship data to Neo4j.
Say id is the unique id for the user, I found no easy way to prevent the
same id from generating different Nodes.
The code below may works, but the data may be too big for memory.
id_node_mapping = {}
def get_node(id):
if id in id_node_mapping:
return id_node_mapping.get(id)
else:
node = neo.node(name=id)
id_node_mapping[id] = node
return node
Any solution to this problem? Thanks.
___
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User@lists.neo4j.org
https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo] trouble installing jpype, alternate installation sought
According to Steve Ménard (The developer of JPype) this is typically what happens when you are trying to use a JRE instead of a JDK as the source for the Java/JNI header files when compiling.[1] I hope this is enough for you to work out these problems. Cheers, Tobias [1] http://sourceforge.net/mailarchive/forum.php?thread_name=1afed6d30907300541v74a722c0nbf9155832affd101%40mail.gmail.com&forum_name=jpype-users On Sat, Nov 14, 2009 at 6:11 PM, Gregg Lind wrote: > I'm working on installing neo4j.py, using the instructions at > http://components.neo4j.org/neo4j.py/. > > Jpype doesn't seem to build for me. (Centos5.4, x64, Python2.4.3). Is > this > usual (if you know) and if not, is there any way around this? > > [final message from python setup.py build > > src/native/common/jp_javaenv_autogen.cpp:1754: error: ‘class _Jv_JNIEnv’ > has > no member named ‘functions’ > error: command 'gcc' failed with exit status 1 > ] > > Cheers, > > Gregg Lind > ___ > Neo mailing list > User@lists.neo4j.org > https://lists.neo4j.org/mailman/listinfo/user > -- Tobias Ivarsson Hacker, Neo Technology www.neotechnology.com Cellphone: +46 706 534857 ___ Neo mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
[Neo] trouble installing jpype, alternate installation sought
I'm working on installing neo4j.py, using the instructions at http://components.neo4j.org/neo4j.py/. Jpype doesn't seem to build for me. (Centos5.4, x64, Python2.4.3). Is this usual (if you know) and if not, is there any way around this? [final message from python setup.py build src/native/common/jp_javaenv_autogen.cpp:1754: error: ‘class _Jv_JNIEnv’ has no member named ‘functions’ error: command 'gcc' failed with exit status 1 ] Cheers, Gregg Lind ___ Neo mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo] [neo4j.py] A Few Questions
Hi, Welcome to the mailing list. On Thu, Nov 12, 2009 at 9:28 PM, Andrew Nelder wrote: > Hi, > > I would like to try playing around with and expanding upon the neo4j.py > wrapper; however, I've run into a few issues. > > (1) I can't seem to find a way to return helpful information about a node > (ie. it's depth). Does anyone have a working example or even an > explanation > of how to obtain the depth (and perhaps other node information) during a > traversal? I've been playing with the examples and documention on the > neo4j.py website, but it's not been extremely helpful. > The depth is available under the depth attribute in the nodes yielded from traversals. Just as it is in the traversal predicate methods[1]. The depth attribute is the only traversal attribute that is available on yielded nodes, inside the predicate methods the attributes last_relationship, is_start, previous_node, and returned_count are also available. > (2) Is there a better way to initialize the traversal? It uses lazy > imports, so Python seems to crap out when the code is run because neo4j > doesn't have properties like (Traversal) until NeoService is called. > Yes, this is a problem. I have not gotten around to fixing it yet, but it is on my TODO list for the next release. My plan is to have these available before NeoService is started, but until then the way you've done it is a pretty good work around. Over all I am not very satisfied with how traversals are defined for the python bindings. The current API is good enough to not be removed in the next version. But if anyone has any better suggestions on how to write traversals I would very much like to hear about it. Cheers, Tobias [1] See the Traversals section of http://components.neo4j.org/neo4j.py/index.html -- Tobias Ivarsson Hacker, Neo Technology www.neotechnology.com Cellphone: +46 706 534857 ___ Neo mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
