2009/8/14 Onur AKTAS <onur.ak...@live.com>:
>
> Thank you for your response. I'm trying to understand the main concept,
> please correct me if I am wrong.
>
> For example, there are many users of an application and each represented as
> "Node". And each User has a "UserId" in RDBMS. I have checked "Node" class
> and saw that there is a method called as " getId() " but I could not see
> "setId()" for mapping the User in the RDBMS to neo4j.
>
> Sample data: (UserId / Friends Ids)
> 1 - [2, 4]
> 2 - [1, 3]
> 3 - [10]
> 4 - [1, 3, 5]
> 5 - [3]
>
> And I need to query " What are the all shortest paths from 1 to 10 for max
> length 4 "
> And results should be,
>
> 1 -> 2 -> 3 -> 10
> 1 -> 4 -> 3 -> 10
> * 1 -> 4 -> 5 -> 3 -> 10 (It will not be shown because it exceeds the length
> 4).
>
> You mean that it can be handled with neo4j, but how can I map each User in
> RDBMS, to Nodes by their original Ids?
You can just come up with your own property key which will represent
that RDBMS id... f.ex:
node.setProperty( "rdbms_id", myRdbmsId );
The node.getId() is just the internal id the node have in neo, which
is unique, but not over time since ids can be reused if they gets
deleted.
>
> Thanks.
>
>
>
>> From: neubauer.pe...@gmail.com
>> Date: Wed, 5 Aug 2009 11:16:15 +0200
>> To: user@lists.neo4j.org
>> Subject: Re: [Neo] neo4j Beginner Question
>>
>> Hi Onur
>>
>> 2009/8/4 Onur AKTAS <onur.ak...@live.com>:
>> > Calculating,"friends of friends", 3rd degree contacts or 4th degree etc.
>> > is not a good idea with RDBMS. In short words, neo4j fits perfectly for
>> > these kinds of jobs?
>> yes, that is the kind of problems Neo4j and Graph Databases are trying
>> to solve in general. Semi-structured data, havy use of relational
>> information between information entities and complex analysis of high
>> depth fast are some of the common use cases for using a graph
>> database.
>>
>> > Do we have a chance to scale neo4j by adding nodes, does it support
>> > distributed processing? Also, can we delete any node in the graph when we
>> > need to delete user or we must create the entire graph again when we need
>> > any updates? Do graph objects have id's that helps us to find the node
>> > quickly?
>>
>> Neo4j atm does not support distributed processing or partitioning the
>> graph. There is high-availability and online-backup being worked on
>> which feels more acute since Neo4j on a single instance scales over 1
>> Billion primitives, which should be enough for most immediate
>> scenarios.
>> But there are of course ways to achieve a custom partitioning using
>> targeted techniques - but that depends on your use case ...
>>
>> HTH
>>
>> /peter
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--
Mattias Persson, [matt...@neotechnology.com]
Neo Technology, www.neotechnology.com
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