I have a Neo4j Graphdatabase with access via the Neo4jClient . (It is a .NET client for the REST api of Neo4j)
There is the beginning of a documentation .
What I have done
The connection to the database works.
Client = new GraphClient(new Uri("http://localhost:7474/db/data"));
Client.Connect();
This way I can insert Nodes...
Client.Create(new myNodeClass { name = "Nobody" });
... and query them.
Node<myNodeClass> Node = Client.Get<WordNode>(138);
return Node.Data.name;
What I want to do
I simply want to add and update relationships between Nodes. (The type of relationship have to be numeric.)
Unfortunately there is no documentation about relationships yet.
There is a command named CreateRelationship
. But I can't get it work.
Client.CreateRelationship(Neo4jClient.NodeReference<TSourceNode>, TRelationship);
Can you give me an example of adding and updating (numeric) relationships?
There's a lot to be found in the test cases... Such as this:
http://hg.readify.net/neo4jclient/src/4693da483a90/Test/ApiUsageIdeas.cs
I was stuck too then I realized I needed to specify the type parameter of the source node reference parameter in the CreateRelationship method.
In this example, I have created the relationship. I have not yet updated the relationship.
Disclosure(It works on my machine as a console application running visual studio 2012, YMMV)
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Http;
using Neo4jClient;
namespace Neo4jClientExample
{
class MyConsoleProgram
{
private GraphClient Client {get;set; }
static void Main(string[] args)
{
try{
GraphClient client = new GraphClient(new Uri("http://localhost:7474/db/data"));
client.Connect();
Us us = new Us { Name = "We are Us" };
NodeReference<Us> usRef = client.Create(us);
Console.WriteLine("us node.id: {0}", usRef.Id);
var queryUs = client.Cypher.Start("n", "node(" + usRef.Id + ")").Return<Node<Us>>("n");
Console.WriteLine("Us node name: {0}\n", queryUs.Results.AsEnumerable<Node<Us>>().First().Data);
AllYourBase allYourBase = new AllYourBase { Name = "We are all your base" };
NodeReference<AllYourBase> allYourBaseRef = client.Create(allYourBase);
Console.WriteLine("AllYourBase node.id: {0}",allYourBaseRef.Id);
var queryAllYourBase = client.Cypher.Start("n", "node(" + allYourBaseRef.Id + ")").Return<Node<AllYourBase>>("n");
Console.WriteLine("AllYourBase node name: {0}\n", queryAllYourBase.Results.AsEnumerable<Node<AllYourBase>>().First().Data);
RelationshipReference areBelongToRef = client.CreateRelationship(allYourBaseRef, new AreBelongTo(usRef));
var query = client.Cypher.Start("allyourbase", "node(" + allYourBaseRef.Id + ")").Match("allyourbase-[:ARE_BELONG_TO]->us").Return<Node<AllYourBase>>("allyourbase");
query.ExecuteWithoutResults();
Console.WriteLine("Result of querying for all your base that belongs to us: {0}", query.Results.AsEnumerable<Node<AllYourBase>>().First().Data.Name);
}
catch(Exception ex)
{
Console.WriteLine("{0}", ex.Message);
Console.WriteLine("{0}", ex.InnerException);
}
Console.ReadKey();
}
}
public class Us
{
public string Name {get; set;}
public Us()
{
}
}
public class AllYourBase
{
public string Name { get; set; }
public AllYourBase()
{
}
}
public class AreBelongTo : Relationship, IRelationshipAllowingSourceNode<AllYourBase>,
IRelationshipAllowingTargetNode<Us>
{
public AreBelongTo(NodeReference targetNode)
: base(targetNode)
{}
public const string TypeKey = "ARE_BELONG_TO";
public override string RelationshipTypeKey
{
get { return TypeKey; }
}
}
您可以查看测试, http://hg.readify.net/neo4jclient/src/4693da483a90/Test/RelationshipTests.cs或联系Neo4j邮件列表上的作者groups.google.com/group/neo4j?
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