[Neo4j] strange problem while getting a node property
Hi,
I've this strange problem when I try to collect data from the graph with
the Java API in Groovy :
db.allNodes.each {node -
cpt=0
node.getRelationships().each {rel -
cpt++
}
println (${node} ${cpt})
println node.getPropertyKeys()
}
The iteration on each node is right working.
The iteration to count the relationships on each node is working too.
The call node.getPropertyKeys() gives me the list of the properties like
this :
[nbrel, version, maintainer, section, architecture, package, priority,
dataset, installedSize]
But,
If a call node.getProperty(package)
I receive this error :
Caught: org.neo4j.graphdb.NotFoundException: package property not found
for NodeImpl#0
And, If I set the value just before, for test like this :
node.setProperty(package, test)
println node.getProperty(package)
I get the value.
So I can't get property which was not set by the node.setProperty method.
The initial data are copied into the graph with a perl script using the
Neo4j REST interface.
Maybe I do something wrong,
I'm a newbie in both Neo4j and Groovy
Regards,
Jean-Sébastien Stoffen
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Re: [Neo4j] strange problem while getting a node property
When iterating over all nodes, you also pull the reference node (with id = 0),
which probably doesn't have the requested property.
If you want to list all properties of a node, it's better to use a construct
like:
for(String key: node.getPropertyKeys()){
System.out.println(node.getProperty(key));}
Date: Thu, 28 Jul 2011 13:18:50 +0200
From: c-...@jsnet.be
To: user@lists.neo4j.org
Subject: [Neo4j] strange problem while getting a node property
Hi,
I've this strange problem when I try to collect data from the graph with
the Java API in Groovy :
db.allNodes.each {node -
cpt=0
node.getRelationships().each {rel -
cpt++
}
println (${node} ${cpt})
println node.getPropertyKeys()
}
The iteration on each node is right working.
The iteration to count the relationships on each node is working too.
The call node.getPropertyKeys() gives me the list of the properties like
this :
[nbrel, version, maintainer, section, architecture, package, priority,
dataset, installedSize]
But,
If a call node.getProperty(package)
I receive this error :
Caught: org.neo4j.graphdb.NotFoundException: package property not found
for NodeImpl#0
And, If I set the value just before, for test like this :
node.setProperty(package, test)
println node.getProperty(package)
I get the value.
So I can't get property which was not set by the node.setProperty method.
The initial data are copied into the graph with a perl script using the
Neo4j REST interface.
Maybe I do something wrong,
I'm a newbie in both Neo4j and Groovy
Regards,
Jean-Sébastien Stoffen
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Re: [Neo4j] strange problem while getting a node property
Hi Jean-Sébastien,
could you please tell us:
0. Are you sure that Node#0 is the one reporting that it has the
property key package?
1. How is the graph created? Specifically, how are the properties
added? The package property is being reported as existing, so it has
to get there somehow.
2. What version of Neo4j are you using?
3. Are the operations you described part of the same or different
transactions? The same instance of the database?
It would be very helpful if you provided a small piece of code that
reproduces what you see.
cheers,
CG
On Thu, Jul 28, 2011 at 2:18 PM, Jean-Sébastien Stoffen c-...@jsnet.be wrote:
Hi,
I've this strange problem when I try to collect data from the graph with
the Java API in Groovy :
db.allNodes.each {node -
cpt=0
node.getRelationships().each {rel -
cpt++
}
println (${node} ${cpt})
println node.getPropertyKeys()
}
The iteration on each node is right working.
The iteration to count the relationships on each node is working too.
The call node.getPropertyKeys() gives me the list of the properties like
this :
[nbrel, version, maintainer, section, architecture, package, priority,
dataset, installedSize]
But,
If a call node.getProperty(package)
I receive this error :
Caught: org.neo4j.graphdb.NotFoundException: package property not found
for NodeImpl#0
And, If I set the value just before, for test like this :
node.setProperty(package, test)
println node.getProperty(package)
I get the value.
So I can't get property which was not set by the node.setProperty method.
The initial data are copied into the graph with a perl script using the
Neo4j REST interface.
Maybe I do something wrong,
I'm a newbie in both Neo4j and Groovy
Regards,
Jean-Sébastien Stoffen
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User@lists.neo4j.org
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Re: [Neo4j] strange problem while getting a node property
Hi,
thank you very much!
In deed, node 0 doesn't have any properties.
I did not think about this.
Now it's working perfectly.
Regards,
Jean-Sébastien Stoffen
Le 28/07/11 13:26, Niels Hoogeveen a écrit :
When iterating over all nodes, you also pull the reference node (with id =
0), which probably doesn't have the requested property.
If you want to list all properties of a node, it's better to use a construct
like:
for(String key: node.getPropertyKeys()){
System.out.println(node.getProperty(key));}
Date: Thu, 28 Jul 2011 13:18:50 +0200
From: c-...@jsnet.be
To: user@lists.neo4j.org
Subject: [Neo4j] strange problem while getting a node property
Hi,
I've this strange problem when I try to collect data from the graph with
the Java API in Groovy :
db.allNodes.each {node -
cpt=0
node.getRelationships().each {rel -
cpt++
}
println (${node} ${cpt})
println node.getPropertyKeys()
}
The iteration on each node is right working.
The iteration to count the relationships on each node is working too.
The call node.getPropertyKeys() gives me the list of the properties like
this :
[nbrel, version, maintainer, section, architecture, package, priority,
dataset, installedSize]
But,
If a call node.getProperty(package)
I receive this error :
Caught: org.neo4j.graphdb.NotFoundException: package property not found
for NodeImpl#0
And, If I set the value just before, for test like this :
node.setProperty(package, test)
println node.getProperty(package)
I get the value.
So I can't get property which was not set by the node.setProperty method.
The initial data are copied into the graph with a perl script using the
Neo4j REST interface.
Maybe I do something wrong,
I'm a newbie in both Neo4j and Groovy
Regards,
Jean-Sébastien Stoffen
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User@lists.neo4j.org
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