According to
this
the following query:
g.V(ids).as("a").repeat(bothE().otherV().simplePath()).times(5).emit(hasId(within(ids))).as("b").filter(select(last,"a","b").by(id).where("a", lt("b"))).path().by().by(label)
does not work in datastax graph because the lt("b") part cannot work on datastax id which is a json format
{
'~label=person',
member_id=54666,
community_id=505443455
}
How can I change the lt("b) part in order the query to work ?
Please help
You can pick any property that is comparable. E.g., if all your vertices have a name property:
g.V(ids).as("a").repeat(bothE().otherV().simplePath()).times(5).
emit(hasId(within(ids))).as("b").
filter(select(last,"a","b").by("name").where("a", lt("b"))).
path().by().by(label)
Related
I have a large Janusgraph database and I'd to create a subgraph centered around one node type and including incoming and outgoing nodes of specific types.
In Cypher, the query would look like this:
MATCH (a:Journal)N-[:PublishedIn]-(b:Paper{paperTitle:'My Paper Title'})<-[:AuthorOf]-(c:Author)
RETURN a,b,c
This is what I tried in Gremlin:
sg = g.V().outE('PublishedIn').subgraph('j_p_a').has('Paper','paperTitle', 'My Paper Title')
.inE('AuthorOf').subgraph('j_p_a')
.cap('j_p_a').next()
But I get a syntax error. 'AuthorOf' and 'PublishedIn' are not the only edge types ending at 'Paper' nodes.
Can someone show me how to correctly execute this query in Gremlin?
As written in your query, the outE step yields edges and the has step will check properties on those edges, following that the query processor will expect an inV not another inE. Without your data model it is hard to know exactly what you need, however, looking at the Cypher I think this is what you want.
sg = g.V().outE('PublishedIn').
subgraph('j_p_a').
inV().
has('Paper','paperTitle', 'My Paper Title').
inE('AuthorOf').
subgraph('j_p_a')
cap('j_p_a').
next()
Edited to add:
As I do not have your data I used my air-routes graph. I modeled this query on yours and used some select steps to limit the data size processed. This seems to work in my testing. Hopefully you can see the changes I made and try those in your query.
sg = g.V().outE('route').as('a').
inV().
has('code','AUS').as('b').
select('a').
subgraph('sg').
select('b').
inE('contains').
subgraph('sg').
cap('sg').
next()
I have created properties and vertex like
schema.propertyKey('REFERENCE_ID').Int().multiple().create();
schema.propertyKey('Name').Text().single().create();
schema.propertyKey('PARENT_NAME').Text().single().create(); ... ....
.. schema.propertyKey('XXX').Text().single().create();
schema.vertexLabel('VERT1').properties("REFERENCE_ID",.."PROPERTY10"....."PROPERTY15")//15
PROPERTIES
schema.vertexLabel('VER2').properties("REFERENCE_ID",.."PROPERTY20"......"PROPERTY35")//35
PROPERTIES
schema.vertexLabel('VERT3').properties("REFERENCE_ID",.."PROPERTY20"....."PROPERTY25")//25
PROPERTIES
schema.vertexLabel('VERT4').properties("REFERENCE_ID",.."PROPERTY20"....."PROPERTY25")//25
PROPERTIES
and loaded csv data using DSG GRAPHLOADER(CSV TO(VERTEX)).
and created edge
schema.edgeLabel('ed1').single().create()
schema.edgeLabel('ed1').connection('VERT1', 'VER2').add()
schema.edgeLabel('ed1').single().create()
schema.edgeLabel('ed1').connection('VERT1', 'VERT3').add()
schema.edgeLabel('ed2').single().create()
schema.edgeLabel('ed2').connection('VERT3','VERT4').add()
But I don't know how to map the data between vertex and edge. I want to join all these 4 vertex. Could you please help on this?
I'm new to dse. I just ran the above code in datastax studio successfully and I can see the loaded data. I need to join the vertex...
Sql code: I want same in dse germlin.
select v1.REFERENCE_ID,v2.name,v3.total from VERT1 v1
join VER2 v2 on v1.REFERENCE_ID=v2.REFERENCE_ID
join VERT3 v3 on v2.sid=v3.sid
there are 2 "main" options in DSE for adding edge data, plus one if you're also using DSE Analytics.
One is to use Gremlin, like what's documented here - https://docs.datastax.com/en/dse/6.0/dse-dev/datastax_enterprise/graph/using/insertTraversalAPI.html
This approach would be a traversal based approach and may not be the best/fastest choice for bulk operations
Another solution is to use the Graph Loader, check out the example with the .asEdge code sample here - https://docs.datastax.com/en/dse/6.0/dse-dev/datastax_enterprise/graph/dgl/dglCSV.html#dglCSV
If you have DSE Analytics enabled, you can also use DataStax's DSE GraphFrame implementation, which leverages Spark, to preform this task as well. Here's an example - https://docs.datastax.com/en/dse/6.0/dse-dev/datastax_enterprise/graph/graphAnalytics/dseGraphFrameImport.html
Im using the last version of datastax dse graph. I need to load geo point from text file into the graph.
Is it ok to write POINT(12.3 34.5) for geo point in the text data file?
or POINT(X,Y)? or Geo.point(x,y)?
There is an example in the documentation that shows how to load geo data - https://docs.datastax.com/en/latest-dse/datastax_enterprise/graph/reference/refDSEGraphDataTypes.html?hl=graph,geo,data
graph.addVertex(label,'author','name','Jamie Oliver','gender','M','point',Geo.point(1,2))
you can convert the longitude and latitude values into a Point using a transform with DSE GraphLoader (https://docs.datastax.com/en/datastax_enterprise/latest/datastax_enterprise/graph/dgl/dglTransform.html)
geoPointInput = geoPointInput.transform { it['location'] = new com.datastax.driver.dse.geometry.Point(Double.parseDouble(it['longitude']),Double.parseDouble(it['latitude'])); it }
This is the error I get.
16.03.2016 12:02:16.413 WARN [xxx.xxx.xx.xxx [1458147736268] GET /en/employees-leaders/employee-s-toolkit2/epd-update/epd-update-archives/caterpillar-news/upcoming-brand-webinarfocusonmarketing.html HTTP/1.1] com.day.cq.wcm.core.impl.LanguageManagerImpl Error while
retrieving language property. javax.jcr.AccessDeniedException: cannot
read item xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx (alpha-numeric)
I am trying to locate the node in JCR using the xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx, which I believe is uuid, using a query in AEM.
Is the xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx actually a uuid?
How do I locate the source i.e node, causing the issue?
I tried running a sql with the above id in the jcr, but it returned no result.
//*[jcr:contains(., '91186155-45ad-474-9ad9-d5156a398629')] order by #jcr:score descending
Any other insights would be much appreciated.
You don't need a query if you know the Node's UUID, just use the Session.getNodeByIdentifier(String id) method.
Your query is not SQL as you stated, it's XPATH. Is that a typo or did you run the query incorrectly?
It certainly looks like a UUID. You can query for the jcr:uuid property or you can continue doing a full text search.
XPATH:
/jcr:root//*[jcr:contains(., '91186155-45ad-474-9ad9-d5156a398629')]
/jcr:root//*[#jcr:uuid='91186155-45ad-474-9ad9-d5156a398629']
JCR-SQL2:
SELECT * FROM [nt:base] AS s WHERE contains(s.*, '91186155-45ad-474-9ad9-d5156a398629')
SELECT * FROM [nt:base] WHERE [jcr:uuid] = '91186155-45ad-474-9ad9-d5156a398629'
What read permissions does your account have? You're going to find a lot of results for a jcr:uuid query will be under /jcr:system/jcr:versionStorage.
Use QueryBuilderDebugger, (localhost:4502/libs/cq/search/content/querydebug.html) and run similar query as below to get the node for a given uuid:
property=jcr:uuid
property.value=e69b256e-a466-3730-866b-de22c82ab8ck
path=/home
type=rep:Group
p.limit=10
I am having problems getting the elastic search indexes to work correctly with Titan Server. I currently have a local Titan/Cassandra setup using Titan Server 0.4.0 with elastic search enabled. I have a test graph 'bg' with the following properties:
Vertices have two properties, "type" and "value".
Edges have a number of other properties with names like "timestamp", "length" and so on.
I am running titan.sh with the rexster-cassandra-es.xml config, and my configuration looks like this:
storage.backend = "cassandra"
storage.hostname = "127.0.0.1"
storage.index.search.backend = "elasticsearch"
storage.index.search.directory = "db/es"
storage.index.search.client-only= "false"
storage.index.search.local-mode = "true"
This configuration is the same in the bg config in Rexter and the groovy script that loads the data.
When I load up Rexster client and type in g = rexster.getGraph("bg"), I can perform an exact search using g.V.has("type","ip_address") and get the correct vertices back. However when I run the query:
g.V.has("type",CONTAINS,"ip_")
I get the error:
Data type of key is not compatible with condition
I think this is something to do with the type "value" not being indexed. What I would like to do is make all vertex and edge attributes indexable so that I can use any of the string matching functions on them as necessary. I have already tried making an indexed key using the command
g.makeKey("type").dataType(String.class).indexed(Vertex.class).indexed("search",Vertex.class).make()
but to be honest I have no idea how this works. Can anyone help point me in the right direction with this? I am completely unfamiliar with elastic search and Titan type definitions.
Thanks,
Adam
the Wiki page Indexing Backend Overview should answer every little detail of your questions.
Cheers,
Daniel