I use Neo4jClient (.NET). I have to import master data like countries.
I've seen that Neo4j has a Java API for that (the batch insertion API). Is it possible to import data via the web interface or another tool?
If not, do I have to import the data via Neo4JClient wrapper with the Create() function?!
Thanks.
It will be much faster if you grit your teeth and do this using the batch insertion API- either by writing an import script in Java or another JVM language or by using Michael Hunger's batch inserter, which inserts data from CSV. Check out Max de Marzi's post on the topic for a good approach.
Even though REST bindings are trying to offer decent performance, they'll never be as fast as native database access- and even if they were, the batch insertion API strips down some of the database features (multi-thread access, etc) to great improve initial import time.
Also,
could you try using Cypher CREATE since that is not as fast as Batch, but faster than REST, and should let you create stuff fast.
http://docs.neo4j.org/chunked/snapshot/cypher-cookbook-pretty-graphs.html gives some good hints ...
Check out the Cypher neo4j import csv option. Maybe that helps. Otherwise just use a big Cypher query
http://neo4j.com/docs/milestone/query-load-csv.html
Related
I have a .rdf file which I was used for Dgraph in order to import the data and the subsequently queries in order to get the relations in the Dgraph Ratel UI.
Now I need to include in my web application for which Dgraph doesn't have support (link). Hence I started looking for Neo4j.
Can anyone please help out how to import .rdf file in Neo4j if not what's the workaround.
Thanks.
Labeled property graph (LPG) and RDF graph are different graph data models, see:
RDF Triple Stores vs. Labeled Property Graphs: What's the Difference? by Jesus Barrasa
Reification is red herring by Bob DuCharme
Neo4j supports LPG data model only. However, there is the neosemantics Neo4j plugin.
After installation, say:
CALL semantics.importRDF(<RDF_file_path>, <RDF_serialization_format>)
The mapping from RDF to LPG is described here.
I'd suggest you to use a proper triplestore for RDF data.
I want to import data into Neo4j. My dataset has about 6 billion rows of data, and I am trying to avoid exporting and importing through CSV. Since this would take a while, is there an alternative way?
If you're fluent in Java, you can also use the parallel batch importer APIs directly from Java, see:
https://github.com/jexp/neo4j-rdbms-import
https://github.com/jexp/neo4j-dataset-import
I am using neo4j-import to import millions of nodes and relationship.
Is there any option to create relationships in to the existing database. I want to import the relationship using neo4j-import because I have millions of relationships.
Your cooperation is truly appreciated! Thanks
neo4j-import can be solely used for initial imports.
For huge mass imports into an existing database in offline mode you can use the batch inserter API.
If the database needs to be online while importing you can use LOAD CSV with periodic commit functionality.
A third option is to write an unmanaged extension to Neo4j and do the import programmatically.
I want to insert RDF data of file containing 10M triple (berlin sparql benchmark) and I want to use neo4j sparql plugin for this. I have following questions regarding this,
sort of similar question was probably asked at Turn Neo4j into a triplestore but I couldn't find answer to my following questions.
Is there any other way to to load data than using http://localhost:7474/db/data/ext/SPARQLPlugin/graphdb/insert_quad ? so I can query it using http://localhost:7474/db/data/ext/SPARQLPlugin/graphdb/execute_sparql. If there is, then how do I do it? and how do I query it after that?
How can I load data which is in ttl form? Do I have to have my data in quad form?
Thanks In Advance!
What do you want to achieve in the first place? Using Neo4j as a plain RDF store won't make you happy.
Try to look at your use-cases, create a sensible property-graph-model for those and import into it.
You can certainly read your ttl file with some tools or libraries available and then drive the Neo4j import from that.
I created an application which embedded Neo4j. In that application I created and stored some nodes with some relationships. My application has saved this database to a file. I would like to visualise that data. I know I can see graphs if I fire up the Neo4j server but I do not know how to import my neo4j.db file into the Neo4j server so that I can visualise it. Any suggestions would be greatly appreciated.
Depending on your use case you might have different solutions:
Use a web-based visualization
Use a desktop application to visualize your data
Use web-based visualization
In this case you have to take care of the web-app to visualize the data.
You have basically two solutions out there: Javascript or Java applets.
For the Javascript side you have many choices: D3js, VivaGraph, SigmaJS, KeyLines.
The first three are open source and free while the last one has a commercial licence and non-free.
There're already a million questions about these libraries on SO, so I'll link you to some of those to understand the various differences.
Desktop Application
The main solutions in this case I would recommend you, depending on the kind of data are: either Gephi or Cytoscape.
In both cases I believe you have to write your own adapter to communicate with your application.
Architecture Reference
The architecture in both cases will be the following:
The controller renders a webpage with the JS visualisation framework you want to use
The controller offers a couple of JSON endpoints the client can use to query the data from the Neo4J embedded
Each query fetch the data, put in a model and render the JSON to send to the client
If you're NOT using neo4j 2.0+ then really good way to visualize your graph is by using neoclipse. https://github.com/neo4j-contrib/neoclipse/downloads
it's really handy and it has cypher support too.
Or
another quick hack is to copy your db folder (which you created by using embedded database) into $NEO4j_HOME/data/
and
change $NEO4j_HOME/conf/neo4j-server-properties file to point to
and
start your server (bin/.neo4j start). You'll be able to visualize your database at localhost:7474
I hope it helps!