Graphson2csv

Dumps huge Graphson's into CSV files which can be fed into Neo4j Batch importer.

• Json Parsing is done via Streaming so it can handle huge Graphsons

Compile

• Make sure you are using Java 7
• mvn package
• mvn assembly:single

Usage

• <path_to_graphson>: Path to graphson.json
• <output_folder> : Folder where nodes.csv and relationships.csv will be generated
• nodeProperty : Stands for the property names of the nodes in the graph i.e: age
• type : Stands for the type of a node property. i.e: string, int..

java -server -Xmx4G -jar target/BatchTools-1.0-SNAPSHOT-jar-with-dependencies.jar
json2csv <path_to_graphson> <output_folder>  nodeProperty1:type,nodeProperty2:type...

Getting a Graphson out of Neo4j Database

• Get Gremlin (Gremlin 2.4.0)
• run bin/gremlin.sh

In the Gremlin shell do:

g = new Neo4jGraph('../path_to_neo4j/graph.db');  
g.saveGraphSON('..output_path/jsongraph.json');

Importing CSV into Neo4j

The files generated by this tool can be fed into:

• Neo4j Stable Version Batch-import Tool
• Neo4j 1.8/1.9 Batch-Import Tool