This project is an example you can use to build user defined procedures, functions and aggregation functions in Neo4j. It contains two procedures, for reading and updating a full-text index.
To try this out, simply clone this repository and have a look at the source and test code (including Test-Server-Setup).
This project requires a Neo4j 4.1.x dependency.
The user defined procedure allows you to get the incoming and outgoing relationships for a given node.
See GetRelationshipTypes.java and the GetRelationshipTypesTests.java.
MATCH (n:Person)
CALL example.getRelationshipTypes(n);The user defined function is a simple join function that joins a list of strings using a delimiter.
See Join.java and the JoinTest.java.
RETURN example.join(['A','quick','brown','fox'],' ') as sentenceThe aggregation function example.last returns the last row of an aggregation.
MATCH (n:Person)
WITH n ORDER BY n.born
RETURN n.born, example.last(n) as lastSee Last.java and the LastTest.java.
This project uses maven, to build a jar-file with the procedure in this project, simply package the project with maven:
mvn clean package
This will produce a jar-file,target/procedure-template-1.0.0-SNAPSHOT.jar,
that can be deployed in the plugin directory of your Neo4j instance.
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