CODEWITHSUNDEEP
neo4jcypheruser-defined-functionsneo4j-apoc
kazrak
kazrak

Reputation: 3

How do we generate a cypher query by using Java and APOC for Neo4j?

I am trying to create my own procedure in Java in order to use it for Neo4j.I wanted to know how we can execute Cypher code in Java ?

I tried to use graphDB.execute() function but it doesn't work. I just want to execute a basic code in Java by using Neo4j libraries. Example of a basic code I want to execute:

[EDIT]

public class Test
{ 
    @Context public GraphDatabaseService graphDb;
    @UserFunction
    public Result test() {

        Result result = graphDb.execute("MATCH (n:Actor)\n" + 
                "RETURN n.name AS name\n" + 
                "UNION ALL MATCH (n:Movie)\n" + 
                "RETURN n.title AS name", new HashMap<String, Object>());


        return result;
    }
}

Upvotes: 0

Views: 264

Answers (1)

InverseFalcon
InverseFalcon

Reputation: 30407

If you want to display nodes (as in the graphical result view in the browser), then you have to return the nodes themselves (and/or relationships and/or paths), not the properties alone (names and titles). You'll also need this to be a procedure, not a function. Procedures can yield streams of nodes, functions can only return single values.

Change this to a procedure, and change your return type to be something like Stream<NodeResult> where NodeResult is a POJO that has a public Node field.

You'll need to change your return accordingly.

Upvotes: 1

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