Created
June 1, 2017 10:27
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An example proc for a blog post on xclave.co.uk - proper link will pop up soon
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| package movie; | |
| import common.MapResult; | |
| import org.neo4j.procedure.Context; | |
| import org.neo4j.procedure.Name; | |
| import org.neo4j.procedure.Procedure; | |
| import java.util.Collection; | |
| import java.util.HashMap; | |
| import java.util.Map; | |
| import java.util.stream.Collectors; | |
| import java.util.stream.Stream; | |
| import static java.lang.String.format; | |
| import static java.lang.String.join; | |
| public class ActorProcedures { | |
| @Context | |
| public org.neo4j.graphdb.GraphDatabaseService _db; | |
| public static String withParamMapping(String fragment, Collection<String> keys) { | |
| if (keys.isEmpty()) return fragment; | |
| String declaration = " WITH " + join(", ", keys.stream().map(s -> format(" {`%s`} as `%s` ", s, s)).collect(Collectors.toList())); | |
| return declaration + fragment; | |
| } | |
| @Procedure | |
| public Stream<MapResult> getActors(@Name("title") String title) { | |
| Map<String, Object> params = new HashMap<String, Object>(); | |
| params.put("titleParam", title); | |
| return _db.execute(withParamMapping("MATCH (m:Movie)<-[:ACTED_IN]-(a:Person) WHERE m.title = {titleParam} RETURN a", params.keySet()), params).stream().map(MapResult::new); | |
| } | |
| } |
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