🚀 go-pugleaf

W dniu 2016-05-22 o 23:35, Borneq pisze:
> Są przykłady oprogramowania bazy neo4j, zwłaszcza w Javie:
> http://neo4j.com/developer/
> Najpierw mamy listę list i
>               String insertQuery = "UNWIND {pairs} as pair " +
>                "MERGE (p1:Person {name:pair[0]}) " +
>                "MERGE (p2:Person {name:pair[1]}) " +
>                "MERGE (p1)-[:KNOWS]-(p2);";
> Co dokładnie robi?
>
>
> import org.neo4j.driver.v1.*;
> import static org.neo4j.driver.v1.Values.parameters;
>
> import java.util.List;
> import static java.util.Arrays.asList;
> import static java.util.Collections.singletonMap;
>
> public class Social {
>
>     public static void main(String...args) {
>
>         Config noSSL =
> Config.build().withEncryptionLevel(Config.EncryptionLevel.NONE).toConfig();
>         Driver driver =
> GraphDatabase.driver("bolt://localhost",AuthTokens.basic("neo4j","test"),noSSL);
> // <password>
>         try (Session session = driver.session()) {
>
>               List data =
>
> asList(asList("Jim","Mike"),asList("Jim","Billy"),asList("Anna","Jim"),
>
> asList("Anna","Mike"),asList("Sally","Anna"),asList("Joe","Sally"),
>               asList("Joe","Bob"),asList("Bob","Sally"));
>
>               String insertQuery = "UNWIND {pairs} as pair " +
>                "MERGE (p1:Person {name:pair[0]}) " +
>                "MERGE (p2:Person {name:pair[1]}) " +
>                "MERGE (p1)-[:KNOWS]-(p2);";
>
>
> session.run(insertQuery,singletonMap("pairs",data)).consume();
>
>                StatementResult result;
>
>                String foafQuery =
>                " MATCH (person:Person)-[:KNOWS]-(friend)-[:KNOWS]-(foaf) "+
>                " WHERE person.name = {name} " +
>                "   AND NOT (person)-[:KNOWS]-(foaf) " +
>                " RETURN foaf.name AS name ";
>                result = session.run(foafQuery, parameters("name","Joe"));
>                while (result.hasNext())
> System.out.println(result.next().get("name"));
>
>                String commonFriendsQuery =
>                "MATCH (user:Person)-[:KNOWS]-(friend)-[:KNOWS]-(foaf:Person)
> " +
>                " WHERE user.name = {from} AND foaf.name = {to} " +
>                " RETURN friend.name AS friend";
>                result = session.run(commonFriendsQuery,
> parameters("from","Joe","to","Sally"));
>                while (result.hasNext())
> System.out.println(result.next().get("friend"));
>
>                String connectingPathsQuery =
>                "MATCH path =
> shortestPath((p1:Person)-[:KNOWS*..6]-(p2:Person)) " +
>                " WHERE p1.name = {from} AND p2.name = {to} " +
>                " RETURN [n IN nodes(path) | n.name] as names";
>                result = session.run(connectingPathsQuery,
> parameters("from","Joe","to","Billy"));
>                while (result.hasNext())
> System.out.println(result.next().get("names"));
>
>         }
>     }
> }
Nie pomyliło Ci się coś?
Nie ta grupa - NTG
A jeśli już coś to nie zajmuj się czymś o ile nie masz o tym pojęcia. Choć 
skromny manual przeczytaj!


-- 
Artur