[Neo4J] ⑥ 組み込みサーバーモードでCypherを実行

Scalaで学習している特典(?)として、先人の取り組みを参考に、組み込みサーバーモードでNeo4Jを立ち上げ、内部からCypherを実行してみた。要するに、これだけ:
https://github.com/kmry/neo4j-embedded

Neo4Jのクエリ言語Cypherをコードで追いかけたい人向けに、書捨てコードをさらしておく
(参考 : http://www.creationline.com/lab/7685)。

package ex1
import org.neo4j.graphdb.factory._
import org.neo4j.graphdb.{DynamicRelationshipType, GraphDatabaseService, Node}
import org.neo4j.cypher.ExecutionEngine

object App {
  val db: GraphDatabaseService = new GraphDatabaseFactory().newEmbeddedDatabase("tmp/neo_yours");
  val engine: ExecutionEngine = new ExecutionEngine(db)

  val cyphers= Array(
    """CREATE (movie:Movie { title:"The Matrix",released:1997 })""",
    """CREATE (movie:Movie { title:"The Matrix",revised:2003 })""",
    """
    MATCH (movie:Movie { title:"The Matrix"})
    RETURN movie
    """,
    """
    MATCH (movie:Movie {title:"The Matrix"})
    SET movie.japanese="マトリックス"
    RETURN movie.title, movie.japanese, movie.released
    """,
    """ MATCH (movie:Movie { title:"The Matrix"}) RETURN movie"""
  )

  def op ={
    val ns = Stream.from(1).iterator //counter
    cyphers.foreach{ c =>
      println (s"コマンド${ns.next} :")
      println (engine.execute(c).dumpToString())
    }
  }
  def main(args: Array[String]): Unit = {
    println("db running")
    op
    db.shutdown()
    println("db shutdown")
  }

}

実行結果はこんな感じ。

$ sbt run
[info] Set current project to neo4j-emb-scala-cypher (in build file:/neo4j-embedded/)
[info] Compiling 1 Scala source to /neo4j-embedded/target/scala-2.11/classes...
[warn] there was one deprecation warning; re-run with -deprecation for details
[warn] one warning found
[info] Running ex1.App 
db running
コマンド1 :
+-------------------+
| No data returned. |
+-------------------+
Nodes created: 1
Properties set: 2
Labels added: 1

コマンド2 :
+-------------------+
| No data returned. |
+-------------------+
Nodes created: 1
Properties set: 2
Labels added: 1

コマンド3 :
+-------------------------------------------+
| movie                                     |
+-------------------------------------------+
| Node[0]{title:"The Matrix",released:1997} |
| Node[1]{title:"The Matrix",revised:2003}  |
+-------------------------------------------+
2 rows

コマンド4 :
+------------------------------------------------+
| movie.title  | movie.japanese | movie.released |
+------------------------------------------------+
| "The Matrix" | "マトリックス"       | 1997           |
| "The Matrix" | "マトリックス"       | <null>         |
+------------------------------------------------+
2 rows
Properties set: 2

コマンド5 :
+-------------------------------------------------------------+
| movie                                                       |
+-------------------------------------------------------------+
| Node[0]{japanese:"マトリックス",title:"The Matrix",released:1997} |
| Node[1]{japanese:"マトリックス",title:"The Matrix",revised:2003}  |
+-------------------------------------------------------------+
2 rows

db shutdown
[success] Total time: 13 s, completed 2015/11/17 1:38:28

Enjoy ;)