import org.neo4j.graphdb.*;

import org.neo4j.graphdb.factory.GraphDatabaseFactory;

import java.io.File;

public class Neo4jCypherJavaAPI {

public static void main(String[] args) {

//指定 Neo4j 存储路径

File file = new File("/tmp/data/databases/graph2.db");

//Create a new Object of Graph Database

GraphDatabaseService graphDB = new GraphDatabaseFactory().newEmbeddedDatabase(file);

System.out.println("Server is up and Running");

try(Transaction tx = graphDB.beginTx()){

//通过Cypher查询获得结果

StringBuilder sb = new StringBuilder();

sb.append("MATCH (john)-[:IS_FRIEND_OF]->(USER)-[:HAS_SEEN]->(movie) ");

sb.append("RETURN movie");

Result result = graphDB.execute(sb.toString());

//遍历结果

while(result.hasNext()){

//get("movie")和查询语句的return movie相匹配

Node movie = (Node) result.next().get("movie");

System.out.println(movie.getId() + " : " + movie.getProperty("name"));

}

tx.success();

System.out.println("Done successfully");

} catch (Exception e) {

e.printStackTrace();

} finally {

graphDB.shutdown(); //关闭数据库

}

}

}