Question

我在Java项目中创建了一个嵌入式Neo4J，如下所示：

graphDb = new GraphDatabaseFactory()
            .newEmbeddedDatabaseBuilder("db")
            .setConfig(GraphDatabaseSettings.node_keys_indexable, "movieId, userId, rating, genre")
            .setConfig(GraphDatabaseSettings.node_auto_indexing, "true")
            .newGraphDatabase();

我已经验证索引已创建，并且它具有我期望的名称：

Index<Node> index = graphDb.index().forNodes("movieId");
System.out.println("::: Verify Index Name :::");
System.out.println(index.getName());

控制台显示：

::: Verify Index Name :::
movieId

我可以使用Java API找到节点

ReadableIndex<Node> graphDbIndex = graphDb.index().getNodeAutoIndexer().getAutoIndex();
Node movie = graphDbIndex.get("movieId", 2).getSingle();
System.out.println("::: Get with Java API Result :::");
System.out.println("MovieId: " + movie.getProperty("movieId"));
System.out.println("Title: " + movie.getProperty("title"))

控制台显示

::: Get with Java API Result :::
MovieId: 2
Title: Jumanji (1995)

但是当我尝试使用Cypher时，这就是结果

ExecutionEngine engine = new ExecutionEngine(graphDb);
ExecutionResult result = engine.execute("start movie=node:movieId(movieId='2') return movie, movie.title");
System.out.println("::: get with Cypher Result :::");
System.out.println(result);

控制台显示

::: get with Cypher Result :::
+---------------------+
| movie | movie.title |
+---------------------+
+---------------------+
0 row
8 ms

我做错了什么或者我错过了一些明显的东西？

感谢。

Answer 1

id是字符串吗？尝试使用lucene索引语法：

start movie=node:node_auto_index('movieId:2') 
return movie, movie.title

Cypher Query未找到Node

1 个答案: