如何使用Neo4j 2.0.x中的Java API找到具有特定标签的所有节点？

Question

I need to find a specific node in the entire graph using the Java low level API. I used to do this using the Reference node in versions 1.x but that concept has been removed with the 2.0 release.

I thought I could use labels to do this: I would assign a label to this node (and only this node) when it is created. Subsequently I would get all the nodes with this particular label, which should return a single hit, ie the special node I'm looking for. Unfortunately I can't find a way to look up all nodes having a specific label using the Java API.

I am able to do it with Cypher but I'd like this look up to be as fast as possible, so saving the cost of query parsing, planning and execution would be great.

Answer 1

此方法GlobalGraphOperations.getAllNodesWithLabel（Label label）返回具有指定标签的所有节点。

Answer 2

您可以使用GlobalGraphOperations.at(gdb).getAllRelationshipTypes()来获取带有标签的所有节点， gdb就是您的图形数据库。

Answer 3

The provided answer is deprecated . The preferred method is now to use: GraphDatabaseService.findNodes(Label label)

Answer 4

GraphDatabaseService.findNodesByLabelAndProperty (Label label, String propName, String propValue) might suit your bill....

or you could save the id of the node when you create it initially, then you can call GraphDatabaseService.getNodeById(long id) - which would be, by far, the fastest way to retrieve a specific node.