使用neo4j Java API查找具有给定标签和属性的所有节点

Question

I know about the findNodesByLabelAndProperty method of the GraphDatabaseServiceObject, but that method requires a value parameter. In my case, I only want to know if there are any (1 or more) nodes in my database that have a specified label and property, but I don't know anything about the value of the property other than it's type. Any ideas?

Thanks Howard

Answer 1

If you are using version 2.0 you could use the method getAllNodesWithLabel from class org.neo4j.tooling.GlobalGraphOperations.

GlobalGraphOperations.getAllNodesWithLabel(DynamicLabel.label("<label_name>"))

For more information: http://neo4j.com/api_docs//2.0.0-M06/org/neo4j/tooling/GlobalGraphOperations.html#getAllNodesWithLabel(org.neo4j.graphdb.Label)

Answer 2

不确定我是否正确理解了这个问题，但是我只是创建另一个（布尔值）属性来查找节点。

Answer 3

You can create another node to store these kinds of counts- a single one with multiple properties such as "nodesWithLabelXAndPropertyY" with the count as the value which you can set at the end of your algorithm run. Or just a boolean exists/not exists value. Then all you need to do is query this node for summary statistics.