py2neo中的密码查询 [英] Cypher query in py2neo

问题描述

如何执行 shortestPath() 和 allShortestPaths() 在py2neo中?

How do I perform the functions of shortestPath() and allShortestPaths() in py2neo?

在Cypher中，我将执行以下操作:

In Cypher, I'd execute something like:

START beginning=node(4), end=node(452)
MATCH p = shortestPath(beginning-[*..500]-end)
RETURN p

我已经尝试过我认为是等效的方法(如下)，但这是行不通的(这些关系在cypher中有效，并且node_ *对象确实是正确的节点

I've tried what I thought was the equivalent (below), but this doesn't work (these relationships work in cypher, and the node_* objects are indeed the correct nodes

>>> rels = list(graph_db.match(start_node=node_4, end_node=node_452))
>>> rels
[]

推荐答案

我不想窃取jjaderberg的评论，但是这里是如何使用py2neo运行Cypher查询的方法.据我所知，没有实现图形算法.

I don't want to steal jjaderberg's comment but here is how you could run your Cypher query with py2neo. As far as I know graph algorithms are not implemented.

query_string = "START beginning=node(4), end=node(452) 
                MATCH p = shortestPath(beginning-[*..500]-end) 
                RETURN p"

result = neo4j.CypherQuery(graph_db, query_string).execute()

for r in result:
    print type(r) # r is a py2neo.util.Record object
    print type(r.p) # p is a py2neo.neo4j.Path object

然后，您可以按照以下说明从路径中获得所需的内容: http://book .py2neo.org/en/latest/paths/

You can then get what you need from your path as described here: http://book.py2neo.org/en/latest/paths/

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