[英]Is it possible to iterate through all nodes with py2neo
Is there a way to iterate through every node in a neo4j database using py2neo? 有没有办法使用py2neo迭代neo4j数据库中的每个节点?
My first thought was iterating through GraphDatabaseService
, but that didn't work. 我的第一个想法是迭代
GraphDatabaseService
,但这不起作用。 If there isn't a way to do it with py2neo, is there another python interface that would let me? 如果没有办法用py2neo做,那么还有另一个python接口可以让我吗?
Edit: I'm accepting @Nicholas's answer for now, but I'll update it if someone can give me a way that returns a generator. 编辑:我现在正在接受@Nicholas的答案,但如果有人能给我一个返回发电机的方法,我会更新它。
I would suggest doing that with asynchronous Cypher, something like: 我建议使用异步Cypher,例如:
from py2neo import neo4j, cypher
graph_db = neo4j.GraphDatabaseService()
def handle_row(row):
node = row[0]
# do something with `node` here
cypher.execute(graph_db, "START z=node(*) RETURN z", row_handler=handle_row)
Of course you might want to exclude the reference node or otherwise tweak the query. 当然,您可能希望排除引用节点或以其他方式调整查询。
Nige 的NiGe
One of two solutions come to mind. 我想到了两种解决方案之一。 Either do a cypher query
要么做一个密码查询
START n=node(*) return n
The other, and I'm not familiar with python so I'm going to give the example in Java is 另一个,我不熟悉python所以我打算用Java来举例说明
GlobalGraphOperations.at(graphDatabaseService).getAllNodes()
which is the way the the old deprecated graphDatabaseService.getAllNodes()
recommends. 这是旧的不推荐使用的
graphDatabaseService.getAllNodes()
推荐的方式。
For newer versions of py2neo the accepted version no longer works. 对于较新版本的py2neo,接受的版本不再有效。 Instead use:
而是使用:
from py2neo import Graph
graph = Graph("http://user:pass@localhost:7474/db/data/")
for n in graph.cypher.stream("START z=node(*) RETURN z"):
//do something with node here
print n
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