1

我正在尝试使用 python 在 neo4j 中顺序插入顶点和边。添加边时,无法识别现有节点。无论我使用 py2neo 还是灯泡,我都会收到类似的错误消息。

注意我正在使用:linux64 python2.7bulls0.3 py2neo1.5 neo4j-community1.8.2

带灯泡:

>>> from bulbs.neo4jserver import Graph
>>> g = Graph()
>>> g.vertices.create(name="James")
>>> g.vertices.create(name="Julie")
>>> g.edges.create(james, "knows", julie)

---------------------------------------------------------------------------
NameError                                 Traceback (most recent call last)
<ipython-input-46-9ba24256218d> in <module>()
----> 1 g.edges.create(james, "knows", julie)

NameError: name 'james' is not defined

使用 py2neo

from py2neo import neo4j
graph=neo4j.GraphDatabaseService()
node=graph.create({"name":'James'},{'name':'Julie'})
rel=graph.create((james,"knows",julie))
---------------------------------------------------------------------------
NameError                                 Traceback (most recent call last)
<ipython-input-8-591f826cfd05> in <module>()
      2 graph=neo4j.GraphDatabaseService()
      3 node=graph.create({"name":'James'},{'name':'Julie'})
----> 4 rel=graph.create((james,"knows",julie))

NameError: name 'james' is not defined

bulbs此外,如果我使用rexster而不是,我得到了同样的错误neo4j,即

>>> from bulbs.rexster import Graph
>>> g = Graph()
>>> g.vertices.create(name="James")
>>> g.vertices.create(name="Julie")
>>> g.edges.create(james, "knows", julie)
---------------------------------------------------------------------------
NameError                                 Traceback (most recent call last)
<ipython-input-6-2cfb5faa42d1> in <module>()
      3 g.vertices.create(name="James")
      4 g.vertices.create(name="Julie")
----> 5 g.edges.create((james, "knows", julie))

NameError: name 'james' is not defined

这里有什么问题?

谢谢

4

2 回答 2

2

您的应用程序变量不会简单地通过创建具有类似属性的节点来自动james创建。您尚未共享任何 py2neo 代码,而且我对灯泡不熟悉,但在 py2neo 中,您需要执行以下操作:juliename

from py2neo import neo4j
graph_db = neo4j.GraphDatabaseService()
james, julie = graph_db.create(node(name="James"), node(name="Julie"))
graph_db.create(rel(james, "KNOWS", julie))

如果您愿意,您当然可以在同一语句(和批处理)中创建节点和关系:

from py2neo import neo4j
graph_db = neo4j.GraphDatabaseService()
james, julie, friendship = graph_db.create(
    node(name="James"), node(name="Julie"), rel(0, "KNOWS", 1)
)
于 2013-04-27T14:21:56.393 回答
1

您没有在 create 语句上设置jamesor julievars 。

这是正确的代码:

>>> from bulbs.neo4jserver import Graph
>>> g = Graph()
>>> james = g.vertices.create(name="James")
>>> julie = g.vertices.create(name="Julie")
>>> g.edges.create(james, "knows", julie)

有关更多示例,请参阅灯泡快速入门

于 2013-05-16T03:28:12.093 回答