使用py2neo将python连接到neo4j时出错

Question

我使用py2neo将以下python代码写入neo4j

 from py2neo import Graph
 from py2neo import neo4j,Node,Relationship
 sgraph = Graph()
 alice = Node("person",name="alice")
 bob   = Node("person",name="bob")
 alice_knows_bob = Relationship(alice,"KNOWS",bob)
 sgraph.create(alice_knows_bob)

但我得到以下错误

Traceback (most recent call last):
File "C:\Python34\lib\site-packages\py2neo\core.py", line 258, in get
response = self.__base.get(headers=headers, redirect_limit=redirect_limit, *
*kwargs)
File "C:\Python34\lib\site-packages\py2neo\packages\httpstream\http.py",line
966, in get
return self.__get_or_head("GET", if_modified_since, headers, redirect_limit,
**kwargs)
File "C:\Python34\lib\site-packages\py2neo\packages\httpstream\http.py",line
943, in __get_or_head
return rq.submit(redirect_limit=redirect_limit, **kwargs)
File "C:\Python34\lib\site-packages\py2neo\packages\httpstream\http.py",line
452, in submit
return Response.wrap(http, uri, self, rs, **response_kwargs)
File "C:\Python34\lib\site-packages\py2neo\packages\httpstream\http.py",line
489, in wrap
raise inst
py2neo.packages.httpstream.http.ClientError: 401 Unauthorized

During handling of the above exception, another exception occurr ed:

Traceback (most recent call last):
File "neo.py", line 7, in <module>
sgraph.create(alice_knows_bob)
File "C:\Python34\lib\site-packages\py2neo\core.py", line 704, in create
statement = CreateStatement(self)
File "C:\Python34\lib\site-packages\py2neo\cypher\create.py", 44,in__init__
self.supports_node_labels = self.graph.supports_node_labels
File "C:\Python34\lib\site-packages\py2neo\core.py", line 1078, in   supports_node_labels return self.neo4j_version >= (2, 0)
File "C:\Python34\lib\site-packages\py2neo\core.py", line 956, in  neo4j_version
return version_tuple(self.resource.metadata["neo4j_version"])
File "C:\Python34\lib\site-packages\py2neo\core.py", line 213, in metadata
self.get()
File "C:\Python34\lib\site-packages\py2neo\core.py", line 261, in get
raise Unauthorized(self.uri.string)
py2neo.error.Unauthorized: http://localhost:7474/db/data/

任何人都可以帮助我.这是我第一次编写python代码连接到neo4j.

Answer 1

如果您使用的是Neo4j 2.2,则默认情况下会启用数据库服务器身份验证.您需要在执行进一步操作之前进行身份验证.阅读文档.

from py2neo import authenticate, Graph

# set up authentication parameters
authenticate("localhost:7474", "user", "pass")

# connect to authenticated graph database
sgraph = Graph("http://localhost:7474/db/data/")

# create alice and bob
...

从相同的文档,

Py2neo提供了一个命令行工具来帮助更改用户密码以及检查是否需要更改密码.

对于新安装,请使用:

$ neoauth neo4j neo4j my-p4ssword
Password change succeeded

设置密码后,该工具还可用于验证凭据

$ neoauth neo4j my-p4ssword
Password change not required