使用py2n将python连接到neo4j时出错

Question

我使用py2neo向neo4j编写了以下python代码

 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)

但我犯了以下错误

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/

有人能帮我一下吗？这是我第一次编写连接到neo4j的python代码

Answer 1

如果使用的是Neo4j 2.2，则默认情况下会启用数据库服务器的身份验证。在执行进一步操作之前，需要进行身份验证。阅读documentation。

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
...

---

从同一个documentation

Py2neo provides a command line tool to help with changing user passwords as well as checking whether a password change is required.

对于新安装，请使用：

$ neoauth neo4j neo4j my-p4ssword
Password change succeeded

After a password has been set, the tool can also be used to validate credentials

$ neoauth neo4j my-p4ssword
Password change not required