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我正在尝试运行文档中提到的示例 - https://neo4j.com/developer/python/#_resources

class HelloWorldExample:

    def __init__(self, uri, user, password):
        self.driver = GraphDatabase.driver(uri, auth=(user, password))

    def close(self):
        self.driver.close()

    def print_greeting(self, message):
        with self.driver.session() as session:
             greeting = session.write_transaction(self._create_and_return_greeting, message)
             print(greeting)

    @staticmethod
    def _create_and_return_greeting(tx, message):
        result = tx.run("CREATE (a:Greeting) "
                    "SET a.message = $message "
                    "RETURN a.message + ', from node ' + id(a)", message=message)
        return result.single()[0]


if __name__ == "__main__":
    greeter = HelloWorldExample("bolt://localhost:7687", "neo4j", "password")
    greeter.print_greeting("hello, world")
    greeter.close()

错误是 -

Traceback (most recent call last):
  File "createneodb.py", line 26, in <module>
    greeter.print_greeting("hello, world")
  File "createneodb.py", line 13, in print_greeting
    greeting = session.write_transaction(self._create_and_return_greeting, message)
  File "C:\Users\omras\AppData\Local\Programs\Python\Python37\lib\site-packages\neo4j\work\simple.py", line 435, in write_transaction
    return self._run_transaction(WRITE_ACCESS, transaction_function, *args, **kwargs)
  File "C:\Users\omras\AppData\Local\Programs\Python\Python37\lib\site-packages\neo4j\work\simple.py", line 336, in _run_transaction
    self._open_transaction(access_mode=access_mode, database=self._config.database, metadata=metadata, timeout=timeout)
  File "C:\Users\omras\AppData\Local\Programs\Python\Python37\lib\site-packages\neo4j\work\simple.py", line 271, in _open_transaction
    self._connect(access_mode=access_mode, database=database)
  File "C:\Users\omras\AppData\Local\Programs\Python\Python37\lib\site-packages\neo4j\work\simple.py", line 122, in _connect
    bookmarks=self._bookmarks
  File "C:\Users\omras\AppData\Local\Programs\Python\Python37\lib\site-packages\neo4j\io\__init__.py", line 805, in acquire
    return self._acquire(self.address, timeout)
  File "C:\Users\omras\AppData\Local\Programs\Python\Python37\lib\site-packages\neo4j\io\__init__.py", line 660, in _acquire
    connection = self.opener(address, timeout)
  File "C:\Users\omras\AppData\Local\Programs\Python\Python37\lib\site-packages\neo4j\io\__init__.py", line 789, in opener
    **pool_config
  File "C:\Users\omras\AppData\Local\Programs\Python\Python37\lib\site-packages\neo4j\io\__init__.py", line 340, in open
    connection.hello()
  File "C:\Users\omras\AppData\Local\Programs\Python\Python37\lib\site-packages\neo4j\io\_bolt4.py", line 98, in hello
    self.fetch_all()
  File "C:\Users\omras\AppData\Local\Programs\Python\Python37\lib\site-packages\neo4j\io\__init__.py", line 517, in fetch_all
    detail_delta, summary_delta = self.fetch_message()
  File "C:\Users\omras\AppData\Local\Programs\Python\Python37\lib\site-packages\neo4j\io\_bolt4.py", line 271, in fetch_message
    response.on_failure(summary_metadata or {})
  File "C:\Users\omras\AppData\Local\Programs\Python\Python37\lib\site-packages\neo4j\io\_common.py", line 202, in on_failure
    raise AuthError(message)
neo4j.exceptions.AuthError: {code: None} {message: None}

细节：

驱动程序对象以及会话对象已成功初始化。然而，问题是在调用write_transaction时。我无法理解问题的根源。

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2 回答 2

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我最近遇到了这个错误，原因最终是我的用户名/密码有问题。我在引用的配置文件中弄错了它们。这很令人困惑，因为直到我调用该.run()方法的那一行才出现错误，即使我在代码的前面建立了会话。

于 2021-06-29T19:14:27.860 回答
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以下是部分答案 - 最初可以设置您的密码，但您可能无法更改它。

  • 要最初从命令行设置密码，请运行sudo /usr/bin/neo4j-admin set-initial-password YOUR_PASSWORD_HERE.
  • 或者，您可以按照此处所述对 neo4j 服务器运行 curl 请求。
  • 如果您已经设置了密码，则可能需要删除 auth.ini 文件（更多信息请参见此处）。
  • 使用重新启动服务器，sudo neo4j restart以便它接受您的新密码。在 debian 上，如果你不使用 sudo，它就会超时。

就个人而言，我可以设置我的密码，但现在无法更改它。我不确定这是否是一个错误，但命令行和 curl 重置方法都在不更改密码的情况下报告成功，即使在重新启动后也是如此。

于 2021-09-11T22:16:11.030 回答