我在VS代码中连接到我的Neo4j数据库时遇到了困难。

我从Neo4J文档中给出的模板代码开始：

from neo4j import GraphDatabase
import logging
from neo4j.exceptions import ServiceUnavailable

class Neo4jConnection:

    def __init__(self, uri, user, pwd):
        self.__uri = uri
        self.__user = user
        self.__pwd = pwd
        self.__driver = None
        try:
            self.__driver = GraphDatabase.driver(self.__uri, auth=(self.__user, self.__pwd))
        except Exception as e:
            print("Failed to create the driver:", e)

    def close(self):
        if self.__driver is not None:
            self.__driver.close()

    def query(self, query, db=None):
        assert self.__driver is not None, "Driver not initialized!"
        session = None
        response = None
        try: 
            session = self.__driver.session(database=db) if db is not None else self.__driver.session() 
            response = list(session.run(query))
        except Exception as e:
            print("Query failed:", e)
        finally: 
            if session is not None:
                session.close()
        return response

然后我连接到我的数据库：

conn = Neo4jConnection(uri="neo4j+s://7022d007.databases.neo4j.io", user="neo4j", pwd="****")

然后，我尝试调用neo4j来运行数据库中的任务：

query_string = '''
CALL db.schema.visualization()
'''
conn.query(query_string, db='MARA')

然后失败，并给出错误：无法检索路由信息查询失败：无法检索路由信息