python 操作neo4j

1. 安装依赖包

pip install neo4j

2. 使用

class Singleton(type):
    _instances = {}
    def __call__(cls, *args, **kwargs):
        if cls not in cls._instances:
            cls._instances[cls] = super(Singleton, cls).__call__(*args, **kwargs)
            #else 指定了每次创建这个示例，都需要执行init函数
        # else:
        #     cls._instances[cls].__init__(*args, **kwargs)
        return cls._instances[cls]


from neo4j import GraphDatabase

class HelloWorldExample(metaclass = Singleton):

    # driver 只运行一次就好，否则会影响性能
    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.execute_write(self._create_and_return_greeting, message)
            print(greeting)
            
    @staticmethod
    def get_relation(tx,ID=None):
        if ID:
            result = tx.run("MATCH(n1:Node{ID: $ID}) -[r: relation]->(c) return c",ID=ID)
        else:
            result = tx.run("MATCH(n1{ID:1})-[r: relation*..100] -(c) return distinct c")
        return [value[0]._properties for value in result.values()]
    
    def print_relation(self, ID=None):
        with self.driver.session() as session:
            greeting = session.execute_write(self.get_relation, ID)
            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://192.168.214.133:30687", "neo4j", "ellischen")
    greeter.print_relation()
    greeter.close()

数据参考
https://editor.csdn.net/md/?articleId=130485418

https://neo4j.com/developer/python/

https://medium.com/neo4j/neo4j-driver-best-practices-dfa70cf5a763