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neo4j+Python + py2neo 对接 Neo4j:节点、关系、属性增删改查入门

  • 2026-07-02 16:46:29
neo4j+Python + py2neo 对接 Neo4j:节点、关系、属性增删改查入门

Python + py2neo 对接 Neo4j:节点、关系、属性增删改查入门

如果你刚开始学习知识图谱、图数据库,Neo4j 基本绕不开。

Neo4j 里面最核心的东西其实就两个:

  • 节点:比如一个学生、一门课程、一家公司。
  • 关系:比如学生选了课程、员工属于公司、电影由某个导演执导。

这篇文章用 Python 连接 Neo4j,带你从安装、连接,到节点、关系、属性的增删改查全部跑一遍。

本文适合初学者,所以不搞复杂配置,不写 .env,不封装类,直接一个 demo.py 文件开跑。


1. 准备环境和安装依赖

先确认 Neo4j 已经启动。

一般本地访问地址是:

http://127.0.0.1:7474/browser/

本文使用的连接信息如下:

账号:neo4j密码:neo4j123456Bolt 地址:bolt://127.0.0.1:7687

Python 这边安装 py2neo

pip install py2neo

安装完成后,就可以开始写代码了。


2. 第一次连接 Neo4j

新建一个文件,叫 demo.py

先写最简单的连接测试:

from py2neo import Graphgraph = Graph("bolt://127.0.0.1:7687", auth=("neo4j""neo4j123456"))result = graph.run("RETURN 'Neo4j 连接成功' AS message").data()print(result)

运行:

python demo.py

如果看到类似下面的结果,说明 Python 已经连上 Neo4j 了:

[{'message': 'Neo4j 连接成功'}]

3. 清理旧测试数据

为了教程可以反复运行,我们先清理一下本教程创建的示例数据。

注意:这里只删除带有 Student 和 Course 标签的数据。

from py2neo import Graphgraph = Graph("bolt://127.0.0.1:7687", auth=("neo4j""neo4j123456"))graph.run("MATCH (n:Student) DETACH DELETE n")graph.run("MATCH (n:Course) DETACH DELETE n")print("测试数据清理完成")

这里用到了 DETACH DELETE,它的意思是:删除节点时,顺便删除这个节点上的关系。


4. 创建节点

节点可以理解为一条数据。

比如创建一个学生节点:

from py2neo import Graph, Nodegraph = Graph("bolt://127.0.0.1:7687", auth=("neo4j""neo4j123456"))student = Node("Student", name="张三", age=18)graph.create(student)print("学生节点创建成功")

这里的 Student 是节点标签,name 和 age 是节点属性。

再创建一门课程:

from py2neo import Graph, Nodegraph = Graph("bolt://127.0.0.1:7687", auth=("neo4j""neo4j123456"))course = Node("Course", name="Python 入门", score=5)graph.create(course)print("课程节点创建成功")

运行到这里,Neo4j 里已经能看到 2 个学生节点和 2 个课程节点:


5. 查询节点

查询一个学生:

from py2neo import Graphgraph = Graph("bolt://127.0.0.1:7687", auth=("neo4j""neo4j123456"))student = graph.nodes.match("Student", name="张三").first()print(student)

如果想拿到节点属性:

print(student["name"])print(student["age"])

查询所有学生:

from py2neo import Graphgraph = Graph("bolt://127.0.0.1:7687", auth=("neo4j""neo4j123456"))students = graph.nodes.match("Student")for student in students:print(student["name"], student["age"])

6. 修改节点属性

先查到节点,再修改属性,最后用 graph.push() 推送到 Neo4j。

from py2neo import Graphgraph = Graph("bolt://127.0.0.1:7687", auth=("neo4j""neo4j123456"))student = graph.nodes.match("Student", name="张三").first()student["age"] = 19student["city"] = "北京"graph.push(student)print("学生属性修改成功")

查看一下:

student = graph.nodes.match("Student", name="张三").first()print(dict(student))

输出大概是:

{'name': '张三', 'age': 19, 'city': '北京'}

7. 删除节点属性

删除属性也很简单,像操作 Python 字典一样:

from py2neo import Graphgraph = Graph("bolt://127.0.0.1:7687", auth=("neo4j""neo4j123456"))student = graph.nodes.match("Student", name="张三").first()del student["city"]graph.push(student)print("city 属性删除成功")

8. 删除节点

删除节点使用 graph.delete()

from py2neo import Graphgraph = Graph("bolt://127.0.0.1:7687", auth=("neo4j""neo4j123456"))student = graph.nodes.match("Student", name="张三").first()graph.delete(student)print("学生节点删除成功")

注意:如果这个节点上还有关系,直接删除可能失败。

初学阶段更推荐用 Cypher:

graph.run("MATCH (s:Student {name: '张三'}) DETACH DELETE s")

DETACH DELETE 会先删除关系,再删除节点。


9. 创建关系

关系用来描述两个节点之间的联系。

比如:张三选了 Python 入门课程。

from py2neo import Graph, Node, Relationshipgraph = Graph("bolt://127.0.0.1:7687", auth=("neo4j""neo4j123456"))student = Node("Student", name="张三", age=18)course = Node("Course", name="Python 入门", score=5)graph.create(student)graph.create(course)rel = Relationship(student, "SELECTED", course, created_at="2026-05-21")graph.create(rel)print("关系创建成功")

运行后,Neo4j 图谱里会出现学生到课程的 SELECTED 关系:

这段代码创建了:

(张三)-[:SELECTED]->(Python 入门)

关系 SELECTED 上还有一个属性:created_at


10. 查询关系

查询关系用 Cypher 最直观:

from py2neo import Graphgraph = Graph("bolt://127.0.0.1:7687", auth=("neo4j""neo4j123456"))rows = graph.run("""MATCH (s:Student)-[r:SELECTED]->(c:Course)RETURN s.name AS student, c.name AS course, r.created_at AS created_at""").data()for row in rows:print(row)

输出类似:

{'student': '张三', 'course': 'Python 入门', 'created_at': '2026-05-21'}

11. 修改关系属性

关系也可以有属性,比如选课时间、分数、状态。

修改关系属性:

from py2neo import Graphgraph = Graph("bolt://127.0.0.1:7687", auth=("neo4j""neo4j123456"))graph.run("""MATCH (:Student {name: '张三'})-[r:SELECTED]->(:Course {name: 'Python 入门'})SET r.score = 95RETURN r""")print("关系属性修改成功")

查询一下:

rows = graph.run("""MATCH (:Student {name: '张三'})-[r:SELECTED]->(:Course {name: 'Python 入门'})RETURN r.created_at AS created_at, r.score AS score""").data()print(rows)

属性更新以后,图谱结构不会变,但节点和关系上的属性已经变化。Neo4j 的图谱状态如下:


12. 删除关系

只删除关系,不删除节点:

from py2neo import Graphgraph = Graph("bolt://127.0.0.1:7687", auth=("neo4j""neo4j123456"))graph.run("""MATCH (:Student {name: '张三'})-[r:SELECTED]->(:Course {name: 'Python 入门'})DELETE r""")print("关系删除成功")

删除关系后,学生和课程节点还在,只是它们之间没有这条 SELECTED 关系了。下面这张图可以看到,节点还在,但关系数量变少了:


13. 用 Cypher 做节点增删改查

py2neo 可以用对象方式操作,也可以直接执行 Cypher。

初学者建议两种都了解,但真正写复杂查询时,Cypher 更清楚。

创建节点

graph.run("""CREATE (s:Student {name: '李四', age: 20})RETURN s""")

查询节点

rows = graph.run("""MATCH (s:Student)RETURN s.name AS name, s.age AS age""").data()print(rows)

修改节点

graph.run("""MATCH (s:Student {name: '李四'})SET s.age = 21RETURN s""")

删除节点

graph.run("""MATCH (s:Student {name: '李四'})DETACH DELETE s""")

14. 一个完整小案例

下面这段代码可以直接复制到 demo.py 运行。

它会完成这些事情:

  1. 清理旧数据。
  2. 创建 2 个学生。
  3. 创建 2 门课程。
  4. 创建选课关系。
  5. 查询学生选了哪些课。
  6. 修改节点和关系属性。
  7. 删除一条关系。
from py2neo import Graph, Node, Relationshipgraph = Graph("bolt://127.0.0.1:7687", auth=("neo4j""neo4j123456"))# 1. 清理旧数据graph.run("MATCH (n:Student) DETACH DELETE n")graph.run("MATCH (n:Course) DETACH DELETE n")# 2. 创建学生节点zhangsan = Node("Student", name="张三", age=18)lisi = Node("Student", name="李四", age=20)graph.create(zhangsan)graph.create(lisi)# 3. 创建课程节点python_course = Node("Course", name="Python 入门", score=5)neo4j_course = Node("Course", name="Neo4j 入门", score=4)graph.create(python_course)graph.create(neo4j_course)# 4. 创建关系rel1 = Relationship(zhangsan, "SELECTED", python_course, created_at="2026-05-21")rel2 = Relationship(zhangsan, "SELECTED", neo4j_course, created_at="2026-05-21")rel3 = Relationship(lisi, "SELECTED", neo4j_course, created_at="2026-05-21")graph.create(rel1)graph.create(rel2)graph.create(rel3)# 5. 查询关系rows = graph.run("""MATCH (s:Student)-[r:SELECTED]->(c:Course)RETURN s.name AS student, c.name AS course, r.created_at AS created_atORDER BY student, course""").data()print("选课结果:")for row in rows:print(row)# 6. 修改节点属性zhangsan["age"] = 19graph.push(zhangsan)# 7. 修改关系属性graph.run("""MATCH (:Student {name: '张三'})-[r:SELECTED]->(:Course {name: 'Python 入门'})SET r.score = 95""")# 8. 删除一条关系graph.run("""MATCH (:Student {name: '张三'})-[r:SELECTED]->(:Course {name: 'Neo4j 入门'})DELETE r""")# 9. 最终查询final_rows = graph.run("""MATCH (s:Student)-[r:SELECTED]->(c:Course)RETURN s.name AS student, s.age AS age, c.name AS course, r.score AS scoreORDER BY student, course""").data()print("最终结果:")for row in final_rows:print(row)

运行后,打开 Neo4j Browser,输入:

MATCH p=(s:Student)-[r:SELECTED]->(c:Course)RETURN p

就能看到学生和课程之间的关系图。

下面是导出的 Neo4j 图谱效果:


15. 常见报错

1. 密码错误

如果看到类似认证失败的信息,先检查这里:

Graph("bolt://127.0.0.1:7687", auth=("neo4j""neo4j123456"))

账号、密码要和你 Neo4j 里设置的一致。

2. Neo4j 没启动

如果提示连接不上,先打开浏览器访问:

http://127.0.0.1:7474/browser/

如果页面打不开,说明 Neo4j 服务还没启动。

3. 端口写错

Neo4j 常见有两个端口:

7474:浏览器页面端口7687:Python 连接用的 Bolt 端口

Python 代码里要写:

Graph("bolt://127.0.0.1:7687", auth=("neo4j""neo4j123456"))

不要写成 7474

4. 删除节点失败

如果节点上还有关系,直接删除可能失败。

推荐初学者用:

MATCH (n:Student {name: '张三'})DETACH DELETE n

DETACH DELETE 会把节点和它相关的关系一起删除。

5. 重复创建了很多节点

如果你反复运行 graph.create(),它每次都会创建新节点。

如果想避免重复,可以先清理:

graph.run("MATCH (n:Student) DETACH DELETE n")graph.run("MATCH (n:Course) DETACH DELETE n")

等熟悉以后,再学习唯一约束和 MERGE


16. 小结

这篇文章我们用 py2neo 完成了 Neo4j 的基础操作:

  • 连接 Neo4j
  • 创建节点
  • 查询节点
  • 修改节点属性
  • 删除节点和属性
  • 创建关系
  • 查询关系
  • 修改关系属性
  • 删除关系
  • 用 Cypher 完成增删改查

如果你是初学者,不需要一上来就学很复杂的封装。

先把这几个动作跑通:

节点怎么建节点怎么查属性怎么改关系怎么连关系怎么删Cypher 怎么执行

这些搞明白以后,再去做知识图谱、推荐关系、人物关系、业务链路分析,就会顺很多。

建议你现在就复制完整案例,运行一次,然后去 Neo4j Browser 里看图谱效果。

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  1. CONNECT:[ UseTime:0.000482s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000552s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.001844s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.001065s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000666s ]
  6. SELECT * FROM `set` [ RunTime:0.008101s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000688s ]
  8. SELECT * FROM `article` WHERE `id` = 494981 LIMIT 1 [ RunTime:0.007303s ]
  9. UPDATE `article` SET `lasttime` = 1783056562 WHERE `id` = 494981 [ RunTime:0.020975s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.004272s ]
  11. SELECT * FROM `article` WHERE `id` < 494981 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.002427s ]
  12. SELECT * FROM `article` WHERE `id` > 494981 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.012802s ]
  13. SELECT * FROM `article` WHERE `id` < 494981 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.022136s ]
  14. SELECT * FROM `article` WHERE `id` < 494981 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.033278s ]
  15. SELECT * FROM `article` WHERE `id` < 494981 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.010567s ]
0.197103s