python操作neo4j_from neo4j import graphdatabase

python API操作neo4j

下载neo4j库

pip install neo4j -i https://mirror.baidu.com/pypi/simple
1

连接neo4j

默认用户名和密码是neo4j

from neo4j import GraphDatabase 
url = "neo4j://localhost:7687"
username = "neo4j"
password = "neo4j"

GraphDatabase.driver(url, auth=(username, password))
1
2
3
4
5
6

没报错就是连接成功

python 操作 neo4j 示例

from neo4j import GraphDatabase 

class HelloWorldExample:
    def __init__(self, uri, user, password):
        self.driver = GraphDatabase.driver(uri, auth=(user, password))
    
    def close(self):
        self.driver.close()
    
    def clear_data(self):
        def work(tx):
            tx.run("""
            MATCH (n) DETACH DELETE n
            """)
        with self.driver.session() as session:
            session.write_transaction(work)
    
    def create_node(self):
        def person_work(tx):
            tx.run("""create(p:Person{name: "小明"})""")
            tx.run("""create(p:Person{name: "小美"})""")
        with self.driver.session() as session:
            session.write_transaction(person_work)
    
    def create_relationship(self):
        def work(tx):
            tx.run("""MATCH (a:Person {name:'小明'}), (b:Person {name:'小美'}) MERGE (a)-[:爱]->(b)""")
        with self.driver.session() as session:
            session.write_transaction(work)
    
    def search(self, message):
        with self.driver.session() as session:
            greeting = session.write_transaction(self._work_search, message)
            print(greeting)
    
    @staticmethod
    def _work_search(tx, userName):
        result = tx.run("match(p:Person{name:$userName})-[:爱]-(whom) return whom.name", userName=userName)
        return result.single()[0]

url = "neo4j://localhost:7687"
username = "neo4j"
password = "neo4j"

app = HelloWorldExample(url, username, password)

app.clear_data()
app.create_node()
app.create_relationship()
app.search('小明')
app.close()
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51

如下图，实体和关系已建好，可以进行查询等操作