python中使用neo4j

参考上片问文档，除了在控制台输入查询外，还可在python中执行查询命令

1.find单个节点。查询tom信息

bash 复制代码

from py2neo import Graph

graph = Graph('bolt://xx.xx.xx.xx:7687',auth=("neo4j","neo4j1234"))
print ("数据库连接正常")

result = graph.run("match (tom {name:'Tom Hanks'}) return tom")

for record in result:
    person_node = record["tom"]
    print(person_node)

2.以节点中的某个属性去查询

修改了下脚本，将url等登录信息放进配置文件中。

bash 复制代码

import configparser
from py2neo import Graph

config = configparser.ConfigParser()
config.read('config.ini')

#获取数据库连接
neo4j_config = config['neo4j']
neo4j_url = neo4j_config['neo4jUrl']
neo4j_name = neo4j_config['neo4jName']
neo4j_passwd = neo4j_config['neo4jPasswd']


graph = Graph(neo4j_url,auth=(neo4j_name,neo4j_passwd))
print ("数据库连接正常")

result = graph.run("match (cloudAtlas {title:'Cloud Atlas'}) return cloudAtlas").data()

for record in result:
    person_node = record["cloudAtlas"]
    print(person_node)

3.查询指定个数的信息

python 复制代码

import configparser
from py2neo import Graph

config = configparser.ConfigParser()
config.read('config.ini')

#获取数据库连接
neo4j_config = config['neo4j']
neo4j_url = neo4j_config['neo4jUrl']
neo4j_name = neo4j_config['neo4jName']
neo4j_passwd = neo4j_config['neo4jPasswd']


graph = Graph(neo4j_url,auth=(neo4j_name,neo4j_passwd))
print ("数据库连接正常")

result = graph.run("match (cloudAtlas:Person) return cloudAtlas limit 10")

for record in result:
    person_node = record["cloudAtlas"]
    print(person_node)

4.条件查询

python 复制代码

import configparser
from py2neo import Graph

config = configparser.ConfigParser()
config.read('config.ini')

#获取数据库连接
neo4j_config = config['neo4j']
neo4j_url = neo4j_config['neo4jUrl']
neo4j_name = neo4j_config['neo4jName']
neo4j_passwd = neo4j_config['neo4jPasswd']


graph = Graph(neo4j_url,auth=(neo4j_name,neo4j_passwd))
print ("数据库连接正常")

result = graph.run("match (nineties:Movie) where nineties.released >= 1990 and nineties.released < 2000 return nineties.title limit 5")

for record in result:
    person_node = record["nineties.title"]
    print(person_node)

5.查询出tom出演的电影名称

python 复制代码

import configparser
from py2neo import Graph

config = configparser.ConfigParser()
config.read('config.ini')

#获取数据库连接
neo4j_config = config['neo4j']
neo4j_url = neo4j_config['neo4jUrl']
neo4j_name = neo4j_config['neo4jName']
neo4j_passwd = neo4j_config['neo4jPasswd']


graph = Graph(neo4j_url,auth=(neo4j_name,neo4j_passwd))
print ("数据库连接正常")
query="match (tom:Person{ name:'Tom Hanks'})-[:ACTED_IN]->(tomHanksMovies) return tom, tomHanksMovies"
result = graph.run(query)

for record in result:
    name = record["tom"]
    movies = record["tomHanksMovies"]
    print(name, movies)

后续的操作，只需要在query中填写需要的查询命令，就能操作各种查询。