py 读写 neo4j(py2neo)

目录


py2neo

官网:https://py2neo.org/
https://py2neo.org/v4/

其他教程:http://foreversong.cn/archives/1271


安装

(base) $ sudo pip install py2neo

建立连接

from py2neo import * 
graph = Graph("http://127.0.0.1:7474",username="neo4j",password="1234")
 
graph #  Graph('http://neo4j@127.0.0.1:7474')

创建节点

# 利用Node()来创建节点
# Person 表示 label,在图数据库中我们需要 label来表示节点,在后面的图数据库搜索当中 就是依靠这个label来进行搜寻的
node0 = Node('Person' , name = 'Alice')
node1 = Node('Person' , name = 'Bob')
 
node0['age'] = 20
node1['age'] = 25
 
graph.create(node0)
graph.create(node1)

创建关系

node0_know_node1 = Relationship(node0 , 'know' , node1)
graph.create(node0_know_node1)

搜索


属性搜索

matcher = NodeMatcher(graph)
 
node = matcher.match('Person')
node # <py2neo.matching.NodeMatch at 0x7fd9fc5fc690>
 
list(node)
 
'''

    [Node('Person', age=31, name='我'),
     Node('Person', age='31', name='张伟'),
     Node('Person', '好人', age='35', name='好大哥'),
     Node('Person', age=20, name='Alice'),
     Node('Person', age=25, name='Bob')]
'''
 
node = matcher.match('Person').first() # 返回列表的第一个节点
node # Node('Person', age=31, name='我')

 
node = matcher.match('Person', name = 'Alice') # 返回列表中name为Alice的节点
list(node) #[Node('Person', age=20, name='Alice')] 
node # <py2neo.matching.NodeMatch at 0x7fd9fc7050d0>
 
 
node = matcher.match('Person', age = 20) # 返回列表中age为20的节点
list(node) # [Node('Person', age=20, name='Alice')]
 
node = matcher.match('Person').where("_.name = ~'A.*'") # 这里的where语句其实就是正则表达式了,返回列表中name属性以A开头的节点
node  # <py2neo.matching.NodeMatch at 0x7fd9fc705490>

关系搜索

matcher = RelationshipMatcher(graph) 
result = matcher.match({node1},'know')
 
list(result) #  [know(Node('Person', age=20, name='Alice'), Node('Person', age=25, name='Bob'))]

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