neo4j入门（三）在数据库已知存在的节点上创建新的边

程序员乔戈里

于 2019-05-16 22:09:03 发布

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CC 4.0 BY-SA版权

分类专栏： neo4j

本文链接：https://blog.youkuaiyun.com/WantFlyDaCheng/article/details/90273347

from py2neo import Graph, Node, Relationship
from py2neo import  NodeSelector

graph = Graph("http://localhost:7474", username="neo4j", password='root')
graph.delete_all() # 清空数据库

'''
1 —— 创建node，函数第一个参数是节点类型，第二个参数是value值
'''
a = Node('PersonTest', name='张三')
b = Node('PersonTest', name='李四')
r = Relationship(a, 'KNOWNS', b)
s = a | b | r
graph.create(s)
def findHasNode(label,name):
    data2 = graph.find_one(label=label, property_key='name', property_value=name)
    if(data2 == None):
        return 0
    else:
        return data2
def createRelationship(t1,t1_name,t2,t2_name):
    # t1 = 'PersonTest' #哪种类型的节点
    # t1_name = '张三'
    # t2 = 'PersonTest'
    # t2_name = "王五"
    tempDate = findHasNode(t1,t1_name)
    tempDate2 = findHasNode(t2,t2_name