python使用py2neo创建neo4j的节点和关系

1.核心代码

使用py2neo连接neo4j的方法：

from py2neo import Graph

graph = Graph("http://localhost:7474", auth=("neo4j", "neo4j"))
graph.delete_all() # 删除已有的所有内容

根据dict创建Node：

from py2neo import Node

node = Node(**{"key":"value"})
graph.create(node)

创建关系：编程客栈

from py2neo import Relationship

relation = Relationship(node1, relation, node2)
graph.create(relation)

用到的工具函数是：

def create_relation(graph, match_node1: dict, match_node2: dict, relation: str, node1_label=None, node2_label=None):
  """自动创建节点与关系
  :param graph: 图
  :param match_node1: 节点1属性
  :p编程客栈aram match_node2: 节点2属性
  :param relation: 关系
  :param node1_label: 节点1的标签
  :param node2_label: 节点2的标签
  """
  from py2neo import Node, Relationship
  from 编程客栈py2neo import NodeMatcher

  node_matcher = NodeMatcher(graph)
  node1 = node_matcher.match(**match_node1).first()
  # 自动创建node
  if not node1:
    if node1_label:
      node1 = Node(node1_label, **match_node1)
    else:
      node1 = Node(**match_node1)
  node2 = node_matcher.match(**match_node2).first()
  if not node2:
    if node2_label:
      node2 = Node(node2_label, **match_node2)
    else:
      node2 = Node(**match_node2)
  # 创建关系
  relation = Relationship(node1, relation, node2)
  graph.create(relation)

2.完整示例代码

def create_relation(graph, match_node1: dict, match_node2: dict, relation: str, node1_label=None, node2_label=None):
  """自动创建节点与关系
  :param graph: 图
  :param match_node1: 节点1属性
  :param match_node2: 节点2属性
  :param relation: 关系
  :param node1_label: 节点1的标签
  :param node2_label: 节点2的标签
  """
  from py2neo import Node, RelationsEukEczUhip
  from py2neo import NodeMatcher

  node_matcher = NodeMatcher(graph)
  node1 = node_matcher.match(**match_node1).first()
  # 自动创建node
  if not node1:
    if node1_label:
EukEczU      node1 = Node(node1_label, **match_node1)
    else:
      node1 = Node(**match_node1)
  node2 = node_matcher.match(**match_node2).first()
  if not node2:
    if node2_label:
      node2 = Node(node2_label, **match_node2)
    else:
      node2 = Node(**match_node2)
  # 创建关系
  relation = Relationship(node1, relation, node2)
  graph.create(relation)


def main():
  from py2neo import Graph

  graph = Graph("http://localhost:7474", auth=("neo4j", "neo4j"))
  graph.delete_all() # 删除已有的所有内容
  create_relation(graph, {"name": "小a", "age": 12}, {"name": "小b", "age": 22}, "relation1", )
  create_relation(graph, {"name": "小a", "age": 12}, {"name": "小c", "age": 32}, "relation2", "people", "people")
  create_relation(graph, {"name": "小c", "age": 32}, {"name": "小d", "age": 42}, "relation1", "people", "people")


if __name__ == '__main__':
  main()

效果图：

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