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从Neo4j图中获取给定跃点处的节点和关系

neo4j graph c#

Dr. Strangelove · 技术社区 · 4 年前

apoc.neighbors.byhop ,但不确定如何获取节点之间的关系。

A 连接到 C 通过 B1 B2 .输出 apoc.neights.byhop

merge (p1:Person {label:"A"})
merge (p2:Person {label:"B1"})
merge (p3:Person {label:"B2"})
merge (p4:Person {label:"C"})
merge (p1)-[:Knows]->(p2)
merge (p1)-[:Knows]->(p3)
merge (p2)-[:Knows]->(p4)

要以n跳距离检索节点,请执行以下操作:

match (p:Person {label:"A"})
call apoc.neighbors.byhop(p, "Knows", 3) 
yield nodes 
return nodes

返回不包含关系信息的如下对象。

[
   [
      {
         "identity":11,
         "labels":[
            "Person"
         ],
         "properties":{
            "label":"B1"
         }
      },
      {
         "identity":12,
         "labels":[
            "Person"
         ],
         "properties":{
            "label":"B2"
         }
      }
   ],
   [
      {
         "identity":0,
         "labels":[
            "Person"
         ],
         "properties":{
            "label":"C"
         }
      }
   ]
]

0 回复 | 直到 4 年前

jose_bacoy 4 年前

MATCH path=(p:Person {label:"A"})-[:Knows*1..]->(p2:Person)
WITH [n in nodes(path) where n <> p | n] as nodes, relationships(path) as relationships 
WITH size(nodes) as cnt, collect(nodes[-1]) as nodes, collect(distinct relationships[-1]) as relationships 
RETURN nodes, relationships

[
  {
    "nodes": [
      {
        "identity": 2,
        "labels": [
          "Person"
        ],
        "properties": {
"label": "B1"
        }
      },
      {
        "identity": 3,
        "labels": [
          "Person"
        ],
        "properties": {
"label": "B2"
        }
      }
    ],
    "relationships": [
      {
        "identity": 0,
        "start": 1,
        "end": 2,
        "type": "Knows",
        "properties": {

        }
      },
      {
        "identity": 1,
        "start": 1,
        "end": 3,
        "type": "Knows",
        "properties": {

        }
      }
    ]
  },
  {
    "nodes": [
      {
        "identity": 4,
        "labels": [
          "Person"
        ],
        "properties": {
"label": "C"
        }
      }
    ],
    "relationships": [
      {
        "identity": 2,
        "start": 2,
        "end": 4,
        "type": "Knows",
        "properties": {

        }
      }
    ]
  }
]