如何获得Cypher中最近的节点？

Question

基于此处的模型，我正在尝试根据此模型中房间的接近程度找到最近的会议室。我想要这样的结果，

+-------+----------+--+
| Room  | Distance |  |
+-------+----------+--+
| room1 |        3 |  |
| room2 |        3 |  |
| room3 |        4 |  |
| room4 |        4 |  |
+-------+----------+--+

我的模特：

我试过这个查询：

MATCH (p:Person {name:"test"})-[r*2..]->(f:Floor)<-[:ROOM_LOCATED_IN_FLOOR]-(r:Room)
RETURN p, f, r

这只是给出了此人所在的会议室。但是我想遍历不同楼层的其他房间

Answer 1

这里是测试用的示例数据：

CREATE (p:Person)
CREATE (d:Desk)
CREATE (f1:Floor)
CREATE (f2:Floor)
CREATE (r1:Room {name : 'room1'})
CREATE (r2:Room {name : 'room2'})
CREATE (r3:Room {name : 'room3'})
CREATE (r4:Room {name : 'room4'})

CREATE (p)-[:SEATED_AT]->(d)-[:LOCATED_IN]->(f1)-[:HAS_NEXT]->(f2)
CREATE (f1)<-[:PART_OF]-(r1)
CREATE (f1)<-[:PART_OF]-(r2)
CREATE (f2)<-[:PART_OF]-(r3)
CREATE (f2)<-[:PART_OF]-(r4)

然后，您可以通过size() and relationships()函数得到想要的结果：

MATCH p = (:Person)-[*]-(r:Room)
RETURN r.name as Room, size( relationships(p) ) as Distance
ORDER BY Distance

输出将是：

╒═══════╤══════════╕
│"Room" │"Distance"│
╞═══════╪══════════╡
│"room1"│3         │
├───────┼──────────┤
│"room2"│3         │
├───────┼──────────┤
│"room3"│4         │
├───────┼──────────┤
│"room4"│4         │
└───────┴──────────┘

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