Question

我在图数据库，原始机场和目的地机场创建了2个节点。它与名为＆＃39; delayed_by＆＃39;的属性相关联。我需要将多个值关联到此属性＆＃39; delayed_by＆＃39;。延迟有多种原因，如天气延迟，载波延迟，延迟时间，我需要将它们全部链接到图形数据库中的此属性。我期待图形数据库

中表格格式以下的值

ORIGIN    DEST    carr_delay  weather_delay   nas_delay
ABE        ATL      492         56             56

我使用以下代码表示关系：

MATCH (origin:origin_airport {name: row.ORIGIN}), 
(destination:dest_airport {name: row.DEST})
CREATE (origin)-[:delayed_by {carr_delay: row.carr_delay}]->(destination)
CREATE (origin)-[:delayed_by {weather_delay: row.weather_delay}]->    
(destination)
CREATE (origin)-[:delayed_by {nas_delay: row.nas_delay}]->(destination)

但是delayed_by关系被映射了3次，它产生如下所示：

 ORIGIN    DEST    carr_delay  weather_delay   nas_delay
 ABE        ATL      492         NULL             NULL  

 ORIGIN    DEST    carr_delay  weather_delay   nas_delay
 ABE        ATL      NULL         56            NULL 

 ORIGIN    DEST    carr_delay  weather_delay   nas_delay
 ABE        ATL      NULL         NULL            56

我尝试使用下面的代码，如另一篇文章中所建议的那样，

 MATCH (origin:origin_airport {name: row.ORIGIN}), 
  (destination:dest_airport {name: row.DEST})
  CREATE (origin)
      -[:delayed_by {type: carr_delay, value: row.carr_delay}]->
      (destination)
  CREATE (origin)
      -[:delayed_by {type: weather_delay, value: row.weather_delay}]->
      (destination)
  CREATE (origin)
      -[:delayed_by {type: nas_delay, value: row.nas_delay}]->
      (destination)

但它不接受type：，value：属性，我在类型

时收到错误

Error: Client error: (400) Bad Request
Neo.ClientError.Statement.SyntaxError

如何在Neo4j中使用cypher查询向属性添加多个值？我通过将R连接到Neo4j来在R中编写这些查询。

Answer 1

这是LOAD CSV Cypher声明的样子 -

LOAD CSV WITH HEADERS FROM "file:///Users/luanne/temp/so.csv" AS row
MERGE (origin:origin_airport {name: row.ORIGIN})
MERGE (destination:dest_airport {name: row.DEST})
MERGE (origin)-[r:delayed_by]->(destination)
SET  r.carr_delay=row.carr_delay, r.weather_delay=row.weather_delay, r.nas_delay=row.nas_delay

您希望合并两个机场之间的关系，最终只有一个delayed_by关系。或者，如果每组机场都有一行，则可以将该关系的MERGE更改为CREATE。

Answer 2

你有一个错字，你忘记了引号：

  CREATE (origin)
      -[:delayed_by {type: carr_delay, value: row.carr_delay}]->
      (destination)

=＆GT;

  CREATE (origin)
      -[:delayed_by {type: "carr_delay", value: row.carr_delay}]->
      (destination)

如何使用Neo4j中的密码查询将多个值与属性相关联

2 个答案: