Neo4j的：錯誤：在 「LOAD CSV」 中的R降價意想不到符號

Question

我正在讀[進口CSV數據進入的Neo4j] [1]，我試圖執行

library("RNeo4j") 
library("curl") 

graph <- startGraph("http://localhost:7474/db/data", username = "neo4j", password = "") 
clear(graph, input = F) 

LOAD CSV WITH HEADERS FROM "file:///data//airlines.csv" AS row 
CREATE (n:airlines) 
SET n = row, 
    n.carrier = toFloat(row.carrier), 
    n.name = toFloat(row.name) 

我得到了以下錯誤消息：

> > LOAD CSV WITH HEADERS FROM "file:///data//airlines.csv" AS row 
Error: unexpected symbol in "LOAD CSV" 
> CREATE (n:airlines) 
Error: could not find function "CREATE" 
> SET n = row, 
Error: unexpected symbol in "SET n" 
> n.carrier = toFloat(row.carrier), 
Error: unexpected ',' in " n.carrier = toFloat(row.carrier)," 
> n.name = toFloat(row.name) 
Error: could not find function "toFloat" 
> 

Answer 1

以熟悉的RNeo4j包，你應該檢查的自述RNeo4j GitHub repository和 reference manual。

你應該把你的查詢放在多行字符串中，並使用cypher函數。請注意，我在Cypher查詢中將引號更改爲撇號（'）。

我還刪除了curl庫的導入，因爲RNeo4j以傳輸方式導入它。

library("RNeo4j") 

graph = startGraph("http://localhost:7474/db/data", username = "neo4j", password = "") 
clear(graph, input = F) 

query = " 
LOAD CSV WITH HEADERS FROM 'file:///data//airlines.csv' AS row 
CREATE (n:airlines) 
SET n = row, 
    n.carrier = toFloat(row.carrier), 
    n.name = toFloat(row.name) 
" 
cypher(graph, query) 

請確保您提供的CSV文件的絕對路徑如圖所示Neo4j CSV Import Guide。