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Question

每一行拆分操作我有這個疑問 -

LOAD CSV from "file:/C:/1m/movies1.csv" AS rows 
FIELDTERMINATOR ';' unwind rows as row 
foreach (r in row| 
SPLIT(r[3],"|") as genre 
merge (c:Genres { name: genre }) 
merge (m:Movies { MovieID: row[1] }) 
MERGE (m)-[:HAS_GENRE]->(c)) 

行都是這樣 -

1;Toy Story (1995);Animation|Children's|Comedy 
2;Jumanji (1995);Adventure|Children's|Fantasy 
3;Grumpier Old Men (1995);Comedy|Romance 
4;Waiting to Exhale (1995);Comedy|Drama 

所以每行的第三個元素有，我想放鬆多個值與'|'分隔符。但我得到錯誤 -

Invalid input 'P': expected 't/T' or 'e/E' (line 4, column 2 (offset: 108)) 
"SPLIT(r[3],"|") as genre" 

我怎麼每行中拆分第三項，並將它們添加合併到一個節點？

Answer 1

一般來說，FOREACH的東西可以用UNWIND來完成。

LOAD CSV from "file:/C:/1m/movies1.csv" AS rows FIELDTERMINATOR ';' 
MERGE (movie:Movie {MovieID:rows[0]}) 
SET movie.name = rows[1] 
WITH movie, SPLIT(rows[2], "|") AS genres 
UNWIND genres AS g 
MERGE (genre:Genre {name:g}) 
MERGE (movie)-[:HAS_GENRE]->(genre) 
RETURN movie, genre; 

產量：

也被提及rows[3]，這是空的。 csv文件只有3列，其中第三列用rows[2]訪問。