我正在尝试从csv文件制作图表,但我无法在现有节点中添加其他关系。
我的实际代码是:
USING PERIODIC COMMIT 10000
LOAD CSV FROM 'my_file.csv' AS line
MERGE (p:Title { title: line[0]})
MERGE (a:Author { name: line[1]})
MERGE (a)-[:COLABORATE_IN]->(p)
WITH line WHERE line[2] IS NOT NULL
MERGE (b:Author {name: line[2]})
MERGE (b)-[:COLABORATE_IN]->(p) //not working
RETURN line[2]
它应该很简单,它可以很好地创建节点和第一关系,但对于第[2]行,它只是为新节点创建关系。我能做什么?
由于
答案 0 :(得分:1)
MERGE (a:Author { name: line[1]})
MERGE (a)-[:COLABORATE_IN]->(p)
WITH line WHERE line[2] IS NOT NULL
// p is no more available here
子句中未通过管道传输的所有内容都无法用于查询的下一部分:
p
只需添加USING PERIODIC COMMIT 10000
LOAD CSV FROM 'my_file.csv' AS line
MERGE (p:Title { title: line[0]})
MERGE (a:Author { name: line[1]})
MERGE (a)-[:COLABORATE_IN]->(p)
WITH p, line
WHERE line[2] IS NOT NULL
MERGE (b:Author {name: line[2]})
MERGE (b)-[:COLABORATE_IN]->(p) //not working
RETURN line[2]
标识符,即可在查询的其余部分中使用该标识符:
BufferedReader