[英]How do I get all nodes that do not contain (relate) nodes with certain property in Cypher Neo4j
[英]How can I create relationships in neo4j/Cypher from a csv that depend on the type of nodes?
我正在尝试将 csv 导入 Neo4j ,其中包含人、组织、银行、资产等之间的关系,其中每行只有一个关系。 列名是FROM、A.Type、TO、B.type ,然后是不同的属性。 在这里,from 和 to 标签有名字,AB.type 表示它是否属于一个人、组织等。
我设法根据FOREACH
的类型创建节点(大约 3500 个),如下所示:
FOREACH (_ IN CASE WHEN line.`A.type` = 'ASSET' THEN [1] ELSE [] END | MERGE (asset:Asset {Name:line.FROM}))
FOREACH (_ IN CASE WHEN line.`A.type` = 'BANK' THEN [1] ELSE [] END | MERGE (bank:Bank {Name: line.FROM}))
. . .
FOREACH (_ IN CASE WHEN line.`B.type` = 'ACTIVO' THEN [1] ELSE [] END | MERGE (asset:Asset {Name:line.TO}))
FOREACH (_ IN CASE WHEN line.`B.type` = 'BANCO' THEN [1] ELSE [] END | MERGE (bank:Bank {Name: line.TO}))
. . .
我现在的问题是创建每行的关系,我尝试了许多不同的方法,但似乎没有任何效果。 例如:
FOREACH
更改为两个不同的节点,具体取决于它们是在 FROM 还是 TO 列上:WITH 'link' as line
LOAD CSV WITH HEADERS FROM url AS line
WITH line WHERE line.FROM = 'ASSET' AND line.TO = 'ORGANIZATION'
MERGE (a1:Asset {Name:line.FROM})
MERGE (o2:Organization {Name:line.TO})
CREATE (a1)-[con:PROPERTY_OF]->(o2)
FOREACH(n IN (CASE WHEN line.`A.type` = 'ASSET' THEN [1] ELSE [] END) | FOREACH(t IN CASE WHEN line.`B.type` = 'ORGANIZATION' THEN [1] ELSE [] END | MERGE (asset)-[ao:CONNECTED_WITH]->(organization)))
WITH asset, organization, line
CALL apoc.create.relationship(asset, line.RelationshipType, NULL, organization) YIELD rel
RETURN asset, rel, organization
以及每个的不同变体,从头开始创建节点或匹配它们。 每次查询似乎有效时,它都会运行,但它不会创建任何关系,或者它会在 csv 中不存在的新节点之间创建单一关系,没有名称或 label。
我对 Cypher/Neo4j 完全陌生,并且不知所措,如果有人能指出我的错误以及如何纠正它们,将不胜感激。
先感谢您!
A.type
和B.type
。MERGE
子句替换为MATCH
子句。MERGE
而不是CREATE
来创建关系。例如:
LOAD CSV WITH HEADERS FROM 'file:///' AS line
CALL apoc.do.case([
line.`A.type` = 'ASSET' AND line.`B.type` = 'ORGANIZATION',
'MATCH (a:Asset {Name: line.FROM}), (b:Organization {Name: line.TO}) MERGE (a)-[:FOO]->(b) RETURN a, b',
line.`A.type` = 'ASSET' AND line.`B.type` = 'BANCO',
'MATCH (a:Asset {Name: line.FROM}), (b:Bank {Name: line.TO}) MERGE (a)-[:FOO]->(b) RETURN a, b',
line.`A.type` = 'BANK' AND line.`B.type` = 'ACTIVO',
'MATCH (a:Bank {Name: line.FROM}), (b:Asset {Name: line.TO}) MERGE (a)-[:FOO]->(b) RETURN a, b'
],
'', // empty ELSE case
{line: line}
) YIELD value
RETURN value
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