3
我正在一個查詢中創建多個關係。如果找不到第一個關係的匹配,則不創建第二個關係。如果兩個匹配都存在,那麼這兩個關係都有效Neo4j:創建多個關係不起作用
實施例:
假定 'MATCH1ID' 下面不存在,但 'MATCH2ID' 一樣。爲什麼會發生?
不起作用
MERGE (NewRecord:OBJECTNAME { Id: 'ABZDEFG' })
SET NewRecord.name='NEWNAME'
WITH NewRecord
MATCH (a)
WHERE a.Id = 'MATCH1ID'
CREATE (a)-[ar:Relationship1]->(NewRecord)
WITH NewRecord MATCH (b)
WHERE b.Id = 'MATCH2ID'
CREATE (b)-[br:Relationship2]->(NewRecord)
(如果我切換確實存在是先在它工作的順序節點的順序)
WORKS
MERGE (NewRecord:OBJECTNAME { Id: 'ABZDEFG' })
SET NewRecord.name='NEWNAME'
WITH NewRecord
MATCH (b)
WHERE b.Id = 'MATCH2ID'
CREATE (b)-[br:Relationship2]->(NewRecord)
WITH NewRecord
MATCH (a)
WHERE a.Id = 'MATCH1ID'
CREATE (a)-[ar:Relationship1]->(NewRecord)