neo4j Neo.ClientError.Transaction.TransactionHookFailed

问题

I was trying to change a property to a node using

MATCH (n:User) where n.firstname = 'Mark' set n.school = 'MIT' return n

but I got this error:

Neo.ClientError.Transaction.TransactionHookFailed

Why are we getting this error? The neo4j documentation does not contain any explanation for this. Thank you.

回答1:

try merge

MATCH (n:User) 
  where n.firstname = 'Mark' 
merge n.school = 'MIT' ;

you won't have any return, you should re query using match ... return

as per https://neo4j.com/docs/cypher-refcard/current/ §merge

Match a pattern or create it if it does not exist. Use ON CREATE and ON MATCH for conditional updates.

MERGE (n:Person {name: $value})
  ON CREATE SET n.created = timestamp()
  ON MATCH SET
    n.counter = coalesce(n.counter, 0) + 1,
    n.accessTime = timestamp()

来源：https://stackoverflow.com/questions/47925772/neo4j-neo-clienterror-transaction-transactionhookfailed