Question

似乎这个密码代码会导致此错误：此事务中已删除节点xxx。

MATCH (a:Address), (b:Address), (a)-[r:BelongTo]->(:Wallet), (b)-[:BelongTo]->(:Wallet)
WHERE a.AddId=b.AddId AND ID(a) > ID(b)

WITH r, a, b, a {.*, rel: r {.*, type:type(r)}} as snapshot
DELETE r
WITH a, b, snapshot     ------------------*
DELETE a                -------------------*
WITH b, snapshot

MERGE (c:Address {uniqueReferenceAddr:(...)})
ON CREATE SET c.AddId=snapshot.AddId,..."            
WITH c, b, snapshot
MATCH (wa:Wallet) WHERE snapshot.rel.primWallAddr=wa.primWallAddr
MERGE (c)-[r:BelongTo{uniqueReferenceBelongTo:(c.AddId + wa.primWallAddr)}]->(wa)
ON CREATE SET r.primWallAddr = wa.primWallAddr
WITH c, b 
MATCH (b)-[r0:BelongTo]->(wa:Wallet)
WITH wa, c, b, r0
MERGE (c)-[r1:BelongTo{uniqueReferenceBelongTo:(c.AddId + wa.primWallAddr)}]->(wa)
ON CREATE SET r1.primWallAddr = wa.primWallAddr
WITH b, r0
DELETE r0 
WITH b
DELETE b

当删除标有*的两行时，抛出此错误：无法删除节点xxx（与前面提到的错误中的ID相同），因为仍然存在与之关联的关系。（沿着那条线的东西）

可能相关的数据：

(id:13557)
primWallAddr    1MEe2mebed8wopvy8xyjjHcEQHUPVJn2UC
multiExist  false
first_seen  2014-09-29T20:03:42
addr_tag_link   null
last_seen   2017-02-03T05:48:14
addr_tag    null
uniqueReferenceAddr 1ERfjthAH9T3PDtFcpkzudha89ABkD9RgSnullnull1MEe2mebed8wopvy8xyjjHcEQHUPVJn2UCfalse
AddId   1ERfjthAH9T3PDtFcpkzudha89ABkD9RgS


b: (id: 13563)
primWallAddr    1KumbRsTcA6UNqU2MHEfqEFnAZYU3w3izR
multiExist  false
first_seen  2014-09-29T20:03:42
addr_tag_link   null
last_seen   2017-02-03T05:48:14
addr_tag    null
uniqueReferenceAddr 1ERfjthAH9T3PDtFcpkzudha89ABkD9RgSnullnull1KumbRsTcA6UNqU2MHEfqEFnAZYU3w3izRfalse
AddId   1ERfjthAH9T3PDtFcpkzudha89ABkD9RgS

(id: 13564)
primWallAddr    1Lsqcv4cg5zUctNi2qwNxMkrv1GeBboSUJ
multiExist  false
first_seen  2014-09-29T20:03:42
addr_tag_link   null
last_seen   2017-02-03T05:48:14
addr_tag    null
uniqueReferenceAddr 1ERfjthAH9T3PDtFcpkzudha89ABkD9RgSnullnull1Lsqcv4cg5zUctNi2qwNxMkrv1GeBboSUJfalse
AddId   1ERfjthAH9T3PDtFcpkzudha89ABkD9RgS

此处显示的所有节点都是地址节点，所有这些节点都与一个（且只有一个）称为:BelongTo的钱包节点有关系。

设置地址和钱包节点的约束：

CREATE CONSTRAINT ON (addr:Address) ASSERT addr.uniqueReferenceAddr IS UNIQUE

CREATE CONSTRAINT ON (wa:Wallet) ASSERT wa.primWallAddr IS UNIQUE

用于生成地址节点的Cypher代码：

LOAD CSV... as line
MERGE (a:Address {uniqueReferenceAddr:(...)})
ON CREATE SET a.AddId=line[0],...

用于生成钱包节点的Cypher代码：

LOAD CSV... as line
MERGE (w:Wallet { primWallAddr:line[0]})
ON CREATE SET w.first_seen = line[1]...

用于将地址节点链接到相应钱包节点的Cypher代码：

MATCH (addr:Address), (wa:Wallet) WHERE addr.primWallAddr=wa.primWallAddr
MERGE (addr)-[r:BelongTo{uniqueReferenceBelongTo:(...)}]->(wa)
ON CREATE SET ...

在运行这三个查询后运行第一个查询。

有没有人知道是什么原因？

Neo4j错误：此事务中已删除节点xxx

0 个答案: