删除 ne4j 1.8中的所有节点和关系

我知道这个问题已经被很多人问过了
为了我的研究，这里有一些以前提出的问题

  1. 如何删除新4j 图中的所有关系？
  2. Https://groups.google.com/forum/#!topic/neo4j/lgiaespguge

但毕竟，还是不能解决我们的问题,
我们只想删除“所有”节点和“所有”关系

enter image description here

假设删除“所有”可以看到有留下的 0节点0属性和0关系

这是我在执行论坛建议的删除“所有”后截图

我的问题仍然是相同的，如何删除所有节点和所有关系在 neo4j

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小开

you are probably doing it correct, only the dashboard shows just the higher ID taken, and thus the number of "active" nodes, relationships, although there are none. it is just informative.

to be sure you have an empty graph, run this command:

START n=node(*) return count(n);
START r=rel(*) return count(r);

if both give you 0, your deletion was succesfull.

小开
最佳答案

As of 2.3.0 and up to 3.3.0

MATCH (n)
DETACH DELETE n

Docs

Pre 2.3.0

MATCH (n)
OPTIONAL MATCH (n)-[r]-()
DELETE n,r

Docs

小开

It will do the trick..

Match (n)-[r]-()
Delete n,r;
小开

for a big database you should either remove the database from the disk (after you stop the engine first I guess) or use in Cypher something like:

MATCH (n)
OPTIONAL MATCH (n)-[r]-()
WITH n,r LIMIT 50000
DELETE n,r
RETURN count(n) as deletedNodesCount

see https://zoomicon.wordpress.com/2015/04/18/howto-delete-all-nodes-and-relationships-from-neo4j-graph-database/ for some more info I've gathered on this from various answers

小开

Neo4j cannot delete nodes that have a relation. You have to delete the relations before you can delete the nodes.

But, it is simple way to delete "ALL" nodes and "ALL" relationships with a simple chyper. This is the code:

MATCH (n) DETACH DELETE n

--> DETACH DELETE will remove all of the nodes and relations by Match

小开

if the name of node is for example : abcd then below query will work :

MATCH (n:abcd)
DETACH DELETE n

This will only delete the node with label "abcd" and all its relation-ships.

小开

Probably you will want to delete Constraints and Indexes


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