java 如何删除neo4j图中的所有关系？
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How to delete all relationships in neo4j graph?
提问by roman
I need to delete all relationships between all nodes. Is there any way to delete all relationships in the neo4j graph? Note that I am using ruby bindings - the neographygem.
There is no info about that in the wiki of the gem. I've also tried to find a way to do it in the neo4j documentation without any result.
我需要删除所有节点之间的所有关系。有没有办法删除neo4j图中的所有关系？请注意，我使用的是 ruby 绑定 - neographygem。gem 的 wiki 中没有关于此的信息。我还尝试在 neo4j 文档中找到一种方法，但没有任何结果。
Neo4j version is 1.7.2.
Neo4j 版本是 1.7.2。
回答by ulkas
in cypher:
在密码中：
deleting all relationships:
删除所有关系：
start r=relationship(*) delete r;
creating all relationships between all nodes, i'd assume:
在所有节点之间创建所有关系，我假设：
start n=node(*),m=node(*) create unique n-[r:RELTYPE]-m;
but you rather dont want to have too many vertices, since it collapse on low memory (at least in my case i got 1mil vertices and 1gb ram)
但是你不想有太多的顶点，因为它在低内存时崩溃（至少在我的情况下我有 100 万个顶点和 1gb ram）
回答by DachuanZhao
In cypher3.5, startis deprecated.
在 cypher3.5 中，start是deprecated.
You can use this cypher to delete all relationships
您可以使用此密码删除所有关系
match ()-[r]->() delete r;
