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[英]Neo4j - Graph Data Science library - How to cypher-query against a named graph in Graph Catalog?
[英]In Neo4j Graph Data Science, can I create graph by cypher with custom type name?
我从标签节点创建图表,其中创建的图表中的关系不是来自原始数据库的关系,而是一些代表标签的路径被标记在相同的视频上。
CALL gds.graph.create.cypher(
"tags",
"MATCH (t:Tag) RETURN id(t) AS id, labels(t) AS labels",
"
MATCH (t:Tag)
WITH collect(t) as nodes
UNWIND nodes as n
UNWIND nodes as m
WITH n, m WHERE id(n) < id(m)
MATCH (n)-[:TAGGED_ON]->(v:Video)<-[:TAGGED_ON]-(m)
RETURN id(n) AS source, id(m) AS target, count(v) AS weight
"
)
然后我这样做以导出到新数据库:
CALL gds.graph.export("tags", {dbName: "tags"})
CREATE DATABASE tags
但是,新标签数据库中的关系将全部命名为__ALL__
。
在图创建的relationshipQuery部分,neo4j的文档说
可选地,可以指定类型列来表示关系类型。
但是,我发现的所有关于此的示例都是type(r) AS type
,这不适用于我的情况。 我仍然可以通过以下方式重命名新标签数据库中的关系:
MATCH ()-[r]->()
WITH collect(r) AS rels
CALL apoc.refactor.rename.type("__ALL__", "TAGGED_ON_THE_SAME_VIDEO", rels)
YIELD committedOperations
RETURN committedOperations
但是我可以在 gds 图创建时使用自定义关系名称吗? 我尝试了类似"TAGGED_ON_THE_SAME_VIDEO" AS type
东西,但这行不通。
我尝试了类似“TAGGED_ON_THE_SAME_VIDEO”作为类型的东西,但这行不通。
为什么这行不通? 我已经测试过了,它工作得很好。 尝试使用以下查询来投影图形:
CALL gds.graph.create.cypher(
"tags",
"MATCH (t:Tag) RETURN id(t) AS id, labels(t) AS labels",
"
MATCH (t:Tag)
WITH collect(t) as nodes
UNWIND nodes as n
UNWIND nodes as m
WITH n, m WHERE id(n) < id(m)
MATCH (n)-[:TAGGED_ON]->(v:Video)<-[:TAGGED_ON]-(m)
RETURN id(n) AS source, id(m) AS target, count(v) AS weight, 'TAGGED_ON_THE_SAME_VIDEO' as type
"
)
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