Neo4j 中的标记子图

Question

我想为每个子图分配唯一的 ID。

LOAD CSV WITH HEADERS FROM 'file:///test.csv' AS row
MERGE (a: Name { name: row.col1 })
MERGE (b: desc { name: row.col2 })
MERGE (a)-[:count {cnt: row.count}]->(b)

RETURN a, b

期望的输出：

 uniqueid    |   group
----------------------------------

  123        |   B, flower, fruit

  234        |   A, tree

  345        |   D, milk

有人可以帮我吗？

Answer 1

您想使用 Graph Data Science Library and specifically the Weakly Connected components 算法。它完全符合您的要求：

The WCC algorithm finds sets of connected nodes in an undirected graph, where all nodes in the same set form a connected component.

要写回您可以使用的结果：

CALL gds.wcc.write({
    nodeProjection:'*',
    relationshipProjection:'*',
    writeProperty: 'componentId'
})
YIELD nodePropertiesWritten, componentCount;

然后检查结果：

MATCH (node)
RETURN node.componentId as uniqueId, 
       collect(node.name) as members

Answer 2

在 Neo4j v4.x 中有一个新功能可以实现您的目标。

LOAD CSV FROM 'your file' AS line
RETURN linenumber() AS number,{other items}

Neo4j v4 documentation

Neo4j 中的标记子图

labelling subgraph in Neo4j

neo4j

graph-databases