Question

因为Neo4j为每个返回对象返回一行，所以它可以返回具有重复属性的行。

如何将这组行转换为合适的数据结构？具体来说，我想梳理每一行并将重复值设置为属性，对于我希望不同的那些，将它们添加到数组中，以便最终得到更具可读性的内容。例如，转过这样的东西：

[
 [“event” = “My Event”, “creator” = “Adam”, “occurrence” = “1/2/3”],
 [“event” = “My Event”, “creator” = “Adam”, “occurrence” = “2/3/4”],
 [“event” = “My Event”, “creator” = “Adam”, “occurrence” = “3/4/5”],
 [“event” = “Event 2”, “creator” = “Someone”, “occurrence” = “4/2/3”],
 [“event” = “Event 2”, “creator” = “ Someone”, “occurrence” = “4/3/4”],
 [“event” = “Event 2”, “creator” = “ Someone”, “occurrence” = “6/4/5”],
]

以更可读和更混乱的方式：

[
 [“event” = “My Event”, “creator” = “Adam”, “occurrence” = [“1/2/3”, “2/3/4 ”, “3/4/5”]],
 [“event” = “Event 2”, “creator” = “ Someone”, “occurrence” = [“4/2/3”, “4/3/4”, “6/4/5”]]
]

更新：

这是我的查询，

MATCH (creator:CreatingUser)-[:creator]-(event:Event), (occurrence:EventSpaceTimeOccurrence)-[:occurrence]-(event)
WHERE creator.id = '1234'
RETURN event, creator, occurrence

我期待一个事件，一个eventType，一个创建者和多次出现。上面的查询给出了上面的结果，我想将其折叠到上面的非杂乱版本中。

Answer 1

在您编辑后，我会建议以下

MATCH (creator:CreatingUser)-[:creator]-(event:Event), (occurrence:EventSpaceTimeOccurrence)-[:occurrence]-(event)
RETURN event, creator, collect(occurrence) as eventoccurrences

这将导致每个事件和创建者的唯一组合一行，以及此组合的一系列事件。如果您只对特定属性感兴趣，那么您可以收集这些属性。例如，如果您有eventdate属性，则可以使用

RETURN event, creator, collect(occurrence.eventdate) as eventdates

现在，您将获得eventdate财产的集合。不幸的是，我不熟悉PHP语言驱动程序，所以不能建议一个函数。我知道在其他语言中有相应的收集。 HTH！

Neo4j - 将结果行分隔为逻辑组件

1 个答案: