September 2020
Intermediate to advanced
213 pages
5h 25m
Chinese
Content preview from 数据分析之图算法: 基于Spark和Neo4j
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路径查找算法和图搜索算法
｜
53
由于要求结果按降序排列（
DESC
），因此上述输出结果给出了关系最多的
10
对地点。
如果要计算最短加权路径，就不能将
null
作为第
1
个参数，可以传递含有最短路径计算所
需代价值的性质名称（
distance
）。利用该性质可以计算每对节点之间的最短加权路径。
下面的查询可实现上述操作：
CALL algo.allShortestPaths.stream("distance")
YIELD sourceNodeId, targetNodeId, distance
WHERE
sourceNodeId < targetNodeId
RETURN
algo.getNodeById(sourceNodeId).id
AS
source,
algo.getNodeById(targetNodeId).id
AS
target,
distance
ORDER BY
distance
DESC
LIMIT
10
该查询的返回结果如下所示：
source target distance
Doncaster Hoek van Holland 529.0
Rotterdam Doncaster 528.0
Gouda Doncaster 524.0
Felixstowe Immingham 511.0
Den Haag Doncaster 502.0
Ipswich Immingham 489.0
Utrecht Doncaster 489.0
London Utrecht 460.0
Colchester ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.