FIND PATH
FIND PATH
语句查找指定起始点和目的点之间的路径。
语法
FIND { SHORTEST | ALL | NOLOOP } PATH FROM <vertex_id_list> TO <vertex_id_list>
OVER <edge_type_list> [REVERSELY | BIDIRECT] [UPTO <N> STEPS] [| ORDER BY $-.path] [| LIMIT <M>];
<vertex_id_list> ::=
[vertex_id [, vertex_id] ...]
SHORTEST
:查找最短路径。ALL
:查找所有路径。NOLOOP
:查找非循环路径。<vertex_id_list>
:点ID列表.多个点用英文逗号(,)分隔。支持$-
和$var
。<edge_type_list>
:边类型列表.多个边类型用英文逗号(,)分隔。*
表示所有边类型。REVERSELY | BIDIRECT
:REVERSELY
表示反向,BIDIRECT
表示双向。<N>
:路径的最大跳数。默认值为5
。<M>
:指定返回的最大行数。
限制
指定起始点和目的点的列表后,会返回起始点和目的点所有组合的路径。
搜索所有路径时可能会出现循环。
不支持过滤属性。
路径的查找是单线程,会占用很多内存。
示例
返回的路径格式类似于(<vertex_id>)-[:<edge_type_name>@<rank>]->(<vertex_id)
。
nebula> FIND SHORTEST PATH FROM "player102" TO "team204" OVER *;
+--------------------------------------------+
| path |
+--------------------------------------------+
| <("player102")-[:serve@0 {}]->("team204")> |
+--------------------------------------------+
nebula> FIND SHORTEST PATH FROM "team204" TO "player100" OVER * REVERSELY;
+--------------------------------------------+
| path |
+--------------------------------------------+
| <("team204")<-[:serve@0 {}]-("player100")> |
+--------------------------------------------+
nebula> FIND ALL PATH FROM "player100" TO "team204" OVER *;
+-------------------------------------------------------------------------------+
| path |
+-------------------------------------------------------------------------------+
| <("player100")-[:serve@0 {}]->("team204")> |
+-------------------------------------------------------------------------------+
| <("player100")-[:follow@0 {}]->("player125")-[:serve@0 {}]->("team204")> |
+-------------------------------------------------------------------------------+
...
nebula> FIND NOLOOP PATH FROM "player100" TO "team204" OVER *;
+--------------------------------------------------------------------------------------------------------+
| path |
+--------------------------------------------------------------------------------------------------------+
| <("player100")-[:serve@0 {}]->("team204")> |
+--------------------------------------------------------------------------------------------------------+
| <("player100")-[:follow@0 {}]->("player125")-[:serve@0 {}]->("team204")> |
+--------------------------------------------------------------------------------------------------------+
| <("player100")-[:follow@0 {}]->("player101")-[:serve@0 {}]->("team204")> |
+--------------------------------------------------------------------------------------------------------+
| <("player100")-[:follow@0 {}]->("player101")-[:follow@0 {}]->("player125")-[:serve@0 {}]->("team204")> |
+--------------------------------------------------------------------------------------------------------+
| <("player100")-[:follow@0 {}]->("player101")-[:follow@0 {}]->("player102")-[:serve@0 {}]->("team204")> |
+--------------------------------------------------------------------------------------------------------+
FAQ
是否支持WHERE子句,以实现图遍历过程中的条件过滤?
不支持WHERE子句,因此不能在遍历过程中进行条件过滤。