Tinkerpop Stack Rexster REST API _properties

Tinkerpop Stack Rexster REST API _properties

技术栈:

目标:

我想利用基于 API 的 Rexster RESTful 来查询和遍历我的图形数据库。我正在尝试了解用于根据顶点查询语法过滤结果的 _properties 查询参数。

顶点查询结果:

http://localhost:8182/graphs/mygraph/vertices { "version": "2.5.0", "results": [ { "name": "Frank Stein", "_id": 25600768, "_type": "vertex" }, { "name": "John Doe", "_id": 25600512, "_type": "vertex" } ], "totalSize": 2, "queryTime": 219.86688 }

边查询结果:

http://localhost:8182/graphs/mygraph/vertices

{ "version": "2.5.0", "results": [ { "_id": "f8q68-f8phc-4is5-f8pog", "_type": "edge", "_outV": 25600512, "_inV": 25600768, "_label": "friends" } ], "totalSize": 1, "queryTime": 164.384768 }

问题:

这些 URI 不会 return 我假设我会得到 returned,总是 return 一个空集。:

请求数:

_http://localhost:8182/graphs/privvy/vertices/25600768/both?properties=[[name,=,"John Doe"]] _http://localhost:8182/graphs/privvy/vertices/25600768/both?properties=[[name,=,John Doe]] _http://localhost:8182/graphs/privvy/vertices/25600768/both?properties=[[name,=,(s,"John Doe")]] _http://localhost:8182/graphs/privvy/vertices/25600768/both?properties=[[name,=,(s,John Doe)]]

回应:

{ "version": "2.5.0", "results": [], "totalSize": 0, "queryTime": 22.641152 }

附加信息:

如果我只是将 =(等于运算符)切换为 <>(不等于)运算符,以下 URI 会 return 一组相邻顶点的结果:

请求:

_http://localhost:8182/graphs/privvy/vertices/25600768/both?properties=[[name,<>,"John Doe"]]

回应:

{ "version": "2.5.0", "results": [ { "name": "John Doe", "_id": 25600512, "_type": "vertex" } ], "totalSize": 1, "queryTime": 17.451008 }

有人知道我可能哪里出错了吗?

参考文献:

谢谢朋友!

汤姆

在您提供的 link 中,明确注明此部分:

https://github.com/tinkerpop/blueprints/wiki/Vertex-Query#query-use-cases

请注意,涉及的所有用例 "edges"。您正在尝试对边的相邻顶点上的 属性 值进行顶点查询。如果您希望查询以这种方式工作,则必须对数据进行非规范化以在边缘包含 "name" 属性。

请注意,在我针对下面的默认图形的卷曲请求中,当我针对 "weight"(和边 属性)构建顶点查询时,一切都按预期工作:

$ curl -g "http://localhost:8182/graphs/tinkergraph/vertices/1/out?_properties=[[weight,=,(f,0.4)]]"
{"version":"2.5.0","results":[{"name":"lop","lang":"java","_id":"3","_type":"vertex"}],"totalSize":1,"queryTime":1.070072}