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我将 a 的示例顶点 GraphSONg:Vertex放在一个文件中：

$ cat vertex.json 
{ "@type" : "g:Vertex", "@value" : { "id" : { "@type" : "g:Int32", "@value" : 1 }, "label" : "person", "properties" : { "name" : [ { "@type" : "g:VertexProperty", "@value" : { "id" : { "@type" : "g:Int64", "@value" : 0 }, "value" : "marko", "label" : "name" } } ], "location" : [ { "@type" : "g:VertexProperty", "@value" : { "id" : { "@type" : "g:Int64", "@value" : 6 }, "value" : "san diego", "label" : "location", "properties" : { "startTime" : { "@type" : "g:Int32", "@value" : 1997 }, "endTime" : { "@type" : "g:Int32", "@value" : 2001 } } } }, { "@type" : "g:VertexProperty", "@value" : { "id" : { "@type" : "g:Int64", "@value" : 7 }, "value" : "santa cruz", "label" : "location", "properties" : { "startTime" : { "@type" : "g:Int32", "@value" : 2001 }, "endTime" : { "@type" : "g:Int32", "@value" : 2004 } } } }, { "@type" : "g:VertexProperty", "@value" : { "id" : { "@type" : "g:Int64", "@value" : 8 }, "value" : "brussels", "label" : "location", "properties" : { "startTime" : { "@type" : "g:Int32", "@value" : 2004 }, "endTime" : { "@type" : "g:Int32", "@value" : 2005 } } } }, { "@type" : "g:VertexProperty", "@value" : { "id" : { "@type" : "g:Int64", "@value" : 9 }, "value" : "santa fe", "label" : "location", "properties" : { "startTime" : { "@type" : "g:Int32", "@value" : 2005 } } } } ] } } }

尝试将其读入 Python Gremlin Server：

from gremlin_python.process.anonymous_traversal import traversal 
from gremlin_python.driver.driver_remote_connection import DriverRemoteConnection 

g = traversal().withRemote(DriverRemoteConnection('ws://localhost:8182/gremlin','g')) 
g.io("/home/ubuntu/vertex.json").read().iterate()

产生错误：

GremlinServerError: 500: org.apache.tinkerpop.shaded.jackson.databind.JsonMappingException: 无法按要求反序列化 JSON 值。嵌套异常：java.lang.InstantiationException：无法将 JSON ('g:Vertex') 中包含的检测类型的值反序列化为对象映射器参数中指定的类型（接口 java.util.Map）。这些类型是不兼容的。在 [来源：（ByteArrayInputStream）；行：1，列：36]

我试过弄乱要指定的graphson_reader和message_serializer参数，但我无法克服那个错误。 DriverRemoteConnectionGraphSONSerializersV3d0

如何将上面的示例顶点 GraphSON 读入 Python 的 Gremlin 服务器的图形？

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1 回答 1

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您是如何创建 GraphSON 的？使用 TinkerGraph 创建一个简单的 GraphSON 文件并将您的文件与该文件进行比较以确保您的语法正确可能是值得的。我使用以下步骤创建了如下所示的 JSON。您示例中的 GraphSON 看起来更像是查询结果，而不是描述图形的文件。无论如何，这是一个例子：

gremlin> g.addV('test').property('name','some-name').property('age','some-age')
==>v[61015]
gremlin> g.io('test.json').write()   

{"id":{"@type":"g:Int64","@value":61015},"label":"test","properties":{"name":[{"id":{"@type":"g:Int64","@value":61016},"value":"some-name"}],"age":[{"id":{"@type":"g:Int64","@value":61017},"value":"some-age"}]}}

这是 Apache TinkerPop GraphSON 参考文档的链接。

http://tinkerpop.apache.org/docs/3.4.6/dev/io/#graphson

于 2020-04-10T13:35:50.057 回答