问题描述
在DSE图中,顶点的唯一ID似乎是community_id。
It seems that the unique id for vertices is community_id in DSE Graph.
我发现这可行(id长):
I have found that this works (id is long) :
v = g.V().has("VertexLabel","community_id",id).next()
没有一项工作:
v = g.V("community_id",id).next()
v = g.V("community_id","VertexLabel:"+id).next()
v = g.V(id).next()
v = g.V().hasId(id).next()
v = g.V().hasId("VertexLabel:"+id).next()
v = g.V("VertexLabel:"+id).next()
编辑
经过一些调查,我发现对于顶点v,v.id()返回LinkedHashMap:
After some investigation I found that for a vertex v, v.id() returns a LinkedHashMap:
Vertex v = gT.next();
Object id = v.id();
System.out.println(id);
System.out.println(id.getClass());
System.out.println(g.V().hasId(id).next());
System.out.println(g.V(id).next());
上面的照片:
{~label=User, community_id=1488246528, member_id=512}
class java.util.LinkedHashMap
v[{~label=User, community_id=1488246528, member_id=512}]
v[{~label=User, community_id=1488246528, member_id=512}]
应该有一种更简洁的方法...
可以得到任何帮助:)
There should be a more concise way ...any help is appreciated :)
推荐答案
实际上我找到了它:
id可以用以下字符串形式编写: vertexLabel:community_id:member_id
ids can be written in this String form: "vertexLabel:community_id:member_id"
因此,对于上面的示例 id = User:1488246528:512
:
So for the example above id="User:1488246528:512"
:
v = g.V().hasId("User:1488246528:512").next()
v = g.V("User:1488246528:512").next()
返回特定的顶点
现在我不知道如何以简洁的方式打印顶点的ID(作为字符串)的好方法,以便可以在V()或hasId()中使用它。 o是:
Till now I don't know of a good way how to print concisely the id (as a string) of a Vertex so it can be used in V() or in hasId() .. what I currently do is:
LinkedHashMap id = ((LinkedHashMap)v.id());
String idStr = v.label()+":"+id.get("community_id")+":"+id.get("member_id");
这篇关于如何以简洁的方式在Datastax DSE 5.0图形中按顶点ID查询?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!