JanusGraph Java无法添加顶点/边
我一直在尝试在 docker 中与我的 JanusGraph 设置进行交互。但经过多次尝试我仍然没有成功。
我如何连接到 JG。
public boolean connect() {
try {
graph = traversal().withRemote("path/to/janusgraph-cql-lucene-server.properties");
return true;
} catch (Exception e) {
log.error("Unable to create connection with graph", e);
return false;
}
}
我如何尝试添加顶点。看起来这并没有什么作用。
GraphTraversal<Vertex, Vertex> yt = graph.addV("link")
.property("url", "https://www.youtube.com/123")
.property("page_type", "contact");
GraphTraversal<Vertex, Vertex> fb = graph.addV("link")
.property("url", "https://www.facebook.com/456");
graph.tx().commit();
I've added a node with the gremlin console. This works, so the setup is not invalid or something like that. And when I fetch all nodes I in my application get a valid response.
System.out.println(graph.V().hasLabel("link").count().next()); //returns 1 (the node I added manually)
我的假设:
- 设置没问题,因为它在 gremlin 控制台连接中工作,
- 连接
- 一定没问题,因为初始化不会引发异常,并且我们得到了有效的计数响应。
我唯一不确定的是是否缺少我的事务提交。除了 graph.tx().commit();
我没有找到其他任何东西
,您能帮助我并告诉我我做错了什么吗?
I've been trying to create interact with my JanusGraph setup in docker. But after many tries I still don't succeed.
How I connect to JG.
public boolean connect() {
try {
graph = traversal().withRemote("path/to/janusgraph-cql-lucene-server.properties");
return true;
} catch (Exception e) {
log.error("Unable to create connection with graph", e);
return false;
}
}
How I try to add a vertex. It looks like this doesn't do anything.
GraphTraversal<Vertex, Vertex> yt = graph.addV("link")
.property("url", "https://www.youtube.com/123")
.property("page_type", "contact");
GraphTraversal<Vertex, Vertex> fb = graph.addV("link")
.property("url", "https://www.facebook.com/456");
graph.tx().commit();
I've added a node with the gremlin console. This works, so the setup is not invalid or something like that. And when I fetch all nodes I in my application get a valid response.
System.out.println(graph.V().hasLabel("link").count().next()); //returns 1 (the node I added manually)
My assumptions:
- Setup is alright because it works in the gremlin console
- connection
- connection must be alright because the initialization doesn't throw an exception and we get a valid count response.
The only thing I'm not sure about is if there's a transaction commit that I am missing. I didn't find any other than graph.tx().commit();
Could you please help me and tell me what I am doing wrong?
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GraphTraversal 对象只是一个要执行的“计划”。要使其生效,您需要一个关闭方法,如 next、toList 等,就像您对计数所做的那样。
造成混乱的原因可能是 gremlin 控制台自动按照配置的次数继续进行接下来的遍历。
The GraphTraversal object is only a "plan" to be carried out. To have it take effect, you need a closing method like next, toList, etc., like you did for the count.
The confusion probably arose from the fact that the gremlin console automatically keeps nexting the traversal a configured number of times.