如何在Java中使用GremlinPipeLine sideEffect [英] How to use GremlinPipeLine sideEffect in java

问题描述

我想知道如何使用GremlinPipeLine在Java中实现以下gremlin查询g.V.has("mgrNo",T.neq,"0").sideEffect{g.V.has("empNo",it.mgrNo).next().addEdge("manages",it)}.

I would like to know how to implement the following gremlin query g.V.has("mgrNo",T.neq,"0").sideEffect{g.V.has("empNo",it.mgrNo).next().addEdge("manages",it)} in java using GremlinPipeLine .

从.next()开始实施时，我感到困惑.

I getting confused while implementing from the .next() onwards.

GremlinPipeline pipe = new GremlinPipeline(graph).V().has("mgrNo",T.neq,0).sideEffect(new PipeFunction<Vertex, Object>(){
    @Override
    public Object compute(Vertex vertex) {
        @SuppressWarnings("rawtypes")
        GremlinPipeline pipeline = (GremlinPipeline) new GremlinPipeline(graph).V().has("empNo", vertex.getProperty("mgrNo")).next();
        //code here 
        return pipeline;
    }
});

推荐答案

您几乎拥有了它，实际上您已经有太多的代码了.这应该为您工作:

You almost have it, actually you already have too much code. This should work for you:

new GremlinPipeline(graph).V().has("mgrNo",T.neq,0).sideEffect(new PipeFunction<Vertex, Object>(){
    @Override
    public Object compute(Vertex vertex) {
        @SuppressWarnings("rawtypes")
        Vertex mgr = (Vertex) new GremlinPipeline(graph).V().has("empNo", vertex.getProperty("mgrNo")).next();
        return mgr.addEdge("manages", vertex);
    }
}).iterate();

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