我正在尝试通过从Java运行OrientDb命令来获取多个值。具体来说,我试图获得一个链接到顶点和边缘@rid
的顶点列表。
例如,如果顶点V1通过边缘E1链接到顶点V2,则我对V1的查询应该返回E1和V2的@rid
。
我可以通过运行查询在Orient Studio中执行此操作:
select @rid, expand(in) from ExampleEdge where out = '#14:33'
如何在Java中编写上述查询?所有示例仅显示单值结果,如:
Iterable<Vertex> vertexes = graph.command(new OCommandSQL("select expand(in()) from node where @rid = '#14:33'")).execute();
答案 0 :(得分:0)
我有这个简单的结构:
获取RIDS,您可以使用此代码:
String yourRid = "#12:0";
Iterable<Vertex> targets = g.command(new OSQLSynchQuery<Vertex>("select from ?")).execute(yourRid);
for (Vertex target : targets) {
Iterable<Edge> r = target.getEdges(Direction.IN, "exampleEdge");
List<Edge> results = new ArrayList<Edge>();
CollectionUtils.addAll(results, r.iterator());
System.out.println("Starting Vertex: "+yourRid);
System.out.println();
for (Edge result:results){
System.out.println("Edge "+result.getId()+" connected with Vertex "+result.getVertex(Direction.OUT).getId());
}
}
<强>输出强>:
Starting Vertex: #12:0
Edge #13:3 connected with Vertex #12:1
Edge #13:4 connected with Vertex #12:2
Edge #13:5 connected with Vertex #12:3