Question

我正在关注http://neo4j.github.io/spatial/#rest-api-add-a-node-to-the-spatial-index的教程，用Neo4j 2.0M03测试Spatial 0.12。我正在尝试SimplePointLayer示例，以获取半径内的节点。

虽然看起来所有内容都是按照预期创建的（图层，索引等等），并且我的域节点已正确索引，但我的Cypher查询或我的java空间查询代码不会返回任何结果。

当我尝试使用Neo4j 1.9和Spatial 0.11完全相同的东西时，它的效果很好。

在深入研究这个问题之前，如果这是一个已知问题，我想先问Neo4j社区。提前谢谢。

- 根据彼得的评论测试步骤 -

geo_layer.json：

{
    "layer" : "geom",
    "lat" : "lat",
    "lon" : "lon"
}

curl -H "Content-Type: application/json" -X POST -d @geo_layer.json http://localhost:7474/db/data/ext/SpatialPlugin/graphdb/addSimplePointLayer

geo_index.json：

{
    "name" : "geom",
    "config" : {
            "provider" : "spatial",
            "geometry_type" : "point",
            "lat" : "lat",
            "lon":"lon"
            }
}

curl -H "Content-Type: application/json" -X POST -d @geo_index.json http://localhost:7474/db/data/index/node

geo_node.json：

{
    "lat" : 60.1,
    "lon" : 15.2
}

curl -H "Content-Type: application/json" -X POST -d @geo_node.json http://localhost:7474/db/data/node

新节点的ID是 5 - 我以空图开始。

domain_node.json：

{
    "value": "dummy",
    "key": "dummy",
    "uri": "http://localhost:7474/db/data/node/5"
}

curl -H "Content-Type: application/json" -X POST -d @domain_node.json http://localhost:7474/db/data/index/node/geom

cypher_query.json：

{
    "query": "start node = node:geom('withinDistance:[60.0,15.0, 100.0]') return node;"
}

curl -H "Content-Type: application/json" -X POST -d @cypher_query.json http://localhost:7474/db/data/cypher

结果：

{
  "message" : "org.neo4j.gis.spatial.indexprovider.GeoPipeFlowHits.iterator()Lorg/neo4j/graphdb/ResourceIterator;",
  "exception" : "AbstractMethodError",
  "fullname" : "java.lang.AbstractMethodError",
  "stacktrace" : [ "org.neo4j.cypher.internal.spi.gdsimpl.TransactionBoundQueryContext$NodeOperations.indexQuery(TransactionBoundQueryContext.scala:120)", "org.neo4j.cypher.internal.spi.DelegatingOperations.indexQuery(DelegatingQueryContext.scala:107)", "org.neo4j.cypher.internal.executionplan.builders.EntityProducerFactory$$anonfun$2$$anonfun$applyOrElse$2.apply(EntityProducerFactory.scala:70)", "org.neo4j.cypher.internal.executionplan.builders.EntityProducerFactory$$anonfun$2$$anonfun$applyOrElse$2.apply(EntityProducerFactory.scala:68)", "org.neo4j.cypher.internal.executionplan.builders.EntityProducerFactory$$anon$1.apply(EntityProducerFactory.scala:38)", "org.neo4j.cypher.internal.executionplan.builders.EntityProducerFactory$$anon$1.apply(EntityProducerFactory.scala:37)", "org.neo4j.cypher.internal.pipes.StartPipe$$anonfun$internalCreateResults$1.apply(StartPipe.scala:34)", "org.neo4j.cypher.internal.pipes.StartPipe$$anonfun$internalCreateResults$1.apply(StartPipe.scala:33)", "scala.collection.Iterator$$anon$13.hasNext(Iterator.scala:371)", "org.neo4j.cypher.internal.ClosingIterator$$anonfun$hasNext$1.apply$mcZ$sp(ClosingIterator.scala:36)", "org.neo4j.cypher.internal.ClosingIterator$$anonfun$hasNext$1.apply(ClosingIterator.scala:35)", "org.neo4j.cypher.internal.ClosingIterator$$anonfun$hasNext$1.apply(ClosingIterator.scala:35)", "org.neo4j.cypher.internal.ClosingIterator.failIfThrows(ClosingIterator.scala:84)", "org.neo4j.cypher.internal.ClosingIterator.hasNext(ClosingIterator.scala:35)", "org.neo4j.cypher.PipeExecutionResult.hasNext(PipeExecutionResult.scala:157)", "scala.collection.Iterator$$anon$11.hasNext(Iterator.scala:327)", "scala.collection.convert.Wrappers$IteratorWrapper.hasNext(Wrappers.scala:29)", "org.neo4j.cypher.PipeExecutionResult$$anon$1.hasNext(PipeExecutionResult.scala:73)", "org.neo4j.helpers.collection.ExceptionHandlingIterable$1.hasNext(ExceptionHandlingIterable.java:58)", "org.neo4j.helpers.collection.IteratorWrapper.hasNext(IteratorWrapper.java:42)", "org.neo4j.server.rest.repr.ListRepresentation.serialize(ListRepresentation.java:58)", "org.neo4j.server.rest.repr.Serializer.serialize(Serializer.java:75)", "org.neo4j.server.rest.repr.MappingSerializer.putList(MappingSerializer.java:61)", "org.neo4j.server.rest.repr.CypherResultRepresentation.serialize(CypherResultRepresentation.java:83)", "org.neo4j.server.rest.repr.MappingRepresentation.serialize(MappingRepresentation.java:42)", "org.neo4j.server.rest.repr.OutputFormat.assemble(OutputFormat.java:185)", "org.neo4j.server.rest.repr.OutputFormat.formatRepresentation(OutputFormat.java:133)", "org.neo4j.server.rest.repr.OutputFormat.response(OutputFormat.java:119)", "org.neo4j.server.rest.repr.OutputFormat.ok(OutputFormat.java:57)", "org.neo4j.server.rest.web.CypherService.cypher(CypherService.java:96)", "java.lang.reflect.Method.invoke(Method.java:601)", "org.neo4j.server.rest.security.SecurityFilter.doFilter(SecurityFilter.java:112)" ]

- 或者 -

location.json：

{
    "layer" : "geom",
    "node" : "http://localhost:7474/db/data/node/5"
}

curl -H "Content-Type: application/json" -X POST -d @location.json http://localhost:7474/db/data/ext/SpatialPlugin/graphdb/addNodeToLayer

geo_query.json：

{
    "layer" : "geom",
    "distanceInKm" : "100",
    "pointX" : "15",
    "pointY" : "60"
}

curl -H "Content-Type: application/json" -X POST -d @geo_query.json http://localhost:7474/db/data/ext/SpatialPlugin/graphdb/findGeometriesWithinDistance

返回空结果集。

Answer 1

确保在通过Cypher查询之前将节点添加到索引，因为这会在数据库中创建必要的结构，请参阅https://github.com/neo4j/spatial/blob/master/src/test/java/org/neo4j/gis/spatial/SpatialPluginFunctionalTest.java#L268

Neo4j 2.0M3 Spatial 0.12 - Spatial不会为我的查询返回任何结果

1 个答案: