如何在SimplePointLayer空间中创建Neo4J？

Question

我在堆栈上看到了几篇文章，这些文章展示了如何创建simplePointLayer。然而，这个过程对我来说是失败的。我使用的是Neo4J版本3.0.2和空间插件版本3.0.2。

我曾经是这里，这里和这里。

这些页面中的每一个都包含相同的创建SimplePointLayer的指令集，如下所示。

这一步对我来说很好：

POST /db/data/ext/SpatialPlugin/graphdb/addSimplePointLayer HTTP/1.1
Host: localhost:7474
Accept: application/json
Content-Type: application/json
Cache-Control: no-cache

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

我不知道在哪里可以看到层的列表，但是响应是200，所以我假设这里的一切都像预期的那样工作。

以下是我被困的地方：

POST /db/data/index/node/ HTTP/1.1
Host: localhost:7474
Accept: application/json
Content-Type: application/json
Cache-Control: no-cache

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

我将上面的json放在一个文件tmp.json中，然后运行

cat tmp.json | http :7474/db/data/index/node

这将生成以下消息：

HTTP/1.1 400 Bad Request
Access-Control-Allow-Origin: *
Content-Length: 6887
Content-Type: application/json; charset=UTF-8
Date: Wed, 06 Jul 2016 18:14:18 GMT
Server: Jetty(9.2.9.v20150224)

{
    "errors": [
        {
            "code": "Neo.DatabaseError.General.UnknownError", 
            "message": "No index provider 'spatial' found. Maybe the intended provider (or one more of its dependencies) aren't on the classpath or it failed to load.", 
/*
* 提示：该行代码过长，系统自动注释不进行高亮。一键复制会移除系统注释 
* "stackTrace": "java.lang.IllegalArgumentException: No index provider 'spatial' found. Maybe the intended provider (or one more of its dependencies) aren't on the classpath or it failed to load.\n\tat org.neo4j.kernel.NeoStoreDataSource$1.apply(NeoStoreDataSource.java:386)\n\tat org.neo4j.kernel.NeoStoreDataSource$1.apply(NeoStoreDataSource.java:378)\n\tat org.neo4j.kernel.impl.index.LegacyIndexStore.findIndexConfig(LegacyIndexStore.java:105)\n\tat org.neo4j.kernel.impl.index.LegacyIndexStore.getOrCreateIndexConfig(LegacyIndexStore.java:171)\n\tat org.neo4j.kernel.impl.index.LegacyIndexStore.getOrCreateNodeIndexConfig(LegacyIndexStore.java:64)\n\tat org.neo4j.kernel.impl.api.StateHandlingStatementOperations.nodeLegacyIndexCreateLazily(StateHandlingStatementOperations.java:1475)\n\tat org.neo4j.kernel.impl.api.OperationsFacade.nodeLegacyIndexCreateLazily(OperationsFacade.java:1195)\n\tat org.neo4j.kernel.impl.coreapi.IndexProviderImpl.getOrCreateNodeIndex(IndexProviderImpl.java:52)\n\tat org.neo4j.kernel.impl.coreapi.IndexManagerImpl.forNodes(IndexManagerImpl.java:81)\n\tat org.neo4j.server.rest.web.DatabaseActions.createNodeIndex(DatabaseActions.java:381)\n\tat org.neo4j.server.rest.web.RestfulGraphDatabase.jsonCreateNodeIndex(RestfulGraphDatabase.java:845)\n\tat sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)\n\tat sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)\n\tat sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)\n\tat java.lang.reflect.Method.invoke(Method.java:498)\n\tat com.sun.jersey.spi.container.JavaMethodInvokerFactory$1.invoke(JavaMethodInvokerFactory.java:60)\n\tat com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$ResponseOutInvoker._dispatch(AbstractResourceMethodDispatchProvider.java:205)\n\tat com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispatcher.dispatch(ResourceJavaMethodDispatcher.java:75)\n\tat org.neo4j.server.rest.transactional.TransactionalRequestDispatcher.dispatch(TransactionalRequestDispatcher.java:144)\n\tat com.sun.jersey.server.impl.uri.rules.HttpMethodRule.accept(HttpMethodRule.java:302)\n\tat com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)\n\tat com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceClassRule.java:108)\n\tat com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)\n\tat com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootResourceClassesRule.java:84)\n\tat com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1542)\n\tat com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1473)\n\tat com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1419)\n\tat com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1409)\n\tat com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:409)\n\tat com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:558)\n\tat com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:733)\n\tat javax.servlet.http.HttpServlet.service(HttpServlet.java:790)\n\tat org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:808)\n\tat org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1669)\n\tat org.neo4j.server.rest.web.CollectUserAgentFilter.doFilter(CollectUserAgentFilter.java:69)\n\tat org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)\n\tat org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:585)\n\tat org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:221)\n\tat org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1127)\n\tat org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:515)\n\tat org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)\n\tat org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1061)\n\tat org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)\n\tat org.eclipse.jetty.server.handler.HandlerList.handle(HandlerList.java:52)\n\tat org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)\n\tat org.eclipse.jetty.server.Server.handle(Server.java:497)\n\tat org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:310)\n\tat org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:257)\n\tat org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:540)\n\tat org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635)\n\tat org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:555)\n\tat java.lang.Thread.run(Thread.java:745)\n"
*/
        }
    ], 
    "exception": "IllegalArgumentException", 
    "fullname": "java.lang.IllegalArgumentException", 
    "message": "No index provider 'spatial' found. Maybe the intended provider (or one more of its dependencies) aren't on the classpath or it failed to load.", 
    "stackTrace": [
        "org.neo4j.kernel.NeoStoreDataSource$1.apply(NeoStoreDataSource.java:386)", 
        "org.neo4j.kernel.NeoStoreDataSource$1.apply(NeoStoreDataSource.java:378)", 
        "org.neo4j.kernel.impl.index.LegacyIndexStore.findIndexConfig(LegacyIndexStore.java:105)", 
        "org.neo4j.kernel.impl.index.LegacyIndexStore.getOrCreateIndexConfig(LegacyIndexStore.java:171)", 
        "org.neo4j.kernel.impl.index.LegacyIndexStore.getOrCreateNodeIndexConfig(LegacyIndexStore.java:64)", 
        "org.neo4j.kernel.impl.api.StateHandlingStatementOperations.nodeLegacyIndexCreateLazily(StateHandlingStatementOperations.java:1475)", 
        "org.neo4j.kernel.impl.api.OperationsFacade.nodeLegacyIndexCreateLazily(OperationsFacade.java:1195)", 
        "org.neo4j.kernel.impl.coreapi.IndexProviderImpl.getOrCreateNodeIndex(IndexProviderImpl.java:52)", 
        "org.neo4j.kernel.impl.coreapi.IndexManagerImpl.forNodes(IndexManagerImpl.java:81)", 
        "org.neo4j.server.rest.web.DatabaseActions.createNodeIndex(DatabaseActions.java:381)", 
        "org.neo4j.server.rest.web.RestfulGraphDatabase.jsonCreateNodeIndex(RestfulGraphDatabase.java:845)", 
        "java.lang.reflect.Method.invoke(Method.java:498)", 
        "org.neo4j.server.rest.transactional.TransactionalRequestDispatcher.dispatch(TransactionalRequestDispatcher.java:144)", 
        "org.neo4j.server.rest.web.CollectUserAgentFilter.doFilter(CollectUserAgentFilter.java:69)", 
        "java.lang.Thread.run(Thread.java:745)"
    ]
}

我不知道从这里往哪里走。我假设“提供者”就是插件。我不是JAVA人，所以我不知道如何处理类路径。在知道如何处理这个问题之前，有人遇到过这个错误吗？

Answer 1

由于在Neo4j 3.0中引入了用户定义的过程，空间库目前处于某种程度的变化之中。具体地说：

1. 过程正在成为与空间交互的推荐方式，并且
2. 索引提供程序已从空间库中删除(导致所遇到的错误)

通过这些过程，您现在可以从Cypher访问空间功能：

创建层

CALL spatial.addPointLayer('cities');

将所有城市添加到层

MATCH (c:City)
WITH collect(c) AS cities
CALL spatial.addNodes('cities',cities) YIELD node
RETURN count(*)

发现距离的城市

MATCH (c:City {name:"Berlin"}) WITH c
CALL spatial.distance('cities', c , 200) YIELD node, distance
RETURN node.name AS name, round(distance) AS dist

有关更多信息，请参见这。