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6.14. Cypher Plugin

6.14.1. Send a Query
6.14.2. Return paths

The Neo4j Cypher Plugin enables querying with the Chapter 4, Cypher Query Language. The results are returned as a list of string headers (columns), and a data part, consisting of a list of all rows, every row consisting of a list of REST representations of the field value - Node, Relationship or any simple value like String.

6.14.1. Send a Query

Documentation not available

Cypher query

start x  = (5) return x.dummy

Final Graph:

Final-Graph-Send-a-Query.svg

Example request

  • POST http://localhost:7474/db/data/ext/CypherPlugin/graphdb/execute_query
  • Accept: application/json
  • Content-Type: application/json 
{"query": "start x  = (5) return x.dummy"}

Example response

  • 400: Bad Request
  • Content-Type: application/json 
{
  "message" : "dummy property not found for NodeImpl#5.",
  "exception" : "org.neo4j.graphdb.NotFoundException: dummy property not found for NodeImpl#5.",
  "stacktrace" : [ "org.neo4j.kernel.impl.core.Primitive.newPropertyNotFoundException(Primitive.java:173)", "org.neo4j.kernel.impl.core.Primitive.getProperty(Primitive.java:168)", "org.neo4j.kernel.impl.core.NodeProxy.getProperty(NodeProxy.java:145)", "org.neo4j.cypher.commands.PropertyValue.apply(Value.scala:94)", "org.neo4j.cypher.commands.PropertyValue.apply(Value.scala:88)", "org.neo4j.cypher.commands.ValueReturnItem.apply(ReturnItem.scala:38)", "org.neo4j.cypher.commands.ValueReturnItem.apply(ReturnItem.scala:37)", "org.neo4j.cypher.pipes.TransformPipe$$anonfun$foreach$1$$anonfun$3.apply(TransformPipe.scala:39)", "org.neo4j.cypher.pipes.TransformPipe$$anonfun$foreach$1$$anonfun$3.apply(TransformPipe.scala:39)", "scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:194)", "scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:194)", "scala.collection.LinearSeqOptimized$class.foreach(LinearSeqOptimized.scala:59)", "scala.collection.immutable.List.foreach(List.scala:45)", "scala.collection.TraversableLike$class.map(TraversableLike.scala:194)", "scala.collection.immutable.List.map(List.scala:45)", "org.neo4j.cypher.pipes.TransformPipe$$anonfun$foreach$1.apply(TransformPipe.scala:39)", "org.neo4j.cypher.pipes.TransformPipe$$anonfun$foreach$1.apply(TransformPipe.scala:38)", "org.neo4j.cypher.pipes.StartPipe$$anonfun$foreach$1.apply(StartPipe.scala:40)", "org.neo4j.cypher.pipes.StartPipe$$anonfun$foreach$1.apply(StartPipe.scala:39)", "scala.collection.LinearSeqOptimized$class.foreach(LinearSeqOptimized.scala:59)", "scala.collection.immutable.List.foreach(List.scala:45)", "org.neo4j.cypher.pipes.StartPipe.foreach(StartPipe.scala:39)", "org.neo4j.cypher.pipes.TransformPipe.foreach(TransformPipe.scala:38)", "org.neo4j.cypher.pipes.ColumnFilterPipe.foreach(ColumnFilterPipe.scala:34)", "scala.collection.TraversableLike$class.map(TraversableLike.scala:194)", "org.neo4j.cypher.pipes.Pipe.map(Pipe.scala:31)", "org.neo4j.cypher.ExecutionResult$class.javaIterator(ExecutionResult.scala:43)", "org.neo4j.cypher.ExecutionEngine$$anon$1.javaIterator(ExecutionEngine.scala:85)", "org.neo4j.cypher.javacompat.ExecutionResult.iterator(ExecutionResult.java:51)", "org.neo4j.server.rest.repr.CypherResultRepresentation.data(CypherResultRepresentation.java:54)", "sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)", "sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)", "sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)", "java.lang.reflect.Method.invoke(Method.java:597)", "org.neo4j.server.rest.repr.ObjectRepresentation$1.get(ObjectRepresentation.java:92)", "org.neo4j.server.rest.repr.ObjectRepresentation$PropertyGetter.putTo(ObjectRepresentation.java:131)", "org.neo4j.server.rest.repr.ObjectRepresentation.serialize(ObjectRepresentation.java:143)", "org.neo4j.server.rest.repr.MappingRepresentation.serialize(MappingRepresentation.java:42)", "org.neo4j.server.rest.repr.OutputFormat.format(OutputFormat.java:123)", "org.neo4j.server.rest.repr.OutputFormat.response(OutputFormat.java:100)", "org.neo4j.server.rest.repr.OutputFormat.ok(OutputFormat.java:48)", "org.neo4j.server.rest.web.ExtensionService.invokeGraphDatabaseExtension(ExtensionService.java:122)", "sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)", "sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)", "sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)", "java.lang.reflect.Method.invoke(Method.java:597)", "com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$ResponseOutInvoker._dispatch(AbstractResourceMethodDispatchProvider.java:187)", "com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispatcher.dispatch(ResourceJavaMethodDispatcher.java:71)", "com.sun.jersey.server.impl.uri.rules.HttpMethodRule.accept(HttpMethodRule.java:280)", "com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)", "com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceClassRule.java:108)", "com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)", "com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootResourceClassesRule.java:84)", "com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1341)", "com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1273)", "com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1223)", "com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1213)", "com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:414)", "com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:537)", "com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:699)", "javax.servlet.http.HttpServlet.service(HttpServlet.java:820)", "org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)", "org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:390)", "org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)", "org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)", "org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114)", "org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)", "org.mortbay.jetty.Server.handle(Server.java:326)", "org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)", "org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:943)", "org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:756)", "org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212)", "org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)", "org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:410)", "org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)" ]
}

6.14.2. Return paths

Paths can be returned together with other return types by just specifying returns.

Cypher query

start x  = (7) match path = (x--friend) return path, friend.name

Final Graph:

Final-Graph-return-paths.svg

Example request

  • POST http://localhost:7474/db/data/ext/CypherPlugin/graphdb/execute_query
  • Accept: application/json
  • Content-Type: application/json 
{"query": "start x  = (7) match path = (x--friend) return path, friend.name"}

Example response

  • 200: OK
  • Content-Type: application/json 
{
  "data" : [ [ {
    "start" : "http://localhost:7474/db/data/node/7",
    "nodes" : [ "http://localhost:7474/db/data/node/7", "http://localhost:7474/db/data/node/6" ],
    "length" : 3,
    "relationships" : [ "http://localhost:7474/db/data/relationship/3" ],
    "end" : "http://localhost:7474/db/data/node/6"
  }, "you" ] ],
  "columns" : [ "path", "friend.name" ]
}

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