neo4j

问题 I'm having a trouble with mapping an object Employee to my database when invoking a default method in my Employee repository. I get an argument type mismatch when invoking an employeerepository.findall() method Employee repository package org.jarivm.relationGraph.repositories; import org.jarivm.relationGraph.domains.Employee; import org.jarivm.relationGraph.domains.Project; import org.springframework.data.neo4j.annotation.Query; import org.springframework.data.neo4j.repository.GraphRepository

问题 I am trying to create friend relationship to all the ids in the list but I am getting an error: y already declared (line 2, column 41 (offset: 64)) "Merge (y:User{id:"21",name:"b"}) Merge (y:User{id:"41",name:"d"}) Merge (y:User{id:"51",name:"e"}) " ^ Neo.ClientError.Statement.InvalidSyntax I am trying to create a new user with id,name,year and also relationship with existing node at the same time .How can I do it ?Is there any other way also?I really appreciate any help. MATCH (u:User {id:"2

问题 I'm using Postgresql + Neo4j for my project. I need to rollback postgres queries if neo4j query has failed. So, I need to catch Neo4jException in my code. But couldn't done yet. Thanks for help. require_once('pgconnect.php'); try{ $conn->beginTransaction(); //some pgsql code $conn->commit(); require_once('neoconnect.php'); $result = $client->run("a query"); $conn = null; } catch(PDOException $e){ require_once('pgrollback.php'); } this is my working code. But as you can see I don't have a

问题 Is it possible to return in a single cypher query distinct nodes and edges of a specific path. For instance, using the movies graph the query below return separately movies and actors, I'd like to return all nodes together. using path p = (...) and nodes(p) actually returns pairs of nodes regardless the use of distinct. match (m:Movie {name: "Rain"}) -- (p:Person) return {nodes: collect(distinct {name: m.title}), actors: collect(distinct {name: a.name}), links: collect({source: m.title,

问题 Struggling this after replacing neo4j-jdbc client with Apache http client. Seems like we still have issues when running only 1k concurrent users that execute our query. This is how we using the client: https://gist.github.com/IdanFridman/1989b600a0a032329a5e this is how we execute the query using that rest-client: https://gist.github.com/IdanFridman/22637f95ba696f498b6c after profiling we see the above bad performance results: With avg latency of 3 seconds per request. Should we ditch neo4j?

问题 Getting error when running my grails app that is connecting to Neo4j Error initializing the application: Error creating bean with name 'neo4jDatastore': FactoryBean threw exception on object creation; nested exception is com.sun.jersey.api.client.ClientHandlerException: java.net.ConnectException: Connection refused Message: Error creating bean with name 'neo4jDatastore': FactoryBean threw exception on object creation; nested exception is com.sun.jersey.api.client.ClientHandlerException: java

问题 Hi I am trying to experiment with Neo4j server plugins. The pom.xml file that I am using is exactly the same as in - https://github.com/neo4j/neo4j/blob/2.1.3/community/server-examples/pom.xml And the server plugin extension that I am experimenting with is - https://github.com/neo4j/neo4j/blob/2.1.3/community/server-examples/src/main/java/org/neo4j/examples/server/plugins/GetAll.java This works fine, but then I decide to make some calls to the Jung library from GetAll.java. So I simply add

问题 Im using neo4j to store information about maps and sensors. Every time the map or sensor layout changes I need to keep a copy. I can imagine querying and manually creating said copy but I'm wondering if it's possible to build a neo4j type query that would do this for me. So far all I've come up with is a way to replicate the nodes in a given label: match ( a:some_label { some_params }) with a create ( b:some_label ) set b=a,b.other_id=value; This would allow me to put version and time stamp

问题 I'm trying to write a "Hello, World" with Spring Data Neo4j in a standalone app. It runs and actually creates the Neo4j database, but my @Autowired repo is not being initialized. I suspect the problem is in my main class, but I don't know what to try. Unsurprisingly, almost all the Spring tutorials I've found are about web apps. What am I doing wrong? config bean: @Configuration @EnableNeo4jRepositories(basePackages = "test2") public class ConfigBean extends Neo4jConfiguration { private

问题 Neo4j server consumes very less RAM initially, but after processing some requests. The RAM consumed by the server increases. Even though no query is been processed it keeps using the RAM. While on restarting the server the RAM consumed is less again. This states that neo4j server is keeping some data in the RAM, and even though the request is been processed the data still stays in the RAM. Is there anyway to clear that data in the RAM at some threshold to avoid server crash? 回答1: Did you have