cypher

问题 I am wondering how I get access to my (example)dataset that I have on Neo4j through Javascript, i.e. I have a movie dataset, so I would like to get and receive queries through an local html page? As you might wonder, I am a very beginner to this and I really appreciate it if someone would explain it to me step by step :) Thanks in advance 回答1: You can access your Neo4j graph database through the http transactional endpoint http://neo4j.com/docs/stable/rest-api-transactional.html and issue

问题 I'm looking for a way to generate unique identifiers for all my nodes/relationships in Neo4j, based on an incrementing counter (not big long uuids). The internal ids maintained by the Neo4j engine are known not to be reliable as outside references. A solution that comes close is the code proposed in this question, but it doesn't work when a single CREATE clause creates multiple new nodes: // get unique id MERGE (id:UniqueId{name:'Person'}) ON CREATE SET id.count = 1 ON MATCH SET id.count = id

问题 I'm experiencing surprisingly slow retrieval of results with ResourceIterator<Node> when I get results from Cypher query execution in Java. next() command takes on average 156ms, with standard deviation of 385! Is this behavior expected, or am I doing something wrong? Can anybody suggest a more efficient way of achieving the same thing? Graph structure I have the following graph layout, where Point nodes have LinksTo relations to other points: Node:Point Properties: - idPoint (new style

问题 ... or is it possible at all to create a node in Neo4j which has a relationship with itself (a simple loop-node)? If so, what would be the corresponding Cypher query? 回答1: The following query creates Peter who voted for himself. MERGE (peter:User { name: "Peter" }) MERGE (peter)<-[:VOTED_FOR]-(peter) RETURN peter 来源： https://stackoverflow.com/questions/22185212/how-do-you-create-self-referential-nodes

问题 I've recently asked about how to find all paths between two types os nodes in a way where all the edges in the path had the same attribute (like the same ID). This would be something like: MATCH (a {type: 'cin1'})-[rels:Next*1.. {value: 1}]->(b {type: 'cancer'}) RETURN (a), (b) where instead of having value: 1 I would have value: same for all edges . I found a way to solve this by using something like this (as answered in my other question): MATCH (a:Label {type: 'cin1'}) MATCH (b:Label {type

问题 I am completely new to Neo4j. I am testing the graph database and I have the following simple graph test-structure: different labeled nodes with properties, which are connected. All the nodes have a property, which is called access. It is a list of string elements such as: {access: ['http', 'www']} I'm searching for a solution, where I get all nodes from a starting node which are connected (doesn't matter which type or direction) and their relationship where an intersection on the access

问题 In Neo4J I have a @NodeEntity Person . I'd like to be able to also add additional labels such as :USER , :CUSTOMER , :OWNER , :AGENT , etc. It seems that spring-data-neo4j:3.0.0-RELEASE has support for an @Labels annotation, but I get a NullPointerException when trying to use it. @NodeEntity public class Person { @GraphId Long id @Indexed(unique=true) String email @Labels // <- Seems this is unsupported. private Collection<String>labels public void addLabel(String label) { this.labels.add

问题 It seems Neo4j intentionally omits cycles so a query like: MATCH (n1)-[:R]->(n2)<-[:R]-(n1) RETURN n1, n2; Always returns nothing unless there are two relations with type R between n1 and n2 (which is absolutely possible and a bad hack). But I have a scenario in which this cycle might happen and it's desired: MATCH (n1)-[:R]->(n2)<-[:R]-(n3) RETURN n1, n2, n3; In this query, n1 and n3 might be the same node or different ones and it all depends on the data (both are valid). One way to

问题 I am currently getting to know Neo4j and the abilities of a graph database. I also did the movie tutorial that comes with neo4j. Now I have to work on a big database (~135 GB, 500 mio. nodes, 950 mio. relationships) and want to add an index for a special type of nodes. This type of nodes, called Transaction, has a property called txid, which is a hash and looks like this: a56e849c19dfecbe93c9e8bfca8e6df0902775c9ecc2e082eea80436c3d93a51 I try to add the index with the cypher query: CREATE

问题 I am in great need of some advice regarding an issue I'm running into with a Neo4j unmanaged extension that I'm building in Java. I have created a very simple code sample that highlights my issue. The basic premise is that I'd like to set the org.neo4j.server.webserver.limit.executiontime for the neo4j server to a reasonable amount of time for user queries (lets say 2 minutes) which are coming in through Cypher, other endpoints, etc. But I also have some batch jobs that I need to run through