cypher

问题 I have the following APOC trigger which contains a apoc procedure. This works as desired but I am wondering if I used a lot of WITH statements, is that the way to go? or is there a better way to refactor this code. I am still new to neo4j so not sure. The control flow- Whenever the Enrollment node is created, it creates an SPerson node and depending on the size(number of SPerson nodes) it creates an enrolled or waitlist(if size>3, and deletes enrolled relation) relation with the course node.

问题 I have the following APOC trigger which contains a apoc procedure. This works as desired but I am wondering if I used a lot of WITH statements, is that the way to go? or is there a better way to refactor this code. I am still new to neo4j so not sure. The control flow- Whenever the Enrollment node is created, it creates an SPerson node and depending on the size(number of SPerson nodes) it creates an enrolled or waitlist(if size>3, and deletes enrolled relation) relation with the course node.

问题 I currently have a query that builds a relationship between Men nodes and People nodes: MATCH (m:Mem) UNWIND m.personID as person MERGE (p:Person{personID:person}) MERGE (m)-[:WITH]->(p) The Mem nodes contain an array of PersonIDs that I am unwinding and then matching to the Person nodes with the corresponding PersonIDs. However, the query is building the relationship with new Person nodes that it creates, with just the corresponding personIDs property (and no other properties) instead of

问题 Suppose I have a collection of 5 nodes in Neo4j, such that each node in the collection is connected to at least one other node in the collection. I want to extract the subgraph formed by the collection of nodes and their interactions from Neo4j. Currently, I'm using a really primitive method that involves attempting to find a match from each node in the system to every other node: MATCH p=(n)-[]->(m) WHERE id(n) IN [3,4,5,6,7] AND id(m) IN [3,4,5,6,7] RETURN relationships(p); However, this

问题 Suppose I have a collection of 5 nodes in Neo4j, such that each node in the collection is connected to at least one other node in the collection. I want to extract the subgraph formed by the collection of nodes and their interactions from Neo4j. Currently, I'm using a really primitive method that involves attempting to find a match from each node in the system to every other node: MATCH p=(n)-[]->(m) WHERE id(n) IN [3,4,5,6,7] AND id(m) IN [3,4,5,6,7] RETURN relationships(p); However, this

问题 We have following structure where User is starting point and nodes with numbers are labeled Invitation where its value specify their property id . I am looking for a way to create a query which moves node from list pointed by VALID_INVITATIONS relationship to another list pointed by INVALID_INVITATIONS. Moved node should be set first in new list. I came up with working solution but because of lack of knowledge and experience in Cypher I kindly ask you, the community for help and improvements

问题 I want to delete all indexes that exist using cypher in a bulk can it be done? I am using neo4j 3.4.7. DROP INDEX ON :Label(attributename) Does it replace existing indexes if I create the same index in a later stage? 回答1: A quick way to drop all indexes and constraints is to use the APOC procedure apoc.schema.assert, as follows: CALL apoc.schema.assert({},{},true) YIELD label, key RETURN * The procedure is mainly for ensuring that the DB has the indexes and constraints passed in the first 2

问题 I am adding constraints to a neo4j database using Cypher constraints and want to create a constraint which only applies to a subset of a node type. I can create a constraint that a foo field must exist on Entity with CREATE CONSTRAINT ON (e:Entity) ASSERT EXISTS (e.foo) but instead, I want to constrain only nodes with a given field. e.g CREATE CONSTRAINT ON (e:Entity {constrain_flag:true) ASSERT EXISTS (e.foo) For example, I may have two nodes like (e:Entity { foo: 'bar' , constrain_flag:

问题 I am trying to develop a product like a google drive. This is the second phase now. I am stuck in making cypher query and I need help. a user A can share a file/folder with a group or another user B. case 1: user A, shared the folder which consists of other subfolders. user B would see the shared folder. however, now user A shared a subfolder, and again user B should see only the root folder. case 2: user A, shared the only subfolder then, user B will only see a shared subfolder basically I

问题 I am trying to write a query to pull data from my Neo4J database. Lets say there are five conditions that determine whether or not I want to pull _____ from my database: A, B, C, D, and E. The boolean expression which determines this is: A && B && (C || D || E) From scouring the web, I cannot find any information about an order of operations that Neo4J AND and OR queries abide by (AND usually precedes OR), but from my observations they seem like they execute sequentially. Since there is no