neo4j

问题 I have the following query that uses plain relationship operations for node filtering: MATCH (dg:DecisionGroup)-[:CONTAINS]->(childD:Decision) WHERE dg.id = 1 MATCH (childD)-[relationshipValueRel2:HAS_VALUE_ON]->(filterCharacteristic2:Characteristic) WHERE filterCharacteristic2.id = 2 WITH relationshipValueRel2, childD, dg WHERE (ANY (id IN [".NET"] WHERE id IN relationshipValueRel2.value )) RETURN childD.name which returns only one node(as it was expected): "Candidate1" PROFILE output: I'd

问题 I was trying to change a property to a node using MATCH (n:User) where n.firstname = 'Mark' set n.school = 'MIT' return n but I got this error: Neo.ClientError.Transaction.TransactionHookFailed Why are we getting this error? The neo4j documentation does not contain any explanation for this. Thank you. 回答1: try merge MATCH (n:User) where n.firstname = 'Mark' merge n.school = 'MIT' ; you won't have any return, you should re query using match ... return as per https://neo4j.com/docs/cypher

问题 I have the following entity: @NodeEntity public class Value { @Properties(prefix = "property", allowCast = true) private Map<String, Object> properties; } I have added the following properties: Map<String, Object> properties1 = new HashMap<>(); properties.put("key1", "one"); properties.put("key2", "two"); value.setProperties(properties1); Right now on the database level, I have the Value node with two properties: property.key1 = "one" property.key2 = "two" Now, I'd like to update the

问题 Sample Data Sample Query: At the end of this post Objective: Searches similar to 'who knows exactly 2 Cust and works at 1 company' Step 1 : I just did a print of the number of connected Cust and Comp and its all good till now MATCH (from:Cust), (a:Cust), (b:Comp), p1=((from)-[r1]-(a)), p2=((from)-[r2]-(b)) WITH from, count(DISTINCT a) as knows, count(DISTINCT b) as works RETURN from.title, knows, works Step 2 : I went and added WHERE clause to filter the count, so far so good MATCH (from:Cust

问题 Having successfully created a spatial index, created a node and added it to my index, I'd now like to be able to delete the node (easy) and remove it from the spatial index (not so easy). At time of writing, the documentation does not cover this. Looking at the index i can see what to clear up, but on my simple DB i'm not confident if this is a protocol to follow or just a rule of thumb. My node (within the index) is two "rtree" relationships away from the root of the layer, which i can clean

问题 I'm using Neo4j 3.0.5. My query looks as follows: MATCH (cd:ConnectionDay)-[c:Connection]->() WHERE id(cd)= { id } AND c.departure <= { departure } RETURN c In my graph, the number of Connection relations is very high and I'm looking for a way to speed up the retrieval. Is there a way to create an index for the departure property? I'm using the Embedded Java API anyway, so solutions that aren't using Cypher are ok, too. 回答1: Aside: It is not recommended that you use native neo4j IDs to find

问题 I am using correct NEO4J_URL environment variable as shown in heroku config . If I use the same neo4j url via a browser, it works fine (no auth failure). However my application fails to start with below error on heroku. (I am using spring-data-neo4j) The URL looks like http://username:password@123456ac6.hosted.neo4j.org:1234/db/data/ . Tried without '/db/data' at the end and also with and without trailing slash. Didn't help. Please help if anyone has already faced/resolved this issue. The

问题 I have a chart that will represent hierarchy for nodes like this one. Lets say that this one is representing the complete hierarchy but I also need to create intermediate result by grouping at different levels. Suppose I'm requesting data for node A. I wish to regroup nodes at the nearest Group relationship. I'd to get something like this: Basically users will be allowed to associate nodes to group and I need to represent the data in the convenient way to display an Org Chart. I don't know

问题 Right now I'm designing a system with Neo4j database where I have to be able to have a query check if a Date property in a node is before, equal or after the provided Date . How should I store the Date inside of Neo4j Node property to be able to do a comparison with Cypher query based for example on simple operators like == , > , < Is it okay to store Date like Long timestamp ? Will it work this way ? If no, please suggest a better decision. UPDATED Queries I have tried with no luck: MATCH

问题 My import.csv creates many nodes and merging creates a huge cartesian product and runs in a transaction timeout since the data has grown so much. I've currently set the transaction timeout to 1 second because every other query is very quick and is not supposed to take any longer than one second to finish. Is there a way to split or execute this specific query in smaller chunks to prevent a timeout? Upping or disabling the transaction timeout in the neo4j.conf is not an option because the