neo4j

Neo4j Shortest Path for specific node labels in-between the path

由 时光怂恿深爱的人放手 提交于 2021-02-19 00:53:06
问题 I'm looking for a hint to solve the following issue: Given a Neo4j DB with two node types applied as labels :Address and :Milestone (one for each node) Between the different nodes there are directed :LEADS_TO relationships. Given the following pattern (I skipped the [ ] for the relations): Pattern 1: (a:Address)->(:Milestone)->(:Milestone)<-(:Milestone)<-(:Milestone)<-(b:Address) Pattern 2: (a:Address)->(:Milestone)->(c:Address)<-(:Milestone)<-(b:Address) I'm looking for a query that only

Neo4j入门之中国电影票房排行浅析

由 旧城冷巷雨未停 提交于 2021-02-18 01:48:58
什么是Neo4j?   Neo4j是一个高性能的NoSQL图形数据库（Graph Database），它将结构化数据存储在网络上而不是表中。它是一个嵌入式的、基于磁盘的、具备完全的事务特性的Java持久化引擎，但是它将结构化数据存储在网络(从数学角度叫做图)上而不是表中。Neo4j也可以被看作是一个高性能的图引擎，该引擎具有成熟数据库的所有特性。   作为图形数据库，Neo4j最让人惊喜的功能就是它可以直观地展示图，也就是节点与节点之间的关系，当然，它还有其它的优势，比如： 很容易表示连接的数据； 检索/遍历/导航更多的连接数据是非常容易和快速的； 能轻松地表示半结构化数据； Neo4j CQL查询语言命令类似于SQL，可读性好，容易学习； 使用简单而强大的数据模型； 不需要复杂的连接来检索连接的/相关的数据。   在本文中，笔者希望能够通过一个简单的例子来展示Neo4j的使用以及它的强大之处，这无疑更适合于初学者，因为笔者也是刚入门。   以下，笔者并不会过多地介绍Neo4j的操作，只是希望读者能对Neo4j的功能有直观的感受，至于教程之类的，可以参考文章最后的参考文献。   下面，让我们进入本次的Neo4j之旅~ 项目展示   由于《流浪地球》的大热以及笔者对此的欣赏，因此，此次的项目为分析中国电影票房排行。我们的数据来自于百度百科，用 爬虫 得到我们需要的数据

Cypher dynamic relationship with conditional APOC procedure?

由 前提是你 提交于 2021-02-17 05:34:05
问题 I am learning cypher and trying to find out a way to create dynamic relationship when a condition passes. Here is an example: we have single node: (n2) and another node which has unknown relationship of TEMP_1 or TEMP_2 with its child: (n1)------[TEMP_1 or TEMP_2]------>(child) we want to create relationship between (n2) and (child) if it exists (n2)------[TEMP_1 or TEMP_2]------>(child) Here is query: MATCH (n1: NODE_1) MATCH (n2: NODE_2) OPTIONAL MATCH (n1)-[rel:TEMP_1|TEMP_2]->(child) CALL

Bean validation is not working spring data neo4j

由 情到浓时终转凉″ 提交于 2021-02-16 18:23:06
问题 I am using SDN with embedded neo4j. i have to use bean validate, but it not working.null is saving in database without any exception. Dependency is dependencies { // specify dependencies here under either 'build', 'compile', 'runtime', 'test' or 'provided' scopes e.g. // runtime 'mysql:mysql-connector-java:5.1.29' // runtime 'org.postgresql:postgresql:9.3-1101-jdbc41' test "org.grails:grails-datastore-test-support:1.0-grails-2.4" compile 'org.springframework.data:spring-data-neo4j:3.2.0

Does Karate supports Neo4j Database?

由 六月ゝ 毕业季﹏ 提交于 2021-02-13 17:38:54
问题 Want to know if Karate supports Neo4j database ?. If yes, would like to have an ex. feature which will be helpful. 回答1: Karate supports any Java code so that way indirectly you should be able to do anything you want. Please look at this JDBC example which will get you started: dogs.feature. You will need to write a little bit of Java code (one time only) so if you don't have that skill, please ask someone to help. # use jdbc to validate * def config = { username: 'sa', password: '', url:

Does Karate supports Neo4j Database?

由 泄露秘密 提交于 2021-02-13 17:38:51
问题 Want to know if Karate supports Neo4j database ?. If yes, would like to have an ex. feature which will be helpful. 回答1: Karate supports any Java code so that way indirectly you should be able to do anything you want. Please look at this JDBC example which will get you started: dogs.feature. You will need to write a little bit of Java code (one time only) so if you don't have that skill, please ask someone to help. # use jdbc to validate * def config = { username: 'sa', password: '', url:

Neo4J 4 + Apoc : Unable to set up injection for procedure 'Static'

由 若如初见. 提交于 2021-02-11 17:54:35
问题 Getting the following error on neo4j server startup with the apoc plugin. Have copied the jar to the plugins folder. Caused by: org.neo4j.kernel.api.exceptions.ComponentInjectionException: Unable to set up injection for procedure 'Static', the field 'apocConfig' has type 'class apoc.ApocConfig' which is not a known injectable component Neo4j version: 4.0.4 Apoc version: 4.0.0.13 What could be the problem? 回答1: I would suggest reviewing the installation procedure to see if you missed any steps

Can Graph DBs perform well with unspecified end nodes?

由 核能气质少年 提交于 2021-02-11 16:11:38
问题 I have been experimenting with neo4j for a very specific scenario and I have been unable to get it to perform well - queries take minutes to return. I am wondering if this is a case of the wrong technology for the job? A simplified version of my scenario is below. I have Town s that are linked to each other via routes. Each route has a distance. The question I'm trying to ask is: calculate the shortest route from Town A to every other town reachable from Town A . In this scenario, there are

Why is findOne(<id>, <depth>) getting unacceptably slow performance when adding more nodes of the same label?

由 寵の児 提交于 2021-02-11 13:01:44
问题 CONTEXT I've been developing a spring boot website backed by a Neo4j database. It is designed to work as a university course search system. (the relevant structure is that courses have modulesets, that have modules, that are related to subjects, etc...) @JsonIdentityInfo(generator=JSOGGenerator.class) public class Course extends DomainObject { @NotNull private String name; @NotNull private String courseCode; private String description; private School school; @Convert(AttendanceTypeConverter

Add new Geometries to an osm file in Neo4J

由 ▼魔方 西西 提交于 2021-02-11 11:46:13
问题 Hi im trying to add some restaurants to an importet .osm file. So I want to save the restaurants as new Point Geometries and connect them at the right point with the existing osm graph. Later I want to read out all resturants and find the nearest restaurant from any given point. So should I add the restaurants in a new layer? And is there an easy way to connect the restaurants with the graph at the right geogaphical point?? Thanks for answers Greetings 回答1: There are two options: Edit the
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