neo4j

NoClassDefFoundError when executing a Neo4j Cypher query in Java

由 倾然丶 夕夏残阳落幕 提交于 2019-12-06 13:33:49
问题 I tried the following basic example about executing Cypher queries from Java in embedded mode as is, but it shows the errors below: Code: package test; import org.neo4j.cypher.javacompat.ExecutionEngine; import org.neo4j.cypher.javacompat.ExecutionResult; import org.neo4j.graphdb.GraphDatabaseService; import org.neo4j.graphdb.Node; import org.neo4j.graphdb.Transaction; import org.neo4j.graphdb.factory.GraphDatabaseFactory; public class Test { public static void main(String[] args) {

Creating relationship with name as a variable. (RDBMS to Neo4J migration)

由 ∥☆過路亽．° 提交于 2019-12-06 13:30:52
问题 I'm trying to migrate our current data set to Neo4J and was fairly successful so far until I reach this problem. I'm trying to create a set of relationships between 2 node where the name of the relationship is a variable. In my MySQL database, I have Role object which map to a pair of (Resource, Action) so I'm trying to convert it to Neo4J with data model such as (Role)-[Action]->(Resource) . This is what I have but this doesn't seem like valid syntax: USING PERIODIC COMMIT LOAD CSV WITH

Generating friendly id sequence in Neo4j

由 耗尽温柔 提交于 2019-12-06 13:27:57
问题 I have a bunch of relationships where I would like to create a friendly id for the child objects so that I can have friendlier URLs. Every time I create a child object for a particular parent object I would like to automatically include a friendly id which increments sequentially. So the first child would have friendly id 1, the second would have friendly id 2, etc. I don't want to reuse id's if children are deleted. To complicate matters, there are many such relationships that I would like

Neo4j下载与使用

由 女生的网名这么多〃 提交于 2019-12-06 12:58:55
Neo4j 官网 : https://neo4j.com/ Neo4j 国内： http://neo4j.com.cn/topic/5b003eae9662eee704f31cee http://we-yun.com/index.php/blog/releases-56.html 1.neo4j介绍 neo4j是基于Java语言编写图形数据库。图是一组节点和连接这些节点的关系。图形数据库也被称为图形数据库管理系统或GDBMS。详细介绍可看Neo4j 教程 2.安装Java jdk jdk1.8安装 neo4j是用Java语言编写的图形数据库，运行时需要启动JVM进程，因此，需安装JAVA SE的JDK。JAVA SE JDK下载 安装好后，配置一下环境变量 cmd输入java -version检查是否安装好 3.下载安装neo4j 从官网下载最新版 Neo4j 社区版（Community） Neo4j应用程序有如下主要的目录结构： bin目录：用于存储Neo4j的可执行程序； conf目录：用于控制Neo4j启动的配置文件； data目录：用于存储核心数据库文件； plugins目录：用于存储Neo4j的插件； 4.创建系统环境变量 --- 配不配都可以，不配置需要切换到目录，再运行命令 创建主目录环境变量NEO4J_HOME，并把主目录设置为变量值。

What's the difference between Maven plugins and dependencies?

由 ▼魔方 西西 提交于 2019-12-06 12:54:38
问题 I am using Neo4j and MongoDB with Grails, and I want to know whether the Maven Neo4j plugin also provides the Neo4j dependencies to my build. Similarly for MongoDB. I am confused. What should I used, plugins or dependencies? What is the difference? 回答1: Dependencies are artifacts (i.e. a jar) that your project requires to be available in its classpath at some point in time (i.e. at compile time or runtime) A plugin however is an artifact that you can configure in your project to have it

Neo4j Match Node Property OR Relationship Property

由 北慕城南 提交于 2019-12-06 12:40:01
问题 I'm trying to write a query that will return nodes that either match a node property or a relationship property. For instance, I want all nodes where the name property is George OR if the relationship property status is "good". I have two queries that will get the nodes for each of these: MATCH (n) where n.name = 'George' return n MATCH (n)-[r]-() where r.status = 'good' return n Is there a singe query I could write to get these combined results? I thought I could use this optional query

Using Neo4J Spatial Cypher queries with other conditions

由 六眼飞鱼酱① 提交于 2019-12-06 12:21:09
I am using Neo4J Spatial cypher queries to find users in a 25KM radius, and among them find those who have the same hometown as I do. I used the following query: START u=node(5),node=node:geom('withinDistance:[17.3,78.3,25.0]') MATCH (u)-[:hometown]->()<-[:hometown]-(o) RETURN o; This query doesn't work the way I intended. It identifies all user nodes in the given radius and executes the same MATCH query, which is specific to user with node ID 5, for each of those nodes. Splitting this problem into two parts, this is what I would like to combine. First part, identify all users in a 25 KM

Get connected graphs in neo4j by using cypher query

由 半腔热情 提交于 2019-12-06 12:19:56
问题 How can we modify the cypher query so that it can give all the connected graphs (means the set of nodes and relationships that are connected to each other directly or indirectly) as a result for the query. OR Can I use traversal framework for my requirement? The use case is: I need to get all the connected graphs from neo4j and store their information as an "cluster" in other database. 1 group of connected graph = 1 cluster . I need to separate the connected graphs and then store the

Stored procedure in neo4j 3.0

由 时光毁灭记忆、已成空白 提交于 2019-12-06 12:10:18
问题 I'm using neo4j 3.0 on Windows and I try to use stored procedures new feature. I have built the apoc.jar from github sources. This jar is copied into plugins repository ( C:\Program Files\Neo4j Community\plugins ) I get a Neo.ClientError.Procedure.ProcedureNotFound error when I try to call any apoc stored procedure from neo4j browser. I tried to follow this post, but dbms configuration parameter does not work for me... 回答1: I was having the same problem but then I came to know that I was

centos下neo4j安装和设置开机自启动.

由 旧城冷巷雨未停 提交于 2019-12-06 12:08:52
centos下neo4j安装和设置开机自启动. 1. 资源准备 CentOS 7.4 jdk 1.8+ neo4j-community-3.5.13 https://neo4j.com/artifact.php?name=neo4j-community-3.5.13-unix.tar.gz 2. 安装neo4j 安装jdk1.8（略） 上传neo4j安装包到服务器/opt目录下，并解压 tar -zxvf neo4j-community-3.5.13-unix.tar.gz 修改neo4j配置文件 conf/neo4j.conf，只需要修改使neo4j可以外网访问即可，其他按默认配置，大概70行左右，找到配置去掉前面的“#” dbms.connectors.default_listen_address=0.0.0.0 进入neo4j安装程序bin目录，启动neo4j ./neo4j start 到页面浏览 http://localhost:7474。如果出现页面表示neo4j安装成功，初始化账号密码为neo4j/neo4j 3. 设置neo4j开机启动 进入neo4j安装目录，并创建脚本start.sh和stop.sh，其中JAVA_HOME按照自己的实际路径填写 vim start.sh #!/bin/bash export JAVA_HOME=/opt/jdk1.8.0_161
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