neo4j

Neo4j cypher to count and display all the relationship between two given nodes

阅读更多关于 Neo4j cypher to count and display all the relationship between two given nodes

问题 Here I am using neo4j rest api, in first step I want to collect information like how many relationships are there between two given nodes. Sample : MATCH (n:Node {id: {parameter1}})-[r:someType]-(m:Node {id: {parameter2}}) RETURN COUNT(r) Then I would like to collect all the values assigned to the edges so I can calculate further calculations. I need all the different types of relationships and their properties between two given nodes. If it is possible I would like to do it in single cypher.

Neo4j 数据批量导入

阅读更多关于 Neo4j 数据批量导入

目前主要有以下几种数据插入方式： Cypher CREATE 语句，为每一条数据写一个CREATE Cypher load csv语句，将数据转成CSV格式，通过LOAD CSV读取数据。官方提供的Java API —— Batch Inserter 大牛编写的 BatchImport 工具官方提供的 neo4j-import 工具这边重点来说一下官方最快的 neo4j-import ，使用的前提条件： graph.db需要清空； neo4j需要停掉；接受CSV导入，而且格式较为固定；试用场景:首次导入节点名字需要唯一比较适用于：首次导入、无法迭代更新简单的Demo （数据导入之前需要停止neo4j服务） movies.csv. movieId:ID,title,year:int,:LABEL tt0133093,"The Matrix",1999,Movie tt0234215,"The Matrix Reloaded",2003,Movie;Sequel tt0242653,"The Matrix Revolutions",2003,Movie;Sequel 其中，title是属性，注意此时需要有双引号；year:int也是属性，只不过该属性是数值型的； :LABEL 与：ID 一样生成了一个新节点，也就是一套数据可以通过 : 生成双节点 actors.csv

Neo4j自用手册

阅读更多关于 Neo4j自用手册

一、Neo4j基本操作 1. 增删改查 1.1 创建节点与关系 01-创建节点 CREATE(m:进制) //m为变量名，写什么都可以，“进制”为标签 02- 创建带有属性的节点 CREATE (m:进制 { 中文名:"进制",外文名称:"system of numeration",实质:"是人们规定的一种进位方法" }) match(m：进制) return(n) //match为查询匹配的功能，有match,一定要有return 03-判断是否节点已存在，若存在不操作，不存在再创建 MERGE (n {name: '3'}) //Create if a node with name='3' does not exist else match it MERGE (test2 {name:'2'}) //Create if a node with name='2' does not exist else match it 04-创建节点之间的关系 //直接创建新的节点关系,以下将创建两个节点，一个带属性的关系（边） CREATE (m:进制 {name:"byte"})-[r:应用{年代:1990,人物:"冯诺依曼"}]->(n:内存 {name:"memory"}) //已有的两个节点创建关系 MATCH (m:进制 {name:"byte"}),(n:内存 {name:

Starting Neo4j failed: Address localhost:7474 is already in use, cannot bind to it on Mac OSX

阅读更多关于 Starting Neo4j failed: Address localhost:7474 is already in use, cannot bind to it on Mac OSX

问题 I'm trying to install a neo4j server on my localhost (mac osx - El-capitan) and i'm getting this error - Starting Neo4j failed: Address localhost:7474 is already in use, cannot bind to it. I tried to stop the port from running and then install it throw the neo4j install app, but it still give this error When i try to start the neo4j server it gives me this error : ./usr/local/bin/neo4j: line 229: [: too many arguments 回答1: Try to kill your java processes : sudo killall -9 java Then restart

Neo4j: Match multiple labels (2 or more)

阅读更多关于 Neo4j: Match multiple labels (2 or more)

问题 I would like to do a search, and I would like to start traversing from 2 labels (OR condition). For example, I need to find out all the nodes which have labels either 'Male' or 'Female' and whose property, name =~ '. ail. '. 回答1: You can put this condition in the WHERE clause: MATCH (n) WHERE n:Male OR n:Female RETURN n EDIT As @tbaum points out this performs an AllNodesScan . I wrote the answer when labels were fairly new and expected the query planner to eventually implement it with a

Neo4j非关系型数据库的使用

阅读更多关于 Neo4j非关系型数据库的使用

一、安装 1.下载地址 https://neo4j.com/download/ 根据系统进行选择二、安装下载完成后进行解压，并配置环境变量： 1.创建系统变量：NEO4J_HOME 变量值为Neo4j的安装路径，例如：F:\Neo4j\neo4j-community-3.5.14-windows\neo4j-community-3.5.14 2.在path里添加%NEO4J_HOME%\bin 三、启动和停止服务以下命令需要控制台进入到Neo4j对应的安装目录中的bin目录下。在安装好之后服务是默认开启的可以通过neo4j.bat console 来进行验证是否安装成功，若出现以下内容，则代表安装成功，并且已经启动服务： 2020-01-03 09:00:02.353+0000 INFO ======== Neo4j 3.5.14 ======== 2020-01-03 09:00:02.367+0000 INFO Starting... 2020-01-03 09:00:05.209+0000 INFO Bolt enabled on 127.0.0.1:7687. 2020-01-03 09:00:06.628+0000 INFO Started. 2020-01-03 09:00:07.474+0000 INFO Remote interface available

neo4j下载安装

阅读更多关于 neo4j下载安装

安装java环境： https://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html 下载社区版的neo4j： http://neo4j.com.cn/topic/5b003eae9662eee704f31cee window版本：无需安装，直接解压就好然后进入它的bin目录，在终端敲：./neo4j console，点击终端弹出的最后的网址就可进入了（它的初始账户和密码都是neo4j） linux系统：将安装包上传到指定的目录下，解压 tar -axvf neo4j-community-3.4.5-unix.tar.gz 进入解压包的conf目录下，修改配置文件neo4j.conf信息主要修改54行，开启远程ip访问功能，其他参数信息可不修改 # 修改第22行load csv时l路径，在前面加个#，可从任意路径读取文件 #dbms.directories.import=import # 修改35行和36行，设置JVM初始堆内存和JVM最大堆内存 # 生产环境给的JVM最大堆内存越大越好，但是要小于机器的物理内存 dbms.memory.heap.initial_size=5g dbms.memory.heap.max_size=10g # 修改46行，可以认为这个是缓存

阅读更多关于 neo4j

Neo4j是世界领先的图形数据库。它的体系结构旨在优化管理，存储和遍历节点和关系。该数据库采用一种属性图方法，这对于遍历性能和操作运行时都是有益的。Neo4j提供专用的内存管理以及高效的内存操作。选择图数据库的场景及原因：＊社交网络；＊推荐和个性化；＊客户360，包括实体解析（关联多个来源的用户数据）；＊欺诈识别；＊资产管理；＊物流＊金融风控行业＊实时推荐图数据库善于处理大量的、复杂的、互联的、多变的网状数据，其效率远远高于传统的关系型数据库，擅长处理关系，速度也比传统sql更快 ubuntu18.04以 apt-get 方式安装官方安装指南 wget -O - https://debian.neo4j.com/neotechnology.gpg.key | sudo apt-key add - echo 'deb https://debian.neo4j.com stable latest' | sudo tee -a /etc/apt/sources.list.d/neo4j.list sudo apt-get update sudo apt-get install neo4j PDF手册指南启动与停止neo4j服务开始使用neo4j sudo neo4j start sudo neo4j stop 如图，有一个WARNING提示。

What is the fastest way to import to Neo4j?

阅读更多关于 What is the fastest way to import to Neo4j?

问题 I have a list of JSON documents, in the format: [{a:1, b:[2,5,6]}, {a:2, b:[1,3,5]}, ...] What I need to do is make nodes with parameter a , and connect them to all the nodes in the list b that have that value for a . So the first node will connect to nodes 2, 5 and 6. Right now I'm using Python's neo4jrestclient to populate but it's taking a long time. Is there a faster way to populate? Currently this is my script: break_list = [] for each in ans[1:]: ref = each[0] q = """MATCH n WHERE n.url

What is the fastest way to import to Neo4j?

阅读更多关于 What is the fastest way to import to Neo4j?

订阅 neo4j