neo4j | 易学教程

数据库 (图 Neo4j 使用教程)

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图数据库功能：主要是处理具有深度相关联的数据，尤其是几何性增长的这种关系，比关系型数据库更具有优势。　　　　一个图是由节点和关系构成，节点和关系都可以包含属性。　　一个关系连接两个节点，必须有一个开始节点和结束节点。　　Neo4j 的安装　　下载地址：桌面版（学习使用） https://neo4j.com/artifact.php?name=neo4j-desktop-offline-1.2.1-setup.exe 　　windows 下安装社区版 zip 　　1.解压文件　　2. cmd 进入bin 下面，执行 neo4j install-service 　　3. neo4j start 启动服务　　4. http://localhost:7474 　　5. neo4j stop 停止服务　　6. neo4j uninstall-service 卸载　 7. 默认用户名称和密码 neo4j neo4j 　　Neo4j 的使用　命令格式示例新增节点名称:标签名称{key:value} 需要注意的是 key 不能使用双引号包裹 CREATE ( <node-name>:<label-name> { <key>:<Value> ........ <n-key>:<n-Value> } ) create(user:Use {name:"小明"

Neo4j (3.4.17, 3.5.13, 4.0.0) in docker on plesk doesn't use provided SSL certificates in /ssl but tries to delete them and make its own self-signed

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问题 This configuration has worked for me at some point but simply stopped after a brief VPS suspension due to no automatic renewal being enabled. As per documentation, I'm providing a neo4j.cert and neo4j.key in a folder that I then mount on the container for /ssl. Unfortunately, neo4j will be stuck on 'cleaning up self-generated ...' and throw out 'permission denied' unless I set 775 permissions on that folder so it can write & execute as well (group policy). If I do set to 775 things work but

neo4j : CALL APOC.LOAD.HTML with HEADERs

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问题 I have the following table <table> <tr> <th> header 1</th> <th> header 2</th> <th> header 3</th> <tr> <td> keyword1 </td> <td> value1.2 </td> <td> paragraph 1 </td> </tr> <tr> <td> keyword2 </td> <td> value2.2 </td> <td> paragraph 2 paragraph 3 </td> </tr> <tr> <td> keyword3 </td> <td> value3.2</td> <td> paragraph 1 paragraph 3 </td> </tr> </table> What method you suggest to use to load it via apoc.load.html and apoc.node.create or apoc

neo4j : CALL APOC.LOAD.HTML with HEADERs

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Neo4j初次使用

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1、编写Cypher命令创建节点和节点关系；（1）节点创建介绍 CREATE(n:Movie) 创建带有一个标签Movie的节点； CREATE(n:Movie:Person)创建带有多个标签Movie,Person的节点； CREATE(n),(m)创建多个节点，该句无返回结果； CREATE(n:TEST{name:'a',age:12})创建带有标签TEST和属性{}的节点。（2）在$命令行中编写Cypher脚本代码，点击执行按钮，创建第一个节点； CREATE (n:People { name: 'Andres', title: 'Developer' }) return n; （3）创建一个节点后，在Graph模式下可以看到创建的图形。继续编写Cypher脚本，创建其他节点； CREATE (n:Person { name: 'Vic', title: 'Developer' }) return n; 创建后点击*(2)显示两个节点；（4）已经有两个节点了，现在开始创建两个节点之间的关系 CREATE (n:People { name: 'Andres', title: 'Developer' }) return n; CREATE (n:Person { name: 'Vic', title: 'Developer' }) return n; MATCH(n1

How can I get the number of nodes of a Neo4j graph database from Python?

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问题 I'm trying to get the number of nodes of a Neo4j graph database using Python, but I don't find any method or property to do that. Does anybody how can I get this information? Other Python packages like NetworkX has a method to get this information. >>> G = nx.Graph() # or DiGraph, MultiGraph, MultiDiGraph, etc >>> G.add_path([0,1,2]) >>> len(G) 3 回答1: Update: Since I first wrote this, the answer has changed. The database now keeps exact counts of total nodes, as well as counts by label.

Neo4j Cypher — limit for “in” clause in query

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问题 I am working on a cypher query fetching nodes which are present in the path and so we are providing start node and list of nodes which are expected in the path and expected result is the nodes from the provided list. Can you please suggest what is the limit of in clause in Neo4j like we have limit of 2100 in sql. Example query : MATCH (n:person{key:2529962, ownBy:0}) MATCH path = n<-[:relation]-(c:Equipment) WHERE c.key in [1505697,2406945,2408297,2408531,2410815,2413566,2415224,] RETURN

Neo4j Desktop Error on Open - “cannot read property ”name" of undefined

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问题 I have a box running Windows Server 2016 box. I found an answer to this question regarding a MAC here: #neo4j Initialization error: TypeError: Cannot read property 'name' of undefined This answer does not seem to work in windows as removal of 'AppData\Roaming\Neo4j Desktop' caused the application not to open; however, a background process was started. The AppData\Roaming\Neo4j Desktop\log.txt file shows this error: App initialization error: Error: ENOENT: no such file or directory, scandir 'C

Deleting indexed nodes in Neo4j

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问题 In Neo4j, if I delete an indexed node do I have to remove that node from the index first or will the index be updated automatically? Here is a small (untested) example: val index = graphDb.index() val someIdx = index.forNodes("someIdx") val someNode = graphDb.createNode() someIdx.add(someNode, "key", "value") And then: //remove from someIdx??? someNode.delete() 回答1: When you delete a node, you have to remove the index first. If you want to remove all mentions of a node from the index, see

Audits with Spring Data Neo4j

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问题 I'm currently working on a project that makes use of Spring Data Neo4j. Whenever a NodeEntity is created, I would like to create a referenced Audit NodeEntity that contains the creation date and user. A solution that I've come up with, is to write an AOP Aspect which hooks in on the create method of my service layer. This works fine for entities that aren't cascaded, but what about the cascaded ones? That are not explicitly passed in my service layer so my AOP class will not intercept them.