neo4j graphql

What is neo4j? 1. A high-performance graph relational model database 2. A nosql database 3. multiple types of support Programming Language 4. How can I delete nodes related to a node in neo4j, which is good at processing model data with multiple relationships? 1. Find all links of the target node 2. Start a transaction, delete the Start Node or end node3. traverse all the nodes found and delete the relevan

First, install the APOC 1. Download jar Package: https://github.com/neo4j-contrib/neo4j-apoc-procedures/releases 2. Place the jar package in the Plugins folder of the installation directory 3. Add the following in the neo4j.conf file: Dbms.security.procedures.unrestricted=apoc.* #增加页缓存到至少4G, recommended 20G: dbms.memory.pagecache.size=4g #JVM堆保存留内存从1G起, Max 4G: dbms.memory.heap.initial_size=1gdbms

Cypher provides a convenient way to express queries and other neo4j behaviors, cypher can not only complete the work, but also in the product has a fast enough speed. You can also work with query cases based on the Java language and use the Java API to customize the traversal method.The steps for querying the Cypher language are: parsing and validating queries, generating execution scenarios, locating the initial nodes, selecting and traversing relati

Node_1 = Graph_db.merge_one ("Test_node", "name", "hah") node_2 = Graph_db.merge_one ("test_node_2", "name", "Enen") rel = relationship (Node_1, "Has_test_rel", node_2) graph_db.create (rel) If the above code executes multiple times, there will be multiple relationships between node_1 and node_2. How to delete an extra relationship, leaving only one bar. Solution: MATCH (a)-[r:has_test_rel]-> (b) with A, B, TAIL (COLLECT (R)) as RR WHERE size (RR) >0 FOREACH (r in RR | DELETE R)

layer and application layer. Another is the 4-layer (or 5-layer) network model, which is the data link layer, the network layer, the transport layer and the application layer, and if you add the physical layer according to the 5-tier theory. The two layers here refer to the Data link layer. Many written interviews like to examine the fast line, so that you write a handwriting is not what. I learned this very early, and the process of fast sequencing is very clear. But the recent attempt to hand

shown in the following:4. Delete a specified relationship of two nodes1 syntax: MATCH (Node1:label1{property1:value1})-[relationship-name:relationship-label-name]-> (node2:label2{ property2:value2}) Delete R2 such as: Because Songqing book betrayed Wudang, Song and he severed the father-son relationship 3 MATCH (p1: Wudang {name: ' Song Far Bridge '})- [R: Father and Son]-> (p2: Wudang {name: ' songqing book '}) Delete RAfter the deletion of the Atlas as shown below, the two people no longer ha

;(movie), (Other) -[:acted_in]->(movie), (Robin:person {name:"Robin Williams" }) WHERE not (Robin)-[:acted_in]->(movie) RETURN DISTINCT Other; 5 Index CREATE INDEX: CREATE INDEX On:movie (title); CREATE INDEX on:P erson (name); In this case, a statement based on name or title in the query will be quick. (The purpose of the index is to speed up the query) For example, the following sentence speed will be increased: MATCH (Gene:person)-[:acted_in]->(M), (Other)-[:acted_in]->(m) WHE

Recently, on the basis of NEO4J Java API and RMI, a set of neo4j management tools is designed, which is divided into server side and client side, and communicates with RMI in middle. Basic functions include diagram database basic information Maintenance Management (creation, editing, deletion, statistics, etc.), graph database Data Maintenance management (create nodes and relationships, edit node and relati

There are two ways to use NEO4J: The embedding mode embedded and the server mode standalone, the bridge between the two is the neo4j-community-1.8.m03-windows\neo4j-community-1.8.m03\ The graph.db in data, which is replaced by the generated database folder in embedded mode, can be accessed from a generated database by 127.0.0.1:7474/webadmin in server mode.

Http://www.cnblogs.com/lpshou/p/3432028.html neo4j Installation and Example NEO4J has two access modes: Server mode and embedded mode reference, the following is a sample of configuration and access to both modes under Windows 1 Windows NEO4J Server mode installation with example Installation: 1. Download neo4j, I dow

NEO4J official website: https://neo4j.com/ Windows download Desktop installation package install registered account login First Use process: 1. Create a new database, select Local, enter the name test, and select the default database version. 2. Click the Start button, then open in the browser, enter the URL localhost:7474/ 3. Creating a Movie Database (Create, Find, Query, Solve) 1) Create Create (Thematrix:movie {title: ' The Matrix ', releas

Cypher Query Language simple to use3.1. Basic SyntaxNode syntax: The cypher uses a pair of parentheses to represent one of the nodes: Several formats are provided: () the anonymous node (matrix) adds an ID (: Movie) movie label label to the node, declaring the node type. The index of NOE4J uses label, each index consists of a label and a property (Matrix:movie) (Matrix:movie {title: "The Matrix"}) node attribute (for example: title) represents a Key\value list ( Matrix:movie {title: "The Matrix"

Tags: TAC install HTTPS code IDT import file Imports source using1. InstallationInstallation is very simple, exe files, so the next step is good. https://neo4j.com/download/2. local CSV file importThis problem is really my initial use of the biggest problem, I feel that my code is not written wrong, but has been wrong, eventually spent a day, finally found a positive solution, because this database does not know the default file system, you must set the data storage directory, manually add an im

according to certain rules, usually only a subset of the sub-graphs can be accessed. The NEO4J database provides a declarative cypher language to query the graph, and neo4j generates a traversal scheme to query the graph. You can also specify the traversal scheme directly, specifying depth first or breadth first.Indexes in NEO4J can be used to speed up queries,

should be excavated further to increase the knowledge coverage of Knowledge Atlas. Common Mining Techniques: Inference: Mining for entity attributes or relationships through a rule engine for discovering unknown implied relationships Entity importance ordering: When querying multiple keywords, search engines will select entities that are more relevant to the query to display. Common PageRank algorithms compute the importance of entities in the knowledge map. Second,

Tags: Technical system modification nbsp Usage src Basic Date returnAny database based on additions and deletions to the four functions, and neo4j use of the cypher language. Cypher is a very good language for working with graph databases, and here are some basic features to learn about his basic usage. Let's do a demonstration with our intelligent Motion Picture quiz System.Create a NodeThere are two ways to create a node, one is create, and the othe

NEO4J connection Java currently has embedded, JDBC, and rest APIs.Embedded: Using the Lib package in the neo4j download package lib (for Windows, not recommended to download the EXE version, because does not contain the code required LIB package)To create nodes and relationships:FinalString Db_path = "E:/neo4jdb";//Database PathGraphdatabaseservice graphdb =NewGraphdatabasefactory (). Newembeddeddatabase (D

neo4j download Download neo4j. Then access via http://localhost:7474 1, create the entity file CSV, you need to include a unique ID (in the way of UUID1) 2, create a relationship CSV, through the entity ID connected; Import: Entity 1: LOAD CSV with HEADERS from "File:///new_entity1.csv" Asline MERGE (Comp:company{name:line.name,code:line.code}) Entity 2: LOAD CSV with HEADERS from "File:///new_entity2.csv

Representative of the graph database: neo4j official website: http://neo4j.com/Introduction: Why use a graph databaseIn many new projects, the application of graph database is an imperative trend, because the graph database can be a good representation of the concept of various nodes and relationships, and can be very friendly visualization, greatly facilitates our data management and display work.The following is an introduction to the graphic relati

Label:NEO4J connection Java currently has embedded, JDBC, and rest APIs.JDBC: The Lib package to use: Neo4j-jdbc-2.0.1-snapshot-jar-with-dependencies.jarConnection con =DriverManager. getconnection ("jdbc:neo4j://localhost:7474/");//Create a connectionString Query= "Start N = node ({1}) return N.name"; PreparedStatement stmt=NULL;//with precompilation, unlike relational databases, parameters need to use {1},{2} instead of?ResultSet rs =NULL; Try{stmt=