Neo4j database

1. Introduction

　　

 

　　

　　Benefits: neo4j is a high-performance nosql graph database that stores structured data on the network instead of tables

　 

Second, installation and use

　　1. Download from the official website

　　2. Switch to the installation directory and run:

　　　　./neo4j  start

　　3. View the port

　　　　neo4j console

　　4. Enter localhost: 7474 in the browser, the initial user name and password are neo4j

　　5. After use, enter ./neo4j stop to close the database

 

　　Note: Version 4.0.3 supports jvm11      Unable to find any JVMs matching version "11".

　　

Three, basic commands

　　1. Create a label node

　　

 

　　2. Add attributes to the node

　　　　

 

　　3. Add attributes to existing nodes

　　　　

　　4. Inquiry

　　　　Query node's age attribute

　　　　

 

　　　　Query all attributes of a node

　　　　

 

　　5. Relationship

　　　　Create a relationship

　　　　

 

 　　　   

 

 　　　　

 

　　　　

 

 

 　　　　Delete the node under the corresponding attribute

　　　　

 

　　　　 Delete nodes with relationships

　　　　

 

 

　　　　 Delete attribute

　　　　 

 

 　　　　The difference between delete and remove: