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Tag: Node

Remove leaf nodes with a single relationship in NEO4J

I am trying to delete leaf nodes in Neo4j, but only those nodes with a single incoming relationship. (I am very close.)

I have one The query returns the exact node I want to delete. However,

September 30, 2021By Simo Design Pattern delete, Hand, Leaf, Medium, NEO, Neo4J, Node, relationship, singleLeave a Comment

CVM single-node cluster configuration

The following commands are executed after logging in to CVM

1) Create a cluster

cluster -s cvm_ip create

2) View cluster status< /p> cluster status

3) Stop the cluster

September 30, 2021By Simo Load Balance cluster, configuration, CVM, Node, singleLeave a Comment

Cassandra Cluster Management – Delete Exception Nodes

Cassandra cluster management-delete abnormal nodes Fault simulation node: 172.20.101.166, the simulation node system is directly damaged, and all data is lost.

This document is only a part of

September 30, 2021By Simo Load Balance Cassandra, cluster, deletion, exception, management, NodeLeave a Comment

Visual Studio Code breakpoint debug NodeJS program Skip Node internal module (Internal Modules)

Built-in core modules of Node.js can be referred to by the’magic name’ in a glob pattern. The following example skips all internal modules:

“skipFiles”: [

“/**/*.js”,

]

September 28, 2021By Simo Visual Studio breakpoint, code, debugging, interior, Internal, module, modules, Node, Nodejs, program, skipping, Studio, VISUALLeave a Comment

Getting Started to Abandon the Node Series Express-Gateway Gateway

Foreword The first public account of this article [a typist]

There are really few articles on this topic on the online wall. A little bit of learning, I hope to help everyone. express-gateway

September 26, 2021By Simo Cgi abandoned, Express, Gateway, Getting started, Node, seriesLeave a Comment

What happens to the Node ID in the CAN bus?

In principle, two nodes are not allowed to have the same ID segment in a CAN-bus network, but what if the two nodes have the same ID segment?
  Before the experiment, we must first have a clear un

September 24, 2021By Simo Motherboard bus, How, ID, Medium, Node, the same, willLeave a Comment

How many data have each node in the NOSQL – Cassandra cluster?

When do the boundaries of SSTables compression (primary and secondary) become invalid?

If I have the main compression of 500G SSTables and my final SSTable will exceed 1TB-is this effective f

September 21, 2021By Simo Nosql Cassandra, cluster, data, each, how much, Medium, Node, NOSQLLeave a Comment

PostgreSQL – How to use node-postgres for bulk insertion

I am using express and node-pg to import excel files into the postgres database

Currently I loop through the excel rows and perform inserts for each row, but I I think this is not the right w

September 21, 2021By Simo Postgresql Batch, how to use, INSERT, Node, Postgres, PostgreSQLLeave a Comment

Project development — use node.js SASS syntax

Foreword: All sass files in this article refer to files with the suffix scss. It is also recommended to use files with the suffix name scss to avoid the strict format requirements of the sass suffi

August 22, 2021By Simo NodeJs Development, JS, Medium, Node, Node.js, project, Sass, Syntax, useLeave a Comment

Use routing methods in node.js

1. The find method of the array still doesn’t work, so change to filter

2. The regular expression is still not well understood

//var myrouter = require(“./myrouter”) ;
//myrouter.getRo

August 22, 2021By Simo NodeJs JS, Medium, method, Node, Node.js, Route, useLeave a Comment

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