node连接mysql，使用navicat可视化

安装mysql

1. 电脑本地安装mysql及启动
   mysql下载地址：https://dev.mysql.com/downloads/file/?id=501136
   安装参考教程1：https://www.cnblogs.com/winton-nfs/p/11524007.html
   安装参考教程2：https://blog.csdn.net/weixin_42869365/article/details/83472466
2. node安装mysql依赖
   项目目录下执行：npm i mysql

安装navicat

navicat15+注册机+破解教程：https://www.cnblogs.com/xuexianqi/p/12797170.html
navicat连接mysql：https://www.easck.com/cos/2020/1201/593256.shtml
navicat或node连接mysql时可能连接失败，以下图示报错表示未启动MySQL，需手动启动本地MySQL服务，然后重新连接

报错：client does not support authentication protocol requested by server
参考解决方案：https://www.cnblogs.com/Liqian-Front-End-Engineer/p/11571646.html

node连接mysql

创建js文件

const mysql = require('mysql')

const connection = mysql.createConnection({
    host: 'localhost',
    user: 'root',
    password: '123456',
    database: 'test'
})

connection.connect()

// 查
// const sql = 'SELECT * FROM user'

// 增
// const sql = `INSERT INTO user(name, age) VALUES ('cindy', 18)`

// 改
// const sql = `UPDATE user SET name = 'becky', age = '20' WHERE name = 'cindy'`

// 删
// const sql = `DELETE FROM user WHERE name = 'becky'`

const sql = 'SELECT 1 + 1 AS solution'

connection.query(sql , function (error, results, fields) {
    if (error) throw error
    console.log('The solution is: ', results[0].solution)
})

使用node运行js文件
运行结果

{
  createConnection: [Function: createConnection],
  createPool: [Function: createPool],
  createPoolCluster: [Function: createPoolCluster],
  createQuery: [Function: createQuery],
  escape: [Function: escape],
  escapeId: [Function: escapeId],
  format: [Function: format],
  raw: [Function: raw]
}
The solution is:  2