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跟进：ECONNREFUSED 127.0.0.1:3306 错误将 MySQL 数据库连接到 NodeJS express 服务器（带打字稿），我通过将问题缩小到“通​​过终端运行应用程序而不是 coderunner 扩展（其中有效，但仅适用于单个文件，而不是构成目录并一起运行的分散文件）。”

这是我通过终端运行时遇到的问题，即 node/nodemon

Error: connect ECONNREFUSED 127.0.0.1:3306
    at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1146:16)
    --------------------
    at Protocol._enqueue (/mnt/c/Users/abdul/Desktop/nodemysql/node_modules/mysql/lib/protocol/Protocol.js:144:48)
    at Protocol.handshake (/mnt/c/Users/abdul/Desktop/nodemysql/node_modules/mysql/lib/protocol/Protocol.js:51:23)
    at Connection.connect (/mnt/c/Users/abdul/Desktop/nodemysql/node_modules/mysql/lib/Connection.js:116:18)
    at Object.<anonymous> (/mnt/c/Users/abdul/Desktop/nodemysql/app.js:13:4)
    at Module._compile (internal/modules/cjs/loader.js:1063:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1092:10)
    at Module.load (internal/modules/cjs/loader.js:928:32)
    at Function.Module._load (internal/modules/cjs/loader.js:769:14)
    at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:72:12)
    at internal/main/run_main_module.js:17:47 {
  errno: -111,
  code: 'ECONNREFUSED',
  syscall: 'connect',
  address: '127.0.0.1',
  port: 3306,
  fatal: true
}

下面是我用来连接到 MySQL 数据库的新代码（请记住，由于某种原因它可以与 coderunner 扩展一起使用，而不是 node / nodemon）

const express = require("express");
const mysql = require("mysql");

// Create connection

const db = mysql.createConnection({
  host: "localhost",
  user: "root",
  port: 3306,
  password: "password",
});

db.connect((err) => {
  if (err) {
    throw err;
  }
  console.log(" ... CONNECTED ... ");
});

const app = express();

app.get("/createdb", (req, res) => {
  let sql = "CREATE DATABASE nodemysql";
  db.query(sql, (err, result) => {
    if (err) throw err;
    console.log(result);
    res.send({
      message: "this is the result: " + result,
    });

    db.end();
  });
});

app.listen("3000", () => {
  console.log("Server started on port 3000");
});

有任何想法吗？

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