Node.js MySQL模块-抛出err;//抛出非MySQL错误； [英] Node.js MySQL module - throw err; // Rethrow non-MySQL errors;

问题描述

今天我尝试了来自w3schools的node.js mysql代码段:

today I tried node.js mysql snippet from w3schools:

var mysql = require('mysql');

var con = mysql.createConnection({
  host: "localhost",
  user: "roots", // WRONG USER
  password: ""
});

con.connect(function(err) {
  if (err) throw err;
  console.log("Connected!");
  /*Create a database named "mydb":*/
  con.query("CREATE DATABASE mydb", function (err, result) {
    if (err) throw err;
    console.log("Database created");
  });
});

我想学习如何处理mysql错误，因为我的应用需要mysql.但是在我启动app.js文件后，出现了以下错误:

I wanted to learn how to handle mysql errors, because my app require mysql. But after I started app.js file this error showed up:

为什么我不能抛出错误?

Why can't I throw an error?

推荐答案

我想学习如何处理mysql错误，因为我的应用要求 mysql.

I wanted to learn how to handle mysql errors, because my app require mysql.

MySQLJS错误处理

要捕获您throw的错误，请尝试使用以下代码段:

To catch the errors you throw, try with the following snippet :

con.on('error', function(err) {
  console.log("[mysql error]",err);
});

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