Node.js MySQL module - throw err; // Rethrow non-MySQL errors;

Question

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");
  });
});

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:

Why can't I throw an error?

Well. You wanted to throw an error. You achieved it. What else do you need? — LEQADA
– LEQADA, Commented Aug 20, 2017 at 22:12
@LEQADA Why can't I catch it when I wrap con.connnect() to try-catch? — Null
– Null, Commented Aug 20, 2017 at 22:22
What you said to your application is to throw an error when there is any. And that is what your app is doing. — LEQADA
– LEQADA, Commented Aug 20, 2017 at 22:23
Try to replace your first if (err) throw err; with this line if (err) console.log("Oops... Something went wrong"); — LEQADA
– LEQADA, Commented Aug 20, 2017 at 22:32

EMX · Accepted Answer · 2017-08-20 23:33:46Z

5

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

MySQLJS Error handling

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

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

answered Aug 20, 2017 at 23:33

EMX

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Comments

Rizal Amrullah · Accepted Answer · 2020-01-30 19:11:48Z

1

change you're database conn like this

  var mysql      = require('mysql');
var connection = mysql.createConnection({
  host     : 'example.org',
  user     : 'bob',
  password : 'secret',
  database : 'secret'

});

connection.connect(function(err) {
  if (err) {
    console.error('error connecting: ' + err.stack);
    return;
  }

  console.log('connected as id ' + connection.threadId);
});

answered Jan 30, 2020 at 19:11

Rizal Amrullah

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