the connection string is parsed wrongly

[its-dibo]

the method createConnection accepts a connection URL as a string or an object of type ConnectionConfig
if a string is passed, it uses require('url').parse to parse the string and returns a connection object.

this approach assumes that the property pathname that is returned by url.parse has a string value, but in fact, it returns null when providing a port which is an integer

example
let's parse this connection URL string mysql://username:password@host:1234

const urlParse = require('url').parse;

let url = "mysql://username:password@host:123",
 parsed = urlParse(url, true);

console.log(parsed)

output:

 {
  protocol: 'mysql:',
  slashes: true,
  auth: 'username:password',
  host: 'host:123',
  port: '123',
  hostname: 'host',
  hash: null,
  search: null,
  query: [Object: null prototype] {},
  pathname: null, // <----------------------------------
  path: null,
  href: 'mysql://username:password@host:123'
}

note that pathname here is null

[dougwilson]

Good catch. We can fix the module to properly handle null, as it should be the same as just no database like otherwise. Sorry for that bug, it is an easy fix.