Use platformName to determine db type

[stockalexander]

Use platformName instead of default connection name to determine used dbms. Previous solution isn't working, when custom names are used.

This should fix the problem mentioned in #480 for custom connection names, too. Example config/database.php section:

'default' => env('DB_CONNECTION', 'main_db'),
'connections' => [
    'main_db' => [
        'driver' => 'mysql',
        'host' => env('DB_HOST_MAIN', '127.0.0.1'),
        'port' => env('DB_PORT_MAIN', '3306'),
        'database' => env('DB_DATABASE_MAIN', ''),

...

[mfn]

Perfectly makes sense to me!

Pure luck it worked in most cases. I also checked that the platform names returned from DBAL match the existing case statements and added a changelog entry.

Thank you!