Unknown database issue after re-installing wamp server

After having trouble with wamp server, i've uninstalled it and made a mistake by moving the www folder and download wamp all over again.

So after installing wamp and fixing the problem i had, my project (using laravel) doesn't work anymore:

SQLSTATE[HY000] [1049] Unknown database 'db_name'

I tried php artisan cache:clear but nothing changed

How can I fix this?

via Chebli Mohamed