if you attempted to drop a database in phpmyadmin it would put up a popup window asking you if you really wanted to delete the database. and if you did delete (aka drop) a database mysq does not make a backup of it, it just deletes it. so you cannot get it back if you deleted it. you may have set the permissions incorrectly
if you have this folder C:\wamp\mysql\data\voiot then the database has not been dropped.
to see how to set permissions correctly see my wamp manual.
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