Create a MySQL database and create a user with all grant on it

gistfile1.sql

CREATE USER 'DB_USERNAME'@'localhost' IDENTIFIED BY 'DB_PASSWORD';
GRANT USAGE ON * . * TO 'DB_USERNAME'@'localhost' IDENTIFIED BY 'DB_PASSWORD' WITH MAX_QUERIES_PER_HOUR 0 MAX_CONNECTIONS_PER_HOUR 0 MAX_UPDATES_PER_HOUR 0 MAX_USER_CONNECTIONS 0 ;
CREATE DATABASE IF NOT EXISTS `DB_USERNAME` ;
GRANT ALL PRIVILEGES ON `DB_USERNAME` . * TO 'DB_USERNAME'@'localhost';

#For connection from everywhere
GRANT USAGE ON * . * TO 'DB_USERNAME'@'%' IDENTIFIED BY 'DB_PASSWORD' WITH MAX_QUERIES_PER_HOUR 0 MAX_CONNECTIONS_PER_HOUR 0 
GRANT ALL PRIVILEGES ON `DB_USERNAME` . * TO 'DB_USERNAME'@'%';