parameters {
    string(name: 'DATABASE', defaultValue: 'jenkinsdatabase',
    description: 'The name of the database')
}

(...)

sh 'mysql --user ${USER} -p${PASSWORD} --host ${HOST} -e "DROP DATABASE IF EXISTS ${params.DATABASE};CREATE DATABASE ${params.DATABASE} DEFAULT CHARACTER SET utf8 DEFAULT COLLATE utf8_general_ci; commit;";export GRADLE_OPTS="-Xms1536m -Xmx1536m"'