drop database if exists database_test;
create database if not exists database_test;
alter database database_test CHARACTER SET UTF8;
alter database database_test collate utf8mb4_general_ci;
alter database database_test CHARACTER SET UTF8 collate utf8mb4_general_ci;
drop database database_test;
create database database_test CHARACTER SET UTF8;
drop database database_test;
create database database_test collate utf8mb4_general_ci;
drop database database_test;
create database database_test CHARACTER SET UTF8 collate utf8mb4_general_ci;