interface CustomDAO{
    List<User> findCustom();
}

@Repository
class Custom implements CustomDAO{
	@Override
	public List<User> findCustom() {
		// do something
		return null;
	}
	
}

@DAO
interface UserDAO extends CustomDAO{
    // 准备数据 (DDL)
    @SQL("create table user (id int, name varchar(200));")
    void createTable();
    @SQL("insert into user (id, name) values(:1.id, :1.name);")
    int[] insert(List<User> users);
}