text: create schema my_db;
  drop table if exists my_db.my_info;
  create table my_db.my_info (
      info_id        bigint(20)     not null auto_increment   comment 'ID',
      user_name      varchar(50)    default ''                comment '姓名',
      primary key (info_id)
  ) engine=innodb auto_increment=100 comment = '我的表';