text: CREATE DATABASE email;
  
  use email;
  
  DROP TABLE t_mail;
  
  CREATE TABLE IF NOT EXISTS `t_mail`(
     `id` INT UNSIGNED AUTO_INCREMENT,
     `from` VARCHAR(100) NOT NULL,
     `to` VARCHAR(100) NOT NULL,
     `subject` VARCHAR(100) NOT NULL,
     `content` VARCHAR(100) NOT NULL,
     PRIMARY KEY ( `id` )
  )ENGINE=InnoDB DEFAULT CHARSET=utf8;
  
  insert into t_mail(`from`, `to`, `subject`, `content`) values("talentwill@163.com", "247840938@qq.com", 'Hello', "The first mail, welcome to Java world!");
  insert into t_mail(`from`, `to`, `subject`, `content`) values("talentwill@163.com", "247840938@qq.com", 'Hello', "The second mail, welcome to Java world!");