text: 
  create table books(
      id int not null auto_increment primary key,
      isbn varchar(20) not null ,
      openid varchar(50) not null,
      title varchar(100) not null,
      image varchar(100),
      alt varchar(100) not null,
      publisher varchar(100) not null,
      summary varchar(1000) not null,
      price varchar(100),
      rate float,
      tags varchar(100),
      author varchar(100)
  )
  
  
  create table comments(
      id int not null auto_increment primary key,
      openid varchar(100) not null,
      bookid varchar(10) not null,
      comment varchar(200) not null,
      phone varchar(50),
      location varchar(50)
  )