database

type Book struct {
	// all field tags must be exported through capitalization
	// if they are to be used in the JSON encodings
	ID int `json:"id,omitempty"`
	// `omitempty` excludes the field from the JSON encoding if its empty
	ISBN   int    `json:"isbn,omitempty"`
	Title  string `json:"title"`
	Author string `json:"author"`
	Genres string `json:"genres"`
	Year   int    `json:"year,omitempty"`
}

type BookShelf struct {
	DB *sql.DB
}

type BookStore interface {
	GetBook(int) (*Book, error)
	GetBooks() ([]Book, error)
	AddBook(*json.Decoder) (*Book, error)
	UpdateBook(*json.Decoder, int) (*Book, error)
	DeleteBook(int) (sql.Result, error)
}