//简单数据操作
单一记录
> (defun make-cd (title artist rating ripped)
(list :title title :artist artist :rating rating :ripped ripped))
make-cd
> (make-cd "Roses" "Kathy Mattea" 7 t)
(:TITLE "Roses" :ARTIST "Kathy Mattea" :RATING 7 :RIPPED T)
定义全局变量（数据库）
> (defvar *db* nil)
添加记录函数
> (defun add-record (cd) (push cd *db*))
调用
CL-USER> (add-record (make-cd "Roses" "Kathy Mattea" 7 t))
((:TITLE "Roses" :ARTIST "Kathy Mattea" :RATING 7 :RIPPED T))
CL-USER> (add-record (make-cd "Fly" "Kathy Mattea" 8 t))
((:TITLE "Fly" :ARTIST "Kathy Mattea" :RATING 8 :RIPPED T)
(:TITLE "Roses" :ARTIST "Kathy Mattea" :RATING 7 :RIPPED T))
CL-USER> (add-record (make-cd "Home" "Kathy Mattea" 9 t))
((:TITLE "Home" :ARTIST "Kathy Mattea" :RATING 9 :RIPPED T)
(:TITLE "Fly" :ARTIST "Kathy Mattea" :RATING 8 :RIPPED T)
(:TITLE "Roses" :ARTIST "Kathy Mattea" :RATING 7 :RIPPED T))
查看数据库内容
> *db*
格式化显示
> (defun dump-db ()
(dolist (cd *db*)
(format t "~{~a: ~10t~a~%~}~%" cd)))
> (dump-db)
TITLE: Home
ARTIST: Kathy Mattea
RATING: 9
RIPPED: T
TITLE: Fly
//format destination control-string args
destination 目标 t为标准输出流
control-string 格式字符串
~a 美化指令，去掉双引号、前导冒号。
~t 制表，~10t产生10个空格。
~% 换行
//读取输入
(defun prompt-read (prompt)
(format *query-io* "~a: " prompt)
(force-output *query-io*)
(read-line *query-io*))
//转换整数
输入其他字符报错
(parse-integer (prompt-read "Rating"))
允许输入其他字符
(parse-integer (prompt-read "Rating") :junk-allowed t)
找不到整数默认为0
(or (parse-integer (prompt-read "Rating") :junk-allowed t) 0)
//限制输入y/n
(y-or-n-p "Ripped [y/n]")
//输入一条CD
(defun prompt-for-cd()
(make-cd
(prompt-read "Title")
(prompt-read "Artist")
(or (parse-integer (prompt-read "Rating") :junk-allowed t) 0)
(y-or-n-p "Ripped [y/n]")))
)
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)
