LISP 简单的数据库 3.2 录入CD

使用全局变量 *db*，来保存数据

(defvar *db* nil)(defun make-cd (title artist rating ripped)  (list :title title :artits artist :rating rating :ripped ripped))(defun add-record (cd) ( push cd *db*))

数据录入

CL-USER> (add-record (make-cd "Roses" "Kathy" 7 t))((:TITLE "Roses" :ARTITS "Kathy" :RATING 7 :RIPPED T))CL-USER> (add-record (make-cd "Lily" "Pgy" 8 t))((:TITLE "Lily" :ARTITS "Pgy" :RATING 8 :RIPPED T) (:TITLE "Roses" :ARTITS "Kathy" :RATING 7 :RIPPED T))CL-USER> (add-record (make-cd "Kly" "Gy" 9 t))((:TITLE "Kly" :ARTITS "Gy" :RATING 9 :RIPPED T) (:TITLE "Lily" :ARTITS "Pgy" :RATING 8 :RIPPED T) (:TITLE "Roses" :ARTITS "Kathy" :RATING 7 :RIPPED T))#查看*DB*中的数据CL-USER> *DB*((:TITLE "Kly" :ARTITS "Gy" :RATING 9 :RIPPED T) (:TITLE "Lily" :ARTITS "Pgy" :RATING 8 :RIPPED T) (:TITLE "Roses" :ARTITS "Kathy" :RATING 7 :RIPPED T))