数据模型定义

CPN颜色集定义

实体名

属性名

Student

Student_Name

closetStudent_Name=string;

var n:Student_Name;

closetStudent_id=int; var p:Student_id; closetStudent_information =product Student-Name*Student-id;

Student_id

Student_grade

closetGrade=int; closetStudent_grade = product Studen_Name*Grade; var g: student_grade;

Class

Class_num

closetClass_num=int; var c:Class_num;

System

Class_information

closetClass_information=int; var i:Class_information;