Manage
-MId:String-MPassword:String
AddUseer()DeleteUerse()AddCourse()DeleteCourse()
Score
-ScoreId:String-ScoreName:String-ScoreTeacher:StringScore:Integer
Score()
Student
-SId:String-SName:String-SPassword:String-SClass:String-Sex:String-Age:int
QueryScore()Information()AddCouese()
Course
CourseId:StringCourse_Name:StringCourse_TeacherString
Course()
n:1
1:n
n:n
Teacher
-TId:String-TPassword:String-TName:String-Sex:String
AddCourse()ReviseCourse()AddScore()RevisScore()
