课程信息管理：能够增加数据，删除数据，显示数据，修改数据，按姓名和首字母查询数

courseNumber：课程号

coursename：课程名

subject：所属专业

xingzhi：性质

time：学时

score：学分

-Course information management: the ability to add data, delete data, display data, modify data, according to the first letter of the name and number of queries courseNumber: Course No. coursename: Course Name subject: their professional xingzhi: the nature of time: hours score: Credits