用mysql语句写python学生管理系统
Python基于mysql实现学生管理系统本篇文章主要介绍了Python基于mysql实现学生管理系统，分享给大家，具体如下：
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import pymysqlimport re def idinput(string): ID = input(string) pattern = re.compile("^\d{1,3}$") while not re.match(pattern, ID): ID = input("请输入1-3位整数:") return ID def appendStudentInfo(): ID =idinput("请输入学生学号：") db=pymysql.connect(host="127.0.0.1",user="root",passwd="hisense",db="test",port=3306,charset="utf8") cursor=db.cursor() sql = "select * from StuSys where ID = '%s'" % ID cursor.execute(sql) while cursor.rowcount > 0 : ID = idinput("该学号已存在，请重新输入:") sql = "select * from StuSys where ID = '%d'" % int(ID) cursor.execute(sql) name=input("请输入学生姓名：") chinese=input("请输入语文成绩：") while not chinese.isdigit() or int(chinese)>100 or int(chinese)<0: chinese = input("输入错误，请重新输入：") math =input("请输入数学成绩：") while not math.isdigit() or int(math) > 100 or int(math) < 0: math = input("输入错误，请重新输入：") english=input("请输入英语成绩：") while not english.isdigit() or int(english) > 100 or int(english) < 0: english = input("输入错误，请重新输入：") total=int(chinese)+int(math)+int(english) sql="""INSERT INTO StuSys(ID, NAME,CHINESE,ENGLISH,MATH,TOTAL) VALUES (%s,%s,%s,%s,%s,%s)""" cursor.execute(sql,(ID,name,chinese,english,math,total)) db.commit() db.close() def delstudent(): delstudentid = idinput("请输入要删除的学生学号：") if querystudent(delstudentid): select = input("是否删除：是(Y)/否（N）") if select == "Y" or select == "y": db = pymysql.connect(host="127.0.0.1", user="root", passwd="hisense", db="test", port=3306, charset="utf8") cursor = db.cursor() sql = "delete from stusys where ID =%s" %delstudentid cursor.execute(sql) db.commit() db.close() print("删除成功") elif select == "N" or select == "n": print("取消删除") else: print("输入错误") def querystudent(querystudentid): db=pymysql.connect(host="127.0.0.1",user="root",passwd="hisense",db="test",port=3306,charset="utf8") cursor=db.cursor() sql="select * from stusys where ID=%s"%querystudentid cursor.execute(sql) if cursor.rowcount ==0 : print("不存在该学生信息") return False else: print("该学生信息如下：") results =cursor.fetchall() print("ID=%d,NAME=%s,CHINESE=%d,ENGLISH=%d,MATH=%d,TOTAL=%d" % \ (results[0][0], results[0][1], results[0][2], results[0][3], results[0][4],results[0][5])) return True def modifystudentifo(): modifyid = idinput("请输入要的学生学号：") if querystudent(modifyid): name = input("请重新输入学生姓名：") chinese = input("请重新输入语文成绩：") while not chinese.isdigit() or int(chinese) > 100 or int(chinese) < 0: chinese = input("输入错误，请重新输入：") math = input("请重新输入数学成绩：") while not math.isdigit() or int(math) > 100 or int(math) < 0: math = input("输入错误，请重新输入：") english = input("请重新输入英语成绩：") while not english.isdigit() or int(english) > 100 or int(english) < 0: english = input("输入错误，请重新输入：") total = int(chinese) + int(math) + int(english) db = pymysql.connect(host="127.0.0.1", user="root", passwd="hisense", db="test", port=3306, charset="utf8") cursor = db.cursor() sql1="update stusys set name ='%s' where id = %s"%(name,modifyid) cursor.execute(sql1) sql2="update stusys set math = %s where id = %s"%(math,modifyid) cursor.execute(sql2) sql3 = "update stusys set english = %s where id =%s"%(english,modifyid) cursor.execute(sql3) sql4 = "update stusys set total = %s where id = %s"%(total,modifyid) cursor.execute(sql4) sql5 = "update stusys set chinese = %s where id = %s"%(chinese,modifyid) cursor.execute(sql5) db.commit() db.close() def allinfo(): db=pymysql.connect(host="127.0.0.1",user="root",passwd="hisense",db="test",port=3306,charset="utf8") cursor=db.cursor() sql="select * from stusys" cursor.execute(sql) results= cursor.fetchall() for row in results: ID = row[0] NAME = row[1] CHINESE = row[2] ENGLISH = row[3] MATH = row[4] TOTAL = row[5] # 打印结果 print("ID=%d,NAME=%s,CHINESE=%d,ENGLISH=%d,MATH=%d,TOTAL=%d" % \ (ID, NAME, CHINESE, ENGLISH, MATH,TOTAL)) def studentMenu(): print("="*30) print("学生管理系统") print("1、添加学生信息") print("2、删除学生信息") print("3、查询学生信息") print("4、修改学生信息") print("5、全部学生信息") print("6、退出") print("="*30) if __name__ == '__main__': while True: studentMenu() menuindex = input("请输入选项序号：") while not menuindex.isdigit(): menuindex = input("输入错误，请重新输入：") if int(menuindex) ==1: appendStudentInfo() elif int(menuindex) ==2: delstudent() elif int(menuindex) ==3: querystudentid = idinput("请输入要查询的学生学号：") querystudent(querystudentid) elif int(menuindex) ==4: modifystudentifo() elif int(menuindex) == 5: allinfo() elif int(menuindex) == 6: break else: print("输入序号无效") |
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原文链接：https://blog.csdn.net/yaoliuwei1426/article/details/81101333