ADD file via upload

student.py

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+import pymysql
+
+conn = pymysql.connect(host='localhost'
+                       , user='root'
+                       , password='20030201'
+                       , database='student'
+                       , charset='utf8')
+
+cur = conn.cursor()
+#  添加学生信息
+def addstu(name,sex,num):
+    i = cur.execute("select num from stu where num=%s", num)
+    if i==0:
+        sql = "insert into stu values(%s,%s,%s)"
+        cur.execute(sql, (name, sex, num))
+        conn.commit()
+        print("添加成功")
+    else:
+        print("该号码存在，添加失败")
+
+# 删除学生信息
+def deletestu(num):
+    sql = "delete from stu where num=%s"
+    f = cur.execute(sql,(num))
+    conn.commit()
+    if f==0:
+        print("该号码不存在，删除失败")
+    else:
+        print("删除成功")
+# 修改学生信息
+def changestu(name,sex,num):
+    sql = "update stu set name=%s,sex=%s where num=%s"
+    f = cur.execute(sql,(name,sex,num))
+    conn.commit()
+    if f==0:
+        print("修改失败，该电话号码不存在")
+    else:
+        cur.execute("select * from stu where num=%s",num)
+        conn.commit()
+        print("修改成功,修改后信息为"+str(cur.fetchone()))
+# 查询学生信息
+def selectstu(num):
+    sql = "select * from stu where num=%s"
+    i = cur.execute(sql,num)
+    conn.commit()
+    if i==0:
+        print("该号码不存在")
+    else:
+        data = cur.fetchone()
+        print(data)
+        # 海象运算符3.8以后才能用
+        # 赋值表达式的值可以直接作为while循环的条件
+        # while data := cursor.fetchone()
+        # print(data)
+        print("查询成功")
+# 查询所有学生信息
+def selectAllStu():
+    cur.execute("select * from stu")
+    data = cur.fetchone()
+    while data:
+        print(data)
+        data = cur.fetchone()
+while(True):
+    print("----------学生管理系统----------")
+    print("请选择如下功能:")
+    print("1.添加学生")
+    print("2.删除学生")
+    print("3.修改学生信息")
+    print("4.查询学生信息")
+    print("5.显示所有学生信息")
+    print("6.保存学生信息")
+    print("7.退出系统")
+    chose = input("请输入你需要的功能序号:")
+    if chose == "1":
+        name = input("请输入学生姓名:")
+        sex = input("请输入学生性别:")
+        num = input("请输入学生电话:")
+        addstu(name,sex,num)
+    elif chose == "2":
+        num = input("请输入要删除学生的电话:")
+        deletestu(num)
+    elif chose == "3":
+        num = input("请输入要修改学生的电话:")
+        name = input("请输入学生姓名:")
+        sex = input("请输入学生性别:")
+        changestu(name,sex,num)
+    elif chose == "4":
+        num = input("请输入要查询学生电话:")
+        selectstu(num)
+    elif chose =="5":
+        selectAllStu()
+    elif chose == "6":
+        print("学生信息保存成功")
+    elif chose == "7":
+        break