python实现学生管理系统（mysql+面向对象）

python实现学生管理系统（mysql+面向对象）

from pymysql import *

class Mysql():

def __init__(self):
self.conn=connect(user="root", password="malong1", port=3306, host="localhost", database="jian", charset="utf8")
self.cur=self.conn.cursor()

def __del__(self):
self.cur.close()
self.conn.close()

def set_sql(self,sql="",prm=()):

self.cur.execute(sql,prm)
if "select" in sql:
result=self.cur.fetchall()
else:
self.conn.commit()
result=()
return  result

class Students(Mysql):

# 定义两个类属性
# conn=connect(user="root", password="malong1", port=3306, host="localhost", database="jian", charset="utf8")
# cur=conn.cursor()

@staticmethod
def menu():
print("*" * 40)
print("1.查看所有学生信息")
print("2.插入数据")
print("3.删除学生")
print("4.查看班级对应哪些学生")
print("5.退出")
print("*" * 40)
a = int(input("请输入操作的序号"))
return a

def add_student(self):
add_name = input("请输入学生姓名")
add_age = input("请输入学生年龄")
add_height = input("请输入学生身高")
add_gender = input("请输入学生性别")
add_cls_name = input("请输入学生所在班级")

sql = """
insert into students(name ,age,height,gender,cls_name) values(%s,%s,%s,%s,%s)
"""
# prm=(add_name,add_age,add_height,add_gender,add_cls_name)

try:
# self.cur.execute(sql,prm)
# self.conn.commit()

self.set_sql(sql=sql,prm=(add_name,add_age,add_height,add_gender,add_cls_name))
except Exception as e:
print(e)
self.conn.roolback()

# 查询所有信息
def show_student(self):

sql="""select * from students"""

try:
# self.cur.execute(sql)
# mll=self.cur.fetchall()
set1=self.set_sql(sql=sql)

print("序号  姓名  年龄  身高  性别  班级")
for i in set1:
print(i[0],i[1],i[2],i[3],i[4],i[5])
except Exception as e:
print(e)
self.conn.rollback()

def del_student(self):
id=int(input("请输入你要删除的编号"))
sql="""delete from students where id=%s"""

try:
# self.cur.execute(sql,id)
# self.conn.commit()

self.set_sql(sql=sql,prm=id)

except Exception as e:
print(e)
self.conn.rollback()

def inquire_student(self):
cls_name = input("请输入你要查寻的班级")
sql = """select name from students where cls_name=%s"""

try:
# self.cur.execute(sql,cls_name)
# mm=self.cur.fetchall()

nn=self.set_sql(sql=sql,prm=cls_name)
if nn:
print(nn)
except Exception as e:
print(e)
self.conn.rollback()

class Main():
while True:
s = Students()
b=s.menu()
if b==2:
s.add_student()
if b==1:
s.show_student()
if b==3:
s.del_student()
if b==4:
s.inquire_student()
elif b==0:
# s.cur.close()
# s.conn.close()
break

if __name__ == '__main__':
Main()