return conn
def meta():
while True:
os.system("cls")
print("------------------------------------------------")
print("1: 售货员界面")
print("2: 进货员界面")
print("3: 管理员界面")
print(" 其他数字退出")
print("------------------------------------------------")
cmd = input("请输入选项:").strip()
if cmd=="1":
front_desk=FrontDesk()
front_desk.meta()
elif cmd=="2":
purchase_manage = PurchaseManage()
purchase_manage.meta()
elif cmd=="3":
admin_manage = AdminManage()
admin_manage.meta()
else:
break
os.system("pause")
if __name__ == '__main__':
try:
conn=link()
Basic.setConn(conn)
meta()
except Exception as e:
print("出现错误，原因：",e)
