本程序可实现刷卡后联系数据库，作为调用数据库的练习，基本了解其基本功能实现的流程。-This procedure enables the card to contact the database, call the database as a practice, a basic understanding of the process to achieve its basic functions.

本资料是刷卡后联系上位机数据库的练习源码，基本的工作流程，容易理解，全面把握-After this information is credit card link PC database practice source, basic workflow, easy to understand and master