该程序是某汽车4s店入口欢迎看板的主程序，实现实时访问数据库，配合路口抓拍摄像机，当车辆进入时立即显示对应欢迎信息至看板。-The program is a automobile 4S shop entrance welcome board of the main program, real-time access to the database, with the intersection of snapshot camera, when a vehicle enters immediatel