说明：  获取本机ip，mac地址和时间，依次转换成16进制字符串，并连接到一起，返回的字符串可以作为数据库编程创建数据表的主键ID.
(Access to the local ip, mac address and time, followed by 16 to convert hexadecimal string, and connect together, the return of the string can be used as a database programmer to create data table primary key ID.)