主要实现不同数据库之间的转化，不同数据库与ＶＳ之间的连接。简单的ＡＤＯ编程，创建多线程，最终实现转库功能。-Mainly to achieve the conversion between different databases, different database and the connection between VS. Simple ADO programming, creating multi-threaded, and ultimately turn library functio