用VC++链接SQLServer数据库，包括链接，查询，插入，更新，删除等函数，已经将相关函数封装在类里面，可以直接重用或者扩充。-With VC++ Link SQLServer database, including the link, query, insert, update, delete, etc. functions, has been encapsulated in the type of correlation function which can be directly re