ｓｑｌ访问的封装类，专用于CSHARP访问微软ｓｑｌｓｅｒｖｅｒ２０００数据库了。这是修改的访问完毕自动关闭数据库的版本-sql visit Packaging category, CSHARP dedicated to the visit of Microsoft sqlserver2000 database. This visit is amended to shut down automatically finished version of the database