一个适用于学习的Delphi商品销售查询程序，基于SQLServer数据库，为了测试方便，笔者已将数据库文件打包在Database目录中，测试前请附加。 -A suitable learning Delphi merchandise sales inquiry procedure, based on SQLServer database, in order to facilitate the testing, I have a database file is packaged in Datab