说明：  以实用为目的，结合具体的数据库应用，选择了7个最有代表性的实例，分别介绍ODBC API、MFC的ODBC类、DAO、OLE DB以及ADO的客户数据库访问技术和应用开发过程。
(Practical for the purpose, combined with a specific database application, select the seven most representative examples of, respectively, introduce ODBC API, MFC s ODBC category, DAO, OLE DB and ADO database access client technology and application development process.)