某实例为了改进数据库操作的性能，自定义数据库连接对象Connection和语句对象Statement，可针对不同类型的数据库提供不同的连接对象和语句对象，如提供Oracle或MySQL专用连接类和语句类，而且用户可以通过配置文件等方式根据实际需要动态更换系统数据库。使用抽象工厂设计该系统。-An example in order to improve the performance of database operations, custom database connection object Connection and object Statement statement, can according to the different types of database connection object and statements of different objects, such as Oracle or MySQL dedicated connection and statement classes, and users can use the configuration file, according to the dynamic change of system database needs. Using abstract factory design the system.