数据库操作，实现数据库操作基本功能，如打开数据库，关闭数据库，执行数据库，查询结果和记录集，通配符替换等常用功能封装，表示层和应用层应用完全可以通过提供的函数借口完成。-Achieve the basic functions of database operations, such as opening the database, close the database, perform database query results, and record sets, wildcard replace common functions package, that layer and application layer applications can function by providing an excuse to complete.