ado 数据库编程有一定的难度，且不易维护，使用时重复代码比较多，本动态链接库，对ado进行了封装，可以直接取出各种数据类型。-ADO database programming with a certain degree of difficulty, which is hard to maintain and use more repeat code, the dynamic link library, a right ado package can be directly out of var