socket 层是一个协议无关接口，它提供了一组通用函数来支持各种不同协议。
The sockets layer is a protocol agnostic interface that provides a set of common functions to support a variety of different protocols.
包装类隐藏了对底层Win32函数的调用并提供了一种舒适的通用接口。
A wrapper class hides the calls to the low-level Win32 functions and provides a comfortable generic interface.
通过数据库调用函数来实现对异构数据库的操作，该通用数据库接口具有通用、简单、可扩展、可优化等特点。
By communicating with the heterogeneous database by calling a series of database functions, the UDB interface is universal, simple, extensible and can be optimized.
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