很好的帮助初学者学习数据库的代码 #if !defined(AFX_LHWY_H__D043238F_FEF1_4E89_B1E9_B5D86538095B__INCLUDED_) #define AFX_LHWY_H__D043238F_FEF1_4E89_B1E9_B5D86538095B__INCLUDED_ #if _MSC_VER > 1000 #pragma once #endif // _MSC_VER > 1000 #ifndef __AFXWIN_H__ #error include 'stdafx.h' before including this file for P