ODBC C编程访问数据库

 新建一个Win32 Application，并在相应文件夹下新建一个book.mdb， 里面有一个表BookInfo，表中有以下几例：
id:
BookName:
Author:
等；
//------------------------------------------------------------------------------
// Copyright (c) 2009 eryar All rights reserved.
//
// File : Main.cpp
// Author : eryar@163.com
// Date : 2009-11-8 16:09
// Version : 1.0v
//
// Description : ODBC编写程序访问数据库的操作示例。
//
//==============================================================================
#include <windows.h>
#include <sqlext.h>
#include <odbcinst.h>
#define IDM_FILE_OPEN 100001
#define IDM_FILE_EXIT 100002
#define IDM_HELP_CONTENT 200001
#define IDM_HELP_ABOUT 200002
#define IDM_DATA_CONNECT 300001
#define IDM_DATA_QUERY 300002
char* szAppName = "ODBC Demo";
HINSTANCE ghInst;
HMENU WinMainMenu(HWND);
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
int WINAPI WinMain(HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPSTR lpCmdLine,
int nShowCmd)
{
HWND hWnd;
MSG Msg;
WNDCLASS wndclass;
char* szClassName = "CODBC";
ghInst = hInstance;
wndclass.style = CS_HREDRAW|CS_VREDRAW;
wndclass.cbClsExtra = 0;
wndclass.cbWndExtra = 0;
wndclass.lpfnWndProc = WndProc;
wndclass.hInstance = hInstance;
wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);
wndclass.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH);
wndclass.lpszMenuName = NULL;
wndclass.lpszClassName = szClassName;
if (!RegisterClass(&wndclass)) {
MessageBox(NULL, "This program requires Windows NT! ", szAppName, MB_OK|MB_ICONERROR);
return 0;
}
hWnd = CreateWindow(szClassName,
szAppName,
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, CW_USEDEFAULT,
CW_USEDEFAULT, CW_USEDEFAULT,
NULL,
NULL,
hInstance,
NULL);
ShowWindow(hWnd, nShowCmd);
UpdateWindow(hWnd);
while (GetMessage(&Msg, NULL, 0, 0)) {
Tra