odbcdemodlg.cpp

主要介绍vc++6.0的编程过程

// ODBCDemoDlg.cpp : implementation file
//

#include "stdafx.h"
#include "ODBCDemo.h"
#include "ODBCDemoDlg.h"
#include "TermCode.h"

#include "about.h"

#define LEN_TERM_CODE 20

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CODBCDemoDlg dialog

CODBCDemoDlg::CODBCDemoDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CODBCDemoDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CODBCDemoDlg)
	m_lDueInDays = 0;
	m_lDiscountInDays = 0;
	m_dDiscountPctg = 0.0;
	//}}AFX_DATA_INIT
	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CODBCDemoDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CODBCDemoDlg)
	DDX_Control(pDX, IDC_LBX_TERM_CODES, m_lbxTermCodes);
	DDX_Text(pDX, IDC_EDT_DUE_IN_DAYS, m_lDueInDays);
	DDX_Text(pDX, IDC_EDT_DISCOUNT_IN_DAYS, m_lDiscountInDays);
	DDX_Text(pDX, IDC_EDT_DISCOUNT_PCTG, m_dDiscountPctg);
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CODBCDemoDlg, CDialog)
	//{{AFX_MSG_MAP(CODBCDemoDlg)
	ON_WM_SYSCOMMAND()
	ON_BN_CLICKED(ID_APP_ABOUT, OnAbout)
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_LBN_SELCHANGE(IDC_LBX_TERM_CODES, OnSelchangeLbxTermCodes)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CODBCDemoDlg message handlers

BOOL CODBCDemoDlg::OnInitDialog()
{
	CDialog::OnInitDialog();

	// Add "About..." menu item to system menu.

	// IDM_ABOUTBOX must be in the system command range.
	ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
	ASSERT(IDM_ABOUTBOX < 0xF000);

	CMenu* pSysMenu = GetSystemMenu(FALSE);
	if (pSysMenu != NULL)
	{
		CString strAboutMenu;
		strAboutMenu.LoadString(IDS_ABOUTBOX);
		if (!strAboutMenu.IsEmpty())
		{
			pSysMenu->AppendMenu(MF_SEPARATOR);
			pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
		}
	}

	// Set the icon for this dialog.  The framework does this automatically
	//  when the application's main window is not a dialog
	SetIcon(m_hIcon, TRUE);			// Set big icon
	SetIcon(m_hIcon, FALSE);		// Set small icon
	
	// TODO: Add extra initialization here
	FillTermCodesListbox ();
	
	return TRUE;  // return TRUE  unless you set the focus to a control
}

void CODBCDemoDlg::OnSysCommand(UINT nID, LPARAM lParam)
{
	if ((nID & 0xFFF0) == IDM_ABOUTBOX)
	{
		CAboutDlg dlgAbout;
		dlgAbout.DoModal();
	}
	else
	{
		CDialog::OnSysCommand(nID, lParam);
	}
}

// If you add a minimize button to your dialog, you will need the code below
//  to draw the icon.  For MFC applications using the document/view model,
//  this is automatically done for you by the framework.

void CODBCDemoDlg::OnPaint() 
{
	if (IsIconic())
	{
		CPaintDC dc(this); // device context for painting

		SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);

		// Center icon in client rectangle
		int cxIcon = GetSystemMetrics(SM_CXICON);
		int cyIcon = GetSystemMetrics(SM_CYICON);
		CRect rect;
		GetClientRect(&rect);
		int x = (rect.Width() - cxIcon + 1) / 2;
		int y = (rect.Height() - cyIcon + 1) / 2;

		// Draw the icon
		dc.DrawIcon(x, y, m_hIcon);
	}
	else
	{
		CDialog::OnPaint();
	}
}

// The system calls this to obtain the cursor to display while the user drags
//  the minimized window.
HCURSOR CODBCDemoDlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}

void CODBCDemoDlg::OnAbout()
{
 CAboutDlg().DoModal();
}

void CODBCDemoDlg:: FillTermCodesListbox ()
{
 BOOL bSuccess = FALSE;

 CString strFunction;

 SQLHENV henv = NULL;
 SQLHDBC hdbc = NULL;
 BOOL bIsConnected = FALSE;
 SQLHSTMT hstmt = NULL;

 SQLRETURN rc;

 SWORD    sMsgNum = 0;
 char     szState[7]="";
 SDWORD   pfNative=0;

 if (SQL_SUCCESS == (rc =
 ::SQLAllocHandle(SQL_HANDLE_ENV, SQL_NULL_HANDLE,
 &henv)))
 {
  if (SQL_SUCCESS == (rc = ::SQLSetEnvAttr(henv,
  SQL_ATTR_ODBC_VERSION, (SQLPOINTER) SQL_OV_ODBC3,
  SQL_IS_INTEGER)))
  {
   if (SQL_SUCCESS == (rc =
   ::SQLAllocHandle(SQL_HANDLE_DBC, henv, &hdbc)))
   {
    rc = ::SQLConnect(hdbc, 
     (SQLCHAR*)"Visual C++ 6 Bible",
     SQL_NTS,
     (SQLCHAR*)"", SQL_NTS, (SQLCHAR*)"", SQL_NTS);
    if ((SQL_SUCCESS == rc)
    || (SQL_SUCCESS_WITH_INFO == rc))
    {
     bIsConnected = TRUE;

     if (SQL_SUCCESS == (rc =
     ::SQLAllocHandle(SQL_HANDLE_STMT, hdbc, &hstmt)))
     {
      LPCSTR szSQL = "SELECT * FROM TermCodeMaster";
      if (SQL_SUCCESS == (rc = ::SQLPrepare(hstmt,
      (unsigned char*)szSQL, SQL_NTS)))
      {
       if (SQL_SUCCESS == (rc = ::SQLExecute(hstmt)))
       {
        SDWORD cb;
        char szTermCode[LEN_TERM_CODE];
        long lDueInDays;
        long lDiscountInDays;
        double dDiscountPctg;

        SQLBindCol(hstmt, 1, SQL_C_CHAR, szTermCode,
         LEN_TERM_CODE, &cb);

        SQLBindCol(hstmt, 2, SQL_C_LONG, &lDueInDays,
         0, &cb);

        SQLBindCol(hstmt, 3, SQL_C_LONG,
         &lDiscountInDays, 0, &cb);

        SQLBindCol(hstmt, 4, SQL_C_DOUBLE,
         &dDiscountPctg, 0, &cb);

        int iIndex;

        rc = SQLFetch(hstmt);
        while (SQL_SUCCESS == rc)
        {
         CTermCode* pTermCode = new CTermCode();
         pTermCode->m_strTermCode = szTermCode;
         pTermCode->m_lDueInDays = lDueInDays;
         pTermCode->m_lDiscountInDays=lDiscountInDays;
         pTermCode->m_dDiscountPctg = dDiscountPctg;

         iIndex=m_lbxTermCodes.AddString(szTermCode);
         m_lbxTermCodes.SetItemData(iIndex,
         (DWORD)pTermCode);

         rc = SQLFetch(hstmt);
        }
       }
      }
     }
    }
   }
  }
 }

 if (henv)
 {
  if (hdbc)
  {
   if (bIsConnected)
   {
    if (hstmt)
    {
     ::SQLFreeHandle(SQL_HANDLE_STMT, hstmt);
    }
    ::SQLDisconnect(hdbc);
    bIsConnected = FALSE;
   }
   ::SQLFreeHandle(SQL_HANDLE_DBC, hdbc);
   hdbc = NULL;
  }
  ::SQLFreeHandle(SQL_HANDLE_ENV, henv);
  henv = NULL;
 }
}

void CODBCDemoDlg::OnSelchangeLbxTermCodes() 
{
 int iIndex = m_lbxTermCodes.GetCurSel();
 if (LB_ERR != iIndex)
 {
  CTermCode* pTermCode =
   (CTermCode*)m_lbxTermCodes.GetItemData(iIndex);

  if (pTermCode)
  {
   m_lDueInDays = pTermCode->m_lDueInDays;
   m_lDiscountInDays = pTermCode->m_lDiscountInDays;
   m_dDiscountPctg = pTermCode->m_dDiscountPctg;

   UpdateData(FALSE);
  }
 }
}

BOOL CODBCDemoDlg::DestroyWindow() 
{
 CTermCode* pTermCode;
 int nTermCodes = m_lbxTermCodes.GetCount();
 for (int i = 0; i < nTermCodes; i++)
 {
  pTermCode =
   (CTermCode*)m_lbxTermCodes.GetItemData(i);

  if (pTermCode)
  {
   delete pTermCode;
  }
 }

 return CDialog::DestroyWindow();
}