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CODBCAccess: a CDatabase and CRecordset Wrapper

, 12 Mar 2003
A class to wrap the use of CDatabase and CRecordset into one object to communicate with databases
// ODBCExampleDlg.cpp : implementation file
//

#include "stdafx.h"
#include "ODBCExample.h"
#include "ODBCExampleDlg.h"
#include "Operations.h"
#include "Config.h"

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

/////////////////////////////////////////////////////////////////////////////
// CAboutDlg dialog used for App About

class CAboutDlg : public CDialog
{
public:
	CAboutDlg();

// Dialog Data
	//{{AFX_DATA(CAboutDlg)
	enum { IDD = IDD_ABOUTBOX };
	//}}AFX_DATA

	// ClassWizard generated virtual function overrides
	//{{AFX_VIRTUAL(CAboutDlg)
	protected:
	virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV support
	//}}AFX_VIRTUAL

// Implementation
protected:
	//{{AFX_MSG(CAboutDlg)
	//}}AFX_MSG
	DECLARE_MESSAGE_MAP()
};

CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)
{
	//{{AFX_DATA_INIT(CAboutDlg)
	//}}AFX_DATA_INIT
}

void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CAboutDlg)
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)
	//{{AFX_MSG_MAP(CAboutDlg)
		// No message handlers
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CODBCExampleDlg dialog

CODBCExampleDlg::CODBCExampleDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CODBCExampleDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CODBCExampleDlg)
		// NOTE: the ClassWizard will add member initialization here
	//}}AFX_DATA_INIT
	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CODBCExampleDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CODBCExampleDlg)
		// NOTE: the ClassWizard will add DDX and DDV calls here
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CODBCExampleDlg, CDialog)
	//{{AFX_MSG_MAP(CODBCExampleDlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(IDC_CONNECT, OnConnect)
	ON_BN_CLICKED(IDC_DATASOURCE, OnDatasource)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CODBCExampleDlg message handlers

BOOL CODBCExampleDlg::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
	
	//Configure the datasource which we are using by calling
	//CODBAccess::ConfigDataSource:
	CFileFind fullName;
	if(fullName.FindFile("employ.mdb"))
	{
		fullName.FindNextFile();
		m_db.ConfigDataSource(DATASOURCE_ADD,
			"ODBCExample", fullName.GetFilePath(), false,
			"ODBCExample Database");
	}
	
	return TRUE;  // return TRUE  unless you set the focus to a control
}

void CODBCExampleDlg::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 CODBCExampleDlg::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 CODBCExampleDlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}

//Static function to display a message box based on an error code
void CODBCExampleDlg::DisplayErrorBox(CODBCAccess *db)
{
	CString type;
	CString explain;
	int code = db->GetLastErrCode();

	//Get the equivalent type from the code:
	if(code == 0)
	{
		type = "RETURN_SUCCESS";
		explain = "The operation was successful!";
	}
	else if(code == 1)
	{
		type = "RETURN_ARGUMENT";
		explain = "You tried to call a function with a bad argument.";
	}
	else if(code == 2)
	{
		type = "RETURN_ERRMSG";
		explain = "Generic error message, use GetLastErrMsg to find the specific problem.";
	}
	else if(code == 3)
	{
		type = "RETURN_DB";
		explain = "The database was not opened beforehand.";
	}
	else if(code == 4)
	{
		type = "RETURN_CRITICAL";
		explain = "There was a critical error, the database was closed "
			"for safety.  Use GetLastErrMsg to examine the exact problem.";
	}

	//Show the message box:
	::MessageBox(AfxGetApp()->m_pMainWnd->GetSafeHwnd(), "CODBCAccess returned the following information from the "
		"last function call:\n\nType: " + type + "\nExplaination: " + explain +
		"\n\nError Message: " + db->GetLastErrMsg(),
		"CODBCAccess Returned Information", MB_ICONINFORMATION);
}

//Configures a data source
void CODBCExampleDlg::OnDatasource() 
{
	//Open the config dialog:
	CConfig con;
	con.db = &m_db;
	con.DoModal();
}

//Connects to a data source
void CODBCExampleDlg::OnConnect() 
{
	//Connect using selected data source:
	m_db.Connect();

	//And open the operations dialog:
	COperations op;
	op.db = &m_db;
	op.DoModal();

	//When doModal returns, we have to close the db:
	m_db.Disconnect();
}

void CODBCExampleDlg::OnOK() 
{
	//Delete the datasource we made:
	//(if the function fails it doesn't matter):
	m_db.ConfigDataSource(DATASOURCE_DEL, "ODBCExample", 
		"ODBCExample", false);
	
	CDialog::OnOK();
}

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About the Author

Alexander Wiseman

United States United States
I work with C++, C#, Perl, PHP, HTML (with a lot of CSS), and a little bit of ASP.NET. I have been programming for 7 years.
 
I also enjoy translating Latin, and especially reading authors whose primary language was Latin, including Virgil (or Vergil for the Latinate spelling), Julius Caesar, Catullus, Cicero, and some others (like Martial). I enjoy classical music, most especially Mozart and Bach.

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