dyndatadlg.cpp

动态连接ODBC数据库.使用通过数据源的名称动态链接访问ODBC数据库

// DynDataDlg.cpp : implementation file
//

#include "stdafx.h"
#include "DynData.h"
#include "DynDataDlg.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()

/////////////////////////////////////////////////////////////////////////////
// CDynDataDlg dialog

CDynDataDlg::CDynDataDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CDynDataDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CDynDataDlg)
	m_sFirstString = _T("");
	m_sSecondString = _T("");
	//}}AFX_DATA_INIT
	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
	m_pConnectionPool = NULL;
}

CDynDataDlg::~CDynDataDlg()
{
	// Clean up after the connectionpool
	if(m_pConnectionPool != NULL)
		delete m_pConnectionPool;
}

void CDynDataDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CDynDataDlg)
	DDX_Control(pDX, IDC_COMBO2, m_Combo2);
	DDX_Control(pDX, IDC_COMBO1, m_Combo1);
	DDX_Text(pDX, IDC_EDIT1, m_sFirstString);
	DDV_MaxChars(pDX, m_sFirstString, 255);
	DDX_Text(pDX, IDC_EDIT2, m_sSecondString);
	DDV_MaxChars(pDX, m_sSecondString, 255);
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CDynDataDlg, CDialog)
	//{{AFX_MSG_MAP(CDynDataDlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(IDC_BUTTON1, OnButton1)
	ON_BN_CLICKED(IDC_BUTTON2, OnButton2)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CDynDataDlg message handlers

BOOL CDynDataDlg::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
	InitializeDBConnections();
	
	return TRUE;  // return TRUE  unless you set the focus to a control
}

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

// Funvtion : InitializeDBConnections
// Purpose  : Inits all database connections
BOOL CDynDataDlg::InitializeDBConnections()
{
	// Build up the Connection Pool object first
	
	if(m_pConnectionPool != NULL)
		delete m_pConnectionPool;

	m_pConnectionPool = new CConnectionPool();

	// Add a connection to the connectionpool if it does not exists allready
	if(!m_pConnectionPool->GetConnection("TestDSN1"))
	{
		CDBConnection *pCon = new CDBConnection();
		// If you want to force logon dialog use this
		// pCon->ConnectToDataBase(TestDSN1,"","",TRUE);

		// Otherwise use this
		pCon->ConnectToDataBase("TestDSN1","","",FALSE);
		m_pConnectionPool->AddConnection(pCon);		
	}//if(!m_pConPool->GetConnection("TestDSN1"))

	// Add a connection to the connectionpool if it does not exists allready
	if(!m_pConnectionPool->GetConnection("TestDSN2"))
	{
		CDBConnection *pCon2 = new CDBConnection();
		// If you want to force logon dialog use this
		// pCon2->ConnectToDataBase(TestDSN2,"","",TRUE);

		// Otherwise use this
		pCon2->ConnectToDataBase("TestDSN2","","",FALSE);
		m_pConnectionPool->AddConnection(pCon2);		
	}//if(!m_pConPool->GetConnection("TestDSN2"))

	// So far we have established two database connections and now are ready to initialize the comboboxes
	// database background.

	m_Combo1.m_sDSN = _T("TestDSN1");
	m_Combo1.m_sTableName = _T("T_DemoTable");
	m_Combo1.m_sColumnName = _T("C_First");
	m_Combo1.SetConnectionPool(m_pConnectionPool);

	m_Combo2.m_sDSN = _T("TestDSN2");
	m_Combo2.m_sTableName = _T("T_DemoTable");
	m_Combo2.m_sColumnName = _T("C_Second");
	m_Combo2.SetConnectionPool(m_pConnectionPool);

	return TRUE;
}//BOOL CDynDataDlg::InitializeDBConnections()

void CDynDataDlg::OnButton1() 
{
	UpdateData(TRUE);
	
	try
	{
		CDBConnection * pCon = m_pConnectionPool->GetConnection("TestDSN1");
		pCon->PrepareFieldExchange();
		
		CDBField *pF1  = new CDBField();
		pF1->m_sColumn = "C_First";
		pF1->m_sValue  = m_sFirstString;
		pCon->m_pFields.Add(pF1);

		if(!pCon->AddNewRow("T_DemoTable"))
		{			
			return;
		}		
	}//try
	catch(CDBException e)
	{
		AfxMessageBox(e.m_strError,MB_OK | MB_ICONSTOP);
		e.Delete();
		return ;
	}//catch(CDBException e)
	
	UpdateData(FALSE);
}//void CDynDataDlg::OnButton1() 

void CDynDataDlg::OnButton2() 
{
	UpdateData(TRUE);
	try
	{
		CDBConnection * pCon = m_pConnectionPool->GetConnection("TestDSN2");
		pCon->PrepareFieldExchange();
		
		CDBField *pF1  = new CDBField();
		pF1->m_sColumn = "C_Second";
		pF1->m_sValue  = m_sSecondString;
		pCon->m_pFields.Add(pF1);

		if(!pCon->AddNewRow("T_DemoTable"))
		{			
			return;
		}		
	}//try
	catch(CDBException e)
	{
		AfxMessageBox(e.m_strError,MB_OK | MB_ICONSTOP);
		e.Delete();
		return;
	}//catch(CDBException e)
	
	UpdateData(FALSE);
}//void CDynDataDlg::OnButton2()