datalinkdemodlg.cpp

数据访问的定义类

// DataLinkDemoDlg.cpp : implementation file
//

#include "stdafx.h"
#include "DataLinkDemo.h"
#include "DataLinkDemoDlg.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()

/////////////////////////////////////////////////////////////////////////////
// CDataLinkDemoDlg dialog

CDataLinkDemoDlg::CDataLinkDemoDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CDataLinkDemoDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CDataLinkDemoDlg)
	m_strConnectionString = _T("Provider=OraOLEDB.Oracle.1;Persist Security Info=False;User ID=;Password=;Data Source=;");
	m_strSQL = _T("SELECT * FROM tbl");
	//}}AFX_DATA_INIT
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CDataLinkDemoDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CDataLinkDemoDlg)
	DDX_Text(pDX, IDC_EDIT1, m_strConnectionString);
	DDX_Text(pDX, IDC_EDIT2, m_strSQL);
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CDataLinkDemoDlg, CDialog)
	//{{AFX_MSG_MAP(CDataLinkDemoDlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(IDC_TEST, OnTestConnect)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CDataLinkDemoDlg message handlers

BOOL CDataLinkDemoDlg::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);
		}
	}

	SetIcon(m_hIcon, TRUE);			// Set big icon
	SetIcon(m_hIcon, FALSE);		// Set small icon
	
	// TODO: Add extra initialization here
	
	return TRUE;  // return TRUE  unless you set the focus to a control
}

void CDataLinkDemoDlg::OnOK()
{
	UpdateData(TRUE);

	CString strPrompt;
	CConnectionString connection = m_strConnectionString;
	if (!connection.TestConnect())
	{
		AfxGetErrorMessage(strPrompt);
		MessageBox(strPrompt, _T("数据库链接"), MB_ICONEXCLAMATION|MB_OK);
		return;
	}
	AfxSetDataLink(connection);

	CSqlString strSQL = m_strSQL;
	CString strValue = strSQL.Execute();
	SetDlgItemText(IDC_EDIT3, strValue);

	if (strSQL.GetRecordsAffected() < 0)
	{
		AfxGetErrorMessage(strPrompt);
		MessageBox(strPrompt, _T("SQL执行命令"), MB_ICONEXCLAMATION|MB_OK);
		return;
	}

	// 附：打开数据表
	CRecordset recordset;
	recordset.Open(m_strSQL);
	while (!recordset.IsEOF())
	{
		for (int nIndex=0; nIndex<recordset.GetFieldCount(); nIndex++)
		{
			TRACE(_T("%s: %s"), recordset.GetFieldName(nIndex), recordset.GetString(nIndex));
		}
		TRACE0("\n");
		recordset.MoveNext();
	}
}

void CDataLinkDemoDlg::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 CDataLinkDemoDlg::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();
	}
}

HCURSOR CDataLinkDemoDlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}

void CDataLinkDemoDlg::OnTestConnect() 
{
	UpdateData(TRUE);

	CString strPrompt;
	CConnectionString connection = m_strConnectionString;
	if (!connection.TestConnect())
	{
		AfxGetErrorMessage(strPrompt);
		MessageBox(strPrompt, _T("数据库链接"), MB_ICONEXCLAMATION|MB_OK);
		return;
	}

	strPrompt = _T("测试连接成功。");
	MessageBox(strPrompt, _T("数据库链接"), MB_ICONEXCLAMATION|MB_OK);
	return;
}