myoledbsampledlg.cpp

使用OLE DB进行数据库编程

// MyOLEDBSampleDlg.cpp : implementation file
//

#include "stdafx.h"
#include "MyOLEDBSample.h"
#include "MyOLEDBSampleDlg.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()

/////////////////////////////////////////////////////////////////////////////
// CMyOLEDBSampleDlg dialog

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

void CMyOLEDBSampleDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CMyOLEDBSampleDlg)
	DDX_Control(pDX, IDC_LIST1, m_CustList);
	DDX_Text(pDX, IDC_EDIT1, m_SalesManName);
	DDV_MaxChars(pDX, m_SalesManName, 15);
	DDX_Text(pDX, IDC_EDIT2, m_CustomerName);
	DDV_MaxChars(pDX, m_CustomerName, 15);
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CMyOLEDBSampleDlg, CDialog)
	//{{AFX_MSG_MAP(CMyOLEDBSampleDlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_COMMAND(ID_DATABASE_CONNECT, OnDatabaseConnect)
	ON_COMMAND(ID_DATABASE_DISCONNECT, OnDatabaseDisconnect)
	ON_COMMAND(ID_DELETE_CUSTOMERS, OnDeleteCustomers)
	ON_BN_CLICKED(IDC_BUTTON1, OnButton1)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CMyOLEDBSampleDlg message handlers

BOOL CMyOLEDBSampleDlg::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
	
	return TRUE;  // return TRUE  unless you set the focus to a control
}

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

void CMyOLEDBSampleDlg::OnDatabaseConnect() 
{
	try
	{
		if(!m_Cnn.IsOpen()) // Check if database is opened
			m_Cnn.Open("TESTDB", "Admin", "");

		AfxMessageBox("Database connection successful");
	}
	catch(CSypODLException e)
	{
		e.DisplayError();
		AfxMessageBox("Solution : You have to create an ODBC DSN called 'TESTDB' to the \
		database that is provided with this application for test purpose.");
	}
}

void CMyOLEDBSampleDlg::OnDatabaseDisconnect() 
{
	m_Cnn.Close();
}

void CMyOLEDBSampleDlg::OnDeleteCustomers() 
{
	if(!m_Cnn.IsOpen()) // Check if database is opened
	{
		AfxMessageBox("You are not connected to the database yet.");
		return;
	}

	int Result = ::MessageBox(NULL, "Delete all customers?", "SURE!", MB_YESNO | MB_ICONSTOP);
	if(Result == IDNO)
		return;

	try
	{
		m_Cnn.Execute("DELETE FROM Customer"); // Execute method is used for action queries.

		AfxMessageBox("All customers are deleted.");
	}
	catch(CSypODLException e)
	{
		e.DisplayError();
	}		
}

void CMyOLEDBSampleDlg::OnButton1() 
{
	UpdateData();

	if(m_CustomerName.IsEmpty())
	{
		AfxMessageBox("Enter customer name first.");
		return;
	}
	else
		m_CustList.AddString(m_CustomerName);

	m_CustomerName = "";
	UpdateData(FALSE);	
}

void CMyOLEDBSampleDlg::OnOK() 
{
	UpdateData();
	if(!m_Cnn.IsOpen()) // Check if database is opened
	{
		AfxMessageBox("不能连接数据库.");
		return;
	}

	if(m_SalesManName.IsEmpty())
	{
		AfxMessageBox("必须输入销售人员的姓名.");
		return;
	}

	int CustCount = m_CustList.GetCount();

	if(CustCount == 0)
	{
		AfxMessageBox("输入顾客的姓名.");
		return;
	}

	// Create recordset for parent table 
	CSypODLRecordBase<CAccessor<CSalesManAccessor> >  mRsParent; 

	// Create recordset for child table 
	CSypODLRecordBase<CAccessor<CCustomerAccessor> >  mRsChild; 
																
	try
	{
		long SID;

		mRsParent.Open("SalesMan", &m_Cnn, 1); // Open parent table recordset
		if(mRsParent.IsEOF()) // Check if there is any record
			SID = 1;
		else
		{
			mRsParent.MoveLast(); // Move to the last record
			SID = mRsParent.GetAccessor()->m_SalesManID + 1; // Create new SalesmanID
		}
		
		m_Cnn.StartTransaction(); // Start transaction

		mRsChild.Open("Customer", &m_Cnn, 1); // Open child table recordset

		mRsParent.GetAccessor()->ClearRecord(); // Field buffer must be cleared
		mRsParent.GetAccessor()->m_SalesManID = SID; // Add SID to field buffer
		lstrcpy(mRsParent.GetAccessor()->m_SalesManName, m_SalesManName); // Add salesman name

		mRsParent.Insert(); // Insert row in the table

		for(int i=0; i<CustCount; i++)
		{
			CString mCustName;
			m_CustList.GetText(i, mCustName);

			mRsChild.GetAccessor()->ClearRecord(); // Field buffer must be cleared

			mRsChild.GetAccessor()->m_CustomerID_status = DBSTATUS_S_IGNORE;
			
			lstrcpy(mRsChild.GetAccessor()->m_CustomerName, mCustName);
			
			mRsChild.GetAccessor()->m_Address_status = DBSTATUS_S_ISNULL; // Insert NULL

			mRsChild.GetAccessor()->m_SalesManID = SID;

			mRsChild.Insert(); // Insert row in the child table

		}

	
		m_Cnn.Commit(); // Commit transaction.
	}
	catch(CSypODLException e)
	{
		m_Cnn.Abort(); // Rollback transaction in case of error
		e.DisplayError();
	}
	AfxMessageBox("记录添加成功.");
}