rscgdlg7.cpp

学生选课系统 基于SQL数据库设计 能够实现一些功能

// RsCgDlg7.cpp : implementation file
//

#include "stdafx.h"
#include "RsCgDlg8.h"

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

/////////////////////////////////////////////////////////////////////////////
// CRsCgDlg5 dialog


CRsCgDlg5::CRsCgDlg5(CWnd* pParent /*=NULL*/)
	: CDialog(CRsCgDlg5::IDD, pParent)
{
	m_strConnection = _T("Provider=SQLOLEDB.1;Integrated Security=SSPI;Persist Security Info=False;Initial Catalog=学生选课系统;Data Source=(local)");
	m_strCmdText = _T("department");

	m_pRs = NULL;
	
	//{{AFX_DATA_INIT(CRsCgDlg5)
	m_strDlgDnum = _T("");
	m_strDlgDname = _T("");
	m_strDlgDirector = _T("");
	//}}AFX_DATA_INIT
}

CRsCgDlg5::~CRsCgDlg5()
{
	m_pRs = NULL;
}

BOOL CRsCgDlg5::OnInitDialog()
{
	HRESULT hr = NOERROR;
	IADORecordBinding *piAdoRecordBinding = NULL;

	CDialog::OnInitDialog();

	try
	{
		m_pRs.CreateInstance(__uuidof(Recordset));

		m_pRs->CursorLocation = adUseClient;
		m_pRs->Open((LPCTSTR)m_strCmdText, (LPCTSTR)m_strConnection, adOpenKeyset, 
			adLockReadOnly, adCmdTableDirect);

		if (FAILED(hr = m_pRs->QueryInterface(__uuidof(IADORecordBinding), (LPVOID *)&piAdoRecordBinding)))
			_com_issue_error(hr);
		if (FAILED(hr = piAdoRecordBinding->BindToRecordset(this)))
			_com_issue_error(hr);

		RefreshBoundData();
	}
	catch (_com_error &e)
	{
		GenerateError(e.Error(), e.Description());
	}

	if (piAdoRecordBinding)
		piAdoRecordBinding->Release();

	return TRUE;
}

void CRsCgDlg5::RefreshBoundData()
{
	if (adFldOK == lDnumStatus)
		m_strDlgDnum = m_wszDnum;
	else
		m_strDlgDnum = _T("");
	if (adFldOK == lDnameStatus)
		m_strDlgDname = m_wszDname;
	else
		m_strDlgDname = _T("");
	if (adFldOK == lDirectorStatus)
		m_strDlgDirector = m_wszDirector;
	else
		m_strDlgDirector = _T("");

	UpdateData(FALSE);
}

void CRsCgDlg5::GenerateError(HRESULT hr, PWSTR pwszDescription)
{
	CString strError;

	strError.Format("Run-time error '%d (%x)'", hr, hr);
	strError += "\n\n";
	strError += pwszDescription;

	AfxMessageBox(strError);
}

void CRsCgDlg5::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CRsCgDlg5)
	DDX_Text(pDX, IDC_EDIT_DNUM, m_strDlgDnum);
	DDX_Text(pDX, IDC_EDIT_DNAME, m_strDlgDname);
	DDX_Text(pDX, IDC_EDIT_DIRECTOR, m_strDlgDirector);
	//}}AFX_DATA_MAP
}


BEGIN_MESSAGE_MAP(CRsCgDlg5, CDialog)
	//{{AFX_MSG_MAP(CRsCgDlg5)
	ON_BN_CLICKED(ID_BTN_MOVEFIRST, OnBtnMoveFirst)
	ON_BN_CLICKED(ID_BTN_MOVELAST, OnBtnMoveLast)
	ON_BN_CLICKED(ID_BTN_MOVENEXT, OnBtnMoveNext)
	ON_BN_CLICKED(ID_BTN_MOVEPREVIOUS, OnBtnMovePrevious)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CRsCgDlg5 message handlers

void CRsCgDlg5::OnBtnMoveFirst() 
{
	try
	{
		m_pRs->MoveFirst();
		RefreshBoundData();
	}
	catch (_com_error &e)
	{
		GenerateError(e.Error(), e.Description());
	}
}

void CRsCgDlg5::OnBtnMoveLast() 
{
	try
	{
		m_pRs->MoveLast();
		RefreshBoundData();
	}
	catch (_com_error &e)
	{
		GenerateError(e.Error(), e.Description());
	}
}

void CRsCgDlg5::OnBtnMoveNext() 
{
	try
	{
		m_pRs->MoveNext();
		RefreshBoundData();
	}
	catch (_com_error &e)
	{
		GenerateError(e.Error(), e.Description());
	}
}

void CRsCgDlg5::OnBtnMovePrevious() 
{
	try
	{
		m_pRs->MovePrevious();
		RefreshBoundData();
	}
	catch (_com_error &e)
	{
		GenerateError(e.Error(), e.Description());
	}
}