rscgdlg6.cpp

学生选课系统 基于SQL数据库设计 能够实现一些功能

// RsCgDlg6.cpp : implementation file
//

#include "stdafx.h"
#include "RsCgDlg7.h"

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

/////////////////////////////////////////////////////////////////////////////
// CRsCgDlg4 dialog


CRsCgDlg4::CRsCgDlg4(CWnd* pParent /*=NULL*/)
	: CDialog(CRsCgDlg4::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("choice");

	m_pRs = NULL;
	
	//{{AFX_DATA_INIT(CRsCgDlg4)
	m_strDlgcourse_no = _T("");
	m_strDlgt_no = _T("");
	//}}AFX_DATA_INIT
}

CRsCgDlg4::~CRsCgDlg4()
{
	m_pRs = NULL;
}

BOOL CRsCgDlg4::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 CRsCgDlg4::RefreshBoundData()
{
	if (adFldOK == lcourse_noStatus)
		m_strDlgcourse_no = m_wszcourse_no;
	else
		m_strDlgcourse_no = _T("");
	if (adFldOK == lt_noStatus)
		m_strDlgt_no = m_wszt_no;
	else
		m_strDlgt_no = _T("");

	UpdateData(FALSE);
}

void CRsCgDlg4::GenerateError(HRESULT hr, PWSTR pwszDescription)
{
	CString strError;

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

	AfxMessageBox(strError);
}

void CRsCgDlg4::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CRsCgDlg4)
	DDX_Text(pDX, IDC_EDIT_COURSE_NO, m_strDlgcourse_no);
	DDX_Text(pDX, IDC_EDIT_T_NO, m_strDlgt_no);
	//}}AFX_DATA_MAP
}


BEGIN_MESSAGE_MAP(CRsCgDlg4, CDialog)
	//{{AFX_MSG_MAP(CRsCgDlg4)
	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)
	ON_BN_CLICKED(IDC_DELTEACHINGINFO, OnDelteachinginfo)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CRsCgDlg4 message handlers

void CRsCgDlg4::OnBtnMoveFirst() 
{
	try
	{
		m_pRs->MoveFirst();
		RefreshBoundData();
	}
	catch (_com_error &e)
	{
		GenerateError(e.Error(), e.Description());
	}
}

void CRsCgDlg4::OnBtnMoveLast() 
{
	try
	{
		m_pRs->MoveLast();
		RefreshBoundData();
	}
	catch (_com_error &e)
	{
		GenerateError(e.Error(), e.Description());
	}
}

void CRsCgDlg4::OnBtnMoveNext() 
{
	try
	{
		m_pRs->MoveNext();
		RefreshBoundData();
	}
	catch (_com_error &e)
	{
		GenerateError(e.Error(), e.Description());
	}
}

void CRsCgDlg4::OnBtnMovePrevious() 
{
	try
	{
		m_pRs->MovePrevious();
		RefreshBoundData();
	}
	catch (_com_error &e)
	{
		GenerateError(e.Error(), e.Description());
	}
}

void CRsCgDlg4::OnDelteachinginfo() 
{
	// TODO: Add your control notification handler code here
	try
	{
		if (MessageBox("删除当前记录？",NULL,MB_YESNO)==IDYES)
		{		
			m_pRs->Delete(adAffectCurrent);	//删除当前记录
			m_pRs->MoveNext();				//使下一条记录成为当前记录
			if (m_pRs->EndOfFile)		
				//没有下一条记录，则使上一条记录成为当前记录
				m_pRs->MoveLast();
			RefreshBoundData();
		}
	}
	catch (_com_error &e)
	{
		//若发生错误，则撤销删除操作
		m_pRs->CancelBatch(adAffectCurrent);
		MessageBox(e.Description());
	}	
}