rscgdlg4.cpp

学生选课系统 基于SQL数据库设计 能够实现一些功能

// RsCgDlg4.cpp : implementation file
//

#include "stdafx.h"
#include "RsCgDlg5.h"

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

/////////////////////////////////////////////////////////////////////////////
// CRsCgDlg2 dialog


CRsCgDlg2::CRsCgDlg2(CWnd* pParent /*=NULL*/)
	: CDialog(CRsCgDlg2::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("classes");

	m_pRs = NULL;
	
	//{{AFX_DATA_INIT(CRsCgDlg2)
	m_strDlgclass_no = _T("");
	m_strDlgclass_name = _T("");
	m_strDlgclass_special = _T("");
	m_strDlgclass_dept = _T("");
	//}}AFX_DATA_INIT
}

CRsCgDlg2::~CRsCgDlg2()
{
	m_pRs = NULL;
}

BOOL CRsCgDlg2::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 CRsCgDlg2::RefreshBoundData()
{
	if (adFldOK == lclass_noStatus)
		m_strDlgclass_no = m_wszclass_no;
	else
		m_strDlgclass_no = _T("");
	if (adFldOK == lclass_nameStatus)
		m_strDlgclass_name = m_wszclass_name;
	else
		m_strDlgclass_name = _T("");
	if (adFldOK == lclass_specialStatus)
		m_strDlgclass_special = m_wszclass_special;
	else
		m_strDlgclass_special = _T("");
	if (adFldOK == lclass_deptStatus)
		m_strDlgclass_dept = m_wszclass_dept;
	else
		m_strDlgclass_dept = _T("");

	UpdateData(FALSE);
}

void CRsCgDlg2::GenerateError(HRESULT hr, PWSTR pwszDescription)
{
	CString strError;

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

	AfxMessageBox(strError);
}

void CRsCgDlg2::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CRsCgDlg2)
	DDX_Text(pDX, IDC_EDIT_CLASS_NO, m_strDlgclass_no);
	DDX_Text(pDX, IDC_EDIT_CLASS_NAME, m_strDlgclass_name);
	DDX_Text(pDX, IDC_EDIT_CLASS_SPECIAL, m_strDlgclass_special);
	DDX_Text(pDX, IDC_EDIT_CLASS_DEPT, m_strDlgclass_dept);
	//}}AFX_DATA_MAP
}


BEGIN_MESSAGE_MAP(CRsCgDlg2, CDialog)
	//{{AFX_MSG_MAP(CRsCgDlg2)
	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_ADDCLAINFO, OnAddclainfo)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CRsCgDlg2 message handlers

void CRsCgDlg2::OnBtnMoveFirst() 
{
	try
	{
		m_pRs->MoveFirst();
		RefreshBoundData();
	}
	catch (_com_error &e)
	{
		GenerateError(e.Error(), e.Description());
	}
}

void CRsCgDlg2::OnBtnMoveLast() 
{
	try
	{
		m_pRs->MoveLast();
		RefreshBoundData();
	}
	catch (_com_error &e)
	{
		GenerateError(e.Error(), e.Description());
	}
}

void CRsCgDlg2::OnBtnMoveNext() 
{
	try
	{
		m_pRs->MoveNext();
		RefreshBoundData();
	}
	catch (_com_error &e)
	{
		GenerateError(e.Error(), e.Description());
	}
}

void CRsCgDlg2::OnBtnMovePrevious() 
{
	try
	{
		m_pRs->MovePrevious();
		RefreshBoundData();
	}
	catch (_com_error &e)
	{
		GenerateError(e.Error(), e.Description());
	}
}


void CRsCgDlg2::OnAddclainfo() 
{
	// TODO: Add your control notification handler code here
	try
	{	
		long index[1];	
		VARIANT flds,vals;				//声明两个安全数组变量
		flds.vt=VT_ARRAY|VT_VARIANT;	//定义安全数组类型
		vals.vt=VT_ARRAY|VT_VARIANT;
		SAFEARRAYBOUND bound;		//声明安全数组边界变量
		bound.cElements=4;				//定义安全数组元素个数
		bound.lLbound=0;					//定义安全数组最小下标
		COleVariant fld[4],val[4];			//用于保存字段名称和字段值
		
		UpdateData(true);//将对话框数据传送给对应的变量
		//设置字段名称数组元素值
		fld[0]="class_no";
		fld[1]="class_name";
		fld[2]="class_special";
		fld[3]="class_dept";
		//设置字段值数组元素值
		val[0]=m_strDlgclass_no;		
		val[1]=m_strDlgclass_name;		
		val[2]=m_strDlgclass_special;		
		val[3]=m_strDlgclass_dept;				
		//创建安全数组
		flds.parray=::SafeArrayCreate(VT_VARIANT,1,&bound);
		vals.parray=::SafeArrayCreate(VT_VARIANT,1,&bound);
		for(int i=0;i<4;i++){	
			index[0]=i;
			::SafeArrayPutElement(flds.parray,index,&fld[i]);		//将字段名称存入安全数组
			::SafeArrayPutElement(vals.parray,index,&val[i]);		//将字段值称存入安全数组
		}
		m_pRs->AddNew(&flds,&vals);//使用安全数组添加新记录
		MessageBox("成功添加记录！");
	}
	catch (_com_error &e)
	{
		m_pRs->CancelUpdate();//若发生错误，则撤销添加记录操作
		MessageBox(e.Description());
	}	
	
}