rscgdlg8.cpp

学生选课系统 基于SQL数据库设计 能够实现一些功能

// RsCgDlg8.cpp : implementation file
//

#include "stdafx.h"
#include "RsCgDlg9.h"

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

/////////////////////////////////////////////////////////////////////////////
// CRsCgDlg6 dialog


CRsCgDlg6::CRsCgDlg6(CWnd* pParent /*=NULL*/)
	: CDialog(CRsCgDlg6::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("teaching");

	m_pRs = NULL;
	
	//{{AFX_DATA_INIT(CRsCgDlg6)
	m_strDlgs_no = _T("");
	m_strDlgcourse_no = _T("");
	m_dDlgscore = 0;
	//}}AFX_DATA_INIT
}

CRsCgDlg6::~CRsCgDlg6()
{
	m_pRs = NULL;
}

BOOL CRsCgDlg6::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 CRsCgDlg6::RefreshBoundData()
{
	if (adFldOK == ls_noStatus)
		m_strDlgs_no = m_wszs_no;
	else
		m_strDlgs_no = _T("");
	if (adFldOK == lcourse_noStatus)
		m_strDlgcourse_no = m_wszcourse_no;
	else
		m_strDlgcourse_no = _T("");
	if (adFldOK == lscoreStatus)
		m_dDlgscore = m_dscore;
	else
		m_dDlgscore = 0;

	UpdateData(FALSE);
}

void CRsCgDlg6::GenerateError(HRESULT hr, PWSTR pwszDescription)
{
	CString strError;

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

	AfxMessageBox(strError);
}

void CRsCgDlg6::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CRsCgDlg6)
	DDX_Text(pDX, IDC_EDIT_S_NO, m_strDlgs_no);
	DDX_Text(pDX, IDC_EDIT_COURSE_NO, m_strDlgcourse_no);
	DDX_Text(pDX, IDC_EDIT_SCORE, m_dDlgscore);
	//}}AFX_DATA_MAP
}


BEGIN_MESSAGE_MAP(CRsCgDlg6, CDialog)
	//{{AFX_MSG_MAP(CRsCgDlg6)
	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_DELCHOINFO, OnDelchoinfo)
	ON_BN_CLICKED(IDC_ADDCHOINFO, OnAddchoinfo)
	ON_BN_CLICKED(IDC_SAVECHOINFO, OnSavechoinfo)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CRsCgDlg6 message handlers

void CRsCgDlg6::OnBtnMoveFirst() 
{
	try
	{
		m_pRs->MoveFirst();
		RefreshBoundData();
	}
	catch (_com_error &e)
	{
		GenerateError(e.Error(), e.Description());
	}
}

void CRsCgDlg6::OnBtnMoveLast() 
{
	try
	{
		m_pRs->MoveLast();
		RefreshBoundData();
	}
	catch (_com_error &e)
	{
		GenerateError(e.Error(), e.Description());
	}
}

void CRsCgDlg6::OnBtnMoveNext() 
{
	try
	{
		m_pRs->MoveNext();
		RefreshBoundData();
	}
	catch (_com_error &e)
	{
		GenerateError(e.Error(), e.Description());
	}
}

void CRsCgDlg6::OnBtnMovePrevious() 
{
	try
	{
		m_pRs->MovePrevious();
		RefreshBoundData();
	}
	catch (_com_error &e)
	{
		GenerateError(e.Error(), e.Description());
	}
}

void CRsCgDlg6::OnDelchoinfo() 
{
	// TODO: Add your control notification handler code here
	try
	{
	    
		if(MessageBox("删除当前记录?",NULL,MB_YESNO)==IDYES)
		{	//在用户确定后执行删除操作
			m_pRs->Delete(adAffectCurrent);
			m_pRs->MoveNext();
			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)
	{
		m_pRs->CancelBatch(adAffectCurrent);  //若发生错误，则撤销删除操作
		MessageBox(e.Description());
	}
	
}


//添加
void CRsCgDlg6::OnAddchoinfo() 
{
	// 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=3;				//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[3],val[3];			//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]="s_no";
		fld[1]="course_no";
		fld[2]="score";
		//设置字段值数组元素值
		val[0]=m_strDlgs_no;		
		val[1]=m_strDlgcourse_no;	
		//val[2]=m_strDlgscore;
		

		//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<3;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());
	}	
}

void CRsCgDlg6::OnSavechoinfo() 
{
	// 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=3;				//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[3],val[3];			//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]="s_no";
		fld[1]="course_no";
		fld[2]="score";
		//设置字段值数组元素值
		val[0]=m_strDlgs_no;		
		val[1]=m_strDlgcourse_no;
		//val[2]=m_strDlgscore;
				
		//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<3;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->Update(&flds,&vals);	//使用安全数组修改当前记录
		MessageBox("成功保存数据！");
	}
	catch (_com_error &e){
		m_pRs->CancelUpdate();			// 若发生错误，则撤销修改
		MessageBox(e.Description());
	}	
	
}