dialogcou.cpp

这是学生信息管理系统的源码

		{
			AfxMessageBox("表内数据已经为空！");
			m_btnQuery.EnableWindow(FALSE);
			m_btnDelete.EnableWindow(FALSE);
			m_btnModify.EnableWindow(FALSE);
			m_btnFirst.EnableWindow(FALSE);
			m_btnPre.EnableWindow(FALSE);
			m_btnNext.EnableWindow(FALSE);
			m_btnLast.EnableWindow(FALSE);
			m_btnOK.SetFocus();	
			return;
		}

		//显示最后一条记录
		m_pRecordset->MoveLast();

		var = m_pRecordset->GetCollect("CouID");
		if(var.vt != VT_NULL)		
		m_CouID = var.iVal ;

		var = m_pRecordset->GetCollect("CouName");
		str = (LPCSTR)_bstr_t(var);
		m_CouName = str;

		var = m_pRecordset->GetCollect("CouKind");
		str = (LPCSTR)_bstr_t(var);
		m_CouKind = str;

		var = m_pRecordset->GetCollect("CouScore");		
		m_CouScore = var.iVal; 

		var = m_pRecordset->GetCollect("CouTea");
		m_CouTea = var.iVal;
	
		UpdateData(false);				
	}
	catch(_com_error *e)
	{
		AfxMessageBox(e->ErrorMessage());
	}
}

//////////////////////////
//
//执行修改功能
//
/////////////////////////
void CDialogCOU::Modify()
{
	//定义变量
	_variant_t var;
	CString str;
	//更新控件变量的值
	UpdateData(true);

	if(m_CouID == 0 || m_CouTea == 0)
	{
		AfxMessageBox("课程号和导师名都不能为空!");	
		return;
	}

	//判断修改后的导师号是否存在
	if(m_CouTea !=0)
	{
        m_pRecordset->Close();

		OpenTEACHERS();

		if(m_pRecordset->BOF)
		{
			AfxMessageBox("导师表为空，需先建立导师表！");
			m_pRecordset->Close();
			OpenCOURSES();
			return;
		}
		else
		{
			m_pRecordset->MoveFirst();
			while(!m_pRecordset->adoEOF)
			{
				var = m_pRecordset->GetCollect("TeaID");
				if(m_CouTea == var.iVal)
				{
					break;
				}
				m_pRecordset->MoveNext();
			}
			if(m_pRecordset->adoEOF)
			{
				AfxMessageBox("没有这个导师号！");
				m_pRecordset->Close();
				OpenCOURSES();
				return;
			}
			else
			{
				m_pRecordset->Close();
				OpenCOURSES();
				m_pRecordset->MoveFirst();
				while(!m_pRecordset->adoEOF)
				{
					var = m_pRecordset->GetCollect("CouID");
					if(m_CouID == var.iVal)
					{
						break;
					}
					m_pRecordset->MoveNext();
				}
			}
		}		
	}
	//
	// 修改当前记录的字段值
	//
	try
	{
		var.iVal = m_CouID;
		m_pRecordset->PutCollect("CouID", var.iVal);
		
		m_pRecordset->PutCollect("CouName", _variant_t(m_CouName));

		m_pRecordset->PutCollect("CouKind", _variant_t(m_CouKind));

		var.iVal = m_CouScore;
		m_pRecordset->PutCollect("CouScore", var.iVal);

		var.iVal = m_CouTea;
		m_pRecordset->PutCollect("CouTea", var.iVal);

		m_pRecordset->Update();

		AfxMessageBox("修改成功!");			
	}
	catch(_com_error *e)
	{
		AfxMessageBox(e->ErrorMessage());
	}
}

void CDialogCOU::OnButtonOK() 
{
	// TODO: ADD your control notification handler code here	
	if(FOUNCTION == SEARCH)
	{
		Query();		
	}	
	else if(FOUNCTION == ADD)
	{
		Add();		
	}	
	else if(FOUNCTION == DEL)
	{
		Delete();		
	}	
	else if(FOUNCTION == MODIFY)		
	{
		Modify();		
	}	
}

void CDialogCOU::OnButtonGoBack() 
{
	// TODO: ADD your control notification handler code here	
	//关闭记录集，退出
	m_pRecordset->Close();
	OnCancel();	
}

void CDialogCOU::OnButtonAdd() 
{
	// TODO: ADD your control notification handler code here
	//
	//给所有显示控件一个添加之前的初值
	//
	m_CouID = 0;
	m_CouScore =  0;
	m_CouName = "";
	m_CouKind = "";
	m_CouTea  = 0;
	UpdateData(false);
	//更新FOUNCTION值
	FOUNCTION = ADD;
	//修改各个矩形按钮的属性
	m_btnQuery.EnableWindow(FALSE);
	m_btnAdd.SetState(TRUE);
	m_btnDelete.EnableWindow(FALSE);
	m_btnModify.EnableWindow(FALSE);
	m_btnFirst.EnableWindow(FALSE);
	m_btnPre.EnableWindow(FALSE);
	m_btnNext.EnableWindow(FALSE);
	m_btnLast.EnableWindow(FALSE);
	m_btnOK.SetFocus();
}

void CDialogCOU::OnButtonDelete() 
{
	// TODO: ADD your control notification handler code here
	if(MessageBox("真的删除？\n是请按“是”，\n否请按“否”！", NULL, MB_YESNO | MB_ICONQUESTION) == IDYES)
	{
		//更新FOUNCTION值
		FOUNCTION = DEL;
		OnButtonOK();
	}
	else
	{
		OnButtonCancel();
	}
}

void CDialogCOU::OnButtonModify() 
{
	// TODO: ADD your control notification handler code here
	//更新FOUNCTION值
	FOUNCTION = MODIFY;	
	m_ctlCouID.SetReadOnly();
	//修改各个矩形按钮的属性
	m_btnQuery.EnableWindow(FALSE);
	m_btnAdd.EnableWindow(FALSE);
	m_btnDelete.EnableWindow(FALSE);
	m_btnModify.SetState(TRUE);
	m_btnFirst.EnableWindow(FALSE);
	m_btnPre.EnableWindow(FALSE);
	m_btnNext.EnableWindow(FALSE);
	m_btnLast.EnableWindow(FALSE);
	m_btnOK.SetFocus();
}

void CDialogCOU::OnButtonFirst() 
{
	// TODO: ADD your control notification handler code here
	m_pRecordset->MoveFirst();
	_variant_t var;
	CString str;		
	
	try
	{
		var = m_pRecordset->GetCollect("CouID");
		if(var.vt != VT_NULL)		
		m_CouID = var.iVal ;

		var = m_pRecordset->GetCollect("CouName");
		str = (LPCSTR)_bstr_t(var);
		m_CouName = str;

		var = m_pRecordset->GetCollect("CouKind");
		str = (LPCSTR)_bstr_t(var);
		m_CouKind = str;

		var = m_pRecordset->GetCollect("CouScore");		
		m_CouScore = var.iVal; 

		var = m_pRecordset->GetCollect("CouTea");
		m_CouTea = var.iVal;
	
		UpdateData(false);
	}
	catch(_com_error *e)
	{
		AfxMessageBox(e->ErrorMessage());
	}	
}

void CDialogCOU::OnButtonPre() 
{
	// TODO: ADD your control notification handler code here
	
	m_pRecordset->MovePrevious();
	_variant_t var;
	CString str;	
	if(m_pRecordset->BOF)
	{
		MessageBox("已经是首记录！");
	    m_pRecordset->MoveFirst();
	}
	
	try
	{
		var = m_pRecordset->GetCollect("CouID");
		if(var.vt != VT_NULL)		
		m_CouID = var.iVal;

		var = m_pRecordset->GetCollect("CouName");
		str = (LPCSTR)_bstr_t(var);
		m_CouName = str;

		var = m_pRecordset->GetCollect("CouKind");
		str = (LPCSTR)_bstr_t(var);
		m_CouKind = str;

		var = m_pRecordset->GetCollect("CouScore");		
		m_CouScore = var.iVal; 

		var = m_pRecordset->GetCollect("CouTea");
		m_CouTea = var.iVal;
	
		UpdateData(false);
	}
	catch(_com_error *e)
	{
		AfxMessageBox(e->ErrorMessage());
	}	
}

void CDialogCOU::OnButtonNext() 
{
	// TODO: ADD your control notification handler code here
	m_pRecordset->MoveNext();
	_variant_t var;
	CString str;
	
	if(m_pRecordset->adoEOF)
	{
		MessageBox("已经是末记录！");
	    m_pRecordset->MoveLast();
	}
	
	try
	{
		var = m_pRecordset->GetCollect("CouID");
		if(var.vt != VT_NULL)		
		m_CouID = var.iVal;

		var = m_pRecordset->GetCollect("CouName");
		str = (LPCSTR)_bstr_t(var);
		m_CouName = str;

		var = m_pRecordset->GetCollect("CouKind");
		str = (LPCSTR)_bstr_t(var);
		m_CouKind = str;

		var = m_pRecordset->GetCollect("CouScore");		
		m_CouScore = var.iVal; 

		var = m_pRecordset->GetCollect("CouTea");
		m_CouTea = var.iVal;
	
		UpdateData(false);
	}
	catch(_com_error *e)
	{
		AfxMessageBox(e->ErrorMessage());
	}	
}

void CDialogCOU::OnButtonLast() 
{
	// TODO: ADD your control notification handler code here
	m_pRecordset->MoveLast();
	_variant_t var;
	CString str;		
	
	try
	{
		var = m_pRecordset->GetCollect("CouID");
		if(var.vt != VT_NULL)		
		m_CouID = var.iVal;

		var = m_pRecordset->GetCollect("CouName");
		str = (LPCSTR)_bstr_t(var);
		m_CouName = str;

		var = m_pRecordset->GetCollect("CouKind");
		str = (LPCSTR)_bstr_t(var);
		m_CouKind = str;

		var = m_pRecordset->GetCollect("CouScore");		
		m_CouScore = var.iVal; 

		var = m_pRecordset->GetCollect("CouTea");
		m_CouTea = var.iVal;
	
		UpdateData(false);
	}
	catch(_com_error *e)
	{
		AfxMessageBox(e->ErrorMessage());
	}	
}

void CDialogCOU::OnButtonCancel() 
{
	// TODO: ADD your control notification handler code here
	_variant_t var;
	CString str;
	FOUNCTION=INIT;
	//如果表为空，返回不做下面的操作
	if(m_pRecordset->BOF)
	{
		m_btnAdd.SetState(false);
		return;
	}	

	//修改各个矩形按钮的属性
	m_btnQuery.EnableWindow(true);
	m_btnAdd.EnableWindow(true);
	m_btnDelete.EnableWindow(true);
	m_btnModify.EnableWindow(true);
	m_btnFirst.EnableWindow(true);
	m_btnPre.EnableWindow(true);
	m_btnNext.EnableWindow(true);
	m_btnLast.EnableWindow(true);

	m_btnQuery.SetState(false);
	m_btnAdd.SetState(false);
	m_btnDelete.SetState(false);
	m_btnModify.SetState(false);
	m_btnFirst.SetState(false);
	m_btnPre.SetState(false);
	m_btnNext.SetState(false);
	m_btnLast.SetState(false);

	m_ctlCouID.SetReadOnly(FALSE);
	m_btnOK.SetFocus();	
	//
	//把m_pRecordset所指当前记录显示出来
	//
	if(m_pRecordset->adoEOF)
	{
		m_pRecordset->MoveLast();
	}
	try
	{
		var = m_pRecordset->GetCollect("CouID");
		if(var.vt != VT_NULL)		
		m_CouID = var.iVal ;

		var = m_pRecordset->GetCollect("CouName");
		str = (LPCSTR)_bstr_t(var);
		m_CouName = str;

		var = m_pRecordset->GetCollect("CouKind");
		str = (LPCSTR)_bstr_t(var);
		m_CouKind = str;

		var = m_pRecordset->GetCollect("CouScore");		
		m_CouScore = var.iVal;

		var = m_pRecordset->GetCollect("CouTea");
		m_CouTea = var.iVal;
	
		UpdateData(false);
	}
	catch(_com_error *e)
	{
		AfxMessageBox(e->ErrorMessage());
	}	
}