dialogcho.cpp

这是学生信息管理系统的源码

			var.iVal = m_StuID;
			m_pRecordset->PutCollect("StuID", var.iVal);

			//写入PassOrNot字段
			m_pRecordset->PutCollect("PassOrNot", _variant_t(m_PassOrNot));

			//写入Score字段
			var.iVal = m_Score;
			m_pRecordset->PutCollect("Score", var.iVal);

			//更新SQL数据库
			m_pRecordset->Update();

			//当前记录移动到最后
			m_pRecordset->MoveLast();

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

//////////////////////////
//
//执行删除功能
//
/////////////////////////
void CDialogCHO::Delete()
{
	//定义变量
	_variant_t var;
	CString str;	

	//判断当前是否有记录
	if(m_CouID == 0)
	{
		MessageBox(" 没有记录！");
		return;
	}

	try
	{
		//
		// 删除当前行记录
		//
		m_pRecordset->Delete(adAffectCurrent);
		m_pRecordset->Update();
		m_pRecordset->MoveFirst();

		//判断删除后表内数据是否为空
		if(m_pRecordset->BOF)
		{
			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("StuID");
		if(var.vt != VT_NULL)		
		m_StuID = var.iVal;

		var = m_pRecordset->GetCollect("PassOrNot");
		str = (LPCSTR)_bstr_t(var);
		m_PassOrNot = str;

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

//////////////////////////
//
//执行修改功能
//
/////////////////////////
void CDialogCHO::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_StuID == 0)
	{
		AfxMessageBox("学号和课程号一个也不能为空!");
		return;
	}
	//
	// 修改当前记录的字段值
	//
	try
	{
		var.iVal = m_CouID;
		m_pRecordset->PutCollect("CouID", var.iVal);
		
		var.iVal = m_StuID;
		m_pRecordset->PutCollect("StuID", var.iVal);

		m_pRecordset->PutCollect("PassOrNot", _variant_t(m_PassOrNot));

		var.iVal = m_Score;
		m_pRecordset->PutCollect("Score", var.iVal);

		m_pRecordset->Update();

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

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

void CDialogCHO::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_Score =  0;
	m_StuID = 0;
	m_PassOrNot = "";
	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 CDialogCHO::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 CDialogCHO::OnButtonModify() 
{
	// TODO: ADD your control notification handler code here
	//更新FOUNCTION值
	FOUNCTION = MODIFY;
	m_ctlStuID.SetReadOnly();
	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 CDialogCHO::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("StuID");
		if(var.vt != VT_NULL)		
		m_StuID = var.iVal;

		var = m_pRecordset->GetCollect("PassOrNot");
		str = (LPCSTR)_bstr_t(var);
		m_PassOrNot = str;

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

void CDialogCHO::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("StuID");
		if(var.vt != VT_NULL)		
		m_StuID = var.iVal;

		var = m_pRecordset->GetCollect("PassOrNot");
		str = (LPCSTR)_bstr_t(var);
		m_PassOrNot = str;

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

void CDialogCHO::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("StuID");		
		m_StuID = var.iVal;

		var = m_pRecordset->GetCollect("PassOrNot");
		str = (LPCSTR)_bstr_t(var);
		m_PassOrNot = str;

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

void CDialogCHO::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("StuID");
		if(var.vt != VT_NULL)		
		m_StuID = var.iVal;

		var = m_pRecordset->GetCollect("PassOrNot");
		str = (LPCSTR)_bstr_t(var);
		m_PassOrNot = str;

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

void CDialogCHO::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_ctlStuID.SetReadOnly(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("StuID");
		if(var.vt != VT_NULL)		
		m_StuID = var.iVal;

		var = m_pRecordset->GetCollect("PassOrNot");
		str = (LPCSTR)_bstr_t(var);
		m_PassOrNot = str;

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