DVD出租系统【5】界面初始化进一步完善

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/sunjikui1255326447/article/details/89024456

1、本节目的，完成下图这两个地方功能：

2、添加变量，DVD名字变量。

3、在头文件中添加函数声明：

4、在CPP中添加函数（初始化Combox控件），将函数添加到MFC初始化函数：

void CDVDRentDlg::InitDVDNameComboBox()
{
	_RecordsetPtr pDvdNameRecordset;
	pDvdNameRecordset.CreateInstance(__uuidof(Recordset));
	CString strSQL;
	strSQL = _T("SELECT sDVDName FROM tbDVDInfo");
	try
	{
		HRESULT hr = pDvdNameRecordset->Open(_variant_t(strSQL), m_pConnection.GetInterfacePtr(), adOpenDynamic, adLockOptimistic, adCmdText);
		if (FAILED(hr)) {
			return;
		}
	}
	catch (_com_error *e) {
		MessageBox(e->ErrorMessage());
		return;
	}

	CString strValue;
	_variant_t var;

	int iCurrIdx = 0;
	m_comboDVD.InsertString(iCurrIdx++, _T(""));
	try
	{
		while (!pDvdNameRecordset->GetadoEof())
		{
			var = pDvdNameRecordset->GetCollect(_T("sDVDName"));
			if (var.vt != NULL) {
				strValue = (LPCTSTR)_bstr_t(var);
				m_comboDVD.InsertString(iCurrIdx++, strValue);
				pDvdNameRecordset->MoveNext();
			}
		}

		pDvdNameRecordset->Close();
		pDvdNameRecordset = NULL;
	}
	catch (_com_error *e) {
		MessageBox(e->ErrorMessage());
		return;
	}
}

 5、运行如图：

6、接下里插入查询按钮的时间响应，同样在头文件声明函数，然后在.cpp文件添加函数代码：

void CDVDRentDlg::OnBnClickedButtonQuery()
{
	// TODO: 在此添加控件通知处理程序代码
	UpdateData(TRUE);
	_RecordsetPtr pQueryRecordset;
	pQueryRecordset.CreateInstance(__uuidof(Recordset));

	CString strDataFrom, strDataTo, strDVDName;
	m_comboDVD.GetWindowText(strDVDName);

	CString strSQL;
	if ((!m_check_Date) && m_name.IsEmpty() && strDVDName.IsEmpty()) {
		strSQL = _T("SELECT * FROM tbRentInfo");
	}
	else {
		strSQL = _T("SELECT * FROM tbRentInfo where");
	}

	if (m_check_Date) {
		CTime timeFrom, timeTo;
		m_DateFrom.GetTime(timeFrom);
		m_DateTo.GetTime(timeTo);

		m_DateFrom.GetWindowText(strDataFrom);
		m_DateTo.GetWindowText(strDataTo);

		if (timeFrom.GetMonth() > timeTo.GetMonth()) {
			MessageBox(_T("日期设置错误."));
			return;
		}
		else if (timeFrom.GetMonth() == timeTo.GetMonth()) {
			if (timeFrom.GetDay() > timeTo.GetDay()) {
				MessageBox(_T("日期设置错误."));
				return;
			}
		}

		strSQL.AppendFormat(_T(" sDate>=\'%s\' and sDate<=\'%s\'"), strDataFrom, strDataTo);
	}

	if (!m_name.IsEmpty()) {
		if (m_check_Date) {
			strSQL.AppendFormat(_T(" and sName=\'%s\'"), m_name);
		}
		else {
			strSQL.AppendFormat(_T(" sName=\'%s\'"), m_name);
		}
	}

	if (!strDVDName.IsEmpty()) {
		if ((!m_check_Date) && m_name.IsEmpty()) {
			strSQL.AppendFormat(_T(" sDVDID=%s"), QueryDVDId(strDVDName));
		}
		else {
			strSQL.AppendFormat(_T(" and sDVDID=%s"), QueryDVDId(strDVDName));
		}
	}

	//////////////////////////////////////////////////////////////////////////
	//上面构造好SQL查询语句之后，下面就开始查询啦
	try
	{
		HRESULT hr = pQueryRecordset->Open(_variant_t(strSQL), m_pConnection.GetInterfacePtr(), adOpenDynamic, adLockOptimistic, adCmdText);
		if (FAILED(hr)) {
			return;
		}
	}
	catch (_com_error* e)
	{
		MessageBox(e->ErrorMessage());
		return;
	}
	//判断记录集是否为空
	if (pQueryRecordset->GetadoEof()) {
		MessageBox(_T("记录集为空。。。"));
		return;
	}
	else {
		_variant_t var;
		CString strValue;
		int curItem = 0;

		m_rentInfoList.DeleteAllItems();

		try {
			while (!pQueryRecordset->GetadoEof()) {
				var = pQueryRecordset->GetCollect((long)0);
				if (var.vt != NULL)
					strValue = (LPCTSTR)_bstr_t(var);
				m_rentInfoList.InsertItem(curItem, strValue);

				var = pQueryRecordset->GetCollect(_T("sName"));
				if (var.vt != NULL)
					strValue = (LPCTSTR)_bstr_t(var);
				m_rentInfoList.SetItemText(curItem, 1, strValue);

				var = pQueryRecordset->GetCollect(_T("sDVDID"));
				if (var.vt != NULL)
					strValue = (LPCTSTR)_bstr_t(var);
				m_rentInfoList.SetItemText(curItem, 2, QueryDVDName(strValue));

				var = pQueryRecordset->GetCollect(_T("sDate"));
				if (var.vt != NULL)
					strValue = (LPCTSTR)_bstr_t(var);
				m_rentInfoList.SetItemText(curItem, 3, strValue);

				pQueryRecordset->MoveNext();
				curItem++;
			}
		}
		catch (_com_error *e) {
			MessageBox(e->ErrorMessage());
			return;
		}
	}

	pQueryRecordset->Close();
	pQueryRecordset = NULL;
}

CString CDVDRentDlg::QueryDVDId(CString& DVDName)
{
	HRESULT hr;
	_RecordsetPtr pRentRecordset;
	hr = pRentRecordset.CreateInstance(__uuidof(Recordset));
	if (FAILED(hr)) {
		MessageBox(_T("创建记录集对象失败."));
		return FALSE;
	}
	try
	{
		CString strSQL;
		CString strDVDName;
		strDVDName=_T("'"+DVDName);
		strDVDName = strDVDName + _T("'");
		strSQL = _T("select * from tbDVDInfo where sDVDName="+strDVDName);
		MessageBox(strSQL);
		hr = pRentRecordset->Open(_variant_t(strSQL), m_pConnection.GetInterfacePtr(), adOpenDynamic, adLockOptimistic, adCmdText);
		if (SUCCEEDED(hr)) {
			_variant_t var;
			CString strValue;
			var = pRentRecordset->GetCollect(_T("sDVDID"));
			if (var.vt != NULL) {
				strValue = (LPCTSTR)_bstr_t(var);
				MessageBox(strValue);
				return strValue;
			}
		}
		else {
			MessageBox(_T("打开结果记录集失败."));
			return FALSE;
		}
	}
	catch (_com_error &e) {
		MessageBox(e.ErrorMessage());
		return FALSE;
	}
	pRentRecordset->Close();
	pRentRecordset = NULL;
}

7、运行结果如下：

8、本节工程地址：

链接：https://pan.baidu.com/s/16i5MlvklTdhFZ0tbR4Lb9A 
提取码：zeei