MFC中已经有m_pConnection->Open("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=test.accdb", "", "", adModeUnknown);连接数据库,现在要求写一段代码实现对食堂窗口表中的受欢迎程度进行降序排序并在ID为ID_List1的列表中显示窗口名称和受欢迎程度
时间: 2024-02-06 19:12:22 浏览: 85
假设食堂窗口表中的表名为"CanteenWindow",包含字段"WindowName"和"Popularity",以下是实现对受欢迎程度进行降序排序并在ID为ID_List1的列表中显示窗口名称和受欢迎程度的代码:
```
// 打开数据库连接
m_pConnection->Open("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=test.accdb", "", "", adModeUnknown);
// 执行SQL语句,将窗口按受欢迎程度降序排序
_RecordsetPtr pRs;
pRs.CreateInstance(__uuidof(Recordset));
pRs->Open("SELECT WindowName, Popularity FROM CanteenWindow ORDER BY Popularity DESC", m_pConnection.GetInterfacePtr(), adOpenStatic, adLockReadOnly, adCmdText);
// 清空列表控件
m_List1.ResetContent();
// 将查询结果添加到列表控件中
while (!pRs->adoEOF)
{
CString strWindowName = pRs->Fields->GetItem("WindowName")->Value.bstrVal;
int nPopularity = pRs->Fields->GetItem("Popularity")->Value.intVal;
CString strItem;
strItem.Format("%s - %d", strWindowName, nPopularity);
m_List1.AddString(strItem);
pRs->MoveNext();
}
// 关闭记录集和数据库连接
pRs->Close();
m_pConnection->Close();
```
以上代码使用ADO技术实现对数据库的操作,需要包含头文件`<afxdb.h>`,并且需要将`m_pConnection`声明为`_ConnectionPtr`类型。此外,还需要在资源编辑器中将ID为`ID_List1`的列表控件与变量`m_List1`关联。
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