Question

我正在使用ado在我的C ++项目中连接SQL Server。

因此，我想插入/更新数据库，并编写了一些查询（请参见代码），并且试图执行连接或命令。

但是它在pConnection->Execute(InsertQuery, NULL, adCmdUnspecified);处出现错误，显示为Microsoft C++ exception: _com_error at memory location，并且在调试窗口中有_hr，其值为_hr : DB_E_ERRORSINCOMMAND One or more errors occurred during processing of command. TYPE: HRESULT

我也尝试执行Command，但结果与Connection相同。

我应该将adCmdUnspecified更改为某些内容还是在某个地方出错？解决办法是什么？预先谢谢你。

//connections above
VARIANT vNameStringType;

_bstr_t InsertQuery(L"Insert Into TestTB(AccountID, Name) Values(@AccountID, @Name)");

hr = pCommand.CreateInstance(__uuidof(Command));

pCommand->ActiveConnection = pConnection;
pCommand->CommandText = InsertQuery;
pCommand->CommandType = adCmdText;

for (int i = 0; i < size; i++)
{
    a[i].name;
    a[i].login;

    vIntegerType.vt = VT_I4;
    vIntegerType.intVal = a[i].login;
    vNameStringType.vt = VT_BSTR;
    vNameStringType.bstrVal = _bstr_t(a[i].name);

    int DataExistCounter = 0;       

    NameParam = pCommand->CreateParameter(_bstr_t("@Name"), adVarChar, adParamInput, 150, _bstr_t(vNameStringType));
    pCommand->Parameters->Append(NameParam);
    AccIDParam = pCommand->CreateParameter("@AccountID", adInteger, adParamInput, sizeof(int), vIntegerType);
    pCommand->Parameters->Append(AccIDParam);
    pRecordset->MoveFirst();
    while (!pRecordset->EndOfFile)
    {
        valFieldNam = pRecordset->Fields->GetItem("Name")->Value;
        valFieldAcc = pRecordset->Fields->GetItem("AccountID")->Value;
        if (valFieldAcc == a[i].login)
        {
            DataExistCounter++;
        }
        pRecordset->MoveNext();
    }

    if (DataExistCounter > 0)
    {
        //update    
    }
    else
    {
        pConnection->Execute(InsertQuery, NULL, adCmdUnspecified);
    }
}
pRecordset->Close();
pConnection->Close();
CoUninitialize();

如何在C ++中使用ADO修复连接执行错误

0 个答案: