ADO 操作Access数据库问题
这段代码是按学号搜索一条记录的,有没有好的方法判断学号不存在啊?
_ParameterPtr m_pParameter,pParam1;
HRESULT hr;
hr=m_pCommand.CreateInstance(__uuidof(Command));
hr=m_pParameter.CreateInstance(__uuidof(Parameter));
m_pCommand->ActiveConnection=m_pConnection;
m_pCommand->CommandText="SELECT * FROM studentinfo WHERE stuNo=?";
pParam1=m_pCommand->CreateParameter("",adBSTR,adParamInput,sizeof(_bstr_t),(char *)_bstr_t(m_stuNo1));
hr=m_pCommand->Parameters->Append(pParam1);
m_pRecordset=m_pCommand->Execute(NULL,NULL,adCmdText);