Deal with Hierarchal ResultSet : OleDbDataReader « Database ADO.net « Visual C++ .NET

Deal with Hierarchal ResultSet

 
#include "stdafx.h"
using namespace System;
using namespace System::Data;
using namespace System::Data::OleDb;

void TraverseReader(OleDbDataReader^ Reader){
    while ( Reader->Read() )
        for ( int i = 0; i < Reader->FieldCount; i++ ){
            Object^ Value = Reader->GetValue(i);
            if ( Value->GetType() == OleDbDataReader::typeid )
                TraverseReader(static_cast<OleDbDataReader^>(Value));
            Console::Write(gcnew String(' ', Reader->Depth*2));
            Console::WriteLine("{0} ({1}):\t{2}", Reader->GetName(i),Reader->GetDataTypeName(i), Value);
        }
}
void main(){
    OleDbConnection^ myConnection = nullptr;
    
    myConnection = gcnew OleDbConnection("Provider=MSDataShape;Data Provider=Microsoft.Jet.OLEDB.4.0;Data Source=Music.mdb");        
    myConnection->Open();
        
    OleDbCommand^ myCommand = gcnew OleDbCommand(
            "SHAPE {SELECT Name, Description FROM Genre}\
            APPEND ({SELECT GenreName, Title, Duration FROM Music}\
            AS MusicByGenre\
            RELATE Name TO GenreName)",
            myConnection);
    TraverseReader(myCommand->ExecuteReader());
    myConnection->Close();
}

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