Mega Code Archive
Using Transactions
<![CDATA[
#include "stdafx.h"
using namespace System;
using namespace System::Data;
using namespace System::Data::OleDb;
ref struct MyEventHandler
{
static void RowUpdated(Object^ sender, OleDbRowUpdatedEventArgs^ e)
{
if ( e->Status == UpdateStatus::ErrorsOccurred )
throw "Row update failed!";
}
};
void main()
{
OleDbConnection^ myConnection = nullptr;
OleDbTransaction^ myTransaction = nullptr;
try
{
myConnection = gcnew OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=Music.mdb");
myConnection->Open();
OleDbDataAdapter^ dataAdapter = gcnew OleDbDataAdapter("SELECT * FROM Music", myConnection);
OleDbCommandBuilder^ commandBuilder = gcnew OleDbCommandBuilder(dataAdapter);
dataAdapter->UpdateCommand = commandBuilder->GetUpdateCommand();
dataAdapter->RowUpdated += gcnew OleDbRowUpdatedEventHandler(MyEventHandler::RowUpdated);
DataSet^ myDataSet = gcnew DataSet();
dataAdapter->MissingSchemaAction = MissingSchemaAction::AddWithKey;
dataAdapter->Fill(myDataSet);
myTransaction = myConnection->BeginTransaction();
DataTable^ myTable = myDataSet->Tables[0];
DataRow^ row = myTable->Rows->Find("Automatic");
if ( row != nullptr )
row["Title"] = "Automatic (Dance Mix)";
row = myTable->Rows->Find("EnTrance");
if ( row != nullptr )
row["GenreName"] = "Trance";
dataAdapter->Update(myDataSet);
myTransaction->Commit();
}
catch(Exception^ e)
{
Console::WriteLine(e->Message);
if ( myTransaction != nullptr )
{
myTransaction->Rollback();
Console::WriteLine("Transaction rolled back.");
}
}
finally
{
myConnection->Close();
}
}
]]>