protected override Common.DbTransaction BeginDbTransaction(IsolationLevel isolationLevel)
{
if (state == ConnectionState.Closed)
{
throw new InvalidOperationException("The connection is not open.");
}
if (transaction != null)
{
throw new InvalidOperationException("OracleConnection does not support parallel transactions.");
}
OciTransactionHandle transactionHandle = oci.CreateTransaction();
if (transactionHandle == null)
{
throw new Exception("Error: Unable to start transaction");
}
else
{
transactionHandle.Begin();
transaction = new OracleTransaction(this, isolationLevel, transactionHandle);
}
return(transaction);
}