/// <summary>
/// Cancels and terminates an ongoing operation. Any data already written will be discarded.
/// </summary>
public void Cancel()
{
CheckDisposed();
if (CanWrite)
{
_isDisposed = true;
_writeBuf.EndCopyMode();
_writeBuf.Clear();
_connector.SendMessage(new CopyFailMessage());
try
{
var msg = _connector.ReadMessage();
// The CopyFail should immediately trigger an exception from the read above.
_connector.Break();
throw new NpgsqlException("Expected ErrorResponse when cancelling COPY but got: " + msg.Code);
}
catch (PostgresException e)
{
if (e.SqlState == "57014")
{
return;
}
throw;
}
}
else
{
_connector.CancelRequest();
}
}
/// <summary>
/// Commits the import operation. The writer is unusable after this operation.
/// </summary>
public void Commit()
{
CheckReady();
if (InMiddleOfRow)
{
Cancel();
throw new InvalidOperationException("Binary importer closed in the middle of a row, cancelling import.");
}
try
{
WriteTrailer();
_buf.Flush();
_buf.EndCopyMode();
_connector.SendMessage(CopyDoneMessage.Instance);
_connector.ReadExpecting <CommandCompleteMessage>();
_connector.ReadExpecting <ReadyForQueryMessage>();
_state = ImporterState.Committed;
}
catch
{
// An exception here will have already broken the connection etc.
Cleanup();
throw;
}
}
