internal NpgsqlTransaction(NpgsqlConnection conn, IsolationLevel isolationLevel = DefaultIsolationLevel)
{
Debug.Assert(conn != null);
Debug.Assert(isolationLevel != IsolationLevel.Chaos);
Connection = conn;
_connector = Connection.CheckReadyAndGetConnector();
Log.Debug($"Beginning transaction with isolation level {isolationLevel}", _connector.Id);
_connector.Transaction = this;
_connector.TransactionStatus = TransactionStatus.Pending;
switch (isolationLevel)
{
case IsolationLevel.RepeatableRead:
case IsolationLevel.Snapshot:
_connector.PrependInternalMessage(PregeneratedMessage.BeginTrans);
_connector.PrependInternalMessage(PregeneratedMessage.SetTransRepeatableRead);
break;
case IsolationLevel.Serializable:
_connector.PrependInternalMessage(PregeneratedMessage.BeginTrans);
_connector.PrependInternalMessage(PregeneratedMessage.SetTransSerializable);
break;
case IsolationLevel.ReadUncommitted:
// PG doesn't really support ReadUncommitted, it's the same as ReadCommitted. But we still
// send as if.
_connector.PrependInternalMessage(PregeneratedMessage.BeginTrans);
_connector.PrependInternalMessage(PregeneratedMessage.SetTransReadUncommitted);
break;
case IsolationLevel.ReadCommitted:
_connector.PrependInternalMessage(PregeneratedMessage.BeginTrans);
_connector.PrependInternalMessage(PregeneratedMessage.SetTransReadCommitted);
break;
case IsolationLevel.Unspecified:
isolationLevel = DefaultIsolationLevel;
goto case DefaultIsolationLevel;
default:
throw new NotSupportedException("Isolation level not supported: " + isolationLevel);
}
_isolationLevel = isolationLevel;
}