1 files changed, 61 insertions, 0 deletions

diff --git a/src/include/gnunet_db_lib.h b/src/include/gnunet_db_lib.h
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+++ b/src/include/gnunet_db_lib.h
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+/*
+  This file is part of GNUnet
+  Copyright (C) 2017 GNUnet e.V.
+
+  GNUnet is free software; you can redistribute it and/or modify it under the
+  terms of the GNU General Public License as published by the Free Software
+  Foundation; either version 3, or (at your option) any later version.
+
+  GNUnet is distributed in the hope that it will be useful, but WITHOUT ANY
+  WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+  A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License along with
+  GNUnet; see the file COPYING.  If not, If not, see <http://www.gnu.org/licenses/>
+*/
+/**
+ * @file include/gnunet_db_lib.h
+ * @brief shared defintions for transactional databases
+ * @author Christian Grothoff
+ */
+#ifndef GNUNET_DB_LIB_H
+#define GNUNET_DB_LIB_H
+
+
+/**
+ * Status code returned from functions running database commands.
+ * Can be combined with a function that returns the number
+ * of results, so all non-negative values indicate success.
+ */
+enum GNUNET_DB_QueryStatus
+{
+  /**
+   * A hard error occurred, retrying will not help.
+   */
+  GNUNET_DB_STATUS_HARD_ERROR = -2,
+
+  /**
+   * A soft error occurred, retrying the transaction may succeed.
+   * Includes DEADLOCKS and SERIALIZATION errors.
+   */
+  GNUNET_DB_STATUS_SOFT_ERROR = -1,
+
+  /**
+   * The transaction succeeded, but yielded zero results.
+   * May include the case where an INSERT failed with UNIQUE
+   * violation (i.e. row already exists) or where DELETE
+   * failed to remove anything (i.e. nothing matched).
+   */
+  GNUNET_DB_STATUS_SUCCESS_NO_RESULTS = 0,
+
+  /**
+   * The transaction succeeded, and yielded one result.
+   */
+  GNUNET_DB_STATUS_SUCCESS_ONE_RESULT = 1
+
+  /* Larger values may be returned for SELECT statements
+     that returned more than one result. */
+
+};
+
+#endif