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3 Copyright (C) 2017 GNUnet e.V.
5 GNUnet is free software: you can redistribute it and/or modify it
6 under the terms of the GNU Affero General Public License as published
7 by the Free Software Foundation, either version 3 of the License,
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11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Affero General Public License for more details.
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16 along with this program. If not, see <http://www.gnu.org/licenses/>.
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21 * @file include/gnunet_db_lib.h
22 * @brief shared defintions for transactional databases
23 * @author Christian Grothoff
25 #ifndef GNUNET_DB_LIB_H
26 #define GNUNET_DB_LIB_H
30 * Status code returned from functions running database commands.
31 * Can be combined with a function that returns the number
32 * of results, so all non-negative values indicate success.
34 enum GNUNET_DB_QueryStatus
37 * A hard error occurred, retrying will not help.
39 GNUNET_DB_STATUS_HARD_ERROR = -2,
42 * A soft error occurred, retrying the transaction may succeed.
43 * Includes DEADLOCKS and SERIALIZATION errors.
45 GNUNET_DB_STATUS_SOFT_ERROR = -1,
48 * The transaction succeeded, but yielded zero results.
49 * May include the case where an INSERT failed with UNIQUE
50 * violation (i.e. row already exists) or where DELETE
51 * failed to remove anything (i.e. nothing matched).
53 GNUNET_DB_STATUS_SUCCESS_NO_RESULTS = 0,
56 * The transaction succeeded, and yielded one result.
58 GNUNET_DB_STATUS_SUCCESS_ONE_RESULT = 1
60 /* Larger values may be returned for SELECT statements
61 that returned more than one result. */