count_known_coins.c (2127B)
1 /* 2 This file is part of TALER 3 Copyright (C) 2022 Taler Systems SA 4 5 TALER is free software; you can redistribute it and/or modify it under the 6 terms of the GNU General Public License as published by the Free Software 7 Foundation; either version 3, or (at your option) any later version. 8 9 TALER is distributed in the hope that it will be useful, but WITHOUT ANY 10 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR 11 A PARTICULAR PURPOSE. See the GNU General Public License for more details. 12 13 You should have received a copy of the GNU General Public License along with 14 TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/> 15 */ 16 /** 17 * @file exchangedb/count_known_coins.c 18 * @brief Implementation of the count_known_coins function for Postgres 19 * @author Christian Grothoff 20 */ 21 #include "taler/taler_pq_lib.h" 22 #include "exchange-database/count_known_coins.h" 23 #include "helper.h" 24 25 long long 26 TALER_EXCHANGEDB_count_known_coins (struct TALER_EXCHANGEDB_PostgresContext *pg, 27 const struct 28 TALER_DenominationHashP *denom_pub_hash) 29 { 30 uint64_t count; 31 struct GNUNET_PQ_QueryParam params[] = { 32 GNUNET_PQ_query_param_auto_from_type (denom_pub_hash), 33 GNUNET_PQ_query_param_end 34 }; 35 struct GNUNET_PQ_ResultSpec rs[] = { 36 GNUNET_PQ_result_spec_uint64 ("count", 37 &count), 38 GNUNET_PQ_result_spec_end 39 }; 40 enum GNUNET_DB_QueryStatus qs; 41 42 43 PREPARE (pg, 44 "count_known_coins", 45 "SELECT" 46 " COUNT(*) AS count" 47 " FROM known_coins" 48 " WHERE denominations_serial=" 49 " (SELECT denominations_serial" 50 " FROM denominations" 51 " WHERE denom_pub_hash=$1);"); 52 qs = GNUNET_PQ_eval_prepared_singleton_select (pg->conn, 53 "count_known_coins", 54 params, 55 rs); 56 if (0 > qs) 57 return (long long) qs; 58 return (long long) count; 59 }