pg_count_known_coins.c (2189B)
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/pg_count_known_coins.c 18 * @brief Implementation of the count_known_coins function for Postgres 19 * @author Christian Grothoff 20 */ 21 #include "taler/platform.h" 22 #include "taler/taler_error_codes.h" 23 #include "taler/taler_dbevents.h" 24 #include "taler/taler_pq_lib.h" 25 #include "pg_count_known_coins.h" 26 #include "pg_helper.h" 27 28 long long 29 TEH_PG_count_known_coins (void *cls, 30 const struct 31 TALER_DenominationHashP *denom_pub_hash) 32 { 33 struct PostgresClosure *pg = cls; 34 uint64_t count; 35 struct GNUNET_PQ_QueryParam params[] = { 36 GNUNET_PQ_query_param_auto_from_type (denom_pub_hash), 37 GNUNET_PQ_query_param_end 38 }; 39 struct GNUNET_PQ_ResultSpec rs[] = { 40 GNUNET_PQ_result_spec_uint64 ("count", 41 &count), 42 GNUNET_PQ_result_spec_end 43 }; 44 enum GNUNET_DB_QueryStatus qs; 45 46 47 PREPARE (pg, 48 "count_known_coins", 49 "SELECT" 50 " COUNT(*) AS count" 51 " FROM known_coins" 52 " WHERE denominations_serial=" 53 " (SELECT denominations_serial" 54 " FROM denominations" 55 " WHERE denom_pub_hash=$1);"); 56 qs = GNUNET_PQ_eval_prepared_singleton_select (pg->conn, 57 "count_known_coins", 58 params, 59 rs); 60 if (0 > qs) 61 return (long long) qs; 62 return (long long) count; 63 }