133 lines
3.3 KiB
C
133 lines
3.3 KiB
C
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/*
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This file is part of TALER
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(C) 2014 Christian Grothoff (and other contributing authors)
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TALER is free software; you can redistribute it and/or modify it under the
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terms of the GNU General Public License as published by the Free Software
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Foundation; either version 3, or (at your option) any later version.
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TALER is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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TALER; see the file COPYING. If not, If not, see <http://www.gnu.org/licenses/>
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*/
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/**
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* @file include/taler_db_lib.h
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* @brief helper functions for DB interactions
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* @author Sree Harsha Totakura <sreeharsha@totakura.in>
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* @author Florian Dold
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*/
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#ifndef TALER_DB_LIB_H_
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#define TALER_DB_LIB_H_
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#include <libpq-fe.h>
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#include "taler_util.h"
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#define TALER_DB_QUERY_PARAM_END { NULL, 0, 0 }
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#define TALER_DB_QUERY_PARAM_PTR(x) { (x), sizeof (*(x)), 1 }
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#define TALER_DB_QUERY_PARAM_PTR_SIZED(x, s) { (x), (s), 1 }
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#define TALER_DB_RESULT_SPEC_END { NULL, 0, NULL }
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#define TALER_DB_RESULT_SPEC(name, dst) { (void *) (dst), sizeof (*(dst)), (name) }
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#define TALER_DB_RESULT_SPEC_SIZED(name, dst, s) { (void *) (dst), (s), (name) }
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/**
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* Description of a DB query parameter.
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*/
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struct TALER_DB_QueryParam
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{
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/**
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* Data or NULL
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*/
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const void *data;
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/**
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* Size of 'data'
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*/
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size_t size;
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/**
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* Non-null if this is not the last parameter.
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* This allows for null as sentinal value.
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*/
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int more;
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};
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/**
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* Description of a DB result cell.
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*/
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struct TALER_DB_ResultSpec
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{
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/**
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* Destination for the data.
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*/
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void *dst;
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/**
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* Allowed size for the data.
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*/
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size_t dst_size;
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/**
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* Field name of the desired result.
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*/
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char *fname;
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};
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/**
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* Execute a prepared statement.
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*/
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PGresult *
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TALER_DB_exec_prepared (PGconn *db_conn,
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const char *name,
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const struct TALER_DB_QueryParam *params);
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/**
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* Extract results from a query result according to the given specification.
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* If colums are NULL, the destination is not modified, and GNUNET_NO
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* is returned.
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*
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* @return
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* GNUNET_YES if all results could be extracted
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* GNUNET_NO if at least one result was NULL
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* GNUNET_SYSERR if a result was invalid (non-existing field)
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*/
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int
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TALER_DB_extract_result (PGresult *result, struct TALER_DB_ResultSpec *rs, int row);
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int
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TALER_DB_field_isnull (PGresult *result,
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int row,
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const char *fname);
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int
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TALER_DB_extract_amount_nbo (PGresult *result,
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int row,
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const char *val_name,
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const char *frac_name,
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const char *curr_name,
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struct TALER_AmountNBO *r_amount_nbo);
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int
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TALER_DB_extract_amount (PGresult *result,
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int row,
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const char *val_name,
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const char *frac_name,
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const char *curr_name,
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struct TALER_Amount *r_amount);
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#endif /* TALER_DB_LIB_H_ */
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/* end of include/taler_db_lib.h */
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