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/*
This file is part of TALER
(C) 2014 Christian Grothoff (and other contributing authors)
TALER 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.
TALER 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
TALER; see the file COPYING. If not, If not, see <http://www.gnu.org/licenses/>
*/
/**
* @file include/taler_db_lib.h
* @brief helper functions for DB interactions
* @author Sree Harsha Totakura <sreeharsha@totakura.in>
* @author Florian Dold
*/
#ifndef TALER_DB_LIB_H_
#define TALER_DB_LIB_H_
#include <libpq-fe.h>
#include "taler_util.h"
#define TALER_DB_QUERY_PARAM_END { NULL, 0, 0 }
#define TALER_DB_QUERY_PARAM_PTR(x) { (x), sizeof (*(x)), 1 }
#define TALER_DB_QUERY_PARAM_PTR_SIZED(x, s) { (x), (s), 1 }
#define TALER_DB_RESULT_SPEC_END { NULL, 0, NULL }
#define TALER_DB_RESULT_SPEC(name, dst) { (void *) (dst), sizeof (*(dst)), (name) }
#define TALER_DB_RESULT_SPEC_SIZED(name, dst, s) { (void *) (dst), (s), (name) }
/**
* Description of a DB query parameter.
*/
struct TALER_DB_QueryParam
{
/**
* Data or NULL
*/
const void *data;
/**
* Size of 'data'
*/
size_t size;
/**
* Non-null if this is not the last parameter.
* This allows for null as sentinal value.
*/
int more;
};
/**
* Description of a DB result cell.
*/
struct TALER_DB_ResultSpec
{
/**
* Destination for the data.
*/
void *dst;
/**
* Allowed size for the data.
*/
size_t dst_size;
/**
* Field name of the desired result.
*/
char *fname;
};
/**
* Execute a prepared statement.
*/
PGresult *
TALER_DB_exec_prepared (PGconn *db_conn,
const char *name,
const struct TALER_DB_QueryParam *params);
/**
* Extract results from a query result according to the given specification.
* If colums are NULL, the destination is not modified, and GNUNET_NO
* is returned.
*
* @return
* GNUNET_YES if all results could be extracted
* GNUNET_NO if at least one result was NULL
* GNUNET_SYSERR if a result was invalid (non-existing field)
*/
int
TALER_DB_extract_result (PGresult *result, struct TALER_DB_ResultSpec *rs, int row);
int
TALER_DB_field_isnull (PGresult *result,
int row,
const char *fname);
int
TALER_DB_extract_amount_nbo (PGresult *result,
int row,
const char *val_name,
const char *frac_name,
const char *curr_name,
struct TALER_AmountNBO *r_amount_nbo);
int
TALER_DB_extract_amount (PGresult *result,
int row,
const char *val_name,
const char *frac_name,
const char *curr_name,
struct TALER_Amount *r_amount);
#endif /* TALER_DB_LIB_H_ */
/* end of include/taler_db_lib.h */
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