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/*
This file is part of GNUnet
Copyright (C) 2017 GNUnet e.V.
GNUnet 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.
GNUnet 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
GNUnet; see the file COPYING. If not, If not, see <http://www.gnu.org/licenses/>
*/
/**
* @file sq/sq.c
* @brief helper functions for Sqlite3 DB interactions
* @author Christian Grothoff
*/
#include "platform.h"
#include "gnunet_sq_lib.h"
/**
* Execute a prepared statement.
*
* @param db_conn database connection
* @param params parameters to the statement
* @return #GNUNET_OK on success, #GNUNET_SYSERR on error
*/
int
GNUNET_SQ_bind (sqlite3_stmt *stmt,
const struct GNUNET_SQ_QueryParam *params)
{
unsigned int j;
j = 1;
for (unsigned int i=0;NULL != params[i].conv; i++)
{
if (GNUNET_OK !=
params[i].conv (params[i].conv_cls,
params[i].data,
params[i].size,
stmt,
j))
{
GNUNET_log_from (GNUNET_ERROR_TYPE_WARNING,
"sq",
_("Failure to bind %u-th SQL parameter\n"),
i);
if (SQLITE_OK !=
sqlite3_reset (stmt))
{
GNUNET_log_from (GNUNET_ERROR_TYPE_WARNING,
"sq",
_("Failure in sqlite3_reset (!)\n"));
return GNUNET_SYSERR;
}
}
GNUNET_assert (0 != params[i].num_params);
j += params[i].num_params;
}
return GNUNET_OK;
}
/**
* Extract results from a query result according to the given specification.
*
* @param result result to process
* @param[in,out] rs result specification to extract for
* @return
* #GNUNET_OK if all results could be extracted
* #GNUNET_SYSERR if a result was invalid (non-existing field)
*/
int
GNUNET_SQ_extract_result (sqlite3_stmt *result,
struct GNUNET_SQ_ResultSpec *rs)
{
unsigned int j = 0;
for (unsigned int i=0;NULL != rs[i].conv; i++)
{
if (NULL == rs[i].result_size)
rs[i].result_size = &rs[i].dst_size;
if (GNUNET_OK !=
rs[i].conv (rs[i].cls,
result,
j,
rs[i].result_size,
rs[i].dst))
{
for (unsigned int k=0;k<i;k++)
if (NULL != rs[k].cleaner)
rs[k].cleaner (rs[k].cls);
return GNUNET_SYSERR;
}
GNUNET_assert (0 != rs[i].num_params);
j += rs[i].num_params;
}
return GNUNET_OK;
}
/**
* Free all memory that was allocated in @a rs during
* #GNUNET_SQ_extract_result().
*
* @param rs reult specification to clean up
*/
void
GNUNET_SQ_cleanup_result (struct GNUNET_SQ_ResultSpec *rs)
{
for (unsigned int i=0;NULL != rs[i].conv; i++)
if (NULL != rs[i].cleaner)
rs[i].cleaner (rs[i].cls);
}
/**
* Reset @a stmt and log error.
*
* @param dbh database handle
* @param stmt statement to reset
*/
void
GNUNET_SQ_reset (sqlite3 *dbh,
sqlite3_stmt *stmt)
{
if (SQLITE_OK !=
sqlite3_reset (stmt))
GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
"sqlite",
_("Failed to reset sqlite statement with error: %s\n"),
sqlite3_errmsg (dbh));
}
/* end of sq.c */
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