c_fetch.c

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/*!
 * \file db/dbmi_client/c_fetch.c
 *
 * \brief DBMI Library (client) - fetch data
 *
 * SPDX-FileCopyrightText: 1999-2008 GRASS Development Team
 * SPDX-License-Identifier: GPL-2.0-or-later
 *
 * \author Joel Jones (CERL/UIUC), Radim Blazek
 */
 
#include <grass/dbmi.h>
#include "macros.h"
 
/*!
   \brief Fetch data from open cursor
 
   \param cursor pointer to dbCursor
   \param position cursor position
   \param[out] more get more (0 for no data to be fetched)
 
   \return DB_OK on success
   \return DB_FAILED on failure
 */
int db_fetch(dbCursor *cursor, int position, int *more)
{
    int ret_code;
 
    /* start the procedure call */
    db__set_protocol_fds(cursor->driver->send, cursor->driver->recv);
    DB_START_PROCEDURE_CALL(DB_PROC_FETCH);
 
    /* send the argument(s) to the procedure */
    DB_SEND_TOKEN(&cursor->token);
    DB_SEND_INT(position);
 
    /* get the return code for the procedure call */
    DB_RECV_RETURN_CODE(&ret_code);
 
    if (ret_code != DB_OK)
        return ret_code; /* ret_code SHOULD == DB_FAILED */
 
    /* get the results */
    DB_RECV_INT(more);
    if (*more) {
        DB_RECV_TABLE_DATA(cursor->table);
    }
    return DB_OK;
}