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/*!
* \file db/dbmi_driver/d_fetch.c
*
* \brief DBMI Library (driver) - fetch data
*
* (C) 1999-2008 by the GRASS Development Team
*
* This program is free software under the GNU General Public
* License (>=v2). Read the file COPYING that comes with GRASS
* for details.
*
* \author Joel Jones (CERL/UIUC), Radim Blazek
*/
#include <grass/dbmi.h>
#include "macros.h"
#include "dbstubs.h"
static int valid_cursor(dbCursor *cursor, int position);
/*!
\brief Fetch data
\return DB_OK on success
\return DB_FAILED on failure
*/
int db_d_fetch(void)
{
dbToken token;
dbCursor *cursor;
int stat;
int more;
int position;
/* get the arg(s) */
DB_RECV_TOKEN(&token);
DB_RECV_INT(&position);
cursor = (dbCursor *)db_find_token(token);
if (!valid_cursor(cursor, position)) {
DB_SEND_FAILURE();
return DB_FAILED;
}
/* call the procedure */
stat = db_driver_fetch(cursor, position, &more);
/* send the return code */
if (stat != DB_OK) {
DB_SEND_FAILURE();
return DB_OK;
}
DB_SEND_SUCCESS();
/* results */
DB_SEND_INT(more);
if (more) {
DB_SEND_TABLE_DATA(cursor->table);
}
return DB_OK;
}
static int valid_cursor(dbCursor *cursor, int position)
{
if (cursor == NULL)
return 0;
if (!db_test_cursor_type_fetch(cursor)) {
db_error("not a fetchable cursor");
return 0;
}
if (position != DB_NEXT && !db_test_cursor_mode_scroll(cursor)) {
db_error("not a scrollable cursor");
return 0;
}
return 1;
}
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