C++ (Cpp) __wt_btcur_search_near Examples

Example #1

File: bt_cursor.c Project: 3rf/mongo

/*
 * __wt_btcur_next_random --
 *	Move to a random record in the tree.
 */
int
__wt_btcur_next_random(WT_CURSOR_BTREE *cbt)
{
	WT_BTREE *btree;
	WT_DECL_RET;
	WT_SESSION_IMPL *session;
	WT_UPDATE *upd;

	session = (WT_SESSION_IMPL *)cbt->iface.session;
	btree = cbt->btree;

	/*
	 * Only supports row-store: applications can trivially select a random
	 * value from a column-store, if there were any reason to do so.
	 */
	if (btree->type != BTREE_ROW)
		WT_RET(ENOTSUP);

	WT_STAT_FAST_CONN_INCR(session, cursor_next);
	WT_STAT_FAST_DATA_INCR(session, cursor_next);

	WT_RET(__cursor_func_init(cbt, 1));

	WT_ERR(__wt_row_random(session, cbt));
	if (__cursor_valid(cbt, &upd))
		WT_ERR(__wt_kv_return(session, cbt, upd));
	else
		WT_ERR(__wt_btcur_search_near(cbt, 0));

err:	if (ret != 0)
		WT_TRET(__cursor_reset(cbt));
	return (ret);
}

Example #2

File: cur_file.c Project: zhliu03/wiredtiger

/*
 * __curfile_search_near --
 *	WT_CURSOR->search_near method for the btree cursor type.
 */
static int
__curfile_search_near(WT_CURSOR *cursor, int *exact)
{
	WT_CURSOR_BTREE *cbt;
	WT_DECL_RET;
	WT_SESSION_IMPL *session;

	cbt = (WT_CURSOR_BTREE *)cursor;
	CURSOR_API_CALL(cursor, session, search_near, cbt->btree);
	WT_CURSOR_NEEDKEY(cursor);
	ret = __wt_btcur_search_near(cbt, exact);
err:	API_END(session);

	return (ret);
}

Example #3

File: cur_file.c Project: qihsh/mongo

/*
 * __curfile_search_near --
 *	WT_CURSOR->search_near method for the btree cursor type.
 */
static int
__curfile_search_near(WT_CURSOR *cursor, int *exact)
{
	WT_CURSOR_BTREE *cbt;
	WT_DECL_RET;
	WT_SESSION_IMPL *session;

	cbt = (WT_CURSOR_BTREE *)cursor;
	CURSOR_API_CALL(cursor, session, search_near, cbt->btree);

	WT_CURSOR_NEEDKEY(cursor);
	WT_CURSOR_NOVALUE(cursor);

	WT_BTREE_CURSOR_SAVE_AND_RESTORE(
	    cursor, __wt_btcur_search_near(cbt, exact), ret);

err:	API_END_RET(session, ret);
}

Example #4

File: cur_file.c Project: mpobrien/mongo

/*
 * __curfile_search_near --
 *	WT_CURSOR->search_near method for the btree cursor type.
 */
static int
__curfile_search_near(WT_CURSOR *cursor, int *exact)
{
	WT_CURSOR_BTREE *cbt;
	WT_DECL_RET;
	WT_SESSION_IMPL *session;

	cbt = (WT_CURSOR_BTREE *)cursor;
	CURSOR_API_CALL(cursor, session, search_near, cbt->btree);
	WT_ERR(__cursor_checkkey(cursor));

	WT_ERR(__wt_btcur_search_near(cbt, exact));

	/* Search-near maintains a position, key and value. */
	WT_ASSERT(session,
	    F_MASK(cursor, WT_CURSTD_KEY_SET) == WT_CURSTD_KEY_INT &&
	    F_MASK(cursor, WT_CURSTD_VALUE_SET) == WT_CURSTD_VALUE_INT);

err:	API_END_RET(session, ret);
}