C++ (Cpp) __wt_row_random 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: bt_curnext.c Project: RolfAndreassen/wiredtiger

/*
 * __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;

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

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

	WT_RET(__cursor_func_init(cbt, 1));

	/*
	 * Only supports row-store: applications can trivially select a random
	 * value from a column-store, if there were any reason to do so.
	 */
	WT_ERR(btree->type == BTREE_ROW ?
	    __wt_row_random(session, cbt) : ENOTSUP);
	ret = cbt->compare == 0 ?
	    __wt_kv_return(session, cbt) : WT_NOTFOUND;

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