Kohana 3.2 Call to undefined method Database_MySQL_Result::offset() - database

Question

That happens when I try to play around with DB::select instead of ORM.
The query is returned as an object, but the error appears.
Code:
$bd_userdata -> offset($pagination -> offset) -> limit($pagination -> items_per_page) -> find_all() -> as_array();
Error:
ErrorException [ Fatal Error ]: Call to undefined method Database_MySQL_Result::offset()
Does it mean I have to count rows, before I send them to the offset in pagination?
When I try $query->count_all() I get the error message:
Undefined property: Database_Query_Builder_Select::$count_all
I tried count($query) but instead I got:
No tables used [ SELECT * LIMIT 4 OFFSET 0 ]
Here is the solution:
$results = DB::select('*')
->from('users')
->where('id', '=', 1)
->limit($pagination->items_per_page)
->offset($pagination->offset)->execute();
And a counter:
$count = $results->count_all();
I was doing it before, the other way around. That is why it did not work.

Answer 1

As you can see, execute() returns Database_Result object, which has no QBuilder's functionality. You must apply all conditions (where, limit, offset etc) before calling execute.
Here is a simple example with pagination:
// dont forget to apply reset(FALSE)!
$query = DB::select()->from('users')->where('username', '=', 'test')->reset(FALSE);
// counting rows
$row_count = $query->count_all();
// create pagination
$pagination = Pagination::factory(array(
'items_per_page' => 4,
'total_items' => $row_count,
));
// select rows using pagination's limit&offset
$users = $query->offset($pagination->offset)->limit($pagination->items_per_page)->execute();