codeigniter count_all_results

Question

I'm working with the latest codeIgniter released, and i'm also working with jquery datatables from datatables.net

I've written this function: https://gist.github.com/4478424 which, as is works fine. Except when I filter by using the text box typing something in. The filter itself happens, but my count is completely off.

I tried to add in $res = $this->db->count_all_results() before my get, and it stops the get from working at all. What I need to accomplish, if ($data['sSearch'] != '') then to utilize the entire query without the limit to see how many total rows with the search filter exists.

If you need to see any other code other than whats in my gist, just ask and I will go ahead and post it.

Answer 1

Count first with no_reset_flag.

$this->db->count_all_results('', FALSE);
$rows = $this->db->get()->result_array();

---

system/database/DB_query_builder.php

public function count_all_results($table = '', $reset = TRUE) { ... }

Answer 2

$this->db->count_all_results() replaces $this->db->get() in a database call.

I.E. you can call either count_all_results() or get(), but not both.

You need to do two seperate active record calls. One to assign the results #, and one to get the actual results.

Something like this for the count:

$this->db->select('id');
$this->db->from('table');
$this->db->where($your_conditions);
$num_results = $this->db->count_all_results();

And for the actual query (which you should already have):

$this->db->select($your_columns);
$this->db->from('table');
$this->db->where($your_conditions);
$this->db->limit($limit);
$query = $this->db->get();

Answer 3

Have you read up on https://www.codeigniter.com/userguide2/database/active_record.html#caching ?

I see you are trying to do some pagination where you need the "real" total results and at the same time limiting.

This is my practice in most of my codes I do in CI.

    $this->db->start_cache();

    // All your conditions without limit
    $this->db->from();
    $this->db->where(); // and etc...
    $this->db->stop_cache();

    $total_rows = $this->db->count_all_results(); // This will get the real total rows

    // Limit the rows now so to return per page result
    $this->db->limit($per_page, $offset);
    $result = $this->db->get();

    return array(
        'total_rows' => $total_rows,
        'result'     => $result,
    ); // Return this back to the controller.

I typed the codes above without testing but it should work something like this. I do this in all of my projects.

Answer 4

You dont actually have to have the from either, you can include the table name in the count_all_results like so.

$this->db->count_all_results('table_name');

Answer 5

The

$this->db->count_all_results();

actually replaces the:

$this->db->get();

So you can't actually have both.

If you want to do have both get and to calculate the num rows at the same query you can easily do this:

$this->db->from(....);
$this->db->where(....);
$db_results = $this->get();

$results = $db_results->result();
$num_rows = $db_results->num_rows();