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

Answer 1

If your queries contain a group by, using count_all_results fails. I wrote a simple method to work around this. The key to preventing writing your queries twice is to put them all inside a private method that can be called twice. Here is some sample code:

class Report extends CI_Model {
    ...
    public function get($page=0){
        $this->_complex_query();
        $this->db->limit($this->results_per_page, $page*$this->results_per_page);
        $sales = $this->db->get()->result(); //no table needed in get()

        $this->_complex_query();
        $num_results = $this->_count_results();

        $num_pages = ceil($num_results/$this->results_per_page);

        //return data to your controller
    }

    private function _complex_query(){
        $this->db->where('a', $value);
        $this->db->join('(subquery) as s', 's.id = table.s_id');
        $this->db->group_by('table.column_a');

        $this->db->from('table'); //crucial - we specify all tables here
    }

    private function _count_results(){
        $query = $this->db->get_compiled_select();
        $count_query = "SELECT count(*) as num_rows FROM (".$query.") count_wrap";
        $r = $this->db->query($count_query)->row();
        return $r->num_rows;
    }
}

Answer 2

Try this

 /**
        * @param $column_name   :   Use In Choosing Column name
        * @param $where         :   Use In Condition Statement
        * @param $table_name    :   Name of Database Table
        * Description           :   Count all results   
        */ 
    function count_all_results($column_name = array(),$where=array(), $table_name = array())
    {
        $this->db->select($column_name);
        // If Where is not NULL
        if(!empty($where) && count($where) > 0 )
        {
            $this->db->where($where);
        }
        // Return Count Column
        return $this->db->count_all_results($table_name[0]);//table_name array sub 0
    }

Then Simple Call the Method

Like this

$this->my_model->count_all_results(['column_name'],['where'],['table name']);

Answer 3

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();

Answer 4

$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 5

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 6

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');