Show number of factories behind categories in sidebar. codeigniter

问题

I have a sidebar with categories. when i click on one categorie it shows me the factories who are located in that category.

I did this using joins in codeigniter.

Now i want to show how much factories are in a category. so for example:

Categories.

Cars (2)
Books (7)
Animals (45)

So it simple has to show how much factories have that specific category.

i tried to do a simple count_all_results but then i get the total count of factories. but i want them to count by the specific id of categories.

my model function:

function categorieen_getall($segment3)
{
    $this->db->where('categorieen.idcategorieen', $segment3);
    $this->db->select('*');
    $this->db->from('bedrijfcategorieen');
    $this->db->join('categorieen', 'categorieen.idcategorieen = bedrijfcategorieen.idcategorieen');
    $this->db->join('bedrijven', 'bedrijven.idbedrijven = bedrijfcategorieen.idbedrijven');
    $query = $this->db->get();
    $result = $query->result();
    /*
    echo '<pre>';
    print_r($result);
    */
    return $result;
}

My controller function:

    function get_All()
    {
        $data['cat'] = $this->categorieen_model->categorieen_getall($segment3);
        $this->load->view('views/sidebar', $data);
    }

My view:

    <div id="sidebar">
    <?php
    echo '<h3>Categorieën</h3>';
    echo ($this->db->count_all_results('categorieen')); 

    ?>

        <hr>
        <br/>
        <?php
        echo '<ul>';
        if(isset($cat) && is_array($cat)){
            foreach($links as $k => $value){

                echo '<li>';
                echo '<br>';
                echo '<a href="'.base_url().'home/categorie/'.$value->idcategorieen.' ">' .$value->Categorie. '</a>';
                echo '</li>';

            }
        }
        echo '<ul>';
        /*
        if(isset($cat ) && is_array($cat )){
            foreach($cat as $key => $row){
                echo "Categorie:"; echo $row->Categorie;
                echo "<br />";
                echo $row->idcategorieen;
                echo "<br />";
                echo $row->Bedrijfsnaam;
            }
        }
        */
        ?>
</div>

My database scheme:

Factories
--------
idfactories
factoryname
adress
email
...

Categories
----------
idcategories
Category


Factorycategories
-----------------
idfactorycategories
idcategories
idfactories

回答1:

This is not quite suitable because I know there is a better way to do this, but this will do the work for you:

// Get categories
$categories = array();

$query = $this->db->query("select * from `Categories` order by `idcategories`");

if($query->num_rows() > 0)
{
  foreach($query->result_array() as $row)
  {
    $query_count = $this->db->query("select `idfactorycategories` from `Factorycategories` where `idcategories` = {$row['idcategories']}");
    $factory_count = $query_count->num_rows();

    $categories[] = array(
      'count' => $factory_count 
    );
  }
}

For ease, you can first get categories in a foreach loop and then for each of them submit a query for the factories table to get relevant count of factories with that related category id.