Question

I’m doing the following queries in codeigniter and can’t figure out how to get the second query to work. How do I get an array of just the values from my first query and use that in my second?

function application()
{
    $user_id = $this->tank_auth->get_user_id();
    $this->db->select('app_id')->from('using')->where('user_id' , $user_id);
    $query = $this->db->get();

    $row = $query->result_array();

    if ($query->num_rows() > 0) :
    $this->db->select('app_name')->from('applications')->where('id' , $row['app_id']);
    $body['query'] = $this->db->get();
    endif;

    $this->load->view('apps_view', $body);

If I comment out the second query and var_dump($row);
it gives me:
array(2) { [0]=> array(1) { [“app_id”]=> string(1) “2” } [1]=> array(1) { [“app_id”]=> string(1) “3” } }

I decided to do multiple queries instead of a join because I will be adding additional columns to select from the second query.

Thanks for the help.

Answer 1

Are you expecting the first query to return just one row?

If so then you should use:

$query = $this->db->get();

$row = $query->row();

$app_id = $row->app_id;
//etc

It’s not clear from your question.

If your first query returns (or can return) multiple rows, then you need to do this:

$query = $this->db->get();

if ($query->num_rows() > 0) :
    foreach($query->result_array() as $row)
    {
        $this->db->select('app_name')
                 ->from('applications')
                 ->where('id' , $row['app_id']);
    }

    $body['query'] = $this->db->get();
endif;
// etc

you very may well need to adjust the code as I’m not sure what your desired result is. Do you see the difference?

If you return result_array you have an array of results (fancy that!) – hence why your var_dump has [0]=> array(1) etc – there is an array for each row returned.

If you are only wanting/expecting to return one result from the first query, you should use row instead.

Hope this makes sense – should be a push in the right direction.

edit
In fact this might be the correct syntax:

$query = $this->db->get();

if ($query->num_rows() > 0) :
    $this->db->select('app_name')->from('applications');
    foreach($query->result_array() as $row)
    {
        $this->db->where('id' , $row['app_id']);
        // build the `where...` string with iteration/result/row
    }

    $body['query'] = $this->db->get(); // now we get the data.
endif;
// etc