select all and some attribute from a table get different result in codeigniter

Question

I've try to get result from sql query in codeigniter with mode select all attribute but it returns a PHP error but when I specify some attribute in give the right answer but the query is too long to be written.

This 2 mode select that I've try and give different result.

First

class model_kemiskinan extends CI_Model {

..... //constructor here

function get_kemiskinan_provinsi(){
    $this->tahun = "2011";
    $this->kodeProv = "31";        
    $this->query = "select * from kemiskinan where id_provinsi = ".$this->kodeProv." and tahun = ".$this->tahun;        
    $this->result = $this->db->query($this->query);                
    return $this->result->result();
}

Then the controlller pass it

public function testquery(){        
    $this->load->model('model_kemiskinan');                
    $data['hasil'] = $this->model_kemiskinan->get_kemiskinan_provinsi();        
    $data['main_content'] = 'test';        
    $this->load->view('template', $data);       
}

and the view 'test' respond it with these code:

if(is_array($hasil)){        
    foreach ($hasil as $baris ) {            
        echo $baris->tahun;
        echo $baris->id_provinsi;            
        echo "<br/>";
    }

And the result is this

A PHP Error was encountered 
Severity: Notice 
Message: Undefined property: stdClass::$tahun

Second

But if I change the select mode that look like this :

$this->query = "select tahun, id_provinsi from kemiskinan where id_provinsi = ".$this->kodeProv." and tahun = ".$this->tahun;        

It will work properly

Is there any solution about select all mode?

-Thanks before-

Answer 1

like the documentation ( http://ellislab.com/codeigniter/user-guide/database/examples.html ) says:

$query = $this->db->query('SELECT name, title, email FROM my_table');

foreach ($query->result() as $row)
{
    echo $row->title;
    echo $row->name;
    echo $row->email;
}

echo 'Total Results: ' . $query->num_rows();

you get only one row by calling result() so you need to call it by foreach:

function get_kemiskinan_provinsi(){
    $this->tahun = "2011";
    $this->kodeProv = "31";        
    $this->query = "select * from kemiskinan where id_provinsi = ".$this->kodeProv." and tahun = ".$this->tahun;        
    $this->result = $this->db->query($this->query); 

    $res = array();             
    foreach ($this->result->result() as $row)
    {
        $res[] = $row;
    }
    return $res;
}

Please recognize that the fields in the result object are case sensitive! If you have a field named "Tahun" in your db then "select tahun ..." will work in mysql and will give you an object where you can access $res->tahun.

If you do "select * ...." then you can only access it like this: $res->Tahun (with capial T)