Question

I need help with validation error in database.

I have a model :

 function total ($id_student, $id_course){
         $query = $this->db->query('select total from student where id_student='.$id_student. ' and $id_course='.$id_course);
        if ($query->num_rows() <= 0) {
            return false;

        }
        if ($query->num_rows() > 0) {
            $row = $query->row();
            return $row->total;
        }
     }

I have this code in the controller:

$id_course=array;
 $total = array();
        for ($i = 0; $i < count($list_courses); $i++) {            
            $total[$i] = $this->student_model->total($id_student, $id_course[$i]);
            $error[$i]= $this->db->_error_message();
          if(!empty($error[$i])){
                    $total[$i] = 0;                    
                }
        }

The parameters $id_student and $id_course can exist in the database or no. I need that if the query gives error or the query not exists, skip the error, do $total[$i]=0 and don’t show the error database and continue the loop. I don’t know how can I do this. I have tried many options in the forums, but I couldn’t. Thanks for your help. I’m sorry my english.

Answer 1

In your model method, you’re returning false if the query doesn’t produce a result. So you can do this:

$id_course=array;
$total = array();
for ($i = 0; $i < count($list_courses); $i++) {   

    // if query returns false, then $total[$i] will be false         
    $total[$i] = $this->student_model->total($id_student, $id_course[$i]);
    $error[$i]= $this->db->_error_message();

    // check if $total[$i] is empty/false, if so make it 0
    if(empty($total[$i])){
        $total[$i] = 0;                    
    }
}