title: Fatal error: Call to undefined method CI_DB_mysql_driver::group_start()
body: <p>I developing codeigniter php web application. There are I got error like this:</p>
  
  <blockquote>
    <p>Fatal error: Call to undefined method CI_DB_mysql_driver::group_start() in C:\wamp\www\ci_sock\application\models\customer_m.php on line 31</p>
  </blockquote>
  
  <p><a href="https://i.stack.imgur.com/J7F1q.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/J7F1q.png" alt="enter image description here"></a> </p>
  
  <p>How to solve this. There are my <code>PHP</code> code below:</p>
  
  <pre><code>foreach ($this-&gt;column_search as $item) // loop column 
      {
          if($_POST['search']['value']) // if datatable send POST for search
          {
  
              if($i===0) // first loop
              {
                  $this-&gt;db-&gt;group_start(); // open bracket. query Where with OR clause better with bracket. because maybe can combine with other WHERE with AND.
                  $this-&gt;db-&gt;like($item, $_POST['search']['value']);
              }
              else
              {
                  $this-&gt;db-&gt;or_like($item, $_POST['search']['value']);
              }
  
              if(count($this-&gt;column_search) - 1 == $i) //last loop
                  $this-&gt;db-&gt;group_end(); //close bracket
          }
          $i++;
      }
  </code></pre>
  
  <p>There are 31 line <code>$this-&gt;db-&gt;group_start();</code> like this.</p>
  
  <p>Please help me solve this.</p>