If you need to export as a CSV file a model that you already have in your database, you can do the following in your code:

• Add a method exportCSV in your Controller: application/controller/MyController.php
  
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  Class MyController extends CI_Controller {       public function __construct() {         parent::__construct();           // Load database         $this->load->model('MyModel');     }       public function exportCSV(){         // get data         $myData = $this->MyModel->getData();           // file name         $filename = 'mydata_'.date('Ymd').'.csv';         header("Content-Description: File Transfer");         header("Content-Disposition: attachment; filename=$filename");         header("Content-Type: application/csv; ");           // file creation         $file = fopen('php://output', 'w');           $header = array("Column 1","Column 2","Column 3","Column 4");         fputcsv($file, $header);           foreach ($myData as $line){             fputcsv($file,array($line->field1,$line->field2,$line->field3,$line->field4));         }           fclose($file);         exit;     } }

• In the preferred view, add the following export link:
  
  1	<a href='<?= base_url() ?>/myController/exportCSV'>Export</a>