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Update Database button

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I'm trying to make a button that will update the database when clicked. But it isn't working..
Is there someone who can help me?  Shy
VIEW:

  <form method="GET" action="<?php $this->load->library('TestModel'); ?>">
   <input type="submit" onclick="getVervers();" name="ververs" value="Update DB" />
    <?php if (isset($_GET['ververs']))  { echo "Laatst bijgewerkt op: " . date("h:i A"); } else { 
     echo "Klik op 'Update DB' om de hele database bij te werken. "; } ?> <br><br>
    </form>

MODEL:

public function getVervers() {


    if (isset($_GET['ververs'])) {
     $query = $this->db->set("UPDATE * FROM project");
     

  

    } else
    {
        return '<script language="javascript">';
        return 'alert("Er is een fout bij het bijwerken van de database opgetreden.")';
        return '</script>'; } 
    } 

CONTROLLER:

$this->load->database(); 
$this->load->model('TestModel');

$ververs = array(
'ververs' => $this->TestModel->getVervers(),
);

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