public function update(Commission $commission){
$query = $this->_db->prepare(' UPDATE t_commission SET
titre=:titre, commissionnaire=:commissionnaire, montant=:montant,
etat=:etat, updated=:updated, updatedBy=:updatedBy
WHERE id=:id')
or die (print_r($this->_db->errorInfo()));
$query->bindValue(':id', $commission->id());
$query->bindValue(':titre', $commission->titre());
$query->bindValue(':commissionnaire', $commission->commissionnaire());
$query->bindValue(':montant', $commission->montant());
$query->bindValue(':etat', $commission->etat());
$query->bindValue(':updated', $commission->updated());
$query->bindValue(':updatedBy', $commission->updatedBy());
$query->execute();
$query->closeCursor();
}