public function update(Contrat $contrat)
 {
     $query = $this->_db->prepare('UPDATE t_contrat SET numero=:numero, dateCreation=:dateCreation, 
     prixVente=:prixVente, prixVenteArabe=:prixVenteArabe, avance=:avance, avanceArabe=:avanceArabe, 
     modePaiement=:modePaiement, numeroCheque=:numeroCheque,
     nombreMois=:nombreMois, dureePaiement=:dureePaiement, echeance=:echeance,  
     note=:note, updated=:updated, updatedBy=:updatedBy WHERE id=:id') or die(print_r($this->_db->errorInfo()));
     $query->bindValue(':id', $contrat->id());
     $query->bindValue(':numero', $contrat->numero());
     $query->bindValue(':dateCreation', $contrat->dateCreation());
     $query->bindValue(':prixVente', $contrat->prixVente());
     $query->bindValue(':prixVenteArabe', $contrat->prixVenteArabe());
     $query->bindValue(':avance', $contrat->avance());
     $query->bindValue(':avanceArabe', $contrat->avanceArabe());
     $query->bindValue(':modePaiement', $contrat->modePaiement());
     $query->bindValue(':dureePaiement', $contrat->dureePaiement());
     $query->bindValue(':numeroCheque', $contrat->numeroCheque());
     $query->bindValue(':nombreMois', $contrat->nombreMois());
     $query->bindValue(':echeance', $contrat->echeance());
     $query->bindValue(':note', $contrat->note());
     $query->bindValue(':updated', $contrat->updated());
     $query->bindValue(':updatedBy', $contrat->updatedBy());
     $query->execute();
     $query->closeCursor();
 }