多連接查詢生成器doctrine2

Question

public function search($params) 
    { 
     $qb = $this->createQueryBuilder('auto'); 
     if (isset($params['manufacturer'])) { 
      $qb->join('auto.manufacturer', 'man') 
      ->where('man.manufacturer = :manufacturer') 
      ->setParameter('manufacturer', $params['manufacturer']); 
     } 
     if (isset($params['model'])) { 
      $qb->join('auto.model', 'mod') 
       ->where('mod.model = :model') 
       ->setParameter('model', $params['model']); 
     } 

     return $qb->getQuery()->getResult(); 
    } 

查詢返回錯誤：

Invalid parameter number: number of bound variables does not match number of tokens

Answer 1

更換where與andWhere功能。因爲當你有2個參數時，你首先替換where條件，在第二個條件和結果中你只有一個標記有2個綁定參數。