案例在学说查询生成器中不起作用，其中子句

Question

我面临着mysql CASE的问题，其中原则条款，

 $rides_q1 = $em->getRepository('IRRideBundle:Ride');
    $query = $rides_q1->createQueryBuilder('a')
                     ->where('(CASE WHEN a.ephemeral = 1 THEN a.date_beginning < NOW() AND a.date_ending > NOW()ELSE a.ephemeral = 0 END) AND a.active = 1 AND a.status = 5')                  
     ->getQuery();
$ridesQuery = $query->execute();

**[Syntax Error] line 0, col 93: Error: Expected DoctrineORMQueryLexer::T_ELSE, got '<'**
[2/2] QueryException: [Syntax Error] line 0, col 93: Error: Expected DoctrineORMQueryLexer::T_ELSE, got '<'   +
[1/2] QueryException: SELECT a FROM IRRideBundleEntityRide a WHERE (CASE WHEN ephemeral = 1 THEN date_beginning < NOW() AND date_ending > NOW()ELSE ephemeral = 0 END) 

我想准备这个sql查询，它与phpmyadmin一起工作得很好

SELECT * FROM ride WHERE (CASE WHEN ephemeral = 1 THEN date_beginning < NOW() AND date_ending > NOW()ELSE ephemeral = 0 END) AND active = 1 AND `status_id` = 5 ORDER BY `date_ending` DESC

Answer 1

您在WHERE中的CASE表达式是错误的。您可以将其转换为正常的复合条件，例如

(CASE WHEN a.ephemeral = 1 THEN a.date_beginning < NOW() AND a.date_ending > NOW()ELSE a.ephemeral = 0 END)

自

SELECT * FROM ride
WHERE ((a.ephemeral = 1 
       and a.date_beginning < NOW() 
       AND a.date_ending > NOW()) 
  OR a.ephemeral = 0)
  AND a.active = 1 
  AND a.status = 5
ORDER BY `date_ending` DESC

Answer 2

方法createQueryBuilder()当你需要用原则构建查询时使用。例如：

 public function findPostsQuery()
  {
      $qb = $this->createQueryBuilder('p');
      $qb
          ->where('p.postStatus = :postStatus')
          ->orderBy('p.id', 'DESC')
          ->setParameter('postStatus', true);
      return $qb->getQuery();
  } 

如果不创建自定义查询 - 请使用createQuery()方法。例如：

 $em = $this->getDoctrine()->getManager();
 $query = $em->createQuery(
     'SELECT p
     FROM AppBundle:Product p
     WHERE p.price > :price
     ORDER BY p.price ASC'
 )->setParameter('price', 19.99);
 $products = $query->getResult();

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