小编sim*_*imm的帖子

今天我尝试了一些更复杂的MySQL查询,我注意到MySQL的LEFT JOIN不能与WHERE子句一起使用.我的意思是,它确实会返回一些记录,但它不会返回右侧为空的记录.

例如,假设我们需要表格:

albums                                   ; albums_rap
  id artist        title         tracks  ;    id artist    title           rank
---- -------- ---------- --------------- ;  ---- --------- ----- --------------
   1 John Doe     Mix CD              20 ;     3 Mark      CD #7            15
   2 Mark          CD #7              35 ;

当我运行此查询时:

SELECT 
    t1.artist as artist,
    t1.title as title,
    t1.tracks as tracks,
    t2.rank as rank,
FROM
    albums as t1
LEFT JOIN
    albums_rap as t2
ON 
    t1.artist LIKE t2.artist
AND
    t1.title LIKE t2.title
WHERE
    t2.rank != 17

我明白了:

artist title …

我有注射从RabbitMQ的生产问题RabbitMqBundle到我的服务。

服务：

namespace App\Service;

use Carbon\Carbon;
use Doctrine\ORM\EntityManagerInterface;
use OldSound\RabbitMqBundle\RabbitMq\ProducerInterface;

class RatingPositionRecalculateService
{

    protected $entityManager;

    protected $positionProducer;

    public function __construct(EntityManagerInterface $entityManager, ProducerInterface $producer)
    {
        $this->entityManager = $entityManager;
        $this->positionProducer = $producer;
    }

    public function recalculate(Carbon $day)
    {
        // do stuff
    }

}

old_sound_rabbit_mq.yml：

old_sound_rabbit_mq:
    connections:
        default:
            url: ''

    producers:
        rating_position:
            connection:       default
            exchange_options: { name: 'rating_position', type: direct }

    consumers:
        rating_position:
            connection:       default
            exchange_options: {name: 'rating_position', type: direct}
            queue_options:    {name: 'rating_position'}
            callback:         rating_position_service

我得到：

Cannot autowire service "App\Service\RatingPositionRecalculateService": argument …