上再選擇

我試圖用這個查詢Symfony2的教義SQL對象映射： MySQL SELECT DISTINCT by highest value 上再選擇

SELECT 
    p.* 
FROM  
     product p 
    INNER JOIN 
     (SELECT 
       magazine, MAX(onSale) AS latest 
      FROM 
       product 
      GROUP BY 
       magazine 
     ) AS groupedp 
     ON groupedp.magazine = p.magazine 
     AND groupedp.latest = p.onSale ;

在Symfony2中和DQL。

我：

$query = $em->createQuery("SELECT p FROM MyBundle:Product p WHERE p.type = 'magazine' AND p.maglink IS NOT NULL OR (p.type = 'magazine' AND p.diglink IS NOT NULL) GROUP BY p.magazine ORDER BY p.onSale DESC");

與正常工作和輸出對象，但沒有正確的MAX(onSale)

這樣做：返回

$query = $em->createQuery("SELECT p , MAX(p.onSale) FROM MyBundle:Product p WHERE p.type = 'magazine' AND p.maglink IS NOT NULL OR (p.type = 'magazine' AND p.diglink IS NOT NULL) GROUP BY p.magazine ORDER BY p.onSale DESC");

結果非的對象。

此：

$query = $em->createQuery("SELECT 
      p.* 
      FROM 
      MyBundle:Product p 
      INNER JOIN 
      (SELECT 
        p.magazine, MAX(onSale) AS p.latest 
        FROM 
        MyBundle:Product p 
        GROUP BY 
        p.magazine 
      ) AS groupedp 
      ON groupedp.magazine = p.magazine 
      AND groupedp.latest = p.onSale ;");

拋出這個錯誤： [語義錯誤] 0行，列127鄰近 'SELECT '：錯誤：標識變量（用於聯接路徑表達但在此之前並沒有定義

我承擔因該Symfony2 Doctrine query

我如何保持我的映射，同時仍然能夠通過Onsale的每個項目進行排序？

來源

2012-07-23 BobFlemming