Mixing LEFT JOIN結果MySQL Doctrine

Question

我有一個基於學說的應用程序，我想從兩個單獨的表中選擇行並按創​​建日期排序。我（在某種程度上）實現這種方式現在：

$query = $em->createQueryBuilder() 
    ->from('Embed', 'e') 
    ->select("e") 
    ->leftJoin("User", "u", "WITH", "e.uid=u.id") 
    ->leftJoin("Product", "p", "WITH", "e.pid=p.id") 
    ->where("u.image > 0 OR p.image > 0") 
    ->addOrderBy("u.timeCreated + p.timeCreated", "DESC") 
    ->setMaxResults(28) 
    ->getQuery(); 

我想對於產品和用戶數據進行混合，通過創建日期排序，但排序不正確。我也嘗試使用兩個addOrderBy語句，它們可以正確地爲用戶和產品定購，但將所有用戶放在結果中，而不是混合它們。

編輯：入佛門爵士有正確的方法 - 這裏的工作代碼：

$query = $em->createQueryBuilder() 
    ->from('Embed', 'e') 
    ->select("e") 
    ->leftJoin("User", "u", "WITH", "e.uid=u.id") 
    ->leftJoin("Product", "p", "WITH", "e.pid=p.id") 
    ->addSelect('COALESCE(u.timeCreated, p.timeCreated) as timeCreated') 
    ->where("u.image > 0 OR p.image > 0") 
    ->orderBy("timeCreated", "DESC") 
    ->setMaxResults(28) 
    ->getQuery(); 

Answer 1

你應該試試這個

$query = $em->createQueryBuilder() 
    ->from('Embed', 'e') 
    ->select("e") 
    ->leftJoin("User", "u", "WITH", "e.uid=u.id") 
    ->leftJoin("Product", "p", "WITH", "e.pid=p.id") 
    ->where("u.image > 0 OR p.image > 0") 
    ->addOrderBy("COALESCE(u.timeCreated, p.timeCreated)", "DESC") 
    ->setMaxResults(28) 
    ->getQuery();