學說按指數搜索表

Question

我有一個問題，我的剋星：SQL/DQL 我有一個實體：樣式和實體投票。樣式可以有很多投票（如你所想象的），一個投票只與一個樣式鏈接。

我現在想要搜索的投票少於特定金額（這是用戶輸入，但假設它是5）的樣式。這是我與QueryBuilder的

$qb = $this->createQueryBuilder('s'); 
$qb 
    ->select("s") 
    ->join('s.votes', 'v') 
    ->addSelect("COUNT(v.id) as voteCount") 
    ->where("voteCount < ?1") 
    ->orderBy('voteCount', "DESC") 
    ->setMaxResults(3) 
    ->setFirstResult(0) 
    ->groupBy('s.id') 
    ->setParameter(1, 5); 

$query = $qb->getQuery(); 
$result = $query->getResult(); 

使用一次，我嘗試執行查詢的代碼，它基本上說，我voteCount未在where子句中已知的。這是確切的錯誤信息

An exception occurred while executing 'SELECT s0_.active AS active0, s0_.views AS views1, s0_.description AS description2, s0_.name AS name3, s0_.id AS id4, s0_.updated AS updated5, s0_.created AS created6, COUNT(v1_.id) AS sclr7, s0_.battle_id AS battle_id8, s0_.user_id AS user_id9, s0_.voucher_id AS voucher_id10 FROM Style s0_ INNER JOIN Vote v1_ ON s0_.id = v1_.style_id WHERE sclr7 < ? GROUP BY s0_.id ORDER BY sclr7 DESC LIMIT 3 OFFSET 0' with params [1]:

SQLSTATE[42S22]: Column not found: 1054 Unknown column 'sclr7' in 'where clause'

我做錯了什麼？我如何搜索vor voteCount？

Answer 1

集合函數的條件，例如sum和count應放在having子句中。

$qb = $this->createQueryBuilder('s'); 
$qb->select("s"); 
$qb->join('s.votes', 'v'); 
$qb->addSelect("COUNT(v.id) as voteCount"); 
$qb->orderBy('voteCount', "DESC"); 
$qb->setMaxResults(3); 
$qb->setFirstResult(0); 
$qb->groupBy('s.id'); 
$qb->having("count(v.id) < ?1"); //changed from where 
$qb->setParameter(1, 5); 
$query = $qb->getQuery(); 
$result = $query->getResult(); 

Answer 2

您不能在WHERE子句中引用列別名。

變化

$qb->where("voteCount < ?1"); 

要

$qb->where("COUNT(v.id) < ?1");