如何在cakePHP中編寫具有正確聯接的子查詢？

Question

我想在cake php中用sql的正確連接編寫子查詢，查詢如下

SELECT stkid,s.id as stk_id, s.userid as stk_userid,
       s.productid as productid, u.id as userid
FROM (select * FROM stocks as st where st.`productid` = 1) as s
  right join users as u on (u.id = s.userid)
group by u.id

請幫助我，任何幫助或建議將不勝感激

Answer 1

首先，我不得不說您的SQL查詢沒有經過優化：您的FROM子查詢是無用的。

看一看 ：

SELECT 
    stkid, 
    s.id AS stk_id, 
    s.userid AS stk_userid,
    s.productid AS productid, 
    u.id AS userid
FROM stocks AS s 
RIGHT JOIN users AS u 
    ON u.id = s.userid
WHERE s.productid = 1
GROUP BY u.id

---

直接SQL

“我只想要此sql的答案”，簡單的方法是這樣（在控制器中）：

    // get the DB link
$pdo = $this->ModelOfThisController->getDataSource()->getConnection();

$sql = "SELECT 
            stkid, 
            s.id AS stk_id, 
            s.userid AS stk_userid,
            s.productid AS productid, 
            u.id AS userid
        FROM (
            SELECT * 
            FROM stocks AS st 
            WHERE st.`productid` = 1
            ) AS s
        RIGHT JOIN users AS u 
            ON (u.id = s.userid)
        GROUP BY u.id
    ";


$req = $pdo->prepare($sql);
$req->execute(array(
    // ':param1' => $param1,
    // ':param2' => $param2,
    ));

$data = $req->fetch(PDO::FETCH_ASSOC);
    // ...

---

ORM

另一種方法是使用cakePHP ORM，但我認為除了模型的表名之外，您不能將FROM更改為其他任何內容。