PDO =＆gt; ＆＃39; PDOException＆＃39;消息＆＃39; SQLSTATE [HY093]：参数号无效：参数未定义＆＃39;

Question

我正在尝试在我的PDO中运行子查询，但PDO不会拥有它。有什么建议？

带有消息'SQLSTATE [HY093]的未捕获异常'PDOException'：参数号无效：参数未定义'

$userId = 1;
$promotionId = 1;

$sql = "
    SELECT 
        *, 
        ( 
            SELECT 
                COUNT(*) 
            FROM 
                promotion_user as spu 
            WHERE 
                spu.promotion_id = p.id AND 
                spu.user_id = :user_id 
        ) as num_uses 
    FROM 
        promotion as p 
    WHERE 
        p.id = :promotionId
";

//$db is the PDO connection
$getPromotions = $db->prepare($sql);
$getPromotions->bindValue(':user_id', $userId, PDO::PARAM_STR);
$getPromotions->bindValue(':promotion_id', $promotionId, PDO::PARAM_STR);
$getPromotions->execute();
$promotions = $getPromotions->fetchAll(PDO::FETCH_ASSOC);

Answer 1

在您的查询中写道：

:promotionId

当您绑定参数时，您写道：

$getPromotions->bindValue(':promotion_id', $promotionId, PDO::PARAM_STR);

你需要以相同的方式写，promotionId！= promotion_id。

所以你应该改变这一行：

p.id = :promotionId

对此：

p.id = :promotion_id