Question

我想要转换为使用PDO代替mysql_的查询：

$checkLikes = $sdb->query(sprintf("SELECT * FROM `likes`,`users`
                                  WHERE `likes`.`by` = `users`.`idu` 
                                  AND `likes`.`by` IN (%s) 
                                  ORDER BY `id` DESC 
                                  LIMIT %s", $subscriptions, 25));

以上查询使用MySQL来执行。我正在尝试将其转换为PDO：

$checkLikes = $sdb->prepare("SELECT * FROM `likes`,`users` 
                             WHERE `likes`.`by` = `users`.`idu` 
                             AND `likes`.`by` IN :subscriptions 
                             ORDER BY `id` DESC 
                             LIMIT :subscriptions", $subscriptions, 25);
$checkLikes->bindParam(":subscriptions",$subscriptions);
$checkLikes->execute();

上面的代码不起作用，因为我收到了这些错误：

Warning: PDO::prepare() expects at most 2 parameters, 3 given in /home/user/public_html/header.php on line 411

Fatal error: Call to a member function bindParam() on a non-object in /home/user/public_html/header.php on line 412

我做错了什么？我使用bindParam()将变量绑定到PDO查询。我无法看到错误。

Answer 1

首先删除要发送到->prepare语句的第二个和第三个参数，因为只需要查询：

$checkLikes = $sdb->prepare("SELECT * FROM `likes`,`users` WHERE `likes`.`by` = `users`.`idu` AND `likes`.`by` IN (:subscriptions) ORDER BY `id` DESC LIMIT :subscriptions_limit");

然后绑定两个参数并执行查询：

$checkLikes->bindParam(":subscriptions",$subscriptions, PDO::PARAM_STR);
$subscription_limit = 25;
$checkLikes->bindParam(":subscriptions_limit",$subscription_limit, PDO::PARAM_INT);
$checkLikes->execute();

由于您使用的是IN，因此您还应该确保$subscriptions是数组值的string表示，而不是array中的bindParam() }

将MySQL转换为PDO - 查询

1 个答案: