PHP/PDO：查询请求工作，准备好的请求不工作'；T

我想使用PDO创建用户准备的请求，但它似乎不会返回任何结果，而查询请求确实会返回一些结果

在这里，我有两个要求：

准备好的请求：

$req = $this->bdd->prepare('SELECT u.id, u.username, hm.desc, s.name AS shop, hm.amount, hm.date FROM history_members AS hm LEFT JOIN users AS u ON u.id = hm.user_id LEFT JOIN shops AS s ON s.id = hm.shop_id WHERE hm.user_id = :id');
$req->bindValue(':id', $id, PDO::PARAM_INT);
$data = $req->fetchAll(PDO::FETCH_ASSOC);
$req->closeCursor();

$req = $this->bdd->query('SELECT u.id, u.username, hm.desc, s.name AS shop, hm.amount, hm.date FROM history_members AS hm LEFT JOIN users AS u ON u.id = hm.user_id LEFT JOIN shops AS s ON s.id = hm.shop_id WHERE hm.user_id = '.$id);
$data = $req->fetchAll(PDO::FETCH_ASSOC);
$req->closeCursor();

查询请求：

$req = $this->bdd->prepare('SELECT u.id, u.username, hm.desc, s.name AS shop, hm.amount, hm.date FROM history_members AS hm LEFT JOIN users AS u ON u.id = hm.user_id LEFT JOIN shops AS s ON s.id = hm.shop_id WHERE hm.user_id = :id');
$req->bindValue(':id', $id, PDO::PARAM_INT);
$data = $req->fetchAll(PDO::FETCH_ASSOC);
$req->closeCursor();

$req = $this->bdd->query('SELECT u.id, u.username, hm.desc, s.name AS shop, hm.amount, hm.date FROM history_members AS hm LEFT JOIN users AS u ON u.id = hm.user_id LEFT JOIN shops AS s ON s.id = hm.shop_id WHERE hm.user_id = '.$id);
$data = $req->fetchAll(PDO::FETCH_ASSOC);
$req->closeCursor();

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准备好的请求有什么问题吗？

您没有执行查询。

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首先执行查询，然后获取结果。

@Petitkoalak如果解决了您的问题，请接受这个答案。@itsols:我必须等待10分钟