我有两个表的联接。实际上，在我插入之前，代码和获取工作正常：
$id=isset($_GET['id']) ? $_GET['id'] : die('ERROR: Record ID not found.');
和
WHERE id = ? LIMIT 0,1";
但是现在即使只有两行，它也只获取第一行：
<head>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
</head>
<?php
$id=isset($_GET['id']) ? $_GET['id'] : die('ERROR: Record ID not found.');
try {
require "config.php";
require "common.php";
$connection = DbConnect();
$sql = "SELECT * FROM product
LEFT JOIN brand
ON product.id = brand.product_id
WHERE id = ? LIMIT 0,1";
$statement = $connection->prepare($sql);
$statement->bindParam(1, $id);
$statement->execute();
$result = $statement->fetchAll(PDO::FETCH_ASSOC);
} catch(PDOException $error) {
echo $sql . "<br>" . $error->getMessage();
}
?>
<?php require "public/templates/header.php"; ?>
<h2>Update </h2>
<form action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"] . "?id={$id}");?>" method="post">
<table>
<thead>
<tr>
<th>id</th>
<th>product name</th>
<th>date</th>
<th>brand name</th>
<th>brand location</th>
</tr>
</thead>
<tbody>
<?php foreach ($result as $row) : ?>
<tr>
<td><?php echo escape($row["id"]); ?></td>
<td><?php echo escape($row["product_name"]); ?></td>
<td><?php echo escape($row["date"]); ?></td>
<td><?php echo escape($row["brand_name"]); ?></td>
<td><?php echo escape($row["brand_location"]); ?></td>
<td><a href="entry_update.php?id=<?php echo escape($row["id"]); ?>">Select</a></td>
</tr>
<?php endforeach; ?>
</tbody>
</table>
</form>
<a href="index.php">Back to home</a>
<?php require "public/templates/footer.php"; ?>
我使用了fetchAll和foreach循环，所以我不明白为什么它只提取第一行。也许有人可以帮忙，谢谢！
您在这里的错误：
$sql = "SELECT * FROM product LEFT JOIN brand ON product.id = brand.product_id WHERE id = ? LIMIT 0,1";
您使用限制上下文，它将返回上一行。尝试将限制0,1更改为限制10。