使用PDO循环更新多行数据-PHP中文网问答

我有一个可检索多行数据的表单，每个项目都有一个文本区域，供用户对特定项目发表评论。返回的项目数量是可变的，并且他们不必在任何/所有框中留下评论。

<textarea name="comment[]" cols="25" rows="2"><?php echo $f2; ?></textarea>
    <input name="tableid[]" type="hidden" value="<?php echo $f1; ?>">

echo 语句用当前存储在数据库中的任何内容填充文本区域，因为用户可以修改其他人输入的内容。

当它被传递到表单处理页面时，它会返回这个..

Submit: Submit
    comment: Test Comment 1,Test Comment 2
    tableid: 590,591

所以它似乎正确地传递了数组。我正在使用此代码来更新数据库

$conn = new PDO("mysql:host=xxxx;dbname=xxxxx",$username,$password);

$i = 0;
if(isset($_POST['submit'])) {
    foreach($_POST['comment'] as $comment) {
                        $comment = $_POST['comment'][$i];

            $id = $_POST['tableid'][$i];
            $stmt = $conn->prepare("UPDATE reservations SET comment=:comment WHERE     tableid=:id");

            $stmt->bindValue(':comment', $comment, PDO::PARAM_INT);
            $stmt->bindValue(':id', $id, PDO::PARAM_INT);

            $stmt->execute();

            $i++;
    }
}

但是，这似乎根本没有更新，我哪里出错了？

非常感谢

$conn = new PDO("mysql:host=xxxx;dbname=xxxxx", $username, $password, [ PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION, //Set PDO to fire PDOExceptions on errors. PDO::ATTR_EMULATE_PREPARES => false //Disable emulated prepares. Solves some minor edge cases. ]); //No need for incrementer. The index of the comment should be enough. if (isset($_POST['submit'])) { //Note the prepare on the outside. $stmt = $conn->prepare("UPDATE `reservations` SET `comment` = :comment WHERE `tableid` = :id"); //As well as the binding. By using bindParam, and supplying a variable, we're passing it by reference. //So whenever it changes, we don't need to bind again. $stmt->bindParam(":comment", $comment, PDO::PARAM_STR); $stmt->bindParam(":id", $id, PDO::PARAM_INT); foreach ($_POST['comment'] as $index => $comment) { //All that's left is to set the ID, see how we're reusing the $index of the comment input? $id = $_POST['tableid'][$index]; $stmt->execute(); } }

<textarea name="comment[<?=$f1?>]" cols="25" rows="2"><?=$f2?></textarea> <?php $dsn = "mysql:host=xxxx;dbname=xxxxx"; $opt = array( PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION, PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC ); $conn = new PDO($dsn, $username, $password, $opt); $sql = "UPDATE reservations SET comment=? WHERE tableid= ?"; $stmt = $conn->prepare($sql); foreach ($_POST["comment"] as $id => $comment) { if ($comment) { $stmt->execute([$comment, $id]); } }