更新数据库后，如何检索该记录？[关闭]

问：

我有一个更新记录的 php 文件，但我如何检索该记录。

<?php

include("config.php");

ini_set('display_errors', 'On');
error_reporting(E_ALL);

$executionStartTime = microtime(true);
header('Content-Type: application/json; charset=UTF-8');

$conn = new mysqli($cd_host, $cd_user, $cd_password, $cd_dbname, $cd_port, $cd_socket);

if (mysqli_connect_errno()) {
    
    $output['status']['code'] = "300";
    $output['status']['name'] = "failure";
    $output['status']['description'] = "database unavailable";
    $output['status']['returnedIn'] = (microtime(true) - $executionStartTime) / 1000 . " ms";
    $output['data'] = [];

    mysqli_close($conn);

    echo json_encode($output);

    exit;
}   

$stmt = $conn->prepare("UPDATE personnel SET firstName = ?, lastName = ?, email = ?, jobTitle = ?, departmentID = ? WHERE id=?");
$stmt->bind_param("ssssii", $_REQUEST['firstName'],$_REQUEST['lastName'],$_REQUEST['emailAddress'],$_REQUEST['jobTitle'],$_REQUEST['departmentID'],$_REQUEST['id']);
$stmt->execute();

$stmt = $conn->prepare("SELECT * FROM `personnel` WHERE `id` = ?");
$stmt->bind_param("i",$_REQUEST['id']);
$stmt->execute();
$result = $stmt->get_result();
echo json_encode($result);
?>

显示记录后，我得到{}，为什么会这样，任何帮助将不胜感激。