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我有讀取一個功能。該函數將從類別表中只讀取一條記錄,並將值分配給名稱和描述變量。它看起來像這樣:顯示從數據庫中選擇的記錄
require_once('../config/Database.php');
class Category {
private $conn;
private $id;
private $name;
private $description;
private $created;
public function __construct($db) {
$this->conn = $db;
}
public function readOne($id) {
$stmt = $this->conn->prepare('SELECT name, description FROM categories WHERE id = "'.$id.'"');
$stmt->execute();
$result = $stmt->fetch(PDO::FETCH_ASSOC);
$this->name = $result['name'];
$this->description = $result['description'];
}
我試圖把這種用這樣的:
<?php
if($_SERVER['REQUEST_METHOD'] == 'POST'){
if (isset($_POST['read'], $_POST['id'])) {
$cat = new Category($conn);
$id = filter_input (INPUT_POST , 'id', FILTER_SANITIZE_NUMBER_INT);
echo $cat->readOne($id);
}}
?>
<div>
<h3>readOne():</h3>
<form action="" method="post">
<label>Category id :</label>
<input type="text" name="id" id="id" required="required" placeholder="Please Enter Id"/><br /><br />
<input type="submit" value="read" name="read"/><br />
</div>
我沒有得到任何錯誤,而且我寫的類ID,然後按後沒什麼happends按鈕,如何解決它?
連接到數據庫:
<?php
class Database {
public function getConnection() {
$result = false;
try {
$result = new PDO('mysql:host=localhost;dbname=demo', 'root', '');
} catch(PDOException $e) { }
return $result;
}
}
$db = new Database();
$conn = $db->getConnection();
if (!$conn) {
die("Error connecting to the database");
}
?>
您正在迴應readOne的返回值,但沒有返回語句,因此它始終爲空 – cske