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我想準備PDO語句並將結果轉換爲PHP中的JSON。我設法通過下面的方法來連接數據庫:爲PDO連接準備簡單查詢
class DB_CONNECT {
function __construct() {
$this->connect();
}
function __destruct() {
$this->close();
}
function connect() {
$root = getenv("DOCUMENT_ROOT");
require_once ($root.'/db/db_config.php');
try
{
$db = new PDO('mysql:host='.DB_SERVER.';dbname='.DB_DATABASE.';charset=utf8;port='.DB_PORT, DB_USER, DB_PASSWORD);
$db->setAttribute(PDO::ATTR_EMULATE_PREPARES, false);
$db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
echo 'OK';
return $db;
}
catch (PDOException $e)
{
print "Connection error!: " . $e->getMessage() . "<br/>";
die();
}
}
function close() {
$db = null;
}
PHP,我在那裏發表聲明如下:
$root = getenv("DOCUMENT_ROOT");
require_once ($root.'/db/db_connect.php');
$db = new DB_CONNECT();
$statement=$db->prepare("SELECT name, surname FROM lecturer");
$statement->execute();
$results=$statement->fetchAll(PDO::FETCH_ASSOC);
echo json_encode($results);
當我運行這個PHP,我只得到確定消息,該連接成功。那個查詢代碼有什麼問題?