php - PDO 捕获 PDOException 错误

Question

如果连接有效，它工作得很好，但如果连接失败，PDOException 似乎实际上不起作用。捕获完全无法执行。如果失败，它会中断此行 $this->dbh = new PDO("$db_driver:host=$db_host;dbname=$db_name", $db_user, $db_pass); 的执行。所以我无法在 catch block 中获取 PDOException。我如何让它继续工作？

<?php

namespace app\Helpers;

use \PDO;

/**
* Core class which exists only once through the application
*
*/
class Core
{
public $dbh; // handle of the db connexion
private static $instance;

// constructor to create a MySQLi instance (="MySQL Improved Extension")
private function __construct()
{

    $db_host = ConfigHelper::read('db.host');
    $db_name = ConfigHelper::read('db.basename');
    $db_user = ConfigHelper::read('db.user');
    $db_pass = ConfigHelper::read('db.password');
    $db_driver = ConfigHelper::read('db.driver');
    try {
        $this->dbh = new PDO("$db_driver:host=$db_host;dbname=$db_name", $db_user, $db_pass);
    } catch (PDOException $pdoex) {
        exit("Database connection failed: " . $pdoex->getMessage());
        return false;
    }

}
/**
 * get instance of Core object
 *
 * @return Object self
 */
public static function getInstance()
{
    if (!isset(self::$instance)) {
        $object = __CLASS__;
        self::$instance = new $object;
    }
    return self::$instance;
}

}

Answer 1

这是一个命名空间问题。

在命名空间中时，您必须通过在其前面加上反斜杠来寻址每个根级类名。

但你没有。

但最糟糕的是您根本不应该捕获 PDOException。就leave it alone and let it report to a site-wide report handler