<?php

/**
 * Part of the Joomla Framework Database Package
 *
 * @copyright  Copyright (C) 2005 - 2021 Open Source Matters, Inc. All rights reserved.
 * @license    GNU General Public License version 2 or later; see LICENSE
 */

namespace Joomla\Database\Pdo;

use Joomla\Database\DatabaseQuery;

/**
 * PDO Query Building Class.
 *
 * @since  1.0
 */
abstract class PdoQuery extends DatabaseQuery
{
    /**
     * The list of zero or null representation of a datetime.
     *
     * @var    array
     * @since  2.0.0
     */
    protected $nullDatetimeList = ['0000-00-00 00:00:00'];

    /**
     * Casts a value to a char.
     *
     * Ensure that the value is properly quoted before passing to the method.
     *
     * Usage:
     * $query->select($query->castAsChar('a'));
     * $query->select($query->castAsChar('a', 40));
     *
     * @param   string  $value  The value to cast as a char.
     * @param   string  $len    The length of the char.
     *
     * @return  string  Returns the cast value.
     *
     * @since   1.8.0
     */
    public function castAsChar($value, $len = null)
    {
        if (!$len) {
            return $value;
        } else {
            return 'CAST(' . $value . ' AS CHAR(' . $len . '))';
        }
    }
}