MysqlDateSql.php

<?php

namespace Drupal\views\Plugin\views\query;

use Drupal\Core\Database\Connection;

/**
 * MySQL-specific date handling.
 *
 * @internal
 *   This class should only be used by the Views SQL query plugin.
 *
 * @see \Drupal\views\Plugin\views\query\Sql
 */
class MysqlDateSql implements DateSqlInterface {
    
    /**
     * The database connection.
     *
     * @var \Drupal\Core\Database\Connection
     */
    protected $database;
    
    /**
     * An array of PHP-to-MySQL replacement patterns.
     */
    protected static $replace = [
        'Y' => '%Y',
        'y' => '%y',
        'M' => '%b',
        'm' => '%m',
        'n' => '%c',
        'F' => '%M',
        'D' => '%a',
        'd' => '%d',
        'l' => '%W',
        'j' => '%e',
        'W' => '%v',
        'H' => '%H',
        'h' => '%h',
        'i' => '%i',
        's' => '%s',
        'A' => '%p',
    ];
    
    /**
     * Constructs the MySQL-specific date sql class.
     *
     * @param \Drupal\Core\Database\Connection $database
     *   The database connection.
     */
    public function __construct(Connection $database) {
        $this->database = $database;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getDateField($field, $string_date) {
        if ($string_date) {
            return $field;
        }
        // Base date field storage is timestamp, so the date to be returned here is
        // epoch + stored value (seconds from epoch).
        return "DATE_ADD('19700101', INTERVAL {$field} SECOND)";
    }
    
    /**
     * {@inheritdoc}
     */
    public function getDateFormat($field, $format) {
        $format = strtr($format, static::$replace);
        return "DATE_FORMAT({$field}, '{$format}')";
    }
    
    /**
     * {@inheritdoc}
     */
    public function setTimezoneOffset($offset) {
        $this->database
            ->query("SET @@session.time_zone = '{$offset}'");
    }
    
    /**
     * {@inheritdoc}
     */
    public function setFieldTimezoneOffset(&$field, $offset) {
        if (!empty($offset)) {
            $field = "({$field} + INTERVAL {$offset} SECOND)";
        }
    }

}