PHP实现数据库分表的方法

$tableName = 'order_'.date('Ym');
$sql = 'CREATE TABLE `'.$tableName.'` (
      `id` int(11) unsigned NOT NULL AUTO_INCREMENT PRIMARY KEY,
      `order_no` varchar(20) NOT NULL,
      `user_id` int(11) unsigned NOT NULL,
      `status` tinyint(1) NOT NULL DEFAULT '0',
      `create_time` int(11) unsigned NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8';

$time = time();
$tableName = 'order_'.date('Ym', $time);
$sql = 'INSERT INTO `'.$tableName.'` (`order_no`, `user_id`, `status`, `create_time`) VALUES (?, ?, ?, ?)';

$params = ['20210001', 1, 1, $time];
DB::getInstance()->execute($sql, $params);

$tableName = 'order_'.date('Ym', $time);
$sql = "SELECT * FROM `$tableName` WHERE `user_id` = ?";
$params = [1];
$result = DB::getInstance()->query($sql, $params);

for ($i=1; $i<6; $i++) {
    $dt = strtotime("-$i month");
    $tableName = 'order_'.date('Ym', $dt);

    if (!existTable($tableName)) {
        $replaceSql = "REPLACE INTO `$tableName` (`order_no`, `user_id`, `status`, `create_time`) VALUES (?, ?, ?, ?)";
        $params = [
            ['20210001', 2, 1, $dt],
            ['20210002', 2, 1, $dt],
            ['20210003', 3, 1, $dt],
            ['20210004', 2, 1, $dt],
        ];

        foreach ($params as $item) {
            DB::getInstance()->execute($replaceSql, $item);
        }
    }
}