phpcms 栏目没了

<?php
// 数据库连接配置
$db_host = 'localhost';
$db_user = 'username';
$db_pass = 'password';
$db_name = 'phpcms';

// 尝试连接数据库
$conn = mysqli_connect($db_host, $db_user, $db_pass, $db_name);

if (!$conn) {
    die('数据库连接失败: ' . mysqli_connect_error());
} else {
    echo '数据库连接成功';
}

// 检查数据表
$sql = "SHOW TABLES LIKE 'v9_category'";
$result = mysqli_query($conn, $sql);

if (mysqli_num_rows($result) > 0) {
    echo '数据表存在';
} else {
    echo '数据表不存在，尝试重建数据表';
    // 重建数据表的 SQL 语句
    $create_table_sql = "CREATE TABLE `v9_category` (
        `catid` smallint(5) unsigned NOT NULL AUTO_INCREMENT,
        `catname` varchar(30) NOT NULL DEFAULT '',
        PRIMARY KEY (`catid`)
    ) ENGINE=MyISAM DEFAULT CHARSET=utf8";
    mysqli_query($conn, $create_table_sql);
}

mysqli_close($conn);
?>