ci mysql判断表是否存在

<?php
defined('BASEPATH') OR exit('No direct script access allowed');

class Database_check extends CI_Controller {

    public function __construct() {
        parent::__construct();
        $this->load->database();
    }

    public function table_exists($table_name) {
        $query = $this->db->query("SHOW TABLES LIKE '$table_name'");
        if ($query->num_rows() > 0) {
            return TRUE;
        } else {
            return FALSE;
        }
    }

    public function check_table() {
        $table_name = 'your_table_name';
        if ($this->table_exists($table_name)) {
            echo "Table '$table_name' exists.";
        } else {
            echo "Table '$table_name' does not exist.";
        }
    }
}