wordpress新建一张数据表的代码和步骤

function uctheme_taobao_collect(){
    global $wpdb;
    $table_name = $wpdb->prefix . 'taobao_collect';
    if( $wpdb->get_var("SHOW TABLES LIKE '$table_name'") != $table_name ) :
        $sql = "CREATE TABLE `$table_name` (
			    id INT NOT NULL AUTO_INCREMENT,
			    time datetime NOT NULL DEFAULT '0000-00-00 00:00:00',
			    taobao_id VARCHAR(255),
                unique taobao_id (taobao_id),
                PRIMARY KEY (id)  
		) ENGINE = MyISAM CHARSET=utf8;";
        require_once(ABSPATH . 'wp-admin/includes/upgrade.php');
        dbDelta($sql);
    endif;
}
add_action( 'admin_menu', 'uctheme_taobao_collect');