connect, retrieve, insert, disconnect class

<?php
//created by me...
 
class apple {
    // connect to, and select the database
    private function connectDB(){
    $dbconnect = mysql_connect('localhost', 'root','', 'form')
    or die('no connection');
    mysql_select_db("form");
    echo 'connected';
    }
 
    // get table names
    function gettables(){
        $this->connectDB();
        $query = 'SHOW TABLES from form';
        $result = mysql_query($query);
        $num_rows = mysql_num_rows($result);
        for ($i = 0; $i < $num_rows; $i++) {
           echo "<p>Table: ", mysql_tablename($result, $i), "</p>\n";
    }
}
 
    // list articles
    function goober() {
        $this->connectDB();
        $result = mysql_query("SELECT * FROM article");
        while ($row = mysql_fetch_array($result, MYSQL_BOTH)) {
            print("<h2>".$row['title']."</h2>");
            print($row["content"]."<br />");
          }
    }
 
    // insert article
    function insertArticle(){
        $sql = mysql_query("INSERT INTO article (title, content) VALUES('class1', 'tree1')")
        or die;
    }
 
    // disconnect
    function disconnectDB(){
        mysql_close();
    }
}
 
$art= new apple(); // instantiate the class
$art->goober(); //retrieves articles and displays them
//$art->insertArticle();
$art->disconnectDB();
 
?>