Pb envoie de donnée sur une base de donnée

<?php

class My_Sql {

// Requette de connecter Mysql	
	public function __construct($host, $user, $pass, $db) { 
		
		$this->connect = mysql_connect($host, $user, $pass);//connect prent
		if ($this->connect !== FALSE) {
			$this->db = mysql_select_db($db);
			if ($this->db === FALSE) {
					mysql_close ($this->connect);
					$this->connect = FALSE;
					die ('Impossible de se connecter a la base de donnée');
					
			}
			echo 'La connection est établie : OK';
		}
	} 
//Femre la connection.
	public function sql_close()
        {
        if ($this->connect !== FALSE)// Doit etre different de FALSE
            {
            $this->connect = mysql_close($this->connect);
            return $this->connect;
            }
        return TRUE;
        }
	
	public function sql_query($query,$fetch_array = FALSE)
        {
		$this->query = $query;
        if (!empty($this->query) AND $this->connect !== FALSE)
            {
            $this->result = mysql_query($this->query,$this->connect);
			$this->error = ($this->result === FALSE) ? TRUE : FALSE;
            if ($fetch_array AND !$this->error)
                {
                $this->result = mysql_fetch_array($this->result);
                $this->error = ($this->result === FALSE) ? TRUE : FALSE;
                }
            $this->result = ($this->error) ? $this->query."\n".mysql_errno($this->connect).' : '.mysql_error($this->connect) : $this->result;
            if ($this->error) die($this->result);
            return $this->result;
            }
        $this->error = TRUE;
        $this->result = 'La requète SQL est vide.';
        die($this->result);
        }
}

$a = new My_Sql(localhost, root, charlotte, minichat);
$a->sql_query("INSERT INTO ta_table VALUE ('', '$titre', 'lien')");

?>