Написал класс для работы с БД, скажите все ли верно я сделал, и надо что то поменять?

class DataBase
{
    private $db_host = "localhost";
    private $db_name = "uscriptmaker";
    private $db_user = "root";
    private $db_pass = "";
    public  $message;
    private $numResults;
    public $result;
    
    public function format($val)
    {
        $this->connect();
        if(is_array($val))
        {
            foreach ($val as $column => $values)
            {
                $val[$column] = mysql_real_escape_string("$val[$column]");
            }
            return $val;
        }
        else return $val = mysql_real_escape_string("$val");
    }
    
    public function connect()
    {
        $connect = mysql_connect($this->db_host,$this->db_user,$this->db_pass);
        $select_db = mysql_select_db($this->db_name);
        @mysql_query("SET NAMES CP1251");
        if($connect && $select_db) return true; else return false;
    }
    public function select_result($table,$rows = '*',$where)
    {
        if($this->connect())
        {
            $select = "SELECT $rows FROM $table WHERE $where";
            $sql = mysql_query($select);
            $sql = @mysql_query($select);
            if($sql)
            {
                $row = mysql_fetch_assoc($sql);
                if(empty($row)) return false; else return true;
                }else return false;
                }
        }
        
    public function insert($table,$values)
    {
        if($this->connect())
        {
            if(is_array($values)) $columns = implode(",",array_keys($values));
            $values = implode("','",$this->format($values));
            $ins = @mysql_query("INSERT INTO $table($columns) VALUES('$values')");
            if($ins) return true; else return false; 
        } else return false;
    }
    public function delete($table,$where = null)
    {
        if($this->connect())
        {
            $delete = "DELETE FROM $table ";
            if(is_array($where)) $where = implode(",",$where);
            if($where != null) $delete .= "WHERE $where";
            $sql_del = @mysql_query($delete);
            if($sql_del) return true; else return false;
            
        }
        else return false;
    }
    public function update($table,$sets,$where)
    {
        if($this->connect())
        {
            $sets = implode(",",$sets);
            $where = implode(",",$where);
            if(is_array($sets))
            $update = mysql_query("UPDATE $table SET $sets WHERE $where");
            if($update) return true; else return false;
            
        }
        else return false;
    }
    public function select($table,$rows = null,$where = null,$order = null)
    {
        if($this->connect())
        {
        $select = "SELECT ";
        if(is_array($rows)) $rows = implode(",",$rows);
        if($rows != null) $select .= "$rows "; else $select .= "* ";
        $select .= "FROM $table ";
        if($where != null) $select .= "WHERE $where ";
        if($order != null) $select .= "ORDER BY $order";
        $sql = @mysql_query($select);
        if($sql)
        {
        $this->result = mysql_fetch_assoc($sql);
        return true;
        }
        else return false;
    }
    else false;
    }
    }