问如何包装PDO类？

EN

class aegis{
    private $init, $dsn, $user, $pass;
    private $options = [
        PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
        PDO::ATTR_CASE => PDO::CASE_NATURAL,
        PDO::ATTR_ORACLE_NULLS => PDO::NULL_EMPTY_STRING  
    ];
    private $error = [];

    public function __construct($host, $port, $db_name, $user, $pass){
        $this->dsn = 'mysql:host='.$host.';port='.$port.';dbname='.$db_name;
        $this->user = $user;
        $this->pass = $pass;
        $this->connect();
    }

    private function connect(){
        try{
            $this->init = new PDO($this->dsn, $this->user, $this->pass, $this->options);
        }catch(PDOException $e){
            if(isset($e)){
                array_push($this->error, $e->getCode());
                array_push($this->error, $e->getMessage());
                array_push($this->error, time());
            }
        }
    }

    public function query($sqlStatement){
        if(isset($this->init)){
            try{
                $this->init->query($sqlStatement);
            }catch(PDOException $e){
                if(isset($e)){
                    array_push($this->error, $e->getCode());
                    array_push($this->error, $e->getMessage());
                    array_push($this->error, time());
                }else{
                   return $this->init->query($sqlStatement);
                }
            }
        }
    }

    public function close(){
        $this->init = NULL;
    }

    public function logError(){
        return $this->error;
    }
}

$aegis = new aegis($host, $port, $db_name, $user, $pass);

$rows = $aegis->query("SELECT `market` FROM `result`")->fetchAll();

foreach($rows as $row){
    echo $row.'<br>';
}