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    <?php
    class DBDA
    {
      public $host="localhost";
      public $uid = "root";
      public $pwd = "123";
      public $dbname = "mydb";

      //³ÉÔ±*½*¨
      public function Query($sql,$type=1)
      {
        $db = new MySQLi($this->host,$this->uid,$this->pwd,$this->dbname);
        $r = $db->query($sql);

        if($type==1)
        {
          return $r->fetch_all();
        }
        else
        {
          return $r;
        }
      }

      //*µ»Ø×Ö*u´®µÄ*½*¨
      public function StrQuery($sql,$type=1)
      {
        $db = new MySQLi($this->host,$this->uid,$this->pwd,$this->dbname);
        $r = $db->query($sql);

        if($type==1)
        {
          $attr = $r->fetch_all();
          $str = "";
          foreach($attr as $v)
          {
            $str .= implode("^",$v)."|";
          }

          return substr($str,0,strlen($str)-1);

        }
        else
        {
          return $r;
        }
      }

      //*µ»ØJSON
      function JSONQuery($sql,$type=1)
      {
        $db = new MySQLi($this->host,$this->uid,$this->pwd,$this->dbname);
        $r = $db->query($sql);

        if($type==1)
        {
          return json_encode($r->fetch_all(MYSQLI_ASSOC));
        }
        else
        {
          return $r;
        }
      }
    }

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