host,$this->uid,$this->pwd,$this->dbname);		$r = $db->query($sql);				if ($type==1)		{			return $r->fetch_all();			}				else		{			return $r;		}	}	//返回字符串的方法 	public function StrQuery($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 $r;		}	}			//返回JSON	function JSONQuery($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));//返回关联数组  fet_all 慎用 放在服务器上有问题 要求配置		}				else		{			return $r;		}	}			}