实例如下：
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));
}
else
{
return $r;
}
}
}
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