使用ORDER BY id DESC和where

Question

如何使用正确的代码来使用ORDER BY id DESC and WHERE

$sel = "SELECT * FROM items where portfolio_id=".$_GET['folio_id']."ORDER BY id DESC";

Answer 1

如图所示在此处添加空格。

$sel = "SELECT * FROM items where portfolio_id=".$_GET['folio_id']." ORDER BY id DESC";
                                                                ----^

另外，不要将$_GET或$_POST之类的参数直接传递给SQL查询，因为它肯定会导致SQL注入攻击。过滤这些参数或使用 Prepared Statements 。

Answer 2

至少在'ORDER'之前添加一个空格

 $sel = "SELECT * FROM items where portfolio_id=".$_GET['folio_id']." ORDER BY id DESC";

Answer 3

您需要在ORDER BY

之前提供空间

$sel = "SELECT * FROM items where portfolio_id=".$_GET['folio_id']." ORDER BY id DESC";

Answer 4

只需使用：

$sel = "SELECT * FROM items where portfolio_id ='$_GET[folio_id]' ORDER BY id DESC";