Question

我在PHP页面中显示了一个MYSQL数据库，按照＃34; Seat＆＃34;。

列排序。

如果用户点击＆＃34;按名称排序＆＃34;我希望如此链接，表现在按此列命令。

<?php
include "connect.php";

$resulted = mysqli_query($con, "SELECT * FROM guests ORDER BY case WHEN Seat = '' THEN 2 ELSE 1 END, Seat");

if (isset($_GET['Name'])) {$resulted = mysqli_query($con, "SELECT * FROM guests ORDER BY case WHEN Name = '' THEN 2 ELSE 1 END, Name");}
?>

<a href='?Name=true'>Order By Name</a>

当用户点击该链接时，该表确实按名称排序，但由于某些奇怪的原因，它会逐步输入ORDER BY CASE语句。

为什么？

Answer 1

而不是检查Seat = ''尝试检查IS NULL

case WHEN Seat IS NULL THEN 2 ELSE 1 END

（OR）

case WHEN Seat IS NULL OR Seat = '' THEN 2 ELSE 1 END

ORDER BY CASE不使用php GET

1 个答案: