我如何以相反的顺序显示mySql数据
[英]How do i show mySql data in inverse order
问题描述
Update: thanks for the help everyone, the entire code is on the bottom of the text, with brazilian-portuguese comentary. 
更新：谢谢大家的帮助，整个代码位于文本的底部，巴西-葡萄牙语互为注释。
How exactly do I show the information I have in my tables (using PHP) in reverse order? 如何准确地以相反的顺序显示表中的信息（使用PHP）？
For example lets say I have a table with an AUTO_INCREMENT id column as primary key and a name column: 例如，假设我有一个表，该表具有一个AUTO_INCREMENT id列作为主键和一个name列：
id: 1 Name: Cris
id: 2 Name: Elen
id: 3 Name: Bob
id: 4 Name: Lian
I need to show it in the page like this: 我需要在这样的页面中显示它：
id: 4 Name: Lian
id: 3 Name: Bob
id: 2 Name: Elen
id: 1 Name: Cris
This code only shows them in normal order, so far it works but it isn't exactly what i need. 这段代码仅以正常顺序显示它们，到目前为止，它仍然有效，但这并不是我真正需要的。
PS: I used $result and $rows to count how many rows I had and tried to use it in the for function but it didn't work. PS：我使用$result和$rows来计数我有多少行，并尝试在for函数中使用它，但是它没有用。
<?php
$conect = mysql_connect("localhost", "root", "") or die(mysql_error());
mysql_select_db("Noticias", $conect) or die(mysql_error());
$result = mysql_query("SELECT * FROM titulos", $conect);
$totalrows = mysql_num_rows($result);
echo "$totalrows Rows test edit<br>";
while($row = mysql_fetch_array($result)) {
echo $row['Titulo'];
echo "<br>";
}
for($i=$totalrows;$i>=0;$i-1){
$_Str ="SELECT Titulo FROM titulos WHERE id_Noticia=".$i."";
$show = mysql_query($_Str, $conect);
echo $show['Titulo']."<br>";
}
?>
Ok, you guys solved my problem so it's only fair to show what i was trying to do. 好的，你们解决了我的问题，所以很公平地表明我正在尝试做的事情。
I was trying to get the reverse order because i was wanted to create(as an exercise) a page that saves a blog title and its content. 我试图获得相反的顺序，因为我想创建（作为练习）保存博客标题及其内容的页面。
i needed it to show the blog posts in reverse order so the user can see them from newest to oldest. 我需要它以相反的顺序显示博客文章，以便用户可以查看最新到最旧的文章。
i also had to make every blog title to be used as a link to the blog post(right now it only gives a reference to the exacly same link, i'm working on it) 我还必须使每个博客标题都可以用作指向博客文章的链接（现在，它仅提供了对完全相同的链接的引用，我正在研究中）
it also has a bit of HTML just to create a area where the posts links will be shown, it shows a max of 12 blog links(3 posts in the same line, then it jumps to the next line) and if a blog post is too big(more than 90px) it covers the rest of the link (title) with dots. 它也有一点HTML，只是用于创建一个显示帖子链接的区域，它最多显示12个博客链接（同一行中有3个帖子，然后跳至下一行），如果博客帖子为太大（超过90像素）时，它会用点覆盖链接（标题）的其余部分。
again, sorry for bad english, i'm out of practice. 再次，对不起，英语不好，我没有锻炼。
<?php
//coneção com o banco de dados onde os dados das nopticias estão salvos
$conect = mysql_connect("localhost", "root", "") or die(mysql_error());
mysql_select_db("Noticias", $conect) or die(mysql_error());
//Calcula quantas noticias existem salvas no banco de dados, pdoe ser usado
//quando o usuario quiser ver todas as noticias
$result = mysql_query("SELECT * FROM titulos", $conect);
$totalrows = mysql_num_rows($result);
//ordena as noticias em ordem decrecente(da mais nova para a mais velha)
//e salva em um array
$result2 = mysql_query("SELECT * FROM titulos ORDER BY id_Noticia DESC", $conect);
$lista = array();
while($row= mysql_fetch_array($result2)) {
$lista[].=$row['Titulo'];
}
//variaveis para manipular quantas noticias aparecerão
$a=0;
$b=0;
?>
<html>
<head>
<title>Painel de Noticias!!!</title>
<style>
//cria a area onde os titulos aparecerão
.boxed {
border: 2px solid green ;
width: 300px;
}
//encobre com pontos qualquer parte do titulo que ultrapasse mais de 90 pixels
.espaco90 {
width: 90px;
float: left;
overflow: hidden;
text-overflow: ellipsis;
white-space: nowrap;
}
</style>
</head>
<body>
<div class="boxed" >
<p>
<?php
//seleciona os titulos e aplica um link para eles, aqui falta um meio de determinar os links para cada
//titulo existente no banco de dados, más como isso
//será usado em conjunto com o wolrd press então eu creio
//que não seja necessário aha não ser que você queira
for($i=0;$i<=$totalrows-1;$i++){
echo "<div class='espaco90'><a href='http://www.w3schools.com'>".$lista[$i]."</a></div></p><p>";
$a=$a+1;
$b=$b+1;
if($b<12){
if($a>=3){
echo "<br>";
$a=$a-3;
}
}else{
echo"<br>";
break;
}
}
?> </p>
</div>
</body>
</html>
4 个解决方案
解决方案1
1 2014-07-15 14:38:49
This should get items in reverse order 这应该使项目以相反的顺序
$_Str ="SELECT Titulo FROM titulos WHERE ORDER BY id_Noticia DESC ";
$show = mysql_query($_Str, $conect);
for($i=0; $i<$totalrows; $i+1) {
echo $show[i]['Titulo']."<br>";
}
解决方案2
0 2014-07-15 14:41:13
解决方案3
0 2014-07-15 14:42:21
You can use array_reverse() function after getting your data to your data structure. 将数据放入数据结构后，可以使用array_reverse（）函数。 Here is an implementation of array_reverse function: 这是array_reverse函数的实现：
<?php
$a=array("a"=>"Volvo","b"=>"BMW","c"=>"Toyota");
print_r(array_reverse($a));
?>
For more info visit the link: http://www.w3schools.com/php/func_array_reverse.asp 有关更多信息，请访问链接： http : //www.w3schools.com/php/func_array_reverse.asp
解决方案4
0 已采纳 2014-07-15 15:28:48
Just add an ORDER BY clause to your query. 只需在查询中添加ORDER BY子句即可。
SELECT * FROM titulos ORDER BY id_Noticia DESC
^^^^^^^^^^^^^^^^^^^^^^^^
MySQL will return the rows in the specified sequence. MySQL将按指定的顺序返回行。 (The DESC keyword indicates that the rows are to be returned in descending order, with the highest values first.) （ DESC关键字指示将以降序返回行，最高值在前。）
Get rid of for loop and it's contents. 摆脱for循环及其内容。 The while ( fetch ) is the right pattern. while ( fetch )是正确的模式。
NOTE: PHP mysql_ interface is deprecated. 注意：不建议使用PHP mysql_接口。 New development should be using either PDO or mysqli interface. 新开发应使用PDO或mysqli接口。
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