使用PHP显示从MySQL数据库检索到的数据时出现问题

Question

I'm very new to PHP; 我是PHP的新手。 and am doing a few sample projects to help me learn, this project was done for fun. 并且正在做一些示例项目来帮助我学习，这个项目的完成很有趣。 There's probably some idiotic and highly unintelligibly created code in here. 这里可能有一些愚蠢且难以理解的代码。 Considering I'm a newbie, there's probably a syntax error but I've been searching for hours without any luck. 考虑到我是新手，可能存在语法错误，但是我一直在寻找没有运气的小时。

Basically I'm making a extremely simple comment/shoutbox system in which the user who posts the data is kept anonymous. 基本上，我正在制作一个非常简单的注释/聊天框系统，在其中发布数据的用户保持匿名。 I'm doing things separate at the moment; 我现在正在分开做事； then I plan on combining them into one. 然后我计划将它们合并为一个。 I know that the submitting part is working correctly as I've checked the MySQL database via PHPMyAdmin, however I can't seem to get the data to display right. 我知道提交部分可以正常工作，因为我已经通过PHPMyAdmin检查了MySQL数据库，但是我似乎无法正确显示数据。 I've searched for over 2 hours for my simple syntax mistake, and have given up deciding to bring it to a reliable and friendly community. 我已经搜索了两个多小时的简单语法错误，并放弃了将其引入可靠和友好的社区的决定。

I've removed all of the connection information to my database, as I know all of this is correct and I'd rather not expose it on a public 'forum'. 我已将所有连接信息删除到数据库中，因为我知道所有这些信息都是正确的，因此我不希望将其公开显示在公共“论坛”上。

<html>
<body>
<?php
$username="";
$password="";
$database="";

mysql_connect("localhost",$username,$password);
mysql_select_db($database) or die( "Unable to select database");
$query="SELECT * FROM data";
$result=mysql_query($query);

$num=mysql_numrows($result);

mysql_close();
?>
<table border="2" cellspacing="2" cellpadding="2">
<tr>
<th><font face="Arial, Helvetica, sans-serif">Name(No specific order)</font></th>
</tr>

<?php
$i=0;
while ($i < $num) {

$    name=mysql_result($result,$i,"");
?>

<tr>
<td><font face="Arial, Helvetica, sans-serif"><?php echo $name; ?></font></td>
</tr>

<?php
$i++;
}
?>
</body>
</html>

I have two tables, id and name. 我有两个表，ID和名称。 ID is a automatic increment INT, and name is set up a text. ID是一个自动递增的INT，而名称则是一个文本设置。 ID is also the primary of the database. ID也是数据库的主要对象。 The submitting system is working perfectly fine, however the displaying isn't. 提交系统运行正常，但显示效果不佳。

When I view the page, where there should be text($name), instead I get a blank area, and no text. 当我查看页面时，应该有text（$ name），而我得到的是空白区域，没有文本。 This is what I received when I visited the page, with only one database entry: 这是我访问该页面时收到的，只有一个数据库条目：

<html>

<body>

<table border="2" cellspacing="2" cellpadding="2">

<tr>

<th><font face="Arial, Helvetica, sans-serif">Name(No specific order)</font></th>

</tr>





<tr>

<td><font face="Arial, Helvetica, sans-serif"></font></td>

</tr>



</body>

</html>

Any help would be appreciated, thanks. 任何帮助，将不胜感激，谢谢。

Answer 1

I would recommend not using the older mysql_*() functions. 我建议不要使用较早的mysql _ *（）函数。 You could do something like this instead (via PDO_mysql extension): 您可以改为执行以下操作（通过PDO_mysql扩展）：

<?php
    $pdo = new PDO('mysql:host=localhost;dbname=YOURDBNAME', $username, $password);
    $query = "SELECT * FROM data";
    $stmt = $pdo->prepare($query);
    $stmt->execute(array());
    $results = $stmt->fetchAll(PDO::FETCH_ASSOC);

Then later, you would loop through with something like: 然后，您将使用以下内容循环遍历：

    foreach ($results as $res) {
        echo $res['column_name'];
    }

Answer 2

Something is wrong in while loop where you trying to display names. 在while loop中尝试显示名称的地方出了点问题。

Replace with below : 替换为以下内容：

 <?php
    if($num >0) {
       while ($row=mysql_fetch_assoc($result)) {
         ?>
        <tr>
           <td><font face="Arial, Helvetica, sans-serif"><?php echo $row['name']; ?></font></td>
        </tr>
        <?php

        }
      }
  ?>

change : 变化：

$num=mysql_numrows($result);

to 至

$num=mysql_num_rows($result);

Answer 3

You have the query result from MySQL but you're not looping through it properly. 您有来自MySQL的查询结果，但没有正确遍历它。 Try: 尝试：

$result=mysql_query($query);
if(mysql_num_rows($result) > 0)
{
    while ($row = mysql_fetch_assoc($result))
    {
        // print data
    }
}

使用PHP显示从MySQL数据库检索到的数据时出现问题

问题描述

3 个解决方案

解决方案1
3 2012-03-22 05:14:45

解决方案2
2 已采纳

解决方案3
1 2012-03-22 05:15:48

使用PHP显示从MySQL数据库检索到的数据时出现问题

问题描述

3 个解决方案

解决方案1 3 2012-03-22 05:14:45

解决方案2 2 已采纳

解决方案3 1 2012-03-22 05:15:48

解决方案1
3 2012-03-22 05:14:45

解决方案2
2 已采纳

解决方案3
1 2012-03-22 05:15:48