[英]i have difficulties with the sql part
我在下面发布了有关我的网站的代码。 在此代码中,如果用户更改了网站表单上主题的名称,我想更新数据库中的行。 除了sql部分,其他所有东西都在工作。 我指的是其中的部分:“ LIMIT 1 OFFSET'$ x'”由于某些原因,sql代码的这一部分不好,但是我不知道为什么。 我在xampp phpmyadmin中对其进行了测试,并且可以正常工作,但是这里有些错误。
<?php
$sql = "SELECT topicname, username, created, COUNT(commentid)
FROM user, topic, comment
WHERE topic.topicid = comment.whichtopic
AND user.userid = topic.owner
AND user.username = '" . $_SESSION['user_name '] . "'
GROUP BY topicname ";
$lekerdezes = mysql_query($sql);
$num_rows = mysql_num_rows($lekerdezes); ?>
<?php
if (isset($_POST['delete']))
{
if (!empty($_POST['forumnev']))
{
for ($x = 0; $x < $num_rows; $x++)
{
foreach ($_POST['forumnev'] as $selected)
{
$seged = mysql_query("SELECT created FROM topic WHERE
created IN (SELECT created FROM user, topic, comment WHERE topic.topicid = comment.whichtopic
AND user.userid = topic.owner AND user.username = '" . $_SESSION['user_name '] . "'
GROUP BY topicname ORDER BY created)
LIMIT 1 OFFSET '$x'");
if (!$seged)
{
echo mysql_error();
}
$seged2 = mysql_fetch_array($seged);
$seged2 = $seged2[0];
if (!$seged2)
{
echo mysql_error();
}
$sql = mysql_query("UPDATE topic SET topicname = '$selected' WHERE created = '$seged2'");
}
}
header("Location: topicedit.php");
}
}
?>
尝试如下更新:(希望您的限制:1,偏移量:$ x)
$seged = mysql_query("SELECT created FROM topic WHERE created IN (SELECT created
FROM user,topic,comment
WHERE topic.topicid = comment.whichtopic
AND user.userid = topic.owner
AND user.username = '". $_SESSION['user_name'] ."'
GROUP BY topicname
ORDER BY created)
LIMIT $x, 1");
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