Question

我完全被困在这里，提前感谢任何解决方案或指示，我真的非常感谢您提供的任何帮助。

我正在尝试制作备忘录系统。显示备忘录是没问题的，但我试图只显示未读的备忘录。你可以看到我有2个表，一个有备忘录，另一个列出了阅读备忘录。当用户阅读备忘录时，他/她勾选该框，并将备忘录ID和用户ID添加到表'memo_read'中。

所以基本上我试图检索从'memo_read'表中读取的备忘录，然后显示'memo'表中未读取user_id和公司正确的结果。正如你所看到的，我在另一个页面上有一个函数的2个变量，这些变量正常工作'$ user_id，$ company_id'，

我试图在显示所需变量的while循环中显示未读的备忘录。我一直在研究这个问题多年没有快乐，我已经尝试了我能想到的每一种方法，但我相信你可以说我不是最有经验的人，我确信我错过了一些东西或有采取了完全错误的方法！

<?php
$user_id = $user_data['user_id'] ;
$company_id = $user_data['company'];

$result1 = mysql_query ("SELECT `user`, `memo_id` FROM`memo_read` WHERE `user`= '$user_id '") or die(mysql_error());
while($row = mysql_fetch_array($result1)){
$memo_id   = $row['memo_id']; 


$result = mysql_query ("SELECT `id`, `link`, `author`, `time`, `title`, `company` FROM `memo` WHERE `worker`= 1 AND `company`= '$company_id' AND `id`!= '$memo_id'") or die(mysql_error());
while($row = mysql_fetch_array($result))    {

    $id           = $row['id']; 
    $link         = $row['link'];
    $author     = $row['author'];
    $time        = $row['time'];
    $title         = $row['title'];
    $company  = $row['company'];

?>

<ul>
    <li><?php  echo $title; ?></li>
    <li><?php echo $author; ?></li>
    <li><?php echo $company;?></li>
    <li><?php echo $time;?></li>
    <a href="<?php  echo $link; ?>"> Read memo</a> 
</ul><br>
<?php
}   }
?>

Answer 1

为什么不使用返回未读备忘录的查询？类似的东西：

 SELECT `id`, 
        `link`, 
        `author`, 
        `time`, 
        `title`, 
        `company` 
   FROM `memo` 
  WHERE `worker`= 1 
    AND `company`= '$company_id' 
    AND `id` NOT IN (SELECT `memo_id` 
                       FROM `memo_read` 
                      WHERE `user`= '$user_id '
                    )

Answer 2

试试这个：

<?php
$user_id = $user_data['user_id'] ;
$company_id = $user_data['company'];

$result1 = mysql_query ("SELECT `user`, `memo_id` FROM`memo_read` WHERE `user`= '$user_id '") or die(mysql_error());
$memo_id_query = '';
while($row = mysql_fetch_array($result1)){
$memo_id_query .= " AND `id`!= '".$row['memo_id']."'";
}


$result = mysql_query ("SELECT `id`, `link`, `author`, `time`, `title`, `company` FROM `memo` WHERE `worker`= 1 AND `company`= '$company_id' ".$memo_id_query) or die(mysql_error());
while($row = mysql_fetch_array($result))    {

    $id           = $row['id']; 
    $link         = $row['link'];
    $author     = $row['author'];
    $time        = $row['time'];
    $title         = $row['title'];
    $company  = $row['company'];

?>

<ul>
    <li><?php  echo $title; ?></li>
    <li><?php echo $author; ?></li>
    <li><?php echo $company;?></li>
    <li><?php echo $time;?></li>
    <a href="<?php  echo $link; ?>"> Read memo</a> 
</ul><br>
<?php
}
?>

mysql_query导致while循环X 2

2 个答案: