Question

我有两张桌子，第一张名为＆＃39; posts＆＃39;第二个叫朋友＆＃39; 我希望得到它的发布者＆＃39;栏目存在于“朋友”中。表格（这意味着要获得朋友的帖子）比我想通过在＆＃39;帖子中找到的日期时间列来订购它表

我试过的是：

$fetch_fr_result = $conn->query("SELECT frid FROM friends WHERE username='$userusername'");
while ($fetch_fr_send = $fetch_fr_result->fetch(PDO::FETCH_OBJ)){
$fetch_fr_id = $fetch_fr_send->frid;

$fetch_fr_data_result = $conn->query("SELECT username FROM users WHERE id='$fetch_fr_id'");
$fetch_fr_data_send = $fetch_fr_data_result->fetch(PDO::FETCH_OBJ);
$fetch_fr_data_username = $fetch_fr_data_send->username;

$fetch_posts_result = $conn->query("SELECT * FROM posts WHERE publisher='$fetch_fr_data_username' ORDER BY orderdate DESC LIMIT 5");

while ($fetch_posts_send = $fetch_posts_result->fetch(PDO::FETCH_OBJ)){
$fetch_posts_msg = $fetch_posts_send->thetext;
$fetch_posts_time = $fetch_posts_send->time;
if (!empty($fetch_posts_msg)){
echo '<div class="posttext">' . $fetch_posts_msg . '</div> - ' . $fetch_posts_time;
}
}
}

此代码中的问题是：然后让每个朋友获得朋友的帖子，然后按时间排序，但我想按时间点好所有朋友的帖子！

告诉我该怎么做？

Answer 1

也许我误解了你的问题，但这可能会给你你想要的东西。如果没有告诉我什么是错的，我会尽力解决。

$fetch_result = $conn->query('
    SELECT 
        `p`.thetext,
        `p`.time
    FROM 
        `friends` as f,
        `users` as u,
        `posts` as p
    WHERE 
        `f`.frid = `u`.id /* join friends id with users table */
    AND 
        `p`.publisher = `u`.username /* join friends username with posts table */
    AND 
        `f`.username = "' . $userusername . '" 
    ORDER BY 
        `p`.orderdate DESC
');

我建议你在其他表中使用userid作为外键，而不是用户名。您应该更改数据类型以使用更适合的东西。表中的varchar（1000）太多了。

获取用户朋友的帖子，并按照colomns的日期时间进行排序

1 个答案: